Charles Dadswell - 18 Aug 2025 Form 4 Insider Report for MASIMO CORP (MASI)

Reporting relationship: Director
Issuer ticker: MASI
Reported as of: 18 Aug 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 03 Sep 2025, 17:03:29 UTC
Prior SEC filing: 17 Sep 2024
Next SEC filing: 10 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Micah W. Young, Attorney-In-Fact

Key filing fact

Charles Dadswell filed Form 4 for MASIMO CORP (MASI) on 03 Sep 2025.

Key facts

This page summarizes Charles Dadswell's Form 4 filing for MASIMO CORP (MASI).
0 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 03 Sep 2025, 17:03.

Change

Previous filing in this sequence was filed on 17 Sep 2024.
Current net transaction value: $0.

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 0001575229 Primary reporting owner

Dadswell Charles

Relationship: Director
Address: C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE
Signature: /s/ Micah W. Young, Attorney-In-Fact
Signature date: 03 Sep 2025

Reported derivative securities

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

MASI holding Derivative

Restricted Stock Units

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 0
Date: 18 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,273
Exercise price
Footnotes: F1, F2

MASI holding Derivative

Non-Qualified Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 0
Date: 18 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 5,104
Exercise price: $153.93
Footnotes: 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

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 F2

This RSU award was granted on August 18, 2025 and will vest ratably over four years, with 25% of the award vesting on each anniversary of the grant date.

Footnote F3

This option was granted on August 18, 2025 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.