Amendment to Schedule 13G Filing for MASIMO CORP

This filing is an amendment to a Schedule 13G by FMR LLC, a holding company, regarding their beneficial ownership of MASIMO CORP common stock. FMR LLC now holds 2,349,974.52 shares, representing 4.5% of the class. This ownership was acquired in the ordinary course of business and not for the purpose of influencing control of the issuer. The filing also notes that one or more other persons may have the right to receive or direct the receipt of dividends or proceeds from the sale of the common stock, but no single person holds more than five percent.