Masimo (MASI) director gets new RSU grant and converts prior award

Rhea-AI Filing Summary

Masimo Corp director Timothy J. Scannell received an award of 1,119 restricted stock units (RSUs) on April 23, 2026. On April 29, 2026 he converted 1,225 previously granted RSUs into the same number of common shares, resulting in 2,608 common shares held directly. The 2026 RSUs vest in full on the earlier of the first anniversary of grant or the next annual meeting of stockholders.

Insider Trade Summary

1,225 shares exercised/converted

Mixed 3 txns

Insider Scannell Timothy J

Role null

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	1,225	$0.00	--
Exercise	Common Stock	1,225	$0.00	--
Grant/Award	Restricted Stock Units	1,119	$178.71	$200K

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 2,608 shares (Direct, null)

Footnotes (1)

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. These RSUs were granted on April 29, 2025 and will vest in full on the earlier of the first anniversary of the grant date or the date of the next annual meeting of stockholders following the date of grant. These RSUs were granted on April 23, 2026 and will vest in full on the earlier of the first anniversary of the grant date or the date of the next annual meeting of stockholders following the date of grant.

Key Figures

RSU grant: 1,119 RSUs RSUs converted: 1,225 RSUs Shares held after: 2,608 shares +1 more

4 metrics

RSU grant 1,119 RSUs Awarded April 23, 2026

RSUs converted 1,225 RSUs Converted into 1,225 common shares on April 29, 2026

Shares held after 2,608 shares Common stock directly owned following April 29, 2026 transactions

Grant price reference $178.71 per unit Transaction price per share shown for April 23, 2026 RSU grant

Key Terms

Restricted Stock Units, derivative security, contingent right, annual meeting of stockholders

4 terms

Restricted Stock Units financial

"The transaction table labels the derivative security as "Restricted Stock Units" with underlying common stock."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

derivative security financial

"The transaction code description states "Exercise or conversion of derivative security" for the RSU conversion."

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

contingent right financial

"Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock."

annual meeting of stockholders financial

"The RSUs will vest on the earlier of the first anniversary of grant or the date of the next annual meeting of stockholders."

Form 4 Insider Transactions: What Each Field Means →

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^*

Scannell Timothy J

(Last) (First) (Middle)

C/O MASIMO CORPORATION

52 DISCOVERY

(Street)

IRVINE CALIFORNIA 92618

(City) (State) (Zip)

UNITED STATES

(Country)

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)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/23/2026

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

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

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

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
Common Stock	04/29/2026		M		1,225	A	$0	2,608	D

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)	04/29/2026		M			1,225	(2)	04/29/2035	Common Stock	1,225	$0	0	D
Restricted Stock Units	(1)	04/23/2026		A		1,119		(3)	04/23/2036	Common Stock	1,119	$178.71	2,238	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 or the date of the next annual meeting of stockholders following the date of grant.

3. These RSUs were granted on April 23, 2026 and will vest in full on the earlier of the first anniversary of the grant date or the date of the next annual meeting of stockholders following the date of grant.

Remarks:

	/s/ Micah Young, Attorney-In-Fact	05/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did Masimo (MASI) director Timothy J. Scannell report?

Timothy J. Scannell reported acquiring equity through compensation-related activity. He received 1,119 restricted stock units on April 23, 2026 and, on April 29, 2026, converted 1,225 previously granted RSUs into the same number of Masimo common shares, increasing his direct holdings.

How many Masimo (MASI) shares does Timothy J. Scannell hold after these transactions?

After the reported transactions, Timothy J. Scannell directly holds 2,608 shares of Masimo common stock. This reflects the conversion of 1,225 restricted stock units into common shares on April 29, 2026, combined with his prior holdings as shown in the Form 4 filing.

What restricted stock unit grant did Masimo (MASI) make to director Timothy J. Scannell?

Masimo granted Timothy J. Scannell 1,119 restricted stock units on April 23, 2026. Each RSU represents a contingent right to receive one Masimo common share. According to the disclosure, this award will vest in full on the earlier of one year from grant or the next annual meeting.

When do Timothy J. Scannell’s new Masimo (MASI) RSUs vest?

The RSUs granted to Timothy J. Scannell on April 23, 2026 vest in full on the earlier of the first anniversary of the grant date or the date of the next annual meeting of Masimo stockholders following the grant, according to the footnote in the filing.

Was Timothy J. Scannell’s Masimo (MASI) Form 4 a market purchase or sale?

The Form 4 does not show open‑market purchases or sales. It reports a grant of 1,119 restricted stock units and the conversion of 1,225 previously granted RSUs into common shares, which are compensation and vesting events rather than discretionary market trades.