ATRC
AtriCure, Inc. · Healthcare · Medical - Instruments & Supplies
Momentum inputs (comparable managers):
holder breadth -7.7% ·
share flow -12.8% ·
net new positions -8.3%
· formula
Broad distribution: falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 99 | +3 | 35.69M | $1.00B | +9 | −7 |
| Q1 2026 | 100 | +5 | 35.01M | $1.03B | +10 | −6 |
| Q4 2025 | 96 | +1 | 36.16M | $1.43B | +2 | n/a |
| Q3 2025 | 17 | -1 | 19.38M | $683.04M | n/a | −2 |
| Q2 2025 | 16 | -1 | 18.32M | $600.37M | n/a | −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 | n/a | −1 |
| Q2 2024 | 13 | n/a | 5.61M | $127.65M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 1.54M | +0.4% | $43.29M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 2 | Geode Capital Management ✦ (passive) | 1.15M | +2.9% | $32.33M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 3 | Two Sigma Investments ✦ | 717.78K | +11.6% | $20.13M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 4 | Marshall Wace ✦ | 451.69K | +0.8% | $12.67M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 5 | Millennium Management ✦ | 354.14K | -62.8% | $9.93M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 6 | Citadel Advisors ✦ | 158.74K | +3.3% | $4.45M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 7 | Norges Bank ✦ (passive) | 158.44K | -14.0% | $4.44M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 8 | D. E. Shaw & Co. ✦ | 117.30K | +11.1% | $3.29M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 9 | Renaissance Technologies ✦ | 98.10K | -42.9% | $2.75M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 10 | AQR Capital Management ✦ | 75.32K | +28.2% | $2.11M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 11 | T. Rowe Price ✦ | 40.33K | +1.2% | $1.13M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | Bridgewater Associates ✦ | 19.68K | -51.2% | $551,967 | 0.0% | ▼ Trim | 2 | 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
| Adage Capital Partners | $3.42M | 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.
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