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ATRC · AtriCure, Inc. · Shareholders & Ownership

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$58.09 +0.42 (+0.73%)
Market Cap
$2.94B
Shares
50.87M
Volume · Oct 21 118.01K Avg daily vol (3M) 1.07M

Every disclosed holder of ATRC in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns ATRC

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 52,117,559 102.46%
Insiders (Forms 3, 4, 5) 2,021,709 3.97%
13D/G-only blocks 2,289,369 4.50%
Remaining 5,562,343 -10.94%
Registered funds (N-PORT, not summed) 21,174,221 41.63%

Shares outstanding: 50,866,294, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ATRC

# Holder Shares
1
BlackRock, Inc.
13G CIK 2012383 · Holding company · Sep 30, 2026
Rule 13d-1(b), qualified institution, not summed
7,837,484
1.1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
4,474,548
1.2
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,296,745
1.3
iShares Russell 2000 Growth ETF
Fund S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
460,871
1.4
iShares U.S. Medical Devices ETF
Fund S000009419 · Registered fund · Jun 30, 2026
iShares Trust, not summed
237,143
1.5
Master Small Cap Index Series
Fund S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
93,336
2
WELLINGTON MANAGEMENT GROUP LLP
13F CIK 902219 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
3,495,603
3
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,127,195
4
Hood River Capital Management LLC
13F CIK 1578177 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,905,299
4.1
Hood River Small-Cap Growth Fund
Fund S000012813 · Registered fund · Jun 30, 2026
Manager Directed Portfolios, not summed
1,527,073
4.2
Hood River New Opportunities Fund
Fund S000086255 · Registered fund · Jun 30, 2026
Manager Directed Portfolios, not summed
181,394
5
ALLIANCEBERNSTEIN L.P.
13F CIK 1109448 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,768,365
5.1
ALLIANCEBERNSTEIN L.P.
13G CIK 1109448 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
2,768,365
5.2
AB DISCOVERY GROWTH FUND, INC.
Fund S000010117 · Registered fund · Jun 30, 2026
AB DISCOVERY GROWTH FUND, INC., not summed
737,624
5.3
AB Small Cap Growth Portfolio
Fund S000010309 · Registered fund · Jun 30, 2026
AB CAP FUND, INC., not summed
281,103
5.4
Small Cap Core Portfolio
Fund S000051867 · Registered fund · Jun 30, 2026
Bernstein Fund Inc, not summed
115,782
5.5
AB Small Cap Growth Portfolio
Fund S000010435 · Registered fund · Jun 30, 2026
AB VARIABLE PRODUCTS SERIES FUND, INC., not summed
14,504
6
MACQUARIE GROUP LTD
13G CIK 1418333 · Unknown · Sep 30, 2025
Rule 13d-1(b), qualified institution
2,289,369
7
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,190,413
8
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.
13F CIK 921739 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,734,279
8.1
Nomura Small Cap Core Fund
Fund S000002400 · Registered fund · May 29, 2026
Delaware Group Equity Funds V, not summed
1,219,526
9
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,597,988
9.1
Goldman Sachs Small Cap Equity Insights Fund
Fund S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
121,870
9.2
Goldman Sachs Small Cap Growth Insights Fund
Fund S000014930 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
59,926
9.3
Goldman Sachs Small Cap Value Insights Fund
Fund S000014929 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
46,818
9.4
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
46,322
9.5
Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund
Fund S000009355 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
33,162
10
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,519,312
11
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,389,989
11.1
State Street(R) SPDR(R) S&P(R) Health Care Equipment ETF
Fund S000012330 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
90,319
11.2
State Street Institutional Small-Cap Equity Fund
Fund S000001631 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL FUNDS, not summed
57,700
11.3
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
17,300
11.4
State Street(R) SPDR(R) US Small Cap Low Volatility Index ETF
Fund S000039795 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
9,136
11.5
State Street Small-Cap Equity V.I.S. Fund
Fund S000001636 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
2,505
12
MARSHALL WACE, LLP
13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,333,904
13
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,319,687
14
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
13F CIK 1164508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,296,209
15
VANGUARD SMALL-CAP INDEX FUND
Fund S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,102,113
16
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,044,034
16.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
220,013
16.2
U.S. MICRO CAP PORTFOLIO
Fund S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
167,398
16.3
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
125,887
16.4
Dimensional U.S. Core Equity 2 ETF
Fund S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
118,857
16.5
U.S. CORE EQUITY 2 PORTFOLIO
Fund S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
55,730
17
GW&K Investment Management, LLC
13F CIK 1082917 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
949,516
18
NEUBERGER BERMAN GROUP LLC
13F CIK 1465109 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
947,982
18.1
Neuberger Intrinsic Value Fund
Fund S000028676 · Registered fund · May 31, 2026
NEUBERGER BERMAN EQUITY FUNDS, not summed
244,152
18.2
Neuberger Small Cap Growth Fund
