Masimo EVP granted 10,261 RSUs

Dadswell Charles reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 03/10/2026 - 06:52 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Dadswell Charles reported acquisition or exercise transactions in this Form 4 filing.

MASIMO CORP granted EVP and General Counsel Charles Dadswell 10,261 restricted stock units as equity compensation. Each RSU represents the right to receive one share of common stock upon vesting. The award was granted on March 6, 2026 and will vest in four equal annual installments on each anniversary of the grant date.

Insider Trade Summary

Grant/Award: 10,261 shares

Grant/Award 1 txn

Insider Dadswell Charles

Role EVP, General Counsel

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	10,261	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 10,261 contracts (Direct)

Holdings Before and After: Restricted Stock Units, 0 to 10,261 contracts (Direct)

Footnotes (2)

1. 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.
2. F2. This RSU award was granted on March 6, 2026 and will vest ratably over four years, with 25% of the award vesting on each anniversary of the grant date.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MASIMO CORP (MASI) report for Charles Dadswell?

MASIMO CORP reported that EVP and General Counsel Charles Dadswell received 10,261 restricted stock units. These units are a form of equity compensation that convert into common shares as they vest according to the disclosed four-year vesting schedule.

How many restricted stock units did MASI grant to its EVP and General Counsel?

MASIMO CORP granted 10,261 restricted stock units to EVP and General Counsel Charles Dadswell. Each RSU represents a contingent right to receive one share of Masimo common stock once the specified vesting conditions are satisfied over time.

What does each MASIMO CORP RSU granted to Charles Dadswell represent?

Each RSU granted to Charles Dadswell represents the contingent right to receive one share of MASIMO CORP common stock. The shares are delivered only when the units vest, aligning executive compensation with longer-term company performance and continued service.

What is the vesting schedule for Charles Dadswell’s MASI restricted stock units?

The RSU award granted on March 6, 2026 will vest ratably over four years. Twenty-five percent of the 10,261 units will vest on each anniversary of the grant date, creating four equal annual vesting tranches during the award’s life.

When do the restricted stock units granted to the MASI EVP expire?

The restricted stock units granted to MASIMO CORP’s EVP and General Counsel carry an expiration date of March 6, 2036. This long-dated term supports multi-year alignment, although the actual vesting occurs in four equal installments starting one year after grant.

Is the reported MASIMO CORP Form 4 transaction an open-market stock purchase or sale?

The reported transaction is not an open-market purchase or sale. It is a grant of 10,261 restricted stock units categorized as a grant or award acquisition, reflecting compensation rather than a discretionary trade in MASIMO CORP shares on the market.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Dadswell Charles

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

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)	03/06/2026		A		10,261		(2)	03/06/2036	Common Stock	10,261	$0	10,261	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. This RSU award was granted on March 6, 2026 and will vest ratably over four years, with 25% of the award vesting on each anniversary of the grant date.

Remarks:

	/s/ Micah W. Young, Attorney-In-Fact	03/10/2026
	** 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.