X0508 4 2024-02-28 0 0000937556 MASIMO CORP MASI 0001228621 KIANI JOE E C/O MASIMO CORPORATION 52 DISCOVERY IRVINE CA 92618 1 1 0 0 CEO and Chairman of the Board 0 Common Stock 2024-02-28 4 A 0 10050 0 A 376105 D Common Stock 2024-02-28 4 F 0 3929 128.70 D 372176 D Common Stock 46818 I By Trust Common Stock 352919 I By Trust Common Stock 359000 I By Trust Common Stock 2250291 I By Trust Common Stock 10366 I See Footnote Common Stock 51735 I By Spouse Non-Qualified Stock Option (Right to Buy) 126.49 2024-03-01 4 A 0 57382 0 A 2034-03-01 Common Stock 57382 57382 D On February 26, 2021, the Reporting Person was granted performance restricted stock units which vested on February 28, 2024 based on the Issuer's achievement of certain FY2023 pre-established performance objectives. These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of shares upon the vesting of certain performance restricted stock units. Shares held in three trusts for which Mr. Kiani is the sole Trustee. Shares held in one trust for which Mr. Kiani is the sole trustee. Shares held in Masimo Retirement Savings Plan. This option was granted on March 1, 2024 and is exercisable as the option vests. The option vests over a five year period, with 20% of the shares subject to the option vesting on each anniversary of the grant date. By: /s/ Micah Young, Attorney-in-Fact 2024-03-01