# EDGAR Filing Document

**Accession Number:** 0001388658
**File Stem:** 0001104659-26-008634
**Filing Date:** 2026-1
**Character Count:** 5324
**Document Hash:** 76bda10f1d53d5f5dabb04dca56fbc0d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-008634.hdr.sgml**: 20260130

**ACCESSION NUMBER**: 0001104659-26-008634

**CONFORMED SUBMISSION TYPE**: 15-12G

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260130

**DATE AS OF CHANGE**: 20260130

**EFFECTIVENESS DATE**: 20260130

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** iRhythm Holdings, Inc.
- **CENTRAL INDEX KEY:** 0001388658
- **STANDARD INDUSTRIAL CLASSIFICATION:** SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 208149544
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 15-12G
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37918
- **FILM NUMBER:** 26583418

**BUSINESS ADDRESS:**
- **STREET 1:** 699 8TH STREET
- **STREET 2:** SUITE 600
- **CITY:** San Francisco
- **STATE:** CA
- **ZIP:** 94103
- **BUSINESS PHONE:** 415-632-5700

**MAIL ADDRESS:**
- **STREET 1:** 699 8TH STREET
- **STREET 2:** SUITE 600
- **CITY:** San Francisco
- **STATE:** CA
- **ZIP:** 94103

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** iRhythm Technologies, Inc.
- **DATE OF NAME CHANGE:** 20111021

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** IRhythm Technologies, Inc.
- **DATE OF NAME CHANGE:** 20110429

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** IRhythm Technologies Inc
- **DATE OF NAME CHANGE:** 20070201

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 15**

**CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.**

**iRhythm Technologies, Inc.**

(Exact name of registrant as specified in its charter)

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| | | |
|:---|:---|:---|
| **Delaware** | **001-37918** | **20-8149544** |
| (State or other jurisdiction of incorporation or organization) | (Commission File Number) | (I.R.S. Employer Identification No.) |

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**699 8th Street, Suite 600**

**San Francisco, California 94103**

**(415) 632-5700**

(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

**Common Stock, Par Value $0.001 Per Share, of iRhythm Holdings, Inc.\***

(Title of each class of securities covered by this Form)

**None**

(Titles of all other classes of securities for which a duty to file reports under section 13(a) or 15(d) remains)

Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports:

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| | |
|:---|:---|
| Rule 12g-4(a)(1) | ⌧ |
| Rule 12g-4(a)(2) | ◻ |
| Rule 12h-3(b)(1)(i) | ⌧ |
| Rule 12h-3(b)(1)(ii) | ◻ |
| Rule 15d-6 | ◻ |
| Rule 15d-22(b) | ◻ |

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Approximate number of holders of record as of the certification or notice date: 1\*

\* On January 12, 2025, iRhythm Technologies, Inc. ("iRhythm") implemented a new holding company structure in accordance with Section 251(g) of the General Corporation Law of the State of Delaware (the "Holding Company Transaction") pursuant to the Agreement and Plan of Merger and Reorganization, dated as of January 12, 2026 (the "Merger Agreement"), by and among iRhythm, iRhythm Holdings, Inc. (f/k/a LTCM Holdings, Inc.) ("iRhythm Holdings") and LTCM Merger Sub, Inc., a newly-formed Delaware corporation ("Merger Sub"). Pursuant to the Holding Company Transaction, iRhythm merged with and into Merger Sub, a direct wholly owned subsidiary of iRhythm Holdings, with iRhythm surviving as a direct wholly owned subsidiary of iRhythm Technologies. At the Effective Time (as defined in the Merger Agreement), (i) the separate existence of Merger Sub ceased and (ii) each share of iRhythm's common stock, par value $0.001 per share ("iRhythm Common Stock"), issued and outstanding immediately prior to the Effective Time, was automatically converted into one share of iRhythm Holdings common stock, par value $0.001 per share, having the same designation, rights, powers and preferences, and qualifications, limitations and restrictions as a share of iRhythm Common Stock immediately prior to consummation of the Holding Company Transaction. The Holding Company Transaction constitutes a succession for purposes of Rule 12g-3(a) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). This Form 15 relates solely to the reporting obligations of iRhythm under the Exchange Act and does not affect the reporting obligations of iRhythm Holdings, which is the successor to iRhythm under the Exchange Act.

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has caused this certification/notice to be signed on its behalf by the undersigned duly authorized person.

Date: January 30, 2026

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| | | |
|:---|:---|:---|
| **IRHYTHM HOLDINGS, INC.** | **IRHYTHM HOLDINGS, INC.** | **IRHYTHM HOLDINGS, INC.** |
| (in its capacity as successor registrant to iRhythm Technologies, Inc.) | (in its capacity as successor registrant to iRhythm Technologies, Inc.) | (in its capacity as successor registrant to iRhythm Technologies, Inc.) |
| By: | /s/ Daniel Wilson | /s/ Daniel Wilson |
|  | Name: | Daniel Wilson |
|  | Title: | Chief Financial Officer |

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