Masimo (MASI) director Charles Dadswell files Form 3 showing no holdings

Rhea-AI Filing Summary

Masimo Corporation director files initial ownership report showing no holdings

Masimo Corporation director Charles Dadswell filed an initial Form 3 reporting his relationship to the company as a director. The filing states that no non-derivative or derivative securities of Masimo Corporation are beneficially owned, as noted in the remarks section, which specifies that no securities are beneficially owned.

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

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. Date of Event Requiring Statement (Month/Day/Year)
08/18/2025

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

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)

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

Explanation of Responses:

Remarks:

EX-24 - Power of Attorney

No securities are beneficially owned.

	/s/ Micah W. Young, Attorney-In-Fact	09/03/2025
	** 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

What does the Masimo (MASI) Form 3 filed by Charles Dadswell report?

The Form 3 reports that Charles Dadswell is a director of Masimo Corporation and that he currently has no beneficial ownership of Masimo securities.

Does Masimo director Charles Dadswell report any MASI share ownership on this Form 3?

No. The filing states in the remarks that no securities are beneficially owned, and both the non-derivative and derivative securities tables show no holdings.

What is the relationship of the reporting person to Masimo (MASI)?

The reporting person, Charles Dadswell, is identified as a director of Masimo Corporation and is not listed as an officer or 10% owner.

Are there any transactions disclosed in this Masimo (MASI) Form 3?

No transactions are disclosed. The Form 3 is an initial statement of beneficial ownership and indicates that no Masimo securities are currently beneficially owned.

Who signed the Masimo (MASI) Form 3 on behalf of the reporting person?

The Form 3 is signed by /s/ Micah W. Young, Attorney-In-Fact, under a power of attorney referenced as EX-24.

Why is a power of attorney mentioned in the Masimo (MASI) Form 3?

The remarks reference EX-24 - Power of Attorney, indicating that an attorney-in-fact, Micah W. Young, is authorized to sign the Form 3 on behalf of Charles Dadswell.