AtriCure Inc has 10 Schedule 13D or 13G filings on record since 2025-08-12. 6 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| BlackRock, Inc. | 7.8% | 3,862,837 | SCHEDULE 13G/A, 2025-10-17 | 2025-09-30 |
| Wellington Management Group LLP | 6.8% | 3,382,555 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Hood River Capital Management LLC | 6.23% | 3,096,611 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| Vanguard Portfolio Management | 5.51% | 2,744,685 | SCHEDULE 13G, 2026-04-28 | 2026-03-31 |
| AllianceBernstein L.P. | 5.5% | 2,768,365 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Vanguard Capital Management | 5.08% | 2,532,965 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Macquarie Group Limited | 4.6% | 2,289,369 | SCHEDULE 13G/A, 2025-11-13 | 2025-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-12 | Wellington Management Group LLP | 8% | SCHEDULE 13G |
| 2025-08-12 | Macquarie Group Limited | 5.06% | SCHEDULE 13G |
| 2025-10-17 | BlackRock, Inc. | 7.8% | SCHEDULE 13G/A |
| 2025-11-13 | Macquarie Group Limited | 4.6% | SCHEDULE 13G/A |
| 2026-02-17 | Hood River Capital Management LLC | 6.23% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-28 | Vanguard Portfolio Management | 5.51% | SCHEDULE 13G |
| 2026-04-29 | Vanguard Capital Management | 5.08% | SCHEDULE 13G |
| 2026-05-15 | Wellington Management Group LLP | 6.8% | SCHEDULE 13G/A |
| 2026-08-14 | AllianceBernstein L.P. | 5.5% | 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.