iRhythm Holdings, Inc. has 12 Schedule 13D or 13G filings on record since 2025-08-13. 5 holders' latest filing reports 5% or more of common stock, $0.001 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| RTW Investments, LP | 6.6% | 2,182,631 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Vanguard Portfolio Management | 5.64% | 1,824,090 | SCHEDULE 13G, 2026-04-28 | 2026-03-31 |
| Vanguard Capital Management | 5.23% | 1,691,483 | SCHEDULE 13G, 2026-04-27 | 2026-03-31 |
| Artisan Partners Asset Management Inc. | 5.1% | 1,660,307 | SCHEDULE 13G, 2026-08-13 | 2026-06-30 |
| Millennium Management LLC | 5.1% | 1,664,203 | SCHEDULE 13G, 2026-03-23 | 2026-03-16 |
| Capital Research Global Investors | 4.7% | 1,506,864 | SCHEDULE 13G/A, 2025-08-13 | 2025-06-30 |
| Sands Capital Management, LLC | 0% | 0 | SCHEDULE 13G/A, 2026-05-08 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-13 | Capital Research Global Investors | 4.7% | SCHEDULE 13G/A |
| 2025-11-13 | Sands Capital Management, LLC | 6.9% | SCHEDULE 13G/A |
| 2026-02-03 | Artisan Partners Asset Management Inc. | 4.7% | SCHEDULE 13G/A |
| 2026-02-13 | Sands Capital Management, LLC | 5.3% | SCHEDULE 13G/A |
| 2026-03-23 | Millennium Management LLC | 5.1% | SCHEDULE 13G |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-27 | Vanguard Capital Management | 5.23% | SCHEDULE 13G |
| 2026-04-28 | Vanguard Portfolio Management | 5.64% | SCHEDULE 13G |
| 2026-05-08 | Sands Capital Management, LLC | 0% | SCHEDULE 13G/A |
| 2026-05-15 | RTW Investments, LP | 5.2% | SCHEDULE 13G |
| 2026-08-13 | Artisan Partners Asset Management Inc. | 5.1% | SCHEDULE 13G |
| 2026-08-14 | RTW Investments, LP | 6.6% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.