Catherine M. Szyman - 11 Mar 2026 Form 4 Insider Report for MASIMO CORP (MASI)

Role
CEO, Director
Signature
/s/ Micah W. Young, Attorney-In-Fact
Issuer symbol
MASI
Transactions as of
11 Mar 2026
Net transactions value
$0
Form type
4
Filing time
16 Mar 2026, 17:21:00 UTC
Previous filing
10 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Szyman Catherine M. CEO, Director C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE /s/ Micah W. Young, Attorney-In-Fact 16 Mar 2026 0001438538

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MASI Common Stock Options Exercise +2,101 +32% $0.000000* 8,674 11 Mar 2026 Direct F1
transaction MASI Common Stock Tax liability -1,069 -12% $175.47* 7,605 11 Mar 2026 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MASI Restricted Stock Units Options Exercise -2,101 -25% $0.000000* 6,306 11 Mar 2026 Common Stock 2,101 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 As previously reported, the reporting person was granted 8,407 restricted stock units (RSUs) on March 11, 2025 and will vest ratably over four years, 25% of which vested on March 11, 2026.
F2 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 RSUs.
F3 Each RSU represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.