New Study Investigates the Utility of Masimo ORi™, Oxygen Reserve Index, As an Indicator to Avoid Hyperoxia During General Anesthesia

Neuchatel, Switzerland – July 15, 2019 – Masimo (NASDAQ: MASI) announced today that in a study recently published in the Journal of Clinical Monitoring and Computing, researchers investigated the ability of Masimo ORi™ (Oxygen Reserve Index) to serve as a noninvasive indicator of the arterial partial pressure of oxygen (PaO₂) during general anesthesia, to help avoid hyperoxia.1 ORi is an index of oxygenation in the moderate hyperoxic region (PaO₂ range of 100 to 200 mmHg). As an "index" with a scale between 0.0 and 1.0, ORi can be trended to notify clinicians of changes in a patient's oxygen reserve.

Dr. Keisuke Yoshida and colleagues at the Fukushima Medical University School of Medicine in Japan sought to evaluate whether ORi could provide continuous, noninvasive insight into avoiding excessive hyperoxia by comparing the relationship between PaO₂ and ORi during various oxygen administration conditions. They enrolled 20 patients scheduled for surgery requiring general anesthesia. ORi was measured using Masimo Root® with the Radical-7^® Pulse CO-Oximeter^® and rainbow^® sensors. PaO₂ was measured using the Siemens RAPIDLab^® 1265 blood gas analyzer. For each patient, after inducing anesthesia, blood gas analysis to measure PaO₂ was performed four times, with ORi values recorded each time blood was drawn, providing 80 data sets. Initial analysis was performed with inspired oxygen concentration (FiO2) set to 0.33, with the three subsequent analyses performed when ORi was around 0.5, 0.2, and 0, achieved by adjusting FiO₂.

For analysis, the researchers chose an upper PaO₂ threshold of 240 mmHg, based on a previous study that found a positive correlation between ORi and PaO₂ when PaO₂ < 240 mmHg.² They defined hyperoxemia as PaO₂ ≥ 150 mmHg. Using linear regression analysis, the researchers found a "relatively strong" positive correlation (r2 = 0.706) between ORi and PaO₂ when PaO₂ was less than 240 mmHg. Using receiver operating characteristic (ROC) curve analysis, they calculated that the optimal cut-off ORi value to detect PaO₂ ≥ 150 mmHg was 0.21 (sensitivity 0.950, specificity 0.755). Using four-quadrant plot analysis, they found that ORi trended PaO₂ with a 100% concordance rate.

The researchers concluded that "Hyperoxemia can be detected by observing ORi of patients under general anesthesia, and thus unnecessary administration of high concentration oxygen can possibly be avoided." They also noted, "ORi has unique characteristics reflecting the state of oxygenation in the hyperoxic range. The present study examined data under general anesthesia in the operating room, but ORi's unique features can provide benefits not only in the operating room, but also in the ICU and other fields. In the future, in order to make the most use of ORi, further clinical study is required."

As study limitations, the researchers noted the small number of subjects in the study. In addition, they noted, "It is plausible that a given patient's factors (e.g. age, physique, body temperature, finger perfusion, hemoglobin concentration) affect their ORi value. Therefore, ORi might not reflect all changes in PaO₂."

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.² Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,³ improve CCHD screening in newborns,⁴ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response team activations, ICU transfers, and costs.^5-7 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^® and Radius™ PPG, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi and RPVi have not received FDA 510(k) clearance and are not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Yuan I, Landis W, Topjian A, Abend N, Lang S, Huh J, Kirschen M, Mensinger J, Zhang B, and Kurth C. Prevalence of Isoelectric Electroencephalography Events in Infants and Young Children Undergoing General Anesthesia. Anesth Analg. 2019. DOI: 10.1213/ANE.0000000000004221
2. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
3. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
4. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SedLine^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SedLine, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Uses Masimo SedLine^® Brain Function Monitoring to Assess the Prevalence of Isoelectric EEG Events in Infants and Young Children Undergoing General Anesthesia

Irvine, California – June 24, 2019 – Masimo (NASDAQ: MASI) announced today that in a study recently published in Anesthesia & Analgesia, researchers investigated the incidence of isoelectric electroencephalogram (EEG) events in infants and young children undergoing scheduled surgery requiring general anesthesia.¹ To assess the prevalence of these events, the researchers used Masimo SedLine^® brain function monitoring, available on the Root^® Patient Monitoring and Connectivity Platform, which uses four leads and bilateral data acquisition to process frontal EEG signals. Because a subset of patients was also monitored with 10-channel EEG, the researchers were able to evaluate SedLine's accuracy and utility in such a scenario.

Dr. Ian Yuan and colleagues at the Children's Hospital of Philadelphia, the University of Pennsylvania, and Drexel University sought to evaluate the incidence of isoelectric EEG events in pediatric patients because anesthetic doses may be "greater than needed for surgery" in some infants and young children and isoelectric EEG events are associated with deep anesthesia (and in adults undergoing cardiac surgery, with "a higher incidence of postoperative delirium"). They evaluated 51 patients from 0 to 37 months old scheduled for surgery requiring general anesthesia (excluding cardiac, intracranial, and emergency cases). Anesthesia was maintained with sevoflurane or propofol infusion.

Noting that "Conventional 10- to 24-channel EEG is impractical for pediatric anesthesia as it is labor intensive and requires special training in both performance and interpretation," the researchers chose to record EEG for the duration of anesthesia using Masimo SedLine. To evaluate whether isoelectric events were generalized beyond the frontal cortex, they also recorded simultaneous data using 10-electrode EEG (Natus Xltek) for 10 patients (2-10 months old). Isoelectric events were defined as EEG with amplitude <20 μV for ≥2 seconds.

The researchers found that isoelectric events occurred in 63% of patients (95% confidence interval of 49% – 76%), representing 0% – 2.2% of total anesthetic time. A pediatric electroencephalographer compared the EEG recordings for 9 of the 10 patients monitored with both SedLine and 10-channel EEG and found that isoelectric events observed with SedLine were also observed across all channels with 10-channel EEG, noting "The Matlab program identified 47 isoelectric events from the SedLine EEG, and all events were confirmed by the electroencephalographer."

Dr. Yuan commented, "We were surprised by how prevalent isoelectric EEG occurred in healthy infants and young children undergoing routine general anesthesia, regardless of anesthetic technique. The Masimo SedLine EEG could be applied quickly without interfering with anesthesia care and could accurately record EEG in infants and young children in the operating room, suggesting it could be used to adjust anesthesia dosing."

Study co-author Dr. C. Dean Kurth added, "Pediatric anesthesiologists often unknowingly administer more sevoflurane or propofol anesthesia to infants and young children than their brain requires to produce anesthesia."

Regarding the use of SedLine, the researchers concluded, "Although the SedLine EEG monitors only frontal cortex, the 10-electrode EEG showed that the isoelectric events were generalized to the parietal, temporal, and occipital cortices as well, suggesting that the SedLine EEG could be used to monitor anesthetic-related isoelectric events." They continued, "EEG monitoring may enable dose titration to optimize the anesthetic depth and minimize periods of isoelectricity. Our results suggest that portable 4-channel EEG monitors are feasible for this purpose." With SedLine, periods of isoelectricity, or burst suppression, are easily visible on the Density Spectral Array (DSA), a color-coded display of processed EEG power, as black bars.

SedLine and Next Generation SedLine have received FDA clearance for use on adult patients. Next Generation SedLine has received CE marking for use on pediatric patients (one year old and above).

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.² Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,³ improve CCHD screening in newborns,⁴ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response team activations, ICU transfers, and costs.^5-7 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^® and Radius™ PPG, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi and RPVi have not received FDA 510(k) clearance and are not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Yuan I, Landis W, Topjian A, Abend N, Lang S, Huh J, Kirschen M, Mensinger J, Zhang B, and Kurth C. Prevalence of Isoelectric Electroencephalography Events in Infants and Young Children Undergoing General Anesthesia. Anesth Analg. 2019. DOI: 10.1213/ANE.0000000000004221
2. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
3. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
4. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SedLine^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SedLine, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces FDA Clearance of Neonatal Indication for O3^® Regional Oximetry

Irvine, California – June 10, 2019 – Masimo (NASDAQ: MASI) announced today that O3^® Regional Oximetry has received FDA clearance for use on neonatal and infant patients (<10 kg). O3 may help clinicians monitor cerebral oxygenation in situations in which peripheral pulse oximetry alone may not be fully indicative of the oxygen in the brain. With this expansion of the O3 platform, the benefits of monitoring with O3 are now available to patients of all ages, from neonates to adults.

O3, which uses near-infrared spectroscopy (NIRS) to monitor the regional hemoglobin oxygen saturation of blood (rSO₂) on both sides of the brain, may be particularly helpful in providing insight into neonatal patient status because neonatal pathology is often brain-related.¹ In neonates, O3 provides reliable measurement with a 3% A_RMS* trending accuracy specification.

O3 sensors are available in three sizes, for adult (≥40 kg), pediatric (≥5 kg and <40 kg) and now infant and neonatal (<10 kg) patients. With its smaller size and flexible design, the neonatal sensor is designed to fit easily and comfortably on the delicate foreheads of tiny patients.

O3 is available as a Masimo Open Connect^® (MOC-9^®) module for the Root^® Patient Monitoring and Connectivity Platform. Root is a powerful, expandable hub that integrates an array of technologies, devices, and systems to provide multimodal monitoring and connectivity solutions. Root's plug-and-play expansion capabilities allow clinicians to simultaneously monitor with O3 and other measurements, such as SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, providing clinicians with expanded visibility of neonatal oxygenation status. Additional modalities available on Root include advanced rainbow^® noninvasive measurements such as total hemoglobin (SpHb^®), SedLine^® brain function monitoring (available for adult patients), NomoLine^® capnography, and more – all via an easy-to-interpret, customizable display. Using Root in combination with Masimo Patient SafetyNet™ or Iris Gateway™, monitoring data from O3 can be automatically charted in electronic medical records (EMRs).

