[Form 3] Masimo Corporation Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Ahmed Omar, CTIO & EVP of Engineering at Masimo Corporation, reports direct ownership of 1,768 common shares and beneficial ownership of 32,060 restricted stock units (RSUs), representing a total potential interest of 33,828 shares. Most RSU grants vest ratably over five years with 20% vesting each anniversary; one grant vests in full on its first anniversary.

Positive

• Detailed disclosure of direct shares and individual RSU grants with explicit vesting schedules

Negative

• No percentage of outstanding shares or dollar value provided, limiting assessment of materiality

Insights

Corporate Governance Expert

TL;DR: Routine insider disclosure that enhances transparency but appears immaterial to shareholders absent percent ownership or market value.

The Form 3 accurately reports direct holdings and detailed RSU schedules for Ahmed Omar, clarifying his current ownership position and the timing of potential share issuance as RSUs vest. The filing helps stakeholders assess insider alignment with long-term incentives, but it does not provide percent ownership or dollar values, which limits evaluation of materiality relative to total outstanding shares.

Compensation / Equity Analyst

TL;DR: Equity awards are structured as time-based RSUs with multi-year vesting, indicating standard retention incentives rather than immediate dilution.

The reported awards include multiple RSU grants with explicit vesting terms: most grants vest ratably over five years (20% annually) and one vests fully after one year. Total RSUs of 32,060 convert one-for-one to common shares upon vesting. This structure aligns executive reward with continued service, but the filing lacks aggregate dilution metrics to quantify impact on shareholders.

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

Ahmed Omar

(Last) (First) (Middle)

C/O MASIMO CORPORATION

52 DISCOVERY

(Street)

IRVINE CA 92618

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
07/31/2025

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CTIO & EVP of Engineering

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	1,768	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	08/05/2035	Common Stock	1,231	(2)	D
Restricted Stock Units	(3)	03/13/2035	Common Stock	6,638	(2)	D
Restricted Stock Units	(4)	11/13/2034	Common Stock	2,474	(2)	D
Restricted Stock Units	(5)	12/04/2033	Common Stock	10,745	(2)	D
Restricted Stock Units	(6)	03/21/2033	Common Stock	4,578	(2)	D
Restricted Stock Units	(7)	03/21/2032	Common Stock	5,078	(2)	D
Restricted Stock Units	(8)	03/22/2031	Common Stock	1,316	(2)	D

Explanation of Responses:

1. This RSU award was granted on July 7, 2025 and will vest ratably over five years, with 20% of the award vesting on each anniversary of the grant date.

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

3. This RSU award was granted on March 13, 2025 and will vest ratably over five years, with 20% of the award vesting on each anniversary of the grant date.

4. This RSU award was granted on November 13, 2024 and will vest in full on the first anniversary of the grant date.

5. This RSU award was granted on November 16, 2023 and will vest ratably over five years, with 20% of the award vesting on each anniversary of the grant date.

6. This RSU award was granted on March 8, 2023 and will vest ratably over five years, with 20% of the award vesting on each anniversary of the grant date.

7. This RSU award was granted on February 22, 2022 and will vest ratably over five years, with 20% of the award vesting on each anniversary of the grant date.

8. This RSU award was granted on February 26, 2021 and will vest ratably over five years, with 20% of the award vesting on each anniversary of the grant date.

Remarks:

EX-24 - Power of Attorney

	/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 5 (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

How many common shares does Ahmed Omar directly own according to the Form 3 for MASI?

The filing reports 1,768 shares of Masimo common stock held directly by Ahmed Omar.

How many RSUs does Ahmed Omar beneficially own and how do they convert?

Ahmed Omar beneficially owns 32,060 RSUs, and each RSU represents the contingent right to receive one common share upon vesting.

What are the vesting terms for the RSU grants disclosed in the MASI Form 3?

Most RSU grants vest ratably over five years with 20% vesting on each anniversary; one grant is disclosed as vesting in full on the first anniversary.

What is the total potential share interest reported for Ahmed Omar in the Form 3?

Combining direct shares and RSUs, the filing reports a total potential interest of 33,828 shares.

Does the Form 3 state the percentage ownership or value of the reported holdings?

No. The filing lists share counts and RSU quantities and vesting terms but does not provide percentage ownership or dollar values.