AtriCure, Inc.
AtriCure, Inc. (ATRC) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ATRC · as of Sep 30, 2025
Ownership Breakdown
222
Institutional Holders
▲ 21 vs Q2
$1.70B
Total Inst. Value
▲ $93.99M vs Q2
50.64M
Shares Outstanding
freeFloat 95.87%
48.14M
13F Shares Held
▼ 781,434 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ATRC largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC surgical & medical instruments & apparatus | 4.84M | 10.18% | 10.18% | $170.64B | Nov 7, 2025 | ▼ 65.3K |
WELLINGTON MANAGEMENT GROUP LLP surgical & medical instruments & apparatus | 4.29M | 9.03% | 9.03% | $151.30B | Nov 14, 2025 | ▲ 322.8K |
BLACKROCK, INC. surgical & medical instruments & apparatus | 4.00M | 8.40% | 8.40% | $140.90B | Nov 12, 2025 | ▼ 25.4K |
ALLIANCEBERNSTEIN L.P. surgical & medical instruments & apparatus | 3.56M | 7.48% | 7.48% | $125.44B | Nov 14, 2025 | ▼ 15.1K |
HOOD RIVER CAPITAL MANAGEMENT LLC surgical & medical instruments & apparatus | 3.05M | 6.40% | 6.40% | $107.36B | Nov 14, 2025 | ▼ 15.5K |
MACQUARIE GROUP LTD surgical & medical instruments & apparatus | 2.29M | 4.81% | 4.81% | $80.70B | Nov 13, 2025 | ▼ 213.8K |
CHAMPLAIN INVESTMENT PARTNERS, LLC surgical & medical instruments & apparatus | 1.98M | 4.16% | 4.16% | $69.73B | Nov 12, 2025 | ▼ 38.5K |
STATE STREET CORP surgical & medical instruments & apparatus | 1.26M | 2.66% | 2.66% | $44.57B | Nov 14, 2025 | ▼ 9.4K |
NEUBERGER BERMAN GROUP LLC surgical & medical instruments & apparatus | 1.19M | 2.50% | 2.50% | $41.97B | Nov 12, 2025 | ▲ 1.4K |
GEODE CAPITAL MANAGEMENT, LLC surgical & medical instruments & apparatus | 1.19M | 2.50% | 2.50% | $41.99B | Nov 12, 2025 | ▲ 9.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+1.47M shares1
New Positions
first time holders25
Decreased
−2.64M shares0
Sold Out
fully exitedNet shares change (top 50)
1.17M
+1.47M / −2.64M
Net new holders
-2
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ATRC insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
8
Buy transactions
2
Sell transactions
4.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Prange Karen director | May 20, 2026 | Sale | 3,000 | $28.65 | $86.0K | 26.4K | Form 4 ↗ |
Prange Karen director | May 18, 2026 | Award | 6,144 | — | — | 29.4K | Form 4 ↗ |
Telman Deborah H director | May 18, 2026 | Award | 6,144 | — | — | 28.3K | Form 4 ↗ |
Yuen Maggie director | May 18, 2026 | Award | 6,144 | — | — | 17.5K | Form 4 ↗ |
Nachman Shlomo director | May 18, 2026 | Award | 6,144 | — | — | 24.7K | Form 4 ↗ |
JOHNSON B KRISTINE director | May 18, 2026 | Award | 6,144 | — | — | 56.0K | Form 4 ↗ |
GROVES REGINA E director | May 18, 2026 | Award | 6,144 | — | — | 39.9K | Form 4 ↗ |
WEHRWEIN SVEN director | May 18, 2026 | Award | 6,144 | — | — | 40.5K | Form 4 ↗ |
WHITE ROBERT S. director | May 18, 2026 | Award | 6,144 | — | — | 128.3K | Form 4 ↗ |
Doraiswamy Vinayak Chief Scientific Officer | May 15, 2026 | Sale | 5,000 | $28.13 | $140.7K | 91.9K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
AtriCure, Inc. (ATRC) is primarily owned by institutional investors, who hold approximately 95.1% of total shares outstanding. Company insiders own approximately 4.13%, while retail and public investors account for the remaining 0.82%.
The largest institutional shareholder of AtriCure, Inc. is VANGUARD GROUP INC, holding approximately 4.84 million shares — equal to 10.18% of outstanding shares — as of September 30, 2025.
A total of 222 institutional investors currently hold ATRC stock, with a combined institutional value of approximately $1.70 billion as of the most recent 13F filing period.
Frequently asked questions
ATRC ownershipAtriCure, Inc. (ATRC) is primarily owned by institutional investors, who hold approximately 95.1% of shares. The largest shareholder is VANGUARD GROUP INC with a 10.18% stake. Company insiders hold 4.13%. Data sourced from SEC Form 13F as of September 30, 2025.