Joe Kiani, Founder and CEO of Masimo, said, "From our inception, we have been committed to improving outcomes for the youngest and most fragile patients. Our foundational SET^® pulse oximetry was designed with neonates and infants in mind. These patients were not an afterthought. This focus has paid off for these young patients: SET^® pulse oximetry has helped clinicians reduce the incidence of severe retinopathy of prematurity (ROP) in neonates² and improve critical congenital heart disease (CCHD) screening in newborns.³ O3 Regional Oximetry, with its ability to help clinicians accurately track cerebral oxygen saturation, will hopefully have a similar impact. We are happy to be able to bring O3's advanced capabilities and accuracy to the neonatal patient population."

@MasimoInnovates || #Masimo

*A_RMS accuracy is a statistical calculation of the difference between device measurements and reference measurements. Approximately two-thirds of the device measurements fell within ± A_RMS of the reference measurements in a controlled study.

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.⁴ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,² improve CCHD screening in newborns,³ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response team activations, ICU transfers, and costs.^5-7 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^® and Radius™ PPG, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi and RPVi have not received FDA 510(k) clearance and are not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Dix et al. Monitoring Cerebral Oxygenation in Neonates: An Update. Frontiers in Pediatrics. 2017.
2. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
3. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
4. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo O3^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo O3, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

NuVision Management Healthcare Consulting Company, One of the Largest U.S. Providers of Long-term Care for Medically Complex Children, Converts to Masimo

NuVision to Deploy Masimo SET^®, Root^® with Radical-7^®, NomoLine^® Capnography, and Patient SafetyNet™ at Four Locations

Fort Lauderdale, Florida – May 28, 2019 – Masimo (NASDAQ: MASI) announced today that NuVision Management Healthcare Consulting Company, a pediatric and adult healthcare consulting company, is adopting a comprehensive variety of Masimo technologies at its three pediatric care facilities in New Jersey and Florida, including Voorhees Pediatric (121 beds), Weisman Children's Rehabilitation Hospital (18 beds), and Plantation Kidz Korner (95 beds), as well as at a fourth, adult-care location, Clark Nursing and Rehabilitation Center (144 beds).

Pat Budo, Director of the Pediatric Complex Care Association (PCCA), said, "NuVision is the latest member of the Pediatric Complex Care Association to install Masimo technology. They join a large number of current PCCA members in utilizing this technology to support children with medical complexity. Both NuVision and Masimo share our vision of promoting excellence across the continuum of care for these extraordinary children."

At every medically complex patient's bedside at the four locations, NuVision is installing Masimo Root^® Patient Monitoring and Connectivity Hubs equipped with Radical-7^® Pulse CO-Oximeters^®, allowing patients to be monitored using Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, in addition to a variety of other rainbow SET™ parameters. NomoLine^® capnography, available as a MOC-9^® expansion module for Root, will be used to support the management of children on ventilators. Data from the ventilators will also be available on Root, via Masimo Iris^® third-party connectivity, an integration NuVision is planning to implement this summer.

Masimo Patient SafetyNet™, a supplemental remote monitoring and clinician notification system, will allow clinicians to view monitoring data for all beds from central view stations. When changes occur in measured values that may indicate deterioration in a patient's condition, Patient SafetyNet automatically sends wireless alerts directly to clinicians, wherever they may be, allowing them to respond quickly and efficiently to potential changes in patient status. Facilitated by Patient SafetyNet, all of the data captured by Root and devices connected to it will be transferred automatically to patient electronic medical records (EMRs) – including monitoring data, vital signs, and clinician-initiated early warning scores using the PEWS (pediatric early warning score) protocol, which NuVision plans to start using later this year as another way to help clinicians identify changes in patient condition.

"These systems and technologies have been a great addition to our organizations," said Trish Cunningham, RRT, Clinical Director of Respiratory Care at Voorhees Pediatric Facility and Weisman Children's Rehabilitation Hospital. "We are already noticing improvements in patient care and are excited about the upcoming integrations and capabilities."

Masimo Root is a powerful, expandable bedside platform that integrates an array of technologies, devices (such as Radical-7 and the wearable Radius-7^®), and systems to provide multimodal monitoring and connectivity solutions – in a single, clinician-centric hub. Root's plug-and-play expansion capabilities allow clinicians to simplify patient monitoring by bringing together advanced rainbow SET Pulse CO-Oximetry, brain function monitoring, regional oximetry, capnography, third-party devices, and vital signs measurements on an easy-to-interpret, customizable display, empowering clinicians with important information for making patient assessments.

Mike Rosiak, Chief Operating Officer of Weisman Children's Rehabilitation Hospital and Voorhees Pediatric Facility said, "Masimo's Root and Patient SafetyNet medical systems will help us to provide the best care for our medically fragile children and enable them to reach their full potential."

Jon Coleman, President of Worldwide Sales, Professional Services, and Medical Affairs, Masimo, said, "We are proud to partner with NuVision and bring the benefits of our innovative, versatile, and proven medical technologies and connectivity solutions to these particularly vulnerable patients. We look forward to helping clinicians improve patient outcomes and the lives of families with medically fragile children."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.¹ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,² improve CCHD screening in newborns,³ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response team activations, ICU transfers, and costs.^4-6 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁷ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁸ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^® and Radius™ PPG, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
2. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
3. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
4. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
5. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
6. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
7. Estimate: Masimo data on file.
8. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SET^®, rainbow SET™, Root^® with Radical-7^®, NomoLine^®, and Patient SafetyNet™. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SET^®, rainbow SET, Root with Radical-7, NomoLine, and Patient SafetyNet, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Evaluates Ability of Masimo SpHb^® (Noninvasive Hemoglobin) to Estimate Timing for Invasive Measurement to Detect Anemia During Surgery

Neuchatel, Switzerland – May 20, 2019 – Masimo (NASDAQ: MASI) announced today the results of a study published in BMC Anesthesiology in which clinicians at Peking Union Medical College in Beijing evaluated the ability of noninvasive and continuous hemoglobin monitoring with Masimo SpHb® to help clincians estimate when to conduct invasive hemoglobin measurement to detect possible anemia in patients undergoing spine or cytoreductive surgery.¹

Noting that because of the "invasive, time-consuming and intermittent" nature of invasive blood sampling, clincians often forgo these "objective indications" when making transfusion decisions during surgery, Dr. Tang and colleagues sought to determine whether noninvasive, continuous hemoglobin monitoring could aid clinicians in estimating when it might be appropriate to perform an invasive measurement. They enrolled 69 adult patients scheduled for spine surgery or cytoreductive surgery for whom estimated blood loss was more than 15% of total blood volume. The patients were randomly divided into an SpHb group (32 patients) and a standard care group (37 patients). In the SpHb group, diagnostic blood samples were drawn when a patient's SpHb, measured using a Masimo Radical-7^® Pulse CO-Oximeter^®, decreased by 1 g/dL. In the standard care group, they were drawn at the clinicians' discretion. Blood gas analysis was performed using a Radiometer ABL800. The researchers determined the positive predictive value (PPV) of SpHb for the SpHb group and clinician perception in the standard care group in detecting a decrease in lab hemoglobin of more than 1 g/dL or lab hemoglobin of less than 10 g/dL.

The researchers found that the incidence of unnecessary hemoglobin measurement was lower in the SpHb group than the standard care group. For a decrease of greater than 1 g/dL in lab hemoglobin, SpHb had a PPV of 93.3%, compared to 54.5% for clinical perception (p = 0.002). For hemoglobin lower than 10 g/dL, SpHb had a PPV of 86.7%, compared to 50.0% for clinical perception (p = 0.015). In the SpHb group, lab hemoglobin was never less than 7 g/dL. In addition, using Bland-Altman analysis, the researchers calculated that, compared to lab hemoglobin, SpHb had bias and precision of -0.29 ± 1.03 g/dL, with limits of agreement of -2.30 and 1.72 g/dL. No difference was observed in transfusion units or postoperative hemoglobin concentrations between the two groups.

The researchers concluded, "The SpHb trend tracked changes in hemoglobin satisfactorily during surgery and more accurately estimated the appropriate timing for invasive hemoglobin measurements than the clinicians." They also noted that "This study was the first diagnostic randomized controlled trial to explore the triage role of Pulse CO-Oximetry in the intraoperative detection of anemia. We found that the trend in SpHb could detect a decrease in Hb in dynamic situations and indicate the appropriate timing for further Hb measurements."

@MasimoInnovates || #Masimo

SpHb monitoring is not intended to replace laboratory blood testing. Clinical decisions regarding red blood cell transfusions should be based on the clinician's judgment considering, among other factors: patient condition, continuous SpHb monitoring, and laboratory diagnostic tests using blood samples.

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.² Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,³ improve CCHD screening in newborns,⁴ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response team activations, ICU transfers, and costs.^5-7 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^®, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Tang Bo, Yu X, Xu L, Zhu A, Zhang Y, and Huang Y. Continuous noninvasive hemoglobin monitoring estimates timing for detecting anemia better than clinicians: a randomized controlled trial. BMC Anesthesiology. 17 May 2019. https://doi.org/10.1186/s12871-019-0755-1
2. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
3. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
4. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces FDA Clearance of Radius PPG™, the First Tetherless SET^® Pulse Oximetry Sensor Solution

Irvine, California – May 16, 2019 – Masimo (NASDAQ: MASI) announced today FDA 510(k) clearance of Radius PPG, a tetherless sensor solution powered by Masimo SET^® that represents a significant breakthrough in patient monitoring. Radius PPG eliminates the need for a cabled connection to a pulse oximetry monitor, allowing patients to move freely and comfortably while still being continuously monitored reliably and accurately. Via wireless connection, measurements are displayed on Masimo host devices or third-party multi-parameter monitors with integrated Masimo technology, making Radius PPG immediately available for approximately two million monitors around the world. Coupled with the proven benefits of Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, Radius PPG is suited for use anywhere patients can benefit from mobility.

Radius PPG gives patients freedom of movement without interrupting continuous monitoring. Wireless connection to a host device is simple to establish and each Radius PPG can easily pair with multiple devices (maintaining connection to any one device at a time), simplifying transfers between care areas. Radius PPG works with its integrated battery for about four days and stores up to four days (96 hours) of patient data; in the event of wireless interruption, Radius PPG provides seamless retransmission once the connection is restored. Automated by Masimo's connectivity solutions, patient data can be used for remote clinician notifications of changes in patient condition and automatically transferred to the patient's EMR.

Studies have shown that patient mobility is a key factor in more rapid patient recovery.^1,2 In addition, the removal of cables has been shown to contribute to greater patient comfort, convenience, and patient satisfaction compared to tethered patient monitoring.³ Radius PPG allows patients to move throughout the hospital room, to the bathroom, and to other care areas without the need for physical disconnection and reconnection. In places like the neonatal ICU, care providers and parents can hold infants without interrupting monitoring or risking an uncomfortable tug on the patient. Radius PPG not only offers patients improved comfort and convenience but improves clinician workflows.

Radius PPG harnesses the power of clinically proven Masimo SET^® technology to provide accurate measurement even while patients move. Over 100 independent and objective studies have shown that SET^® outperforms other pulse oximetry technologies during conditions of motion and low perfusion.⁴ When used in conjunction with Patient SafetyNet™, continuous monitoring using SET^® in post-surgical wards has been shown to reduce rapid response team activations and transfers back to the ICU.^5-7 Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity (ROP) in neonates⁸ and improve critical congenital heart disease (CCHD) screening in newborns.⁹ Today, Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,¹⁰ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.¹¹

Joe Kiani, Founder and CEO of Masimo, said, "We are excited to announce the Radius PPG tetherless, wearable SET^® pulse oximetry sensor solution. Accurate, high-quality monitoring data can now travel from an ambulating patient to a variety of monitoring platforms, allowing a patient's physiological status to be continuously monitored when it's needed most."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.⁴ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,⁸ improve CCHD screening in newborns,⁹ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response team activations, ICU transfers, and costs.^5-7 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,¹⁰ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.¹¹ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^®, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Needham D et al. Archives of Physical Medicine and Rehabilitation. Vol 91, Issue 4, PP 536–542, April 2010.
2. Ronnenbaum J et al. J Acute Care Phys Ther. 2012;3(2):204-210.
3. Fensli R et al. J Med Syst (2010) 34: 767. https://doi.org/10.1007/s10916-009-9291-8.
4. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
9. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
10. Estimate: Masimo data on file.
11. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Radius PPG™ and SET^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Radius PPG and SET^®, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo and Mindray Announce Expanded Partnership

Mindray to Offer Masimo SET^® Pulse Oximetry in its Patient Monitoring Devices in Additional Countries Beyond the United States

Neuchatel, Switzerland and Shenzhen, China – May 13, 2019 – Masimo (NASDAQ: MASI) and Shenzhen Mindray Bio-Medical Electronics Co., Ltd. (SZSE: 300760) announced today that they have entered into a purchase and license agreement, under which Mindray will offer Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry – noninvasive, continuous measurement of oxygen saturation (SpO₂), pulse rate (PR), and perfusion index (Pi) – in its monitoring devices. Mindray devices equipped with SET^® will now be available in select countries in Europe, the Middle East, Russia and the Commonwealth of Independent States, and Asia-Pacific (excluding China), including Australia and India.

With the invention of Signal Extraction Technology^® (SET^®), Masimo established a new standard for pulse oximetry by introducing the ability to measure through motion and low perfusion. In a study comparing multiple pulse oximetry technologies, SET^® was shown to demonstrate the highest sensitivity and specificity in identifying desaturation events and avoiding false desaturation events during these conditions.¹ SET^® has also opened up new frontiers in patient monitoring during challenging conditions: outcome studies have shown that SET^®, combined with clinical assessment, has helped clinicians reduce retinopathy of prematurity (ROP) in neonates,² improve critical congenital heart disease (CCHD) screening in newborns,³ and through continuous monitoring of patients in post-surgical wards, reduce ICU transfers and rapid response team activations.^4-6 In all, over 100 independent and objective studies have shown that SET^® outperforms other pulse oximetry technologies.⁷ Masimo continues to refine SET^®, and recently announced that SpO₂ accuracy specifications have now improved to 1.5% in conditions of motion and no motion for adult, pediatric, and infant patients (> 3 kg) with RD SET™ sensors. Now, the benefits of Masimo SET^® are also available to clinicians using Mindray's devices in many countries outside the United States, where Mindray has offered SET^® pulse oximetry in devices from Datascope (which began offering SET^® in 1998) since acquiring Datascope in 2008.

Mindray is a leading global provider of medical devices and solutions. Mindray's products and services can be found in healthcare facilities in over 190 countries, and over 1.1 million Mindray monitors have been used or are in use across the world, representing the world's third-largest patient monitoring market share. Patient monitors now available with integrated Masimo SET^® pulse oximetry include the Mindray BeneVision N and BeneView T series for use in high-acuity environments and the ePM, iPM, and iMEC series for use in a variety of clinical scenarios, among other devices.

Jon Coleman, President of Worldwide Sales, Professional Services, and Medical Affairs, Masimo, commented, "We're excited to enter into this agreement with Mindray, so that more patients, clinicians, and hospitals can benefit from the unmatched performance of Masimo SET^® pulse oximetry."

Yang Ting, General Manager of International Sales and Marketing, Patient Monitoring and Life Support, Mindray, said, "We are very happy to expand our cooperation with Masimo from North America to more regions, so that our customers will have access to the outstanding SpO₂ technology from Masimo. It is a proof of our constant commitment to bringing advanced medical technologies to people in need, and making better healthcare more accessible for all."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.⁷ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,² improve CCHD screening in newborns,³ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^4-6 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^®, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Shah N et al. Performance of Three New-Generation Pulse Oximeters During Motion and Low Perfusion in Volunteers. J Clin Anesth. 2012 Aug;24(5):385-91.
2. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
3. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
4. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
5. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
6. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
7. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

About Mindray
Founded in 1991, Mindray is one of the leading global providers of medical devices and solutions. Firmly committed to our mission of "advance medical technologies to make healthcare more accessible," Mindray is dedicated to innovation in the fields of Patient Monitoring and Life Support, In-Vitro Diagnostics, and Medical Imaging System. Mindray possesses a sound global research and development, marketing and service network. Inspired by the needs of customers, Mindray adopts advanced technologies and transforms them into accessible innovation, bringing healthcare within reach. While improving the quality of care, Mindray helps reduce its cost, making it more accessible to a larger part of humanity. Today, Mindray's products and services can be found in healthcare facilities in over 190 countries and regions. In China, Mindray's products and solutions can be found in over 110,000 medical institutions and 99% of Class A tertiary hospitals.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SET^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SET^®, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Vicky Wang
Mindray
Phone: 0086 755 81888775
Email: vickywang@mindray.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces Halo ION™

Irvine, California – April 30, 2019 – Masimo (NASDAQ: MASI) announced today that after a decade of developing and testing its comprehensive, scalable, and customizable continuous early warning score, with the aid of leading expert clinicians around the world, it is releasing Halo ION™. Halo ION allows clinicians to aggregate trend data from as few as three physiological parameters (oxygen saturation, pulse rate, and perfusion index), and as many as are available, including data from EMRs, into a single continuous early warning score. Each patient's Halo ION score is displayed on the Masimo Patient SafetyNet™ Supplemental Remote Monitoring and Clinician Notification System as a number ranging from zero to 100, helping to streamline clinicians' patient assessment workflow.

What is difficult for people is easy for Halo ION: in calculating scores, Halo ION not only takes advantage of immediately available patient data, but more importantly, keeps track of historical physiological data and data from other records. Halo ION thus helps to automate the process by which clinicians assess patient status over time, providing a cumulative, trended score for each patient, easily visible on the Patient SafetyNet View Station or Replica™ mobile application, configured according to their clinical protocols, that can help facilitate their determination of a patient's overall status. Trends in Halo ION scores, which are calculated according to how the hospital has chosen to configure Halo ION, help clinicians evaluate whether patients are improving or deteriorating according to their own criteria. Clinicians may then use this information to, for example, intervene with certain patients, to transfer or discharge certain patients, and to schedule nursing assignment loads accordingly.

Halo ION works by continuously extracting key characteristics from clinician-selected parameters that are continuously monitored on the Root^® Patient Monitoring and Connectivity Hub and anything connected to Root – such as oxygen saturation (SpO₂ using Masimo SET^® pulse oximetry), noninvasive hemoglobin (SpHb^®), blood pressure, temperature, and pulse rate – to create an overall score. Hospitals and clinicians determine which parameters to include in the overall score, how each is configured, how each is weighted, and how combinations of changes across multiple parameters affect scoring – providing the flexibility and customizability to ensure that Halo ION reflects each institution's assessment policy.

Unlike other early warning score assessment tools, which take spot-check snapshots of patient vital signs, Halo ION provides cumulative, continuous visibility into patient status over time, taking into account not only historical trend data for each parameter but also more complex characteristics, such as a parameter's degree of stability and variability. Halo ION creates individualized, patient-specific baseline scores for each parameter – not global, one-size-fits-all thresholds – and tracks how each patient deviates from their baselines, adjusting the overall Halo ION score differently for different patients. For example, the Halo ION score might be different for two patients whose oxygen saturation drops to 89% if one patient normally has 100% SpO₂ and the other 94%; those different deltas would be reflected in different amounts of change in their Halo ION scores.

