Artisan reports 4.7% iRhythm (IRTC) holding in amended ownership filing

Rhea-AI Filing Summary

iRhythm Holdings, Inc. received an amended Schedule 13G/A from Artisan-affiliated investment entities reporting their ownership of the company’s common stock. As of the reported date, these entities beneficially own 1,511,992 shares, representing 4.7% of the outstanding common stock, based on 32,219,143 shares outstanding as of October 23, 2025.

The Artisan entities report no sole voting or dispositive power over iRhythm shares, but shared voting power over 1,314,008 shares and shared dispositive power over 1,511,992 shares. They certify the position is held in the ordinary course of business and not for the purpose of changing or influencing control of iRhythm.

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Accepted by SEC EDGAR 02/03/2026 - 02:00 PM Learn about SEC filing dates

FAQ

What stake in iRhythm Holdings (IRTC) does Artisan report in this Schedule 13G/A?

Artisan-affiliated entities report beneficial ownership of 1,511,992 iRhythm shares, equal to 4.7% of the common stock. This percentage is calculated using 32,219,143 shares outstanding as of October 23, 2025, as stated in the filing.

Which Artisan entities are listed as reporting persons for iRhythm (IRTC)?

The filing lists Artisan Partners Asset Management Inc., Artisan Partners Holdings LP, Artisan Investments GP LLC, and Artisan Partners Limited Partnership as reporting persons. These related entities form the investment and holding structure through which the iRhythm shares are beneficially owned.

How much voting and dispositive power does Artisan have over iRhythm (IRTC) shares?

The Artisan entities report no sole voting or dispositive power over iRhythm shares. They disclose shared voting power over 1,314,008 shares and shared dispositive power over 1,511,992 shares, indicating decisions are made collectively rather than by a single reporting entity.

Why did Artisan file an amended Schedule 13G/A on iRhythm (IRTC)?

The amendment reflects updated ownership information as of December 31, 2025, showing a 4.7% beneficial stake. The filing also notes ownership of 5 percent or less of the class, indicating the position is below the 5% threshold that often triggers additional reporting.

Is Artisan’s iRhythm (IRTC) position intended to influence control of the company?

The certification states the securities were acquired and are held in the ordinary course of business and not for changing or influencing control of iRhythm. It further notes they are not held in connection with any transaction having that purpose or effect, aside from certain nomination activities.

What type of investor is Artisan Partners Limited Partnership in relation to iRhythm (IRTC)?

Artisan Partners Limited Partnership is described as an investment adviser registered under section 203 of the Investment Advisers Act of 1940. It acts within a structure where related Artisan entities serve as general partners and holding companies for the reported iRhythm position.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

iRhythm Holdings, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

450056106

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 450056106

1

Names of Reporting Persons

Artisan Partners Asset Management Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,314,008.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,511,992.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,511,992.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.7 %

12

Type of Reporting Person (See Instructions)

HC

Comment for Type of Reporting Person: (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

CUSIP No. 450056106

1

Names of Reporting Persons

Artisan Partners Holdings LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,314,008.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,511,992.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,511,992.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.7 %

12

Type of Reporting Person (See Instructions)

HC

Comment for Type of Reporting Person: (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

CUSIP No. 450056106

1

Names of Reporting Persons

Artisan Investments GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,314,008.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,511,992.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,511,992.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.7 %

12

Type of Reporting Person (See Instructions)

HC

Comment for Type of Reporting Person: (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

CUSIP No. 450056106

1

Names of Reporting Persons

Artisan Partners Limited Partnership

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,314,008.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,511,992.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,511,992.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.7 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: (e) Artisan Partners Limited Partnership is an investment adviser registered under section 203 of the Investment Advisers Act of 1940. (g) Artisan Partners Holdings LP is the sole limited partner of Artisan Partners Limited Partnership and the sole member of Artisan Investments GP LLC; Artisan Investments GP LLC is the general partner of Artisan Partners Limited Partnership; Artisan Partners Asset Management Inc. is the general partner of Artisan Partners Holdings LP.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: iRhythm Holdings, Inc.
(b)	Address of issuer's principal executive offices: 699 8th Street Suite 600, San Francisco, California 94103
Item 2.
(a)	Name of person filing: Artisan Partners Asset Management Inc. ("APAM") Artisan Partners Holdings LP ("Artisan Holdings") Artisan Investments GP LLC ("Artisan Investments") Artisan Partners Limited Partnership ("APLP")
(b)	Address or principal business office or, if none, residence: APAM, Artisan Holdings, Artisan Investments, and APLP are all located at: 875 East Wisconsin Avenue, Suite 800 Milwaukee, WI 53202
(c)	Citizenship: APAM is a Delaware corporation; Artisan Holdings is a Delaware limited partnership; Artisan Investments is a Delaware limited liability company; APLP is a Delaware limited partnership
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 450056106
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,511,992
(b)	Percent of class: 4.7% (based on 32,219,143 shares outstanding as of 10/23/2025)
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: None
	(ii) Shared power to vote or to direct the vote: 1,314,008
	(iii) Sole power to dispose or to direct the disposition of: None
	(iv) Shared power to dispose or to direct the disposition of: 1,511,992
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Artisan Partners Asset Management Inc.

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Executive Vice President of Artisan Partners Asset Management Inc.
Date:	02/03/2026

Artisan Partners Holdings LP

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Executive Vice President of Artisan Partners Asset Management Inc., as the general partner of Artisan Partners Holdings LP
Date:	02/03/2026

Artisan Investments GP LLC

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Vice President of Artisan Investments GP LLC
Date:	02/03/2026

Artisan Partners Limited Partnership

Signature:	/s/ Gregory K. Ramirez
Name/Title:	Gregory K. Ramirez, Vice President of Artisan Investments GP LLC, as the general partner of Artisan Partners Limited Partnership
Date:	02/03/2026

Comments accompanying signature: Exhibit Index Exhibit 1 - Joint Filing Agreement dated 2/3/2026 by and among Artisan Partners Asset Management Inc., Artisan Partners Holdings LP, Artisan Investments GP LLC, and Artisan Partners Limited Partnership.