ATRC
AtriCure, Inc. · Healthcare · Medical - Instruments & Supplies
Momentum inputs (comparable managers):
holder breadth +7.7% ·
share flow -8.2% ·
net new positions +7.1%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 102 | +5 | 36.09M | $1.01B | +10 | −5 |
| Q1 2026 | 100 | +5 | 35.01M | $1.03B | +10 | −6 |
| Q4 2025 | 96 | +1 | 36.16M | $1.43B | +2 | — |
| Q3 2025 | 17 | -1 | 19.38M | $683.04M | — | −2 |
| Q2 2025 | 16 | -1 | 18.32M | $600.37M | — | −1 |
| Q1 2025 | 14 | 0 | 6.98M | $225.02M | +1 | −1 |
| Q4 2024 | 14 | +1 | 5.72M | $174.87M | +2 | −1 |
| Q3 2024 | 12 | -1 | 4.89M | $137.07M | — | −1 |
| Q2 2024 | 13 | — | 5.61M | $127.65M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | State Street Global Advisors ✦ (passive) | 1.35M | — | $41.16M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | Geode Capital Management ✦ (passive) | 1.15M | -0.1% | $35.18M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 3 | Geode Capital Management ✦ (passive) | 1.15M | -0.1% | $35.18M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 4 | Wellington Management ✦ | 654.50K | -57.6% | $20.00M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 5 | Wellington Management ✦ | 654.50K | -57.6% | $20.00M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 6 | Marshall Wace ✦ | 619.17K | +37.1% | $18.92M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 7 | Marshall Wace ✦ | 619.17K | +37.1% | $18.92M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | Marshall Wace ✦ | 619.17K | +37.1% | $18.92M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 9 | Marshall Wace ✦ | 619.17K | +37.1% | $18.92M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 10 | Two Sigma Investments ✦ | 611.00K | -14.9% | $18.67M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 11 | Millennium Management ✦ | 347.84K | -1.8% | $10.63M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 12 | Adage Capital Partners ✦ | 300.00K | New | $9.17M | 0.0% | New | 1 | SEC ↗ |
| 13 | Citadel Advisors ✦ | 194.98K | +22.8% | $5.96M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 14 | Citadel Advisors ✦ | 194.98K | +22.8% | $5.96M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 15 | Renaissance Technologies ✦ | 163.90K | +67.1% | $5.01M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 16 | Norges Bank ✦ (passive) | 111.95K | -29.4% | $3.42M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 17 | AQR Capital Management ✦ | 82.85K | +10.0% | $2.53M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 18 | AQR Capital Management ✦ | 82.85K | +10.0% | $2.53M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 19 | AQR Capital Management ✦ | 82.85K | +10.0% | $2.53M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | AQR Capital Management ✦ | 82.85K | +10.0% | $2.53M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | D. E. Shaw & Co. ✦ | 67.46K | -42.5% | $2.06M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 22 | D. E. Shaw & Co. ✦ | 67.46K | -42.5% | $2.06M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 23 | T. Rowe Price ✦ | 43.60K | +8.1% | $1.33M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 24 | Arrowstreet Capital ✦ | 26.69K | New | $815,738 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Adage Capital Partners | $9.17M | 0.0% |
| Arrowstreet Capital | $815,738 | 0.0% |
Exited
| Bridgewater Associates | $551,967 | was 0.0% |
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.