Joe Kiani, Founder and CEO of Masimo, commented, "Precision medicine is no longer only about the right drug for the right patient based on their genetics, but also about individualized assessment of their state of health. Halo ION represents many years of research into how best to take the complex, almost overwhelming stream of high quality physiological data available to clinicians and present it in a way that is intuitive, efficient, and provides individualized insight into a patient's overall status. With its unique ability to create patient-specific baselines and to take into account many subtle changes over time, Halo ION helps automate and simplify the process of patient assessment, helping clinicians stay focused on providing the best care for their patients."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global medical technology company that develops and produces a wide array of industry-leading monitoring technologies, including innovative measurements, sensors, patient monitors, and automation and connectivity solutions. Our mission is to improve patient outcomes and reduce the cost of care. Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, introduced in 1995, has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.¹ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,² improve CCHD screening in newborns,³ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^4-6 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁷ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁸ Masimo continues to refine SET^® and in 2018, announced that SpO₂ accuracy on RD SET™ sensors during conditions of motion has been significantly improved, providing clinicians with even greater confidence that the SpO₂ values they rely on accurately reflect a patient's physiological status. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), RPVi™ (rainbow^® PVi), and Oxygen Reserve Index (ORi™). In 2013, Masimo introduced the Root^® Patient Monitoring and Connectivity Platform, built from the ground up to be as flexible and expandable as possible to facilitate the addition of other Masimo and third-party monitoring technologies; key Masimo additions include Next Generation SedLine^® Brain Function Monitoring, O3^® Regional Oximetry, and ISA™ Capnography with NomoLine^® sampling lines. Masimo's family of continuous and spot-check monitoring Pulse CO-Oximeters^® includes devices designed for use in a variety of clinical and non-clinical scenarios, including tetherless, wearable technology, such as Radius-7^®, portable devices like Rad-67™, fingertip pulse oximeters like MightySat^® Rx, and devices available for use both in the hospital and at home, such as Rad-97™. Masimo hospital automation and connectivity solutions are centered around the Iris^® platform, and include Iris Gateway™, Patient SafetyNet, Replica™, Halo ION™, UniView™, and Doctella™. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
2. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
3. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
4. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
5. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
6. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
7. Estimate: Masimo data on file.
8. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Halo ION™. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Halo ION, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo to Report First Quarter 2019 Financial Results after Market Close on Monday, May 6

Neuchatel, Switzerland – April 29, 2019 – Masimo (NASDAQ: MASI) and Mdoloris Medical Systems announced today the CE marking of the Mdoloris Analgesia Nociception Index (ANI^®) module for the Masimo Root^® Patient Monitoring and Connectivity Hub, the first commercially available result of a Masimo Open Connect^® (MOC) third-party partnership, between Mdoloris and Masimo.

Masimo's unique approach to medical technology integration through Masimo Open Connect partnerships addresses some of the major barriers to new technology adoption in patient monitoring. The Root platform's open architecture and advanced connectivity enable third-party companies to bypass barriers and the time it takes for traditional multi-parameter monitor integration by controlling their own Root integration projects. Third parties can then independently develop, obtain regulatory approvals, and commercialize their own external MOC-9^® module or MOC-C^® app for Root using Masimo's MOC software development kit and support from Masimo's engineering and distribution teams.

Joe Kiani, Founder and CEO of Masimo, said, "We are proud to announce ANI, the first commercially available third-party MOC-9 module for Root, the first of many to come. With the ongoing expansion of its capabilities, Root becomes a more powerful bedside platform than ever. We believe that Root with Masimo Open Connect can do for patient monitoring what the PC did for computing: speed up the patient monitoring innovation cycle, reduce the cost of patient monitoring, and prolong the useful life of the equipment hospitals invest in."

"We are delighted to be able to announce that ANI is now cleared for sale in the EU," said Fabien Pagniez, Founder and CEO of Mdoloris Medical Systems. "We consider Masimo to be the most innovative company in the patient monitoring space and we believe Root offers a unique and compelling solution for implementing our ANI technology."

ANI on Masimo Root has not received 510(k) clearance and is not available for sale in the United States.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.¹ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,² improve CCHD screening in newborns,³ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^4-6 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁷ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁸ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
2. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
3. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
4. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
5. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
6. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
7. Estimate: Masimo data on file.
8. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

About Mdoloris Medical Systems
Mdoloris (www.mdoloris.com), a medical devices manufacturer, was created in June 2010 out of 23 years of academic research performed in Lille University hospital, France. It has an international representation in more than 64 countries and a scientific, technical and medical acknowledgement. Mdoloris has so far developed three products, all able to continuously assess the pain level of patients (the ANI technology for patients older than two years old, the NIPE technology for neonates, and the PTA technology for pets). Its innovative technologies provide clinical added value for clinicians who are not able to communicate with their patients in order to personalize pain medications and avoid known side effects due to over- and under-dosage of such drugs. More than 1,200 devices are now used by anesthesiologists and intensivists wordwide and more than 140,000 patients have benefited from Mdoloris' technologies. Mdoloris's standalone monitor promoting its innovative adult technology has received 510(k) clearance through the HFVI brand in the US under the number K142969. Mdoloris recently closed a nine-million euro fundraising round in order to keep developing new-to-the-world technologies that always keep one target in mind: helping clinicians improve the quality of care.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Root^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Root, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Pierrick Niewiadowski
Mdoloris
Email: pierrick.niewiadowski@mdoloris.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Study Investigates Cerebral Oxygenation Normative Values Using Masimo O3® Regional Oximetry

Neuchatel, Switzerland – April 15, 2019 – Masimo (NASDAQ: MASI) announced today the findings of a study, recently published in Anaesthesia and Intensive Care, in which researchers at Austin Hospital in Melbourne, Australia sought to measure cerebral oxygenation in a large cohort of healthy volunteers, using Masimo O3^® Regional Oximetry, to establish a normal range of values and investigate the relationship between cerebral oxygenation and other physical and hemodynamic characteristics.¹ O3 uses near-infrared spectroscopy (NIRS) to monitor cerebral oxygenation in situations in which peripheral pulse oximetry alone may not be fully indicative of the oxygen in the brain.

Noting that "normative values for clinical devices are essential to allow for definition of abnormality during clinical use" and that available regional cerebral tissue oxygen saturation (SctO₂) reference values have limitations, including not taking into account variables such as brain hemisphere, sex, skin type, height, weight, and others, Dr. Christopher Eyeington and colleagues used Masimo O3 to assess for differences in SctO₂ between hemispheres, sex, and comorbidity and smoking status, and for associations between SctO₂ and key physical and hemodynamic characteristics, in healthy adults. They enrolled 98 volunteers, 22-60 years old, including 41 males, 22 with one or more co-morbidities, 13 current or former smokers, and with a variety of skin types. Each volunteer was monitored continuously for five minutes using O3 on the Masimo Root^® Patient Monitoring and Connectivity Hub, with SctO₂ measurements recorded every two seconds.

The researchers recorded 32,130 SctO₂ observations. Mean left, right, and combined average SctO₂ values were 67.3%, 67.9%, and 67.6%, respectively, with a "narrow" combined average 95% confidence interval of 66.8% to 68.6%. (None of the 95% confidence intervals was lower than 66.5% or greater than 69.1%.) The researchers found "statistically significant yet quantitatively small differences" in SctO₂ values according to hemisphere (p < 0.001). They also found that increasing mean arterial pressure (MAP) (p = 0.001) and cardiac index (CI) (p ≤ 0.001) were associated with increased SctO₂: each 10 mmHg increase in MAP and 1 L/min/m² increase in CI was associated with 0.01% and 0.1% increases in SctO₂, respectively.

The researchers noted, "Our study implies that in healthy adults the mean SctO₂ measured with modern technology is close to 68% with narrow confidence intervals of 1%, and with no difference between hemispheres. Moreover, given a lowest mean combined bi-hemispheric SctO₂ value of 56%, it implies that an SctO₂ value below 56% should be considered 'abnormally low.' In addition, the very few SctO₂ values below 60% seen in our study imply that persistent measurements below such a threshold should be viewed with concern. Finally, our observation that SctO₂ values were not affected in any clinically significant amount by hemispheres, sex, skin type, comorbidity or smoking status, age or any haemodynamic parameter implies that in healthy adults, cerebral tissue oxygen saturation is unaffected by these factors." They concluded that "These findings have significant implications regarding the clinical interpretation of SctO₂ and the application of this information to individual patients."

Study co-author Dr. Rinaldo Bellomo commented, "The estimation of cerebral oxygenation by near infrared spectroscopy (NIRS) during anesthesia or in critical illness is becoming increasingly recognized as a desirable form of monitoring. Thus, it is vital for clinicians to understand normal values and to have confidence in the technology behind such measurements. The recent study by my colleagues and myself used >30,000 observations in close to 100 normal subjects and found that the mean normal value for cerebral oxygen estimation using modern Masimo NIRS technology was 67.6%, and, more importantly, that the 95% confidence interval for such value was narrow, between 66.8% and 68.6%. Such findings provide a reference value for patient assessment and give a degree of confidence to clinicians in relation to the validity and robustness of this technology."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.² Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,³ improve CCHD screening in newborns,⁴ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^5-7 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Eyeington C, Ancona P, Osawa E, Cutuli S, Eastewood G and Bellomo R. Modern technology-derived normative values for cerebral tissue oxygen saturation in adults. Anaesthesia and Intensive are. 2019. DOI: 10.117.7/0310057X18811962.
2. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
3. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
4. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo O3^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo O3, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo to Report First Quarter 2019 Financial Results after Market Close on Monday, May 6

IRVINE, Calif – April 15, 2019 – Masimo (NASDAQ: MASI) announced today that it will release first quarter 2019 financial results for the period ended March 30, 2019, after the market closes on Monday, May 6, 2019. The conference call to review the results will begin at 1:30 p.m. PT (4:30 p.m. ET) and will be hosted by Joe Kiani, Chairman and Chief Executive Officer, and Micah Young, Executive Vice President and Chief Financial Officer.

