Who owns AtriCure (ATRC)
Which tracked institutional funds hold ATRC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ATRC company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
57 tracked funds added or opened ATRC while 45 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ATRC’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes ATRC more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ATRC divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 236 tracked filers holding ATRC, 147 increased or opened the position and 97 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ATRC between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 18
- Point72 Asset Management, L.P.$17M
- Meros Investment Management, LP$5M
- Topline Capital Management, LLC$4M
- ExodusPoint Capital Management, LP$2M
- Susquehanna Portfolio Strategies, LLC$2M
- Assenagon Asset Management S.A.$2M
Full exits 13
- GW&K Investment Management, LLC$27M
- Amundi$6M
- MILLENNIUM MANAGEMENT LLC$5M
- SIT INVESTMENT ASSOCIATES INC$3M
- ACADIAN ASSET MANAGEMENT LLC$3M
- HRT FINANCIAL LP$2M
Largest adds
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$28M
- VANGUARD PORTFOLIO MANAGEMENT LLC$10M
- AQR CAPITAL MANAGEMENT LLC$10M
- BlackRock, Inc.$10M
- NORGES BANK$9M
- Grandeur Peak Global Advisors, LLC$6M
Largest trims
- ALLIANCEBERNSTEIN L.P.$50M
- VOYA INVESTMENT MANAGEMENT LLC$20M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$12M
- Divisadero Street Capital Management, LP$11M
- MORGAN STANLEY$8M
- Hood River Capital Management LLC$8M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 4,474,548 | $125M | 9.1% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 3,495,603 | $98M | 7.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 3,127,195 | $87M | 6.3% | 2026-Q2 |
| Hood River Capital Management LLC trimmed | 2,905,299 | $81M | 5.9% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 2,768,365 | $79M | 5.7% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 2,190,413 | $61M | 4.4% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 1,734,279 | $49M | 3.5% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 1,597,988 | $45M | 3.2% | 2026-Q2 |
| STATE STREET CORP added | 1,389,989 | $39M | 2.8% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 1,333,904 | $37M | 2.7% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,319,687 | $37M | 2.7% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 1,296,209 | $36M | 2.6% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,044,034 | $29M | 2.1% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC trimmed | 947,982 | $27M | 1.9% | 2026-Q2 |
| Champlain Investment Partners, LLC trimmed | 938,567 | $26M | 1.9% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 897,419 | $25M | 1.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 874,370 | $24M | 1.8% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC added | 857,787 | $24M | 1.7% | 2026-Q2 |
| Divisadero Street Capital Management, LP trimmed | 800,931 | $22M | 1.6% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 604,380 | $17M | 1.2% | 2026-Q2 |
| DAFNA Capital Management LLC | 597,431 | $17M | 1.2% | 2026-Q2 |
| Grandeur Peak Global Advisors, LLC added | 587,399 | $16M | 1.2% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 580,621 | $16M | 1.2% | 2026-Q2 |
| First Light Asset Management, LLC trimmed | 567,838 | $16M | 1.2% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 560,824 | $16M | 1.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 544,123 | $15M | 1.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 525,795 | $15M | 1.1% | 2026-Q2 |
| FMR LLC added | 506,357 | $14M | 1.0% | 2026-Q2 |
| OSTERWEIS CAPITAL MANAGEMENT INC added | 501,355 | $14M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 482,043 | $13M | 1.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 457,798 | $13M | 0.9% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 423,106 | $12M | 0.9% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 389,099 | $11M | 0.8% | 2026-Q2 |
| NORGES BANK added | 374,362 | $10M | 0.8% | 2026-Q2 |
| Nuveen, LLC added | 365,825 | $10M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 359,048 | $10M | 0.7% | 2026-Q2 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 351,081 | $10M | 0.7% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 335,541 | $9M | 0.7% | 2026-Q2 |
