iRhythm (IRTC) CEO Blackford adds 178 shares via 2016 ESPP plan

Rhea-AI Filing Summary

iRhythm Holdings, Inc. President and CEO Quentin S. Blackford reported an acquisition of 178 shares of common stock at $96.815 per share. The shares were acquired under the company’s 2016 Employee Stock Purchase Plan for the purchase period from December 1, 2025 through May 31, 2026, in a transaction exempt from Section 16(b) under Rule 16b-3. Following this Plan purchase, he holds 204,333 shares of common stock directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Blackford Quentin S.

Role President and CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	178	$96.815	$17K

Holdings After Transaction: Common Stock — 204,333 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares acquired: 178 shares Acquisition price: $96.815 per share Post-transaction holdings: 204,333 shares +2 more

5 metrics

Shares acquired 178 shares Common stock acquired under 2016 Employee Stock Purchase Plan

Acquisition price $96.815 per share Price for ESPP acquisition on May 29, 2026

Post-transaction holdings 204,333 shares Total common shares directly held after acquisition

ESPP purchase period start December 1, 2025 Start of Employee Stock Purchase Plan purchase period

ESPP purchase period end May 31, 2026 End of Employee Stock Purchase Plan purchase period

Key Terms

2016 Employee Stock Purchase Plan, Section 16(b), Rule 16b-3, Grant, award, or other acquisition

4 terms

2016 Employee Stock Purchase Plan financial

"shares of the Issuer's common stock pursuant to the Issuer's 2016 Employee Stock Purchase Plan"

Section 16(b) regulatory

"This transaction is exempt from Section 16(b) under Rule 16b-3."

A federal rule that requires company insiders—like officers, directors and large shareholders—to return any profits made from buying and selling the company’s stock within a six-month window. It matters to investors because it discourages short-term trades that could exploit non-public information and helps protect outside shareholders by creating a simple, enforceable way to recover unfair gains, much like a rule stopping someone from flipping a limited-edition item for quick profit after getting early access.

Rule 16b-3 regulatory

"This transaction is exempt from Section 16(b) under Rule 16b-3."

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

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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^*

Blackford Quentin S.

(Last) (First) (Middle)

C/O IRHYTHM HOLDINGS, INC.

699 8TH ST #600

(Street)

SAN FRANCISCO CALIFORNIA 94103

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026

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	05/29/2026	05/29/2026	A	V	178(1)	A	$96.815	204,333	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

Explanation of Responses:

1. Mr. Blackford is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the Issuer's 2016 Employee Stock Purchase Plan for the purchase period December 1, 2025 through May 31, 2026. This transaction is exempt from Section 16(b) under Rule 16b-3.

Remarks:

	/s/ Marc Rosenbaum, attorney-in-fact	06/01/2026
	** 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 transaction did iRhythm (IRTC) report for CEO Quentin Blackford?

iRhythm reported that President and CEO Quentin S. Blackford acquired 178 shares of common stock. The shares were obtained under the 2016 Employee Stock Purchase Plan during a defined purchase period, in a transaction exempt from Section 16(b) under Rule 16b-3.

How many iRhythm (IRTC) shares did the CEO acquire and at what price?

Quentin S. Blackford acquired 178 shares of iRhythm common stock at a price of $96.815 per share. This acquisition occurred under the 2016 Employee Stock Purchase Plan and was reported as a grant, award, or other acquisition on the Form 4.

Through what plan were the new iRhythm (IRTC) shares acquired by the CEO?

The CEO acquired the new shares through iRhythm’s 2016 Employee Stock Purchase Plan. The Form 4 notes the purchase period ran from December 1, 2025 through May 31, 2026, and that the transaction is exempt from Section 16(b) under Rule 16b-3.

What are Quentin Blackford’s iRhythm (IRTC) holdings after this Form 4 transaction?

After the reported transaction, Quentin S. Blackford directly holds 204,333 shares of iRhythm common stock. This total includes the 178 shares acquired under the 2016 Employee Stock Purchase Plan as disclosed in the Form 4 filing data.

How is the iRhythm (IRTC) CEO’s share acquisition classified on the Form 4?

The acquisition is coded as transaction type “A,” described as a grant, award, or other acquisition. It is a non-derivative transaction, classified as an acquisition rather than a sale, and is reported as exempt from Section 16(b) under Rule 16b-3.