# EDGAR Filing Document

**Accession Number:** 0001388658
**File Stem:** 0001388658-26-000031
**Filing Date:** 2026-4
**Character Count:** 3302
**Document Hash:** b8fb6f4a34b3cf6ea9bfc2f07b70d62f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001388658-26-000031.hdr.sgml**: 20260417

**ACCESSION NUMBER**: 0001388658-26-000031

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 5

**FILED AS OF DATE**: 20260417

**DATE AS OF CHANGE**: 20260417

**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:** 413421287
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37918
- **FILM NUMBER:** 26872195

**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**

**_______________________________________________________________________________________________________________**

**SCHEDULE 14A**

**PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE**

**SECURITIES EXCHANGE ACT OF 1934**

**_______________________________________________________________________________________________________________**

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| | | |
|:---|:---|:---|
| | Filed by the Registrant ☒ | Filed by a Party other than the Registrant ☐ |
| | Check the appropriate box: | Check the appropriate box: |
| ☐ | Preliminary Proxy Statement | Preliminary Proxy Statement |
| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☐ | Definitive Proxy Statement | Definitive Proxy Statement |
| ☒ | Definitive Additional Materials | Definitive Additional Materials |
| ☐ | Soliciting Material Pursuant to §240.14a-12 | Soliciting Material Pursuant to §240.14a-12 |
|  | **IRHYTHM HOLDINGS, INC.** | **IRHYTHM HOLDINGS, INC.** |
|  | **(Name of Registrant as Specified In Its Charter)** | **(Name of Registrant as Specified In Its Charter)** |
|  | **(Name of Person(s) Filing Proxy Statement, if other than the Registrant)** | **(Name of Person(s) Filing Proxy Statement, if other than the Registrant)** |
|  | Payment of Filing Fee (Check all boxes that apply): | Payment of Filing Fee (Check all boxes that apply): |

---

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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