| First Eagle Investment Management, LLC added | 297,643 | $8M | 0.6% | 2026-Q2 |
| SEI INVESTMENTS CO added | 281,310 | $8M | 0.6% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 266,055 | $7M | 0.5% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 234,100 | $7M | 0.5% | 2026-Q2 |
| WASATCH ADVISORS LP trimmed | 233,604 | $7M | 0.5% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 226,338 | $6M | 0.5% | 2026-Q2 |
| NICHOLAS COMPANY, INC. | 204,595 | $6M | 0.4% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 192,824 | $5M | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 177,339 | $5M | 0.4% | 2026-Q2 |
| Advisors Capital Management, LLC trimmed | 174,496 | $5M | 0.4% | 2026-Q2 |
| Meros Investment Management, LP new | 170,000 | $5M | 0.3% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 160,393 | $5M | 0.3% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 151,835 | $4M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 141,275 | $4M | 0.3% | 2026-Q2 |
| Topline Capital Management, LLC new | 138,490 | $4M | 0.3% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC added | 134,207 | $4M | 0.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 131,853 | $4M | 0.3% | 2026-Q2 |
| PARADIGM CAPITAL MANAGEMENT INC/NY | 123,100 | $3M | 0.2% | 2026-Q2 |
| Allianz Asset Management GmbH | 122,158 | $3M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 104,743 | $3M | 0.2% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 100,000 | $3M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 96,500 | $3M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 94,897 | $3M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 92,858 | $3M | 0.2% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 86,356 | $2M | 0.2% | 2026-Q2 |
| Invesco Ltd. added | 84,847 | $2M | 0.2% | 2026-Q2 |
| HighMark Wealth Management LLC | 83,720 | $2M | 0.2% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC trimmed | 80,089 | $2M | 0.2% | 2026-Q2 |
| Emerald Investment Advisers, LLC added | 79,102 | $2M | 0.2% | 2026-Q2 |
| Bridgewater Associates, LP added | 76,307 | $2M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 73,079 | $2M | 0.1% | 2026-Q2 |
| Riverwater Partners LLC added | 71,596 | $2M | 0.1% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 69,852 | $2M | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 68,243 | $2M | 0.1% | 2026-Q2 |
| UBS Group AG trimmed | 64,186 | $2M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 63,916 | $2M | 0.1% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 62,334 | $2M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 59,668 | $2M | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 58,890 | $2M | 0.1% | 2026-Q2 |
| Granite Investment Partners, LLC new | 58,828 | $2M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 58,432 | $2M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 55,141 | $2M | 0.1% | 2026-Q2 |
| Orion Porfolio Solutions, LLC trimmed | 55,105 | $2M | 0.1% | 2026-Q2 |
| Brevan Howard Capital Management LP added | 54,447 | $2M | 0.1% | 2026-Q2 |
| Knott David M Jr | 51,400 | $1M | 0.1% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 50,582 | $1M | 0.1% | 2026-Q2 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC trimmed | 50,484 | $1M | 0.1% | 2026-Q2 |
| DIVERSIFIED TRUST CO added | 50,222 | $1M | 0.1% | 2026-Q2 |
| B. Metzler seel. Sohn & Co. AG | 49,876 | $1M | 0.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 48,407 | $1M | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 48,160 | $1M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 44,784 | $1M | 0.1% | 2026-Q2 |
| SCOTIA CAPITAL INC. added | 41,495 | $1M | 0.1% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 41,484 | $1M | 0.1% | 2026-Q2 |
| Legal & General Group Plc trimmed | 39,893 | $1M | 0.1% | 2026-Q2 |
| Caption Management, LLC new | 39,168 | $1M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 37,248 | $1M | 0.1% | 2026-Q2 |
| WINTON GROUP Ltd new | 35,800 | $1M | 0.1% | 2026-Q2 |
| Marks Group Wealth Management, Inc added | 34,374 | $962K | 0.1% | 2026-Q2 |
| US BANCORP \DE\ added | 34,131 | $955K | 0.1% | 2026-Q2 |
| EntryPoint Capital, LLC added | 30,831 | $863K | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 30,435 | $852K | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.