Omar Ahmed - 13 Nov 2025 Form 4 Insider Report for MASIMO CORP (MASI)

Reporting relationship: CTIO & EVP of Engineering
Issuer ticker: MASI
Reported as of: 13 Nov 2025
Net transaction value: +$377,112
SEC form: 4
Accepted by SEC: 17 Nov 2025, 21:41:07 UTC
Prior SEC filing: 11 Aug 2025
Source filing: View source filing
Reporting owner signature: /s/ Micah W. Young, Attorney-In-Fact

Key filing fact

Omar Ahmed filed Form 4 for MASIMO CORP (MASI) on 17 Nov 2025.

Key facts

This page summarizes Omar Ahmed's Form 4 filing for MASIMO CORP (MASI).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 17 Nov 2025, 21:41.

Change

Previous filing in this sequence was filed on 11 Aug 2025.
Current net transaction value: +$377,112.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002077034 Primary reporting owner

Ahmed Omar

Relationship: CTIO & EVP of Engineering
Address: C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE
Signature: /s/ Micah W. Young, Attorney-In-Fact
Signature date: 17 Nov 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MASI transaction

Common Stock

Options Exercise

Transaction value: $377,112
Shares: +2,474
Change %: +140%
Price: $152.43
Shares after: 4,242
Date: 13 Nov 2025
Ownership: Direct

MASI transaction

Common Stock

Tax liability

Transaction value: $0
Shares: -974
Change %: -23%
Price: $0.000000
Shares after: 3,268
Date: 13 Nov 2025
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MASI transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -2,474
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 13 Nov 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,474
Exercise price
Footnotes: F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

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 restricted stock units.

Footnote F2

Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of the Issuer upon vesting of the RSU.

Footnote F3

This RSU award was granted on November 13, 2024 and vested in full on November 13, 2025.