A live webcast of the conference call will be available online from the investor relations page of the company's corporate website at www.masimo.com. The dial-in numbers are (888) 520-7182 for domestic callers and +1 (706) 758-3929 for international callers. The reservation code for both dial-in numbers is 2399557. After the live webcast, the call will be available on Masimo's website through June 6, 2019. In addition, a telephonic replay of the call will be available through May 13, 2019. The replay dial-in numbers are (855) 859-2056 for domestic callers and +1 (404) 537-3406 for international callers. Please use reservation code 2399557.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.² Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,³ improve CCHD screening in newborns,⁴ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^5-7 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

Investor Contact: Eli Kammerman
Phone: (949) 297-7077
Email: ekammerman@masimo.com

Media Contact: Irene Paigah
Phone: (858) 859-7001
Email: irenep@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces FDA Clearance of the Rad-67™ Pulse CO-Oximeter® with Next Generation SpHb® Spot-check Monitoring & rainbow® DCI®-mini Reusable Sensor

Irvine, California – March 25, 2019 – Masimo (NASDAQ: MASI) announced today FDA clearance of the Rad-67™ Pulse CO-Oximeter^® with Spot-check Next Generation SpHb^® monitoring technology and the rainbow^® DCI^®-mini Reusable Sensor. Rad-67 offers rainbow^® noninvasive hemoglobin measurement (SpHb) and Measure-through Motion and Low Perfusion™ SET^® pulse oximetry in a compact, portable spot-check monitoring device. When used with the rainbow^® DCI-mini sensor, Rad-67 provides spot-check monitoring with Next Generation SpHb.

Masimo Rad-67™

Next Generation SpHb technology significantly advances the forefront of noninvasive portable hemoglobin spot-check monitoring: SpHb field performance is enhanced across all hemoglobin ranges through faster measurement results and improved repeatability.¹

Rad-67's ability to provide portable spot-check monitoring measurements of both oxygen saturation and noninvasive hemoglobin makes it a single-device solution in multiple clinical and non-clinical settings, such as emergency rooms, pre-/post-surgery settings, and physicians' offices. Rad-67 features a rechargeable battery with six-hour run time, powering a high-resolution color display with intuitive touchscreen navigation that automatically adjusts brightness to optimize visibility in a variety of care settings. Rad-67's feedback screens provide real-time user guidance during SpHb measurement to help reduce error, while the slim-profile sensor connector port is designed to provide tactile feedback upon proper connection.

Rad-67 provides convenient historical data review directly on the device, with unique patient identifiers to help improve organization of records and workflow. Built-in wireless connectivity will enable data transfer to the EMR and printing results at the point of care, which may help reduce the likelihood of transcription errors² or incomplete case records.

Professor Andrew Klein, Chair of the Department of Anesthesia and Intensive Care at Royal Papworth Hospital in Cambridge, England, and Editor-in-Chief of Anaesthesia, commented, "The Rad-67 is incredibly easy to use and gives a quick result, perfect in our busy pre-operative clinic. We have found it particularly useful as it helps us target those patients who may need further testing."

Joe Kiani, Founder and CEO of Masimo, said, "We're proud to launch Rad-67, Spot-check Next Generation SpHb monitoring, and the rainbow^® DCI-mini in the United States. Spot-check Next Generation SpHb monitoring represents a significant enhancement to the noninvasive measurement we invented a decade ago – a measurement we look forward to continuing to improve."

Rad-67 spot-check SpHb monitoring is not cleared for use on pediatric patients, pregnant patients, and patients with renal disease. SpHb is not intended to replace laboratory blood testing. Blood samples should be analyzed by laboratory instruments prior to clinical decision making.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.³ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,⁴ improve CCHD screening in newborns,⁵ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^6-8 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁹ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.¹⁰ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Masimo field data on file.
2. The Value of Medical Device Interoperability. West Health Institute. 2013.
3. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
4. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
5. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
6. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
7. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
8. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
9. Estimate: Masimo data on file.
10. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Masimo Rad-67™, rainbow^® DCI^®-mini sensor, and Next Generation SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Masimo Rad-67, rainbow^® DCI-mini sensor, and Next Generation SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

St. Luke's University Health Network Achieves Compelling Outcome Results Following Implementation of Masimo Supplemental Remote Monitoring Solution

Non-profit Pennsylvania Network Is Expanding Use of Masimo Patient SafetyNet^™, Root^® with Radius-7^® and Vital Signs Check to Almost 500 Beds Across 10 Hospitals

Bethlehem, Pennsylvania – March 19, 2019 – St. Luke's University Health Network (St. Luke's) and Masimo (NASDAQ: MASI) announced today that St. Luke's, a regional network of 10 hospitals and 320 affiliated sites providing service to 10 counties in eastern Pennsylvania, is expanding their use of a variety of Masimo technologies following impressive outcome results at a pilot site.

Four years ago, seeking to improve patient safety and reduce morbidity and mortality in their hospitals, St. Luke's formed a multidisciplinary taskforce – comprised of anesthesiologists, nurses, respiratory specialists, hospital leaders, and others – charged with implementing changes and tracking outcomes in a pilot location, a 34-bed orthopedic trauma ward at their hospital in Bethlehem. As part of that program, which also involved changes in clinical practice and alarm management, St. Luke's installed Masimo Patient SafetyNet™, a supplemental remote monitoring and clinician notification system, in the pilot ward. Patients were monitored at the bedside using the Masimo Root^® patient monitoring and connectivity hub in conjunction with Masimo Radius-7^® tetherless, wearable Pulse CO-Oximeters^® that continuously monitor patients' oxygen saturation and pulse rate using Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry. Through Patient SafetyNet, these and other parameters can be continuously remotely monitored from central view stations and even smartphones, with the ability to alert clinicians from afar to possible deterioration in patient condition. In 2016, a year after implementation of the program, clinicians achieved impressive outcome and financial results compared to 2015 performance, including a 62% reduction in mortality, a 36% reduction in naloxone administration, a 23% reduction in the utilization of telemetry, a 26% reduction in critical care transfers, and an estimated savings of $900,000 in cost avoidance.

"Because of the unpredictability of which patients will deteriorate, continuous and in-depth monitoring provides a valuable level of data that can be acted upon quickly to save lives," said Aldo Carmona, MD, Chairman of the Department of Anesthesia and Critical Care and SVP of Clinical Integration, who leads the initiative. "Constant monitoring of changes in patient conditions will alert doctors and nurses when gradual deterioration is sensed, enabling a quicker therapeutic response and avoiding emergent situations."

Following the successful pilot program, St. Luke's expanded use of Patient SafetyNet to an additional 48 beds across two additional units on their Bethlehem campus. Now, three years later, the network is again expanding use of Patient SafetyNet and other Masimo solutions to almost 500 beds in total, so that all eight existing hospitals will have the technology – and in two hospitals slated to open this year, only Masimo continuous monitoring technologies will be used outside the ICU. Monitoring data is now automatically transferred from bedside devices and Patient SafetyNet to St. Luke's Epic electronic medical record (EMR) system, helping improve productivity and reducing the likelihood of transcription errors.¹ Vital Signs Check, an application for Root designed to streamline vital signs measurement workflows and optimize patient data management, is also being implemented. "With the higher acuity levels of many hospitalized patients, taking vital signs over four or eight hours is no longer effective in many cases, and developing conditions are missed until they become critical threats sometimes resulting in poor outcomes," Dr. Carmona said.

Speaking of the ongoing expansion and enhancement of their continuous monitoring program, Dr. Carmona commented, "This Patient SafetyNet initiative will be the most important patient safety project I will work on in my whole career."

St. Luke's sought inspiration from another institution's successful implementation of continuous monitoring using Masimo SET^® and Patient SafetyNet: Dartmouth-Hitchcock Medical Center in New Hampshire, where researchers found that continuous monitoring of adult post-surgical patients using Masimo SET^® pulse oximetry on Masimo bedside devices, in conjunction with Masimo Patient SafetyNet, resulted in a 65% reduction in rapid response team activations and a 48% reduction in transfers back to the ICU.² Over five years, Dartmouth-Hitchcock achieved their goal of zero preventable deaths or brain damage due to opioids,³ and over ten years, they maintained a 50% reduction in unplanned transfers and a 60% reduction in rescue events, despite increases in patient acuity and occupancy.⁴ With the monitoring of additional physiological parameters and integration into EMRs, St. Luke's initiative is set to provide even more continuous supplemental monitoring coverage than at Dartmouth-Hitchcock.

Joe Kiani, Founder and CEO of Masimo, said, "We are honored to partner with St. Luke's as they continue to expand their patient safety and monitoring initiatives. Our mission – to improve patient outcomes and reduce the cost of care – aligns well with their values. Their ongoing commitment to saving lives through our proven SET^® and Patient SafetyNet technology is a model we hope more and more institutions will see the benefits of implementing."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies.⁵ Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,⁶ improve CCHD screening in newborns,⁷ and, when used for continuous monitoring with Masimo Patient SafetyNet™ in post-surgical wards, reduce rapid response activations and costs.^2-4 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁸ and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.⁹ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at http://www.masimo.com/evidence/featured-studies/feature/.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. The Value of Medical Device Interoperability. West Health Institute. 2013.
2. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
3. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
4. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
5. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
6. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
7. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

About St. Luke's
Founded in 1872, St. Luke's University Health Network (SLUHN) is a fully integrated, regional, non-profit network of more than 15,000 employees providing services at 10 hospitals and over 320 outpatient sites. With annual net revenue greater than $2 billion, the Network's service area includes 10 counties: Lehigh, Northampton, Berks, Bucks, Carbon, Montgomery, Monroe and Schuylkill counties in Pennsylvania and Warren and Hunterdon counties in New Jersey. Dedicated to advancing medical education, St. Luke's is the preeminent teaching hospital in central-eastern Pennsylvania. In partnership with Temple University, St. Luke's created the Lehigh Valley's first and only regional medical school campus. It also operates the nation's longest continuously operating School of Nursing, established in 1884, and 28 fully accredited graduate medical educational programs with 226 residents and fellows. St. Luke's is the only Lehigh Valley-based health care system with Medicare's five- and four-star ratings (the highest) for quality, efficiency and patient satisfaction. St. Luke's is both a Leapfrog Group and Healthgrades Top Hospital. In 2019, three of IBM Watson Health's 100 Top Hospitals were St. Luke's hospitals. St. Luke's University Hospital has earned the 100 Top Major Teaching Hospital designation from IBM Watson Health seven times total and five years in a row. St. Luke's has also been cited by IBM Watson Health as a 50 Top Cardiovascular Program. Utilizing the Epic electronic medical record (EMR) system for both inpatient and outpatient services, the Network is a multi-year recipient of the Most Wired award recognizing the breadth of the SLUHN's information technology applications such as telehealth, online scheduling and online pricing information. St. Luke's is also recognized as one of the state's lowest cost providers.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Patient SafetyNet™, SET^®, Root^®, and Radius-7^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo Patient SafetyNet, SET^®, Root, and Radius-7, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Sam Kennedy, Corporate Communications Director
St. Luke's
Phone: (484) 526-4134
Email: samuel.kennedy@sluhn.org

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces CE Marking of Pediatric Indication for Next Generation SedLine^® Brain Function Monitoring

Next Generation SedLine Now Available for Use on Patients 1-18 Years Old in CE Mark Countries

Neuchatel, Switzerland – March 4, 2019 – Masimo (NASDAQ: MASI) announced today the CE marking of Next Generation SedLine^® brain function monitoring for pediatric patients (1-18 years of age). With this clearance, the benefits of Next Generation SedLine are available for all patients one year old and above in CE mark countries. SedLine helps clinicians monitor the state of the brain under anesthesia with bilateral data acquisition and processing of four leads of electroencephalogram (EEG) signals.

