As of November 6, 2026, iRhythm Holdings, Inc. is a publicly traded company (Nasdaq: IRTC); its largest reported holder is RTW Investments, with 6.6% on Schedule 13G/A of August 14, 2026, then Vanguard (5.64%). The largest insider holding is Quentin S. Blackford, the chief executive and president, with 226,008 shares (0.67% of shares outstanding), per Form 4 of August 11, 2026 (Schedule 13G/A, August 14, 2026).
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Is iRhythm Holdings, Inc. a real, registered company?
- iRhythm Holdings, Inc. files with the SEC under CIK 1388658 (its SEC filings).
- Its shares are listed under the ticker IRTC on Nasdaq (SEC company record).
- business address in San Francisco, California, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under iRhythm Holdings, Inc. in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Brian Yoor, Director (Form 8-K filed 2026-08-13). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names RTW Investments (filed 2026-08-14).
Who are iRhythm Holdings, Inc.'s owners and officers?
iRhythm Holdings, Inc.: business address in San Francisco, California; industry Surgical & Medical Instruments & Apparatus (Schedule 13G/A, 2026-10-13).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-13 | Millennium Management LLC | 1.1% |
| Schedule 13G/A, 2026-08-14 | Rtw Investments, LP | 6.6% |
| Schedule 13G, 2026-08-13 | Artisan Partners Asset Management Inc. | 5.1% |
| Schedule 13G, 2026-05-15 | Rtw Investments, LP | 5.2% |
| Schedule 13G/A, 2026-05-08 | Sands Capital Management, LLC | 0% |
| Schedule 13G, 2026-04-28 | Vanguard Portfolio Management | 5.64% |
| Schedule 13G, 2026-04-27 | Vanguard Capital Management | 5.23% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13G, 2026-03-23 | Millennium Management LLC | 5.1% |
| Schedule 13G/A, 2026-02-13 | Sands Capital Management, LLC | 5.3% |
| Schedule 13G/A, 2026-02-03 | Artisan Partners Asset Management Inc. | 4.7% |
| Schedule 13G/A, 2025-11-13 | Sands Capital Management, LLC | 6.9% |
Questions about who owns iRhythm Holdings, Inc.
Who owns iRhythm Holdings, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of iRhythm Holdings, Inc.: Rtw Investments, LP (6.6%, Schedule 13G/A, filed 2026-08-14), Vanguard Portfolio Management (5.64%, Schedule 13G, filed 2026-04-28), Vanguard Capital Management (5.23%, Schedule 13G, filed 2026-04-27) and Artisan Partners Asset Management Inc. (5.1%, Schedule 13G, filed 2026-08-13).
Who are the largest shareholders of iRhythm Holdings, Inc.?
By the share each holder's latest filing reports, the largest holders of iRhythm Holdings, Inc. on this page are Rtw Investments, LP (6.6%), Vanguard Portfolio Management (5.64%) and Vanguard Capital Management (5.23%).
When did Rtw Investments, LP buy into iRhythm Holdings, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Rtw Investments, LP on this page is the Schedule 13G, filed 2026-05-15, reporting 5.2%; its latest, Schedule 13G/A filed 2026-08-14, reports 6.6%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-08-13 | Brian Yoor | Director | departed | 2026-08-12 |
Which insiders own iRhythm Holdings, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and president: 226,008 shares (0.67% of shares outstanding) (Form 4, 2026-08-11).
- , the cbo and chief legal officer: 69,699 shares (0.21% of shares outstanding) (Form 4, 2026-08-11).
- , the chief comm and product officer: 62,125 shares (0.18% of shares outstanding) (Form 4, 2026-08-11).
- , the chief med and sci ofcr executive vice president advtech: 60,116 shares (0.18% of shares outstanding) (Form 4, 2026-08-11).
- , the executive vice president and chief risk officer: 44,621 shares (0.13% of shares outstanding) (Form 4, 2026-08-11).
Shares outstanding: 33,618,146 as of 2026-10-29, from the company's latest SEC cover page.
How much has iRhythm Holdings, Inc. raised?
No fundraising or offering filing from iRhythm Holdings, Inc. is on file with us.
Keep reading
More on iRhythm Holdings, Inc. and the records around it.
iRhythm Holdings, Inc. elsewhere on the record
- 5%+ stake filings Oct 2026
Companies that share a holder
- SANDS CAPITAL MANAGEMENT, LLC also filed stake reports on 1 other company: Samsara Inc. (May 2026)
- Artisan Partners Asset Management Inc. also filed stake reports on 16 other companies: Ascendis Pharma A/S (Aug 2026), AXALTA COATING SYSTEMS LTD. (Aug 2026), RADWARE LTD. (Aug 2026)
- RTW Investments, LP also filed stake reports on 43 other companies: CG Oncology, Inc. (Aug 2026), Kailera Therapeutics, Inc. (Aug 2026), ORUKA THERAPEUTICS, INC. (Aug 2026)
Related pages
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https://mentionfox.com/who-owns/irhythm