Security record · archived quarter
ATRC
AtriCure, Inc. · Healthcare · Medical - Instruments & Supplies
16Tracked holders
-1Δ holders
18.32MShares held
$600.37MReported value
+0New positions
−1Exits
Momentum inputs (comparable managers):
holder breadth -5.9% ·
share flow +13.3% ·
net new positions -6.2%
— formula
Concentrated accumulation — rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
Ownership over time
| 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 | — | — |
Who holds it · Q2 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 4.91M | — | $160.78M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 4.91M | — | $160.78M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 4.91M | — | $160.78M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 4.91M | — | $160.78M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | The Vanguard Group ✦ (passive) | 4.91M | — | $160.78M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 4.02M | — | $131.82M | 0.0% | n/c | 1 | SEC ↗ |
| 22 | Wellington Management ✦ | 3.97M | +465.4% | $130.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 23 | Wellington Management ✦ | 3.97M | +465.4% | $130.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 24 | Wellington Management ✦ | 3.97M | +465.4% | $130.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 25 | Wellington Management ✦ | 3.97M | +465.4% | $130.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 26 | Wellington Management ✦ | 3.97M | +465.4% | $130.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 27 | Wellington Management ✦ | 3.97M | +465.4% | $130.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 28 | State Street Global Advisors ✦ (passive) | 1.27M | -0.4% | $41.74M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 29 | Geode Capital Management ✦ (passive) | 1.18M | +1.2% | $38.73M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 30 | Geode Capital Management ✦ (passive) | 1.18M | +1.2% | $38.73M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 31 | Marshall Wace ✦ | 1.01M | +1.1% | $32.94M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 32 | Marshall Wace ✦ | 1.01M | +1.1% | $32.94M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 33 | Marshall Wace ✦ | 1.01M | +1.1% | $32.94M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 34 | Marshall Wace ✦ | 1.01M | +1.1% | $32.94M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 35 | Two Sigma Investments ✦ | 411.91K | -38.3% | $13.50M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 36 | Renaissance Technologies ✦ | 377.70K | +22.7% | $12.38M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 37 | Millennium Management ✦ | 360.06K | -42.2% | $11.80M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 38 | Adage Capital Partners ✦ | 275.00K | 0.0% | $9.01M | 0.0% | Held | 3 | SEC ↗ |
| 39 | Fidelity (FMR) ✦ | 270.29K | — | $8.86M | 0.0% | n/c | 1 | SEC ↗ |
| 40 | Fidelity (FMR) ✦ | 270.29K | — | $8.86M | 0.0% | n/c | 1 | SEC ↗ |
| 41 | Fidelity (FMR) ✦ | 270.29K | — | $8.86M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | Fidelity (FMR) ✦ | 270.29K | — | $8.86M | 0.0% | n/c | 1 | SEC ↗ |
| 43 | Citadel Advisors ✦ | 134.74K | -28.9% | $4.42M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 44 | Citadel Advisors ✦ | 134.74K | -28.9% | $4.42M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 45 | AQR Capital Management ✦ | 67.71K | -19.1% | $2.22M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 46 | AQR Capital Management ✦ | 67.71K | -19.1% | $2.22M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 47 | AQR Capital Management ✦ | 67.71K | -19.1% | $2.22M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 48 | AQR Capital Management ✦ | 67.71K | -19.1% | $2.22M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 49 | T. Rowe Price ✦ | 46.31K | +6.5% | $1.52M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 50 | Norges Bank ✦ (passive) | 10.44K | -82.3% | $342,053 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 51 | 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.
Frequently co-owned
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2025 ·
Methodology ·
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