Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Blackford Quentin S. 2. Issuer Name and Ticker or Trading Symbol iRhythm Holdings, Inc. [IRTC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) C/O IRHYTHM HOLDINGS, INC., 699 8TH ST #600 3. Date of Earliest Transaction (Month/Day/Year) 02/24/2026 (Street) SAN FRANCISCO, CA 94103 4. If Amendment, Date 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 (City) (State) (Zip) 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 02/24/2026 02/24/2026 A 46,687(1) A $ 0 211,666 D Common Stock 02/25/2026 02/25/2026 S 25,540(2) D $135.4189 186,126 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 Underlying Securities (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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Blackford Quentin S. C/O IRHYTHM HOLDINGS, INC. 699 8TH ST #600 SAN FRANCISCO, CA 94103	X		President and CEO

Signatures

/s/ Marc Rosenbaum, attorney-in-fact		02/26/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Represents the acquisition of shares upon the determination of the Compensation & Human Capital Management Committee of the Board of Directors of the Issuer that the performance conditions were met with respect to performance Restricted Stock Units ("RSUs") granted to the Reporting Person on February 27, 2023.
(2)	These shares were sold to cover tax withholding and remittance obligations in connection with the vesting of performance RSUs.
Remarks: On January 12, 2026, iRhythm Technologies, Inc. (iRhythm Tech) and iRhythm Holdings, Inc. (Issuer) effectuated a holding company reorganization pursuant to which the Issuer became the successor issuer to iRhythm Tech pursuant to Rule 12g-3(a) of the Securities Exchange Act of 1934, as amended. On such date, all outstanding shares and equity awards of iRhythm Tech automatically converted into securities of the Issuer on a one for one basis, with no change to the proportionate interests of security holders.

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