[Form 4] Masimo Corporation Insider Trading Activity

Rhea-AI Filing Summary

Michelle Brennan, a director and the Chairman of the Board at Masimo Corporation (MASI), received a grant of 766 restricted stock units (RSUs). Each RSU converts to one share of common stock upon vesting. The RSUs were granted on 04/29/2025, carry no purchase price, and will vest in full on the earlier of the first anniversary of the grant or the next annual meeting of stockholders. After the grant, Ms. Brennan beneficially owns 766 shares attributable to these RSUs in a direct ownership form.

Insights

Corporate Governance Expert

TL;DR: Routine director compensation through RSUs to align interests with shareholders and retain board leadership.

The 766 RSU grant to the board chair is a standard equity-based compensation tool to align the director's incentives with shareholder value. The one-year/next-meeting vesting schedule provides a clear short-term retention incentive. The disclosure is straightforward and contains necessary vesting and conversion details.

Securities Analyst

TL;DR: Minor insider award with limited immediate market impact given the small share count disclosed.

This Form 4 reports a non-derivative award of 766 RSUs exercisable into common shares at no cost upon vesting. The disclosure indicates direct beneficial ownership following the grant. Absent larger grants, sales, or related transactions, this filing is informational and unlikely to be material for investors on its own.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Brennan Michelle

(Last) (First) (Middle)

C/O MASIMO CORPORATION

52 DISCOVERY

(Street)

IRVINE CA 92618

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MASIMO CORP [ MASI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Chairman of the Board

3. Date of Earliest Transaction (Month/Day/Year)
04/29/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	04/29/2025		A		766		(2)	04/29/2035	Common Stock	766	$0	766	D

Explanation of Responses:

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

2. These RSUs were granted on April 29, 2025 and will vest in full on the earlier of the first anniversary of the grant date of the date of the next annual meeting of stockholders following the date of grant.

Remarks:

	/s/ Micah W. Young, Attorney-In-Fact	08/11/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Masimo (MASI) director Michelle Brennan receive?

Michelle Brennan was granted 766 restricted stock units (RSUs), each representing the right to one share of common stock upon vesting.

When were the RSUs granted and when do they vest?

The RSUs were granted on 04/29/2025 and will vest in full on the earlier of the first anniversary of the grant date or the next annual meeting of stockholders.

Does Michelle Brennan pay to receive the RSU shares?

No; the reported price is $0, indicating no purchase price for the RSUs as granted.

How many shares does Michelle Brennan beneficially own following the transaction?

Following the reported transaction, she beneficially owns 766 shares attributable to these RSUs in a direct ownership form.

What is the nature of the security reported on the Form 4?

The security is Restricted Stock Units (RSUs), a non-derivative award that converts to common stock upon vesting.