SedLine uses a pediatric-specific signal processing engine to improve performance of Masimo's processed EEG parameter, the Patient State Index (PSi), when monitoring pediatric patients one year old and above. The use and monitoring of anesthesia on pediatric patients can differ from its use on adults.^1-2 Maintaining an appropriate level of anesthesia is key to preventing anesthesia-related events and enabling faster recovery.³ The PSi in SedLine, driven by its pediatric-specific engine, is uniquely suited to helping clinicians interpret the EEGs of this challenging population.

In addition to the newly announced pediatric-specific signal processing when used on pediatric patients, Next Generation SedLine offers significant improvements over original SedLine, including:

• A PSi with less susceptibility to electromyography (EMG) interference.
• A Multitaper Density Spectral Array (DSA), which may enhance visibility of EEG features.

Joe Kiani, Founder and CEO of Masimo, said, "Next Generation SedLine is doing for brain function monitoring what Masimo SET^® did for pulse oximetry. We believe Next Generation SedLine is the best and most advanced way to monitor depth of sedation, crucial to helping ensure patients with even the most challenging brains are appropriately anesthetized. We are gratified that its benefits are now available to those younger patients whose brains are particularly delicate and to whose wellbeing Masimo has always been so committed."

Next Generation SedLine has received FDA clearance for adults but is not currently indicated for pediatric patients in the USA.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/cpub/clinical-evidence.htm.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Davidson et. Current Anesthesiology Reports 3. 1 (2013): 57-63.
2. Cornelissen L et al. Elife 4 (2015): e06513.
3. Musialowicz et al. Current Anesthesiology Reports 4. 3 (2014): 251-260.
4. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
5. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
6. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
7. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
8. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
9. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
10. Estimate: Masimo data on file.
11. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

New Case Series Investigates the Combined Use of Masimo SedLine® Brain Function Monitoring and O3^® Regional Oximetry During Cardiac Surgery

Doctella Facilitates Pre- and Post-hospital Care at Home with Customizable, Interactive CarePrograms™ That Utilize Patient-reported and Physiological Data

Neuchatel, Switzerland – February 25, 2019 – Masimo (NASDAQ: MASI) announced today the findings of a series of four clinical cases, recently published in the Canadian Journal of Anesthesiology, in which researchers at the University of Montreal found that combined use of Masimo SedLine^® brain function monitoring and O3^® regional oximetry assisted their understanding and management of cerebral desaturations during cardiac surgery.¹

Drs. Etienne Couture, Alain Deschamps, and Andr� Denault hypothesized that the addition of processed electroencephalography (pEEG) using Masimo SedLine's processed EEG parameter, the Patient State Index (PSi), to a previously developed clinical management algorithm based on Masimo O3 near-infrared spectroscopy (NIRS), could help guide the management of cerebral desaturation episodes. In this series of case studies, they describe the impact of combining the modalities on the clinical management of four patients undergoing cardiac surgery. The researchers then outline a series of scenarios that enumerate possible causes of desaturation based on various combinations of changes in NIRS and pEEG, as well as changes in related monitoring data available via SedLine, such as the density spectral array (DSA) and spectral edge frequency (SEF). Possible causes include a change in cerebral blood flow, cerebral hypoperfusion, cardiogenic shock, hypoxemia, a change in the anesthetic state, hyperthermia, and seizure. In the four cases, more insight into the likely cause of a desaturation episode helped guide how clinicians responded during surgery.

The researchers concluded, "Combining both NIRS and pEEG allows for a much more nuanced understanding of the etiology of cerebral desaturation. Future studies are needed to investigate if the combination of both modalities is more prognostic than each alone. Every cerebral oxygen desaturation is not equal."

Dr. Denault commented, "By combining NIRS and pEEG we were able to have a better appreciation of the significance of brain desaturation, and using Masimo O3 and SedLine in particular to obtain those measurements provided a number of advantages. The additional brain monitoring parameters available through Masimo SedLine, such as the DSA and SEF, play an important role in our protocol, helping to provide additional insight. And, perhaps most significantly, both SedLine and O3 can be used simultaneously on the same Masimo Root^® monitoring hub, making it easier to view and interpret the combined data and thus streamlining our use of the desaturation protocol and workflow during surgery."

Masimo O3 is not currently indicated for somatic use.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/cpub/clinical-evidence.htm.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Couture EJ, Deschamps A, and Denault AY. Patient management algorithm combining processed electroencephalographic monitoring with cerebral and somatic near-infrared spectroscopy: a case series. Can J Anesth. 2019. https://doi.org/10.1007/s12630-019-01305-y.
2. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
3. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
4. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces Doctella™, a Secure Cloud-based Patient Engagement and Remote Care Automation Platform

Doctella Facilitates Pre- and Post-hospital Care at Home with Customizable, Interactive CarePrograms™ That Utilize Patient-reported and Physiological Data

Irvine, California – February 11, 2019 – Masimo (NASDAQ: MASI) announced today the launch of Doctella™, a home-based patient engagement and remote care automation platform. Doctella provides a complete end-to-end home care solution, allowing clinicians to create and manage treatment plans, patient schedules, and patient data flow using automated, customizable CarePrograms™, home device data aggregation, and a web-based provider dashboard. CarePrograms are delivered to patients' smartphones via an app (available for both iOS^® and Android^® devices) and dynamically update based on patient input, both self-reported data and physiological data collected by connected monitoring devices.

CarePrograms, configurable via the web-based provider portal, represent a digital, dynamic, and intelligent upgrade to traditional home care plans. Data pushed to patients can include coaching, guidance, and recommendations, such as notifications to remind patients to take medications, connect monitoring devices, or exercise. In turn, the Doctella secure cloud pulls and processes data entered manually by patients – such as patient-reported outcomes and textual responses, with the ability to provide consent through the app – as well as data gathered from connected devices, such as the Masimo MightySat™ Rx fingertip SET^® pulse oximeter and the Masimo Rad-97™ rainbow SET™ Pulse CO-Oximeter^®, which can act as a Bluetooth^®-based hub, capable of pulling in data from a variety of Masimo and third-party devices. Doctella incorporates these data into logic-driven protocols and algorithms that can be customized to meet the needs of clinicians and institutions.

The Doctella provider portal allows clinicians to keep track of various physiological events (such as oxygen desaturations) and behaviors (such as confirming having taken medication as prescribed) for each patient, helping clinicians identify when intervention may be needed and how to prioritize the needs of multiple patients. Through such automation, institutions can more easily deploy home care monitoring at scale while helping clinicians remain abreast of important developments in patient condition. The provider portal can also collect population-level health data to help clinicians gauge the efficacy of various treatment protocols and develop new plans using data-driven decisions and strategy.

Peter Pronovost, MD, PhD, Chief Clinical Transformation Officer at University Hospitals, Ohio, and one of the co-developers of Doctella, said, "As healthcare seeks to improve value, it needs to change its narrative from success being patients healing in the hospital to patients being healthy at home. Doctella helps to accelerate that journey by making sure that patients receive safe, evidence-based care in the healing environment of their own home." Dr. Pronovost recently spoke about the need to change the healthcare narrative at the 2019 World Patient Safety, Science, and Technology Summit.

Patient monitoring at home is an important and increasingly recognized part of providing quality patient care. Home care may be beneficial, for example, for patients with conditions like chronic obstructive pulmonary disease (COPD) and post-surgical patients recuperating at home using prescribed opioids. With proper care pre- and post-surgery at home, patients are expected to do better and help reduce the rate of avoidable hospital readmissions.

Joe Kiani, Founder and CEO of Masimo, said, "Masimo has always sought ways to help caring clinicians automate and improve the care of their patients. Doctella extends our role into perioperative care outside the hospital and in the home. With customized, automated care plans which funnel patient data to clinicians while helping them prioritize and intervene as needed, Doctella brings clinicians and patients together comprehensively and securely with a complete, end-to-end solution."

Masimo Doctella will be debuted during the HIMSS19 Conference in Orlando, Florida starting February 11, at Masimo's booth 6259. To schedule a meeting or learn more, please contact sales@masimo.com.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/cpub/clinical-evidence.htm.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO2 Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
3. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
4. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces FDA Clearance of RRp^®, Respiration Rate from the Pleth, on the MightySat™ Rx Spot-Check Fingertip Pulse Oximeter

Masimo MightySat Rx, Now Also Indicated for Use at Home, is the First Fingertip Pulse Oximeter with SET^® and the First to Measure Respiration Rate

Irvine, California – January 28, 2019 – Masimo (NASDAQ: MASI) announced today FDA clearance of the measurement of respiration rate from the pleth (RRp^®) on the MightySat™ Rx spot-check fingertip pulse oximeter, as well as its indication for use in the home environment. The addition of RRp to MightySat Rx, which also measures functional oxygen saturation (SpO₂), pulse rate (PR), perfusion index (Pi), and Pleth Variability Index (PVi^®), makes it a more thorough and versatile spot-check solution.

Respiration rate, or the number of breaths taken per minute, typically requires manually counting breaths with a timer and then converting to a rate per minute, or being fitted with chest leads or straps that can be inconvenient. With RRp, respiration rate can conveniently be measured using the same optical sensor that measures SpO₂, PR, Pi, and PVi. RRp is provided only when the respiratory movement-induced signal is present in the pulsatile waveform and may not be available during certain conditions, such as very irregular breathing and excessive movement.

With the introduction of RRp to the U.S., Masimo now offers clinicians more ways to accurately measure breathing rate than ever, helping to ensure they have the right tools for each patient scenario. RRp on MightySat Rx offers a convenient, fast, and portable option, adding to the portfolio of respiratory solutions from Masimo that includes continuous, acoustic respiration rate monitoring using RRa^® and capnography-based solutions using NomoLine^®.

Alongside RRp, PVi, PR, and Pi, MightySat Rx features the same Measure-through Motion and Low Perfusion™ SET^® pulse oximetry available in a variety of bedside Masimo and OEM monitors. SET^® has been shown in over 100 independent and objective studies to outperform other pulse oximetry technologies,¹ is estimated to be used on more than 100 million patients a year,² and is the primary pulse oximetry at 9 of the top 10 hospitals listed in the 2018-19 U.S. News and World Report Best Hospitals Honor Roll.³ The benefits of SET^® are maximized by choosing the correct sensor type for each use scenario: adhesive sensors for continuous monitoring, reusable sensors for short-term monitoring, and MightySat Rx fingertip oximeters for spot-check measurements.

MightySat Rx is small and light, weighing less than 100 grams (with batteries), but also durable and long-lasting, with an IP23 ingress rating (protected from water spraying from up to 60 degrees from vertical) and providing approximately 1,800 spot-checks with each set of 2 AAA batteries. Available in both black and white, MightySat offers a high-resolution color display, including display of plethysmographic waveforms, as well as a Bluetooth^® wireless interface to the Masimo Professional Health mobile application to track, trend, and communicate measurements.

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/cpub/clinical-evidence.htm.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
2. Estimate: Masimo data on file.
3. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview. 4. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO2 Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
5. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
6. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
7. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
8. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces U.S. Launch of Iris^® Device Management System

Iris Device Management System Facilitates Remote Management of Masimo Point-of-care Devices Throughout the Hospital

Irvine, California – January 22, 2019 – Masimo (NASDAQ: MASI) announced today the U.S. launch of Iris^® Device Management System (Iris DMS), an automation and connectivity solution designed to streamline management of Masimo devices used throughout a hospital system.

Iris DMS is designed to address the challenges of maintaining many patient monitors in a complex hospital environment. Iris DMS securely connects over a hospital's existing network to all connected Masimo devices to provide an easy-to-use dashboard that allows Biomedical Engineers and IT professionals to view detailed diagnostic information about connected Masimo devices at a glance, without the need to physically interact with each device. Iris DMS supports remote software upgrades to ensure all devices stay up to date, easily and efficiently. Patient profiles, policy files, and network settings can be distributed to multiple devices in a single step, simplifying device management. In addition, connected devices routinely "ping" Iris DMS, allowing users to quickly identify any operational issues with any single Masimo device using the intuitive display of near real-time connection status.

Joe Kiani, Founder and CEO of Masimo, said, "More and more clinicians are recognizing the benefits of providing continuous Masimo patient monitoring, not just during surgery or in the ICU, but in all medical-surgical wards, especially for patients on opioids. Masimo patient monitoring devices are more powerful and full-featured than ever, but as a result their software is increasingly complex. Just as with consumer tech devices, medical devices now undergo regular iterative software updates as new innovations and features become available – helping prolong their utility and augmenting their abilities – and as security patches are issued. Iris DMS not only helps Biomedical and IT professionals view detailed diagnostic information about connected Masimo devices at a glance, but helps to simplify the process of maintaining, updating, and standardizing these devices, helping clinicians and hospitals stay focused on providing the best patient care using the most up-to-date technology, not worrying about device maintenance. Iris DMS is another great example of Masimo's pursuit of holistic care solutions that improve patient outcomes and reduce costs across the continuum of care."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/cpub/clinical-evidence.htm.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO2 Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
3. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
4. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Masimo Announces Select Preliminary Full-Year 2018 Financial Results and 2019 Outlook

Complete fourth quarter and full year 2018 financial results will be announced on Tuesday, February 26, 2019.

• � Preliminary full year 2018 total revenue, including royalty and other revenue, of approximately $855 to $858 million;
• � Preliminary full year 2018 product revenue of approximately $827 to $830 million;
• � Preliminary full year 2018 shipments of noninvasive technology boards and monitors were approximately 232,000;
• � Preliminary full year 2018 GAAP earnings per diluted share and non-GAAP earnings per diluted share are expected to exceed guidance of $3.37 and $2.92 per diluted share, respectively; and
• � Full year 2019 financial guidance includes product revenue, GAAP earnings per diluted share and non-GAAP earnings per diluted share of approximately $910 million, $3.17 and $3.05, respectively.

Irvine, California, January 9, 2019 - Masimo Corporation (NASDAQ: MASI) today announced select preliminary results for the full year December 29, 2018 and provided estimates for its full year 2019 financial guidance.

Preliminary Fourth Quarter 2018 Results:

Masimo expects that its product revenue for the full year 2018 will range from $827 million to $830 million, which reflects growth of 12.0% to 12.4% and constant currency growth of 11.5% to 11.9%. The Company expects its royalty and other revenue for the year will be approximately $28 million. As a result, Masimo now expects its full year 2018 total revenue, including royalty and other revenue, to range from $855 million to $858 million. Additionally, the Company expects that full year 2018 non-GAAP earnings per share will exceed previously issued financial guidance of $2.92, with guidance alone reflecting 27% growth compared to the full year 2017.

The preliminary financial information presented in this press release is based on Masimo's current expectations and may be adjusted as a result of, among other things, completion of customary annual audit procedures. Management plans to discuss Masimo's complete fourth quarter and full year 2018 financial results after the market closes on Tuesday, February 26, 2019.

2019 Financial Guidance:

The Company provided the following estimates for its full year 2019 financial guidance:

• � Product revenue increasing to $910 million, which reflects reported growth of 9.6% to 10.0% and constant currency growth of 10.5% to 10.9%;
• � GAAP diluted earnings per share increasing to $3.17;
• � Non-GAAP diluted earnings per share increasing to $3.05; and
• � Included in our full year 2019 revenue guidance is approximately $7.0 million of year-over-year currency headwinds.

Supplementary Non-GAAP Financial Information

For additional non-GAAP financial details, please visit the Investor Relations section of the Company's website at www.masimo.com to access Supplementary Financial Information.

Non-GAAP Financial Measures

The non-GAAP financial measures contained herein are a supplement to the corresponding financial measures prepared in accordance with U.S. GAAP. The non-GAAP financial measures presented exclude the items described below. Management believes that adjustments for these items assist investors in making comparisons of period-to-period operating results. Furthermore, management also believes that these items are not indicative of the Company's on-going core operating performance. These non- GAAP financial measures have certain limitations in that they do not reflect all of the costs associated with the operations of the Company's business as determined in accordance with GAAP.

Therefore, investors should consider non-GAAP financial measures in addition to, and not as a substitute for, or as superior to, measures of financial performance prepared in accordance with GAAP. The non-GAAP financial measures presented by the Company may be different from the non-GAAP financial measures used by other companies.

The Company has presented the following non-GAAP measures to assist investors in understanding the Company's core net operating results on an on-going basis: (i) non-GAAP product revenue growth %, (ii) non-GAAP net income, (iii) non-GAAP diluted earnings per share, (iv) non-GAAP gross profit, (v) non-GAAP operating income and (vi) adjusted EBITDA. These non- GAAP financial measures may also assist investors in making comparisons of the Company's core operating results with those of other companies. Management believes non-GAAP product revenue growth %, non-GAAP gross profit, non-GAAP operating income, non-GAAP net income, non-GAAP net income per diluted share and adjusted EBITDA are important measures in the evaluation of the Company's performance and uses these measures to better understand and evaluate our business.

The non-GAAP financial measures reflect adjustments for the following items, as well as the related income tax effects thereof:

Constant currency adjustments.

Some of our sales agreements with foreign customers provide for payment in currencies other than the U.S. Dollar. These foreign currency revenues, when converted into U.S. Dollars, can vary significantly from period to period depending on the average and quarter-end exchange rates during a respective period. We believe that comparing these foreign currency denominated revenues by holding the exchange rates constant with the prior year period is useful to management and investors in evaluating our product revenue growth rates on a period-to-period basis. We anticipate that fluctuations in foreign exchange rates and the related constant currency adjustments for calculation of our product revenue growth rate will continue to occur in future periods.

Acquisition-related costs, including depreciation and amortization.

Depreciation and amortization related to the revaluation of assets and liabilities (primarily intangible assets, property, plant and equipment adjustments, inventory revaluation, lease liabilities, etc.) to fair value through purchase accounting related to value created by the seller prior to the acquisition rather than ongoing costs of operating our core business. As a result, we believe that exclusion of these costs in presenting non-GAAP financial measures provides management and investors a more effective means of evaluating historical performance and projected costs and the potential for realizing cost efficiencies within our core business. Depreciation and amortization related to the revaluation of acquisition related assets and liabilities will generally recur in future periods.

Litigation damages, awards and settlements.

In connection with litigation proceedings arising in the course of our business, we have recorded expenses as a defendant in such proceedings in the form of damages, as well as gains as a plaintiff in such proceedings in the form of litigation awards and settlement proceeds; most recently in connection with our November 2016 settlement agreement with Koninklijke Philips N.V. We believe that exclusion of these gains and losses is useful to management and investors in evaluating the performance of our ongoing operations on a period-to-period basis. In this regard, we note that these expenses and gains are generally unrelated to our core business and/or infrequent in nature.

Realized and unrealized gains or losses from foreign currency transactions.

We are exposed to foreign currency gains or losses on outstanding foreign currency denominated receivables and payables related to certain customer sales agreements, product costs and other operating expenses. As the Company does not actively hedge these currency exposures, changes in the underlying currency rates relative to the U.S. Dollar may result in realized and unrealized foreign currency gains and losses between the time these receivables and payables arise and the time that they are settled in cash.

Since such realized and unrealized foreign currency gains and losses are the result of macro-economic factors and can vary significantly from one period to the next, we believe that exclusion of such realized and unrealized gains and losses are useful to management and investors in evaluating the performance of our ongoing operations on a period-to-period basis. Realized and unrealized foreign currency gains and losses are likely to recur in future periods.

Excess tax benefits from stock-based compensation.

Current authoritative accounting guidance requires that excess tax benefits or costs recognized on stock-based compensation expense be reflected in our provision for income taxes rather than paid-in capital. Since we cannot control or predict when stock option awards will be exercised or the price at which such awards will be exercised, the impact of such guidance can create significant volatility in our effective tax rate from one period to the next. We believe that exclusion of these excess tax benefits or costs is useful to management and investors in evaluating the performance of our ongoing operations on a period-to-period basis. These excess tax benefits or costs will generally recur in future periods as long as we continue to issue equity awards to our employees.

Tax impacts that may not be representative of the ongoing results of our core operations.

From time to time, we record tax benefits relating to the derecognition of uncertain tax positions due to the expiration of the statutes of limitations. During the three months ended September 29, 2018, we recorded a significant tax benefit due to the expiration of the applicable statutes of limitations related to certain non-recurring transactions.

We believe that exclusion of the tax benefit resulting from the expiration of certain statutes of limitations related to non-recurring transactions is useful to management and investors in evaluating the performance of our ongoing operations on a period-to-period basis. In this regard, we note that this tax item is unrelated to our core business and non-recurring in nature.

J.P. Morgan Healthcare Conference on Wednesday, January 9, 2019

Masimo will participate in the J.P. Morgan Healthcare Conference on Wednesday, January 9, 2019 at the Westin St. Francis Hotel in San Francisco, California. Micah Young, Executive Vice President and Chief Financial Officer, will represent the Company in a presentation scheduled for 7:30 a.m. Pacific Time.

A live webcast and replay of the Company's presentation will be available online from the investor relations page of the company's corporate website at www.masimo.com.

Fourth Quarter and Full Year 2018 Financial Results Conference Call on Tuesday, February 26, 2019

The conference call to review Masimo's complete financial results for the fourth quarter ended December 29, 2018 will begin at 1:30 p.m. PT (4:30 p.m. ET) on February 26, 2019 and will be hosted by Joe Kiani, Chairman and Chief Executive Officer, and Micah Young, Executive Vice President and Chief Financial Officer. A live webcast of the conference call will be available online from the investor relations page of the company's corporate website at www.masimo.com.

The dial-in numbers are (888) 520-7182 for domestic callers and +1 (706) 758-3929 for international callers. The reservation code for both dial-in numbers is 6889465. After the live webcast, the call will be available on Masimo's website through March 26, 2019. In addition, a telephonic replay of the call will be available through March 5, 2019. The replay dial-in numbers are (855) 859-2056 for domestic callers and +1 (404) 537-3406 for international callers. Please use reservation code 6889465.

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care by taking noninvasive monitoring to new sites and applications. In 1995, the Company debuted Masimo SET^® Measure-through Motion and Low Perfusion^® pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world. In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®) and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate and perfusion index (PI). In 2014, Masimo introduced Root™, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface. Masimo is also taking an active leadership role in mobile health applications (mHealth) with products such as the Radius-7^® wearable patient monitor and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com.

References
1. Dix et al. Monitoring Cerebral Oxygenation in Neonates: An Update. Frontiers in Pediatrics. 2017.
2. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO₂ Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
3. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
4. Published clinical studies on pulse oximetry and the benefits of Masimo SET^® can be found on our website at http://www.masimo.com. Comparative studies include independent and objective studies which are comprised of abstracts presented at scientific meetings and peer-reviewed journal articles.
5. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
6. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
7. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
8. Estimate: Masimo data on file.
9. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
All statements other than statements of historical facts included in this press release that address activities, events or developments that we expect, believe or anticipate will or may occur in the future are forward-looking statements including, in particular, the statements about our expectations for full fiscal year GAAP and non-GAAP 2018 and 2019 total, product, royalty and other revenues, earnings per diluted share, operating margin, EBITDA, and estimated tax rate, and our long-term outlook; demand for our products; anticipated revenue and earnings growth; our financial condition, results of operations and business generally; expectations regarding our ability to design and deliver innovative new noninvasive technologies and reduce the cost of care; and demand for our technologies. These forward-looking statements are based on management's current expectations and beliefs and are subject to uncertainties and factors, all of which are difficult to predict and many of which are beyond our control and could cause actual results to differ materially and adversely from those described in the forward-looking statements. These risks include, but are not limited to, those related to: our dependence on Masimo SET^® and Masimo rainbow SET™ products and technologies for substantially all of our revenue; any failure in protecting our intellectual property exposure to competitors' assertions of intellectual property claims; the highly competitive nature of the markets in which we sell our products and technologies; any failure to continue developing innovative products and technologies; the lack of acceptance of any of our current or future products and technologies; obtaining regulatory approval of our current and future products and technologies; the risk that the implementation of our international realignment will not continue to produce anticipated operational and financial benefits, including a continued lower effective tax rate; the loss of our customers; the failure to retain and recruit senior management; product liability claims exposure; a failure to obtain expected returns from the amount of intangible assets we have recorded; the maintenance of our brand; the amount and type of equity awards that we may grant to employees and service providers in the future; our ongoing litigation and related matters; and other factors discussed in the "Risk Factors" section of our most recent periodic reports filed with the Securities and Exchange Commission ("SEC"), including our most recent Form 10-K and Form 10-Q, all of which you may obtain for free on the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, even if subsequently made available by us on our website or otherwise. We do not undertake any obligation to update, amend or clarify these forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

Investor Contact: Eli Kammerman
Phone: (949) 297-7077
Email: ekammerman@masimo.com

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.

Julie A. Shimer Ph.D. Joins Masimo's Board Of Directors

Irvine, Calif. – January 07, 2019 – Masimo (NASDAQ: MASI) a global medical technology developer and manufacturer of innovative noninvasive patient monitoring technologies, announced today that Julie A. Shimer, Ph.D. has been appointed to Masimo's Board of Directors.

Dr. Shimer is currently a private investor and has over 30 years of product development experience. Dr. Shimer was President and Chief Executive Officer of Welch Allyn, from March 2007 to April 2012. Prior to Welch Allyn, Dr. Shimer served as President and Chief Executive Officer of Vocera Communications, Inc., from September 2001 through February 2007, also serving on the board of directors. Dr. Shimer also previously held executive positions at 3Com Corporation from January 2000 through August 2001, most recently serving as vice president and general manager of its networking products. Before joining 3Com, she held executive positions at Motorola, Inc., from 1993 through 1999, where she was vice president and general manager for the paging division, and prior to that post, vice president of its semiconductor products section. Dr. Shimer worked for AT&T Bell Laboratories and Bethlehem Steel Company before joining Motorola.

Dr. Shimer is a member of the Board of Directors of Netgear, Inc. (NASDAQ: NTGR), a member of the Board of Directors of Apollo Endosurgery, Inc. (NASDAQ: APEN), a member of the Board of Directors of Windstream Holdings, Corp. (NASDAQ: WIN), and a member of the Board of Directors of Avanos Medical, Inc. (NYSE: AVNS). Dr. Shimer is also a member of the Society of Women Engineers and the Institute of Electrical and Electronics Engineers. Dr. Shimer holds a B.S. degree in Physics from Rensselaer Polytechnic Institute and Master's and Doctorate degrees in Electrical Engineering from Lehigh University.

"We are delighted to welcome Dr. Shimer to Masimo's Board of Directors," said Joe Kiani, Founder, Chairman, and CEO of Masimo. "With her many years of executive leadership and board experience in the medical and communications industries and beyond, as well as her technical expertise and engineering background, she will be an invaluable addition. And I'm particularly excited to have a fellow electrical engineer on our Board."

"I'm honored to join Masimo's Board," said Dr. Shimer. "I've long admired Masimo's commitment to advancing care through innovation and I look forward to contributing to its continued success."

@MasimoInnovates || #Masimo

About Masimo
Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care. In 1995, the company debuted Masimo SET^® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET^® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,¹ improve CCHD screening in newborns,² and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.^3,4,5 Masimo SET^® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,⁶ and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 U.S. News and World Report Best Hospitals Honor Roll.⁷ In 2005, Masimo introduced rainbow^® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb^®), oxygen content (SpOC™), carboxyhemoglobin (SpCO^®), methemoglobin (SpMet^®), Pleth Variability Index (PVi^®), and more recently, Oxygen Reserve Index (ORi™), in addition to SpO₂, pulse rate, and perfusion index (Pi). In 2014, Masimo introduced Root^®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect^® (MOC-9^®) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7^® wearable patient monitor, iSpO₂^® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at www.masimo.com. Published clinical studies on Masimo products can be found at www.masimo.com/cpub/clinical-evidence.htm.

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.
*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.

References
1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO2 Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;Jan 8;338.
3. Taenzer AH et al. Impact of pulse oximetry surveillance on rescue events and intensive care unit transfers: a before-and-after concurrence study. Anesthesiology. 2010:112(2):282-287.
4. Taenzer A et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
6. Estimate: Masimo data on file.
7. http://health.usnews.com/health-care/best-hospitals/articles/best-hospitals-honor-roll-and-overview.

Forward-Looking Statements
This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb^®. These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at www.sec.gov. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Investor Contact:
Eli Kammerman
Phone:(949) 297-7077
Email: ekammerman@masimo.com

Evan Lamb
Masimo
Phone: (949) 396-3376
Email: elamb@masimo.com

Masimo, SET, Signal Extraction Technology, Improving Patient Outcome and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications, rainbow, SpHb, SpOC, SpCO, SpMet, PVI are trademarks or registered trademarks of Masimo.