Fund S000007839 · Registered fund · May 31, 2026
NEUBERGER BERMAN EQUITY FUNDS, not summed
93,441
19
Champlain Investment Partners, LLC
13F CIK 1315478 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
938,567
19.1
Champlain Small Company Fund
Fund S000005803 · Registered fund · Jun 30, 2026
ADVISORS' INNER CIRCLE FUND II, not summed
383,000
20
BNP PARIBAS ASSET MANAGEMENT Holding S.A.
13F CIK 1520354 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
897,419
21
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
874,370
22
KENNEDY CAPITAL MANAGEMENT LLC
13F CIK 884589 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
857,787
22.1
Kennedy Capital ESG SMID Cap Fund
Fund S000063803 · Registered fund · Jun 30, 2026
INVESTMENT MANAGERS SERIES TRUST II, not summed
29,621
22.2
Kennedy Capital Small Cap Growth Fund
Fund S000076117 · Registered fund · Jun 30, 2026
INVESTMENT MANAGERS SERIES TRUST II, not summed
245
23
Divisadero Street Capital Management, LP
13F CIK 1901865 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
800,931
24
CARREL MICHAEL H
Insider CIK 1230584 · Jul 30, 2026
Director, President, CEO, & Director, issuer-wide
775,434
25
VANGUARD SMALL-CAP GROWTH INDEX FUND
Fund S000002846 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
632,851
26
Point72 Asset Management, L.P.
13F CIK 1603466 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
604,380
27
DAFNA Capital Management LLC
13F CIK 1389933 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
597,431
28
Grandeur Peak Global Advisors, LLC
13F CIK 1569137 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
587,399
28.1
GRANDEUR PEAK GLOBAL OPPORTUNITIES FUND
Fund S000080371 · Registered fund · Jul 31, 2026
Grandeur Peak Global Trust, not summed
208,862
28.2
GRANDEUR PEAK GLOBAL CONTRARIAN FUND
Fund S000080368 · Registered fund · Jul 31, 2026
Grandeur Peak Global Trust, not summed
86,173
28.3
GRANDEUR PEAK GLOBAL REACH FUND
Fund S000080372 · Registered fund · Jul 31, 2026
Grandeur Peak Global Trust, not summed
20,044
28.4
GRANDEUR PEAK GLOBAL STALWARTS FUND
Fund S000080373 · Registered fund · Jul 31, 2026
Grandeur Peak Global Trust, not summed
19,859
28.5
GRANDEUR PEAK GLOBAL MICROCAP FUND
Fund S000080370 · Registered fund · Jul 31, 2026
Grandeur Peak Global Trust, not summed
18,803
29
MASSACHUSETTS FINANCIAL SERVICES CO /MA/
13F CIK 912938 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
580,621
29.1
MFS New Discovery Fund
Fund S000000765 · Registered fund · May 31, 2026
MFS SERIES TRUST I, not summed
341,866
29.2
MFS New Discovery Series
Fund S000002680 · Registered fund · Jun 30, 2026
MFS VARIABLE INSURANCE TRUST, not summed
123,165
29.3
MFS Blended Research Small Cap Equity Fund
Fund S000050659 · Registered fund · May 31, 2026
MFS SERIES TRUST X, not summed
76,928
29.4
MFS Blended Research Small Cap Equity Portfolio
Fund S000008071 · Registered fund · Jun 30, 2026
MFS VARIABLE INSURANCE TRUST III, not summed
19,381
29.5
MFS Global Alternative Strategy Fund
Fund S000019515 · Registered fund · Jul 31, 2026
MFS Series Trust XV, not summed
993
30
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
580,489
31
First Light Asset Management, LLC
13F CIK 1600004 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
567,838
32
Qube Research & Technologies Ltd
13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
560,824
33
AQR CAPITAL MANAGEMENT LLC
13F CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
544,123
33.1
AQR Small Cap Multi-Style Fund
Fund S000040064 · Registered fund · Jun 30, 2026
AQR Funds, not summed
5,440
33.2
AQR Small Cap Momentum Style Fund
Fund S000025644 · Registered fund · Mar 31, 2026
AQR Funds, not summed
1,707
34
TWO SIGMA INVESTMENTS, LP
13F CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
525,795
35
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
506,357
35.1
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
545,392
35.2
Fidelity Enhanced Small Cap Core ETF
Fund S000081807 · Registered fund · Jun 30, 2026
Fidelity Covington Trust, not summed
461,390
35.3
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
257,941
35.4
Fidelity Total Market Index Fund
Fund S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
92,334
35.5
Fidelity Series Total Market Index Fund
Fund S000065248 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
75,647
36
OSTERWEIS CAPITAL MANAGEMENT INC
13F CIK 1007524 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
501,355
36.1
Osterweis Opportunity Fund
Fund S000055531 · Registered fund · Jun 30, 2026
Professionally Managed Portfolios, not summed
353,985
37
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
482,043
37.1
Small Cap Index Fund
Fund S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
25,258
37.2
Small Cap Core Fund
Fund S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
6,623
38
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
457,798
38.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
52
39
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
423,106
39.1
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
237,824
39.2
Schwab Small-Cap Index Fund
Fund S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
121,353
39.3
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
30,151
39.4
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
29,716
40
PANAGORA ASSET MANAGEMENT INC
13F CIK 883677 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
389,099
41
NORGES BANK
13F CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
374,362
42
Nuveen, LLC
13F CIK 1871926 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
365,825
42.1
Nuveen Quant Small