Masimo Prices Initial Public Offering

August 8, 2007

IRVINE, Calif., Aug. 8 /PRNewswire-FirstCall/ -- Masimo Corporation, the inventor of Pulse CO-Oximetry and Read-Through Motion and Low Perfusion pulse oximetry, today announced the pricing of its initial public offering of 11,916,626 shares of common stock at a price of $17 per share, 10,416,626 of which are being sold by selling stockholders and the remainder by Masimo. Masimo has granted the underwriters an option to purchase up to an additional 1,787,494 shares of common stock to cover over-allotments, if any. Masimo will not receive any proceeds from the sale of shares by the selling stockholders.

Masimo intends to use the net proceeds from the offering for capital expenditures and the placement of equipment, sales and marketing activities to support the ongoing commercialization of the Masimo SET and Masimo Rainbow SET products, sales force expansion, research and development activities and including support of hardware and software product development and clinical study initiatives. The remainder of the net proceeds will be used for increased working capital and general corporate purposes.

Piper Jaffray & Co., Deutsche Bank Securities Inc. and Citigroup Global Markets Inc. acted as joint book running managers for the offering. Cowen and Company, LLC and Thomas Weisel Partners LLC, acted as co-managers of the offering.

Masimo Corporation common stock will trade on the NASDAQ Global Market under the symbol "MASI." The offering is made only by means of a prospectus, copies of which can be obtained from the Piper Jaffray & Co. Prospectus Department, phone (612) 303-6000.

The registration statement relating to the initial public offering of common shares has been declared effective by the Securities and Exchange Commission. This press release does not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of such common shares in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

About Masimo

Masimo develops innovative monitoring technologies that significantly improve patient care-helping solve "unsolvable" problems. In 1995, the company debuted Read-Through Motion and Low Perfusion pulse oximetry, known as SET and with it substantially reduced false alarms and increased pulse oximetry's ability to detect life-threatening events. More than 100 independent clinical and laboratory studies have confirmed that Masimo SET technology allows clinicians to accurately monitor blood oxygen saturation in critical care situations. Our Masimo SET platform has significantly addressed many of the previous technology limitations, has substantially contributed to improved patient outcomes and has been referred to by several industry sources as the gold standard in pulse oximetry. In 2005, Masimo introduced Masimo Rainbow SET Pulse CO-Oximetry, which, for the first time, noninvasively monitors the level of carbon monoxide and methemoglobin in the blood, allowing early detection and treatment of potentially life-threatening conditions. Founded in 1989, Masimo has the mission of "Improving Patient Outcomes and Reducing Cost of Care by Taking Noninvasive Monitoring to New Sites and Applications." Additional information about Masimo and its products may be found at

Forward-Looking Statements

This press release includes 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 plans, objectives, strategies and prospects regarding, among other things, the financial condition, results of operations and business of ours and our subsidiaries. These forward-looking statements are based on current expectations about future events affecting us and are subject to uncertainties and factors relating to our operations and business environment, all of which are difficult to predict and many of which are beyond our control. Certain factors mentioned in this press release, including the risks outlined under "Risk Factors" in our Prospectus dated August 7, 2007, will be important in determining future results. Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. They can be affected by inaccurate assumptions we might make or by known or unknown risks and uncertainties. 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 the date hereof. We do not undertake any obligation to update, amend or clarify these forward-looking statements or the risk factors contained in our Prospectus dated August 7, 2007, whether as a result of new information, future events or otherwise, except as may be required under the federal securities laws.

Masimo Corporation
Mark de Raad
Executive Vice President and Chief Financial Officer
(949) 297-7041

The Ruth Group
Nick Laudico
(646) 536-7030

Brad Langdale
Chief Marketing Officer
(949) 297-7009

SOURCE Masimo Corporation