William R. Jellison - 11 Aug 2025 Form 4 Insider Report for MASIMO CORP (MASI)

Reporting relationship: Director
Issuer ticker: MASI
Reported as of: 11 Aug 2025
Net transaction value: +$437,940
SEC form: 4
Accepted by SEC: 12 Aug 2025, 16:20:13 UTC
Prior SEC filing: 02 Jul 2025
Next SEC filing: 19 Aug 2025
Source filing: View source filing
Reporting owner signature: /s/ Micah W. Young, Attorney-In-Fact

Key filing fact

William R. Jellison filed Form 4 for MASIMO CORP (MASI) on 12 Aug 2025.

Key facts

This page summarizes William R. Jellison's Form 4 filing for MASIMO CORP (MASI).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 12 Aug 2025, 16:20.

Change

Previous filing in this sequence was filed on 02 Jul 2025.
Current net transaction value: +$437,940.

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 0001189883 Primary reporting owner

Jellison William R

Relationship: Director
Address: C/O MASIMO CORPORATION, 52 DISCOVERY, IRVINE
Signature: /s/ Micah W. Young, Attorney-In-Fact
Signature date: 12 Aug 2025

Reported non-derivative transactions

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

MASI transaction

Common Stock

Purchase

Transaction value: $437,940
Shares: +3,000
Change %: +168%
Price: $145.98
Shares after: 4,790
Date: 11 Aug 2025
Ownership: Direct
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The price reported in Column 4 represents the weighted average price per share of open market purchase transactions. The actual purchase prices ranged from a low of $145.84 per share to a high of $146.00 per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.