Masimo (MASI) director awarded 1,119 RSUs and exercises 1,225 units

Rhea-AI Filing Summary

MASIMO CORP director Wendy E. Lane reported equity compensation activity involving restricted stock units (RSUs). On April 29, 2026, she exercised 1,225 RSUs into the same number of shares of common stock, bringing her direct holdings to 2,608 common shares. This was not an open‑market purchase; it reflects the conversion of a derivative award.

Earlier, on April 23, 2026, Lane received a new grant of 1,119 RSUs, each representing a contingent right to one share of common stock. According to the terms, these RSUs will vest in full on the earlier of the first anniversary of the grant date or the next annual meeting of stockholders following the grant date.

Insider Trade Summary

1,225 shares exercised/converted

Mixed 3 txns

Insider LANE WENDY E

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

RSUs exercised: 1,225 units Shares held after exercise: 2,608 shares New RSU grant: 1,119 units +2 more

5 metrics

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

Shares held after exercise 2,608 shares Common stock directly owned after April 29, 2026 transaction

New RSU grant 1,119 units Restricted stock units granted on April 23, 2026

RSU holdings after grant 2,238 units Total restricted stock units following April 23, 2026 grant

RSU vesting term (2026 grant) Earlier of 1 year or next meeting Vests on earlier of first anniversary or next annual stockholder meeting

Key Terms

Restricted Stock Units, derivative security, vesting

3 terms

Restricted Stock Units financial

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

"transaction_code_description: Exercise or conversion of derivative security"

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.

vesting financial

"will vest in full on the earlier of the first anniversary of the grant date or the date of the next annual meeting"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

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^*

LANE WENDY E

(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 did Masimo (MASI) director Wendy E. Lane report in this Form 4?

Wendy E. Lane reported equity compensation activity, including exercising 1,225 restricted stock units into common shares and receiving a new grant of 1,119 RSUs. These transactions reflect compensation awards rather than open-market stock purchases or sales.

How many Masimo (MASI) shares does Wendy E. Lane hold after these transactions?

After exercising 1,225 restricted stock units into common stock, Wendy E. Lane directly holds 2,608 shares of Masimo common stock. This figure reflects her position immediately following the April 29, 2026 RSU conversion disclosed in the Form 4.

What are the key terms of Wendy E. Lane’s new Masimo (MASI) RSU grant?

Lane received 1,119 restricted stock units on April 23, 2026. Each RSU represents a right to one Masimo common share and will vest in full on the earlier of the first anniversary of the grant date or the next annual meeting of stockholders following that grant date.

Was Wendy E. Lane’s Masimo (MASI) Form 4 an open-market stock purchase or sale?

The filing shows no open-market purchases or sales. Instead, it records an exercise of 1,225 restricted stock units into common stock and a grant of 1,119 RSUs, both classified as derivative equity compensation transactions rather than market trades.

How many Masimo (MASI) restricted stock units does Wendy E. Lane have after the new grant?

Following the April 23, 2026 grant, Lane is shown with 2,238 restricted stock units in total. This includes the newly awarded 1,119 RSUs and reflects her derivative equity position before the later conversion of 1,225 RSUs into common shares.