ATRC
AtriCure, Inc. · Healthcare · Medical - Instruments & Supplies
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 99 | n/a | 35.69M | $1.00B | n/a | n/a |
| Q1 2026 | 100 | n/a | 35.01M | $1.03B | n/a | n/a |
| Q4 2025 | 96 | n/a | 36.16M | $1.43B | n/a | n/a |
| Q3 2025 | 17 | n/a | 19.38M | $683.04M | n/a | n/a |
| Q2 2025 | 16 | n/a | 18.32M | $600.37M | n/a | n/a |
| Q1 2025 | 14 | n/a | 6.98M | $225.02M | n/a | n/a |
| Q4 2024 | 14 | n/a | 5.72M | $174.87M | n/a | n/a |
| Q3 2024 | 12 | n/a | 4.89M | $137.07M | n/a | n/a |
| Q2 2024 | 13 | n/a | 5.61M | $127.65M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 4.91M | n/a | $160.78M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 2 | BlackRock ✦ (passive) | 4.02M | n/a | $131.82M | 0.0% | n/c | 1 | SEC ↗ ×16 |
| 3 | Wellington Management ✦ | 3.97M | +465.4% | $130.07M | 0.0% | ▲ Add | 5 | SEC ↗ ×6 |
| 4 | State Street Global Advisors ✦ (passive) | 1.27M | -0.4% | $41.74M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 5 | Geode Capital Management ✦ (passive) | 1.18M | +1.2% | $38.73M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 6 | Marshall Wace ✦ | 1.01M | +1.1% | $32.94M | 0.0% | ▲ Add | 5 | SEC ↗ ×4 |
| 7 | Two Sigma Investments ✦ | 411.91K | -38.3% | $13.50M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 8 | Renaissance Technologies ✦ | 377.70K | +22.7% | $12.38M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 9 | Millennium Management ✦ | 360.06K | -42.2% | $11.80M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 10 | Adage Capital Partners ✦ | 275.00K | 0.0% | $9.01M | 0.0% | Held | 3 | SEC ↗ |
| 11 | Fidelity (FMR) ✦ | 270.29K | n/a | $8.86M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 12 | Citadel Advisors ✦ | 134.74K | -28.9% | $4.42M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 13 | AQR Capital Management ✦ | 67.71K | -19.1% | $2.22M | 0.0% | ▼ Trim | 5 | SEC ↗ ×4 |
| 14 | T. Rowe Price ✦ | 46.31K | +6.5% | $1.52M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 15 | Norges Bank ✦ (passive) | 10.44K | -82.3% | $342,053 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 16 | D. E. Shaw & Co. ✦ | 7.78K | -69.3% | $254,820 | 0.0% | ▼ Trim | 5 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Point72 Asset Management | $18.01M | was 0.1% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 221 holders, 49.84M shares, $1.41B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold: shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 4.52K sh · $271,140
Director · 5.31K sh · $288,071
Officer · 3.66K sh · $201,135
Officer · 7.76K sh · $407,558
Officer · 9.37K sh · $458,099
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology