Stockholders are Urged to Vote “FOR” Only Masimo’s Director Nominees, Joe Kiani and Christopher Chavez, on the Updated GOLD Proxy Card

Masimo Corporation (“Masimo” or the “Company”) (NASDAQ: MASI), a global leader in noninvasive monitoring technologies and audio products, today mailed a letter to stockholders in connection with its upcoming Annual Meeting of Stockholders (the “Annual Meeting”) to be held on September 19, 2024, underscoring the importance of stockholders’ vote in determining the future of the Company and value of their investment.

Masimo is urging stockholders to vote “FOR” the Company’s director nominees, Joe Kiani and Christopher Chavez, on the updated GOLD proxy card to protect the Company and the value of their investment. Stockholders of record as of the close of business on August 12, 2024 are entitled to vote at the Annual Meeting.

The full text of the letter follows:

Dear Fellow Masimo Stockholders,

This is the final letter you will receive from us about our September 19^th Annual Meeting – and it’s an important one. Your votes at this meeting carry significant weight and will determine who will lead Masimo and its strategy moving forward. We are appealing to you because leadership matters and we believe the upcoming vote will determine the future value of your investment.

The Future of Masimo Depends on Your Vote

As you consider your vote, we want you to keep in mind the following:

But don’t just take our word for it, listen to the experts. Here’s what they’re saying…

…about Masimo’s Nominees:

• “Mr. Kiani is unbelievable in the number of achievements, innovations that he has created for Masimo. The damage to Masimo will be enormous if he leaves Masimo but the loss to humanity and our patients will be irreparable.” – Dr. Michael Ramsay, Baylor University Medical Center (7.21.24)

• “As a recognised global leader with a track record in patient safety and medical policy leadership I cannot believe that a company with such an exemplary position that Masimo currently enjoys would even contemplate losing such a leader as Joe Kiani.” – Dr. Mike Durkin, Senior Advisor on Patient Safety Policy and Leadership for the NIHR Imperial College Patient Safety Translational Research Centre (7.21.24)

• “What makes Joe remarkable is that his leadership style is not about ego or personal accolades. Instead, his focus has always been on the impact of the technology itself and the lives it can save. This is the essence of why he is integral to Masimo.” – Dr. Mitchell Goldstein, Professor of Pediatrics at Loma Linda University School of Medicine (9.8.24)

• “Shareholders should recognize the qualifications of strong nominees like Chavez, who bring experience to support Masimo’s business momentum and increasing diverse representation.” – Carlos Orta, Florida Politics (8.22.24)

…about Politan’s Nominees:

• “These candidates have no experience in running a med tech company, which makes you question what’s really behind this challenge, how any shareholder could support this, and at what cost.” – Steve Forbes, Forbes (8.13.24)

• “If Politan snags control of the board, Masimo will be led by a three-year-old hedge fund helmed by a vulture investor with no expertise or experience in the med-tech field.” – Hazel Trice Edney, The Citizen (8.12.24)

…about Masimo’s Future:

• “The loss of Masimo’s executive leadership as well as its talented employee base would generate a massive disruption, effectively halting future innovations to the detriment of patients and shareholders.” – Jerry Rogers, RealClearPolicy (9.4.24)

• "...Politan has offered no hints about its own plans to increase the stock’s value, which has added to the speculation that the hedge fund, lacking industry experience, is in over its head, has no viable game plan, would face serious retention issues with a mass exodus of key leaders and engineers, and has been motivated from the outset by the prospect of cashing in on the expected short-term stock price boost resulting from the sale or spinoff of Masimo assets like Sound United." – Dan Ikenson, Forbes (8.29.24)

Joe Kiani and Christopher Chavez are committed to and capable of driving value creation for all stockholders – Politan and its nominees are not.

We recognize that you may not agree with every decision our Board has made, and that there are things you would like to see us do differently. We have heard you and have made commitments in response to your feedback, including a plan to separate Masimo’s consumer business in whichever form maximizes stockholder value as well as expand the Board, which will be fully declassified in 2026. We will continue to listen and act in your best interests. After all, our interests are aligned with yours. We are stockholders of Masimo, and Joe Kiani is Masimo’s largest individual stockholder; no one has more to lose than he does if the Company’s progress is derailed. Our interests are firmly aligned, and we’re dedicated to doing everything we can to ensure Masimo and all our stockholders win for the long term.

The stakes in this vote are high, and you are in control of what happens next. Do not put the future of Masimo and your investment at risk by handing control to Quentin Koffey.

We urge you to vote “FOR” Masimo’s director nominees, Joe Kiani and Christopher Chavez, on the updated GOLD proxy card to protect Masimo’s future and your investment. We are grateful for your ongoing support.

Sincerely,

Craig Reynolds

Bob Chapek

Joe Kiani

For more information on how to protect the value of your investment at Masimo, visit www.ProtectMasimosFuture.com.

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. In addition, Masimo Consumer Audio is home to eight legendary audio brands, including Bowers & Wilkins, Denon, Marantz, and Polk Audio. Our mission is to improve life, 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. ^4-5 Masimo SET ® is estimated to be used on more than 200 million patients in leading hospitals and other healthcare settings around the world, ⁶ and is the primary pulse oximetry at all 10 top U.S. hospitals as ranked in the 2024 Newsweek World’s Best Hospitals listing. 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 ® ), 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 ® , Radius PPG ® , and Radius VSM ™ , 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 ® and the Masimo W1 ® medical watch. Masimo hospital and home automation and connectivity solutions are centered around the Masimo Hospital Automation ™ platform, and include Iris ® Gateway, iSirona ™ , Patient SafetyNet, Replica ® , Halo ION ® , UniView ® , UniView :60 ™ , and Masimo SafetyNet ® . Its growing portfolio of health and wellness solutions includes Radius Tº ® , Masimo W1 Sport, and Masimo Stork ™ . Additional information about Masimo and its products may be found at www.masimo.com . Published clinical studies on Masimo products can be found at https://professional.masimo.com/evidence/featured-studies/feature/.

References

1. Published clinical studies on pulse oximetry and the benefits of Masimo SET ® can be found on our website at 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. McGrath S 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. McGrath S et al. Inpatient Respiratory Arrest Associated With Sedative and Analgesic Medications: Impact of Continuous Monitoring on Patient Mortality and Severe Morbidity. J Patient Saf. 2021; 17(8):557-561.

6. Estimate: Masimo data on file.

7. As ranked in the 2024 Newsweek World’s Best Hospitals listing, available at https://www.newsweek.com/rankings/worlds-best-hospitals-2024/united-states.

Forward-Looking Statements

This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the 2024 Annual Meeting of Stockholders (the “2024 Annual Meeting”) of Masimo and the potential stockholder approval of the Board’s nominees; Masimo’s revenue guidance for full-year 2024 and potential growth; Masimo’s goal of achieving 30% operating margins and doubling earnings within five years; changes to Masimo’s governance, including the composition of Masimo’s Board of Directors and Masimo’s plans to expand the Board; the proposed separation of Masimo’s consumer business, including any potential joint venture or any other potential separation of Masimo’s consumer business, and the expectation that the proposed separation will maximize stockholder value or be the best path for success. These forward-looking statements are based on current expectations about future events affecting Masimo and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond Masimo’s control and could cause its actual results to differ materially and adversely from those expressed in its forward-looking statements as a result of various risk factors, including, but not limited to (i) uncertainties regarding future actions that may be taken by Politan in furtherance of its nomination of director candidates for election at the 2024 Annual Meeting, (ii) the potential cost and management distraction attendant to Politan’s nomination of director nominees at the 2024 Annual Meeting and (iii) factors discussed in the “Risk Factors” section of Masimo’s most recent periodic 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 Masimo believes that the expectations reflected in its forward-looking statements are reasonable, the Company does not know whether its 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. Masimo does not undertake any obligation to update, amend or clarify these statements or the “Risk Factors” contained in the Company’s 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.

Non-GAAP Financial Measure

This press release discusses the Company’s non-GAAP consolidated EPS for the year ending December 28, 2024, which is a supplement to the corresponding measure prepared in accordance with GAAP. Management believes non-GAAP consolidated EPS is an important measure in the evaluation of the Company’s performance and uses this measure to better understand and evaluate its business. Non-GAAP consolidated EPS reflects adjustment for certain items that are described in the Company’s earnings press release for the quarter ended June 29, 2024, which was furnished on a Current Report on Form 8-K filed by the Company on August 6, 2024, and is available here: https://www.sec.gov/Archives/edgar/data/937556/000093755624000062/masi-20240806xex991.htm (the “Q2 Earnings Release”). 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 operating performance. This non-GAAP financial measure has certain limitations in that it does 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 measure presented by the Company may be different from the non-GAAP financial measures used by other companies.

Additional Information Regarding the 2024 Annual Meeting of Stockholders and Where to Find It

On August 15, 2024, the Company filed a revised version of its 2024 proxy statement (the “Revised Proxy Statement”) and has mailed the Revised Proxy Statement to its stockholders of record as of the new August 12, 2024 record date for the 2024 Annual Meeting. Any votes submitted by Masimo stockholders in connection with the 2024 Annual Meeting prior to the filing of the Revised Proxy Statement will not be counted and previous proxies submitted will be disregarded, and therefore, all stockholders will need to resubmit their votes, even if they have previously voted. The Company filed a revised version of the Revised Proxy Statement with the SEC on August 22, 2024, which amended, superseded and replaced in its entirety the Revised Proxy Statement (the “Amended Revised Proxy Statement”). THE COMPANY’S STOCKHOLDERS ARE STRONGLY ENCOURAGED TO READ THE AMENDED REVISED PROXY STATEMENT (AND ANY AMENDMENTS AND SUPPLEMENTS THERETO) AND ACCOMPANYING UPDATED GOLD PROXY CARD AS THEY CONTAIN IMPORTANT INFORMATION. Stockholders may obtain the Amended Revised Proxy Statement and any amendments or supplements thereto and other documents as and when filed by the Company with the SEC without charge from the SEC’s website at www.sec.gov.

Certain Information Regarding Participants

The Company, its directors and certain of its executive officers and employees may be deemed to be participants in connection with the solicitation of proxies from the Company’s stockholders in connection with the matters to be considered at the 2024 Annual Meeting. Information regarding the direct and indirect interests, by security holdings or otherwise, of the Company’s directors and executive officers in the Company is included in the Amended Revised Proxy Statement, which can be found through the SEC’s website at https://www.sec.gov/ix?doc=/Archives/edgar/data/937556/000121390024071554/ea0206756-07.htm, and any changes thereto may be found in any amendments or supplements to the Amended Revised Proxy Statement and other documents as and when filed by the Company with the SEC, which can be found through the SEC’s website at www.sec.gov.

Disclaimer

The Company has neither sought nor obtained the consent from any third party to use any statements or information contained in this press release that have been obtained or derived from statements made or published by such third parties. Any such statements or information should not be viewed as indicating the support of such third parties for the views expressed herein.

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¹ Represents a non-GAAP financial measure. Refer to the heading “Non-GAAP Financial Measure” below for additional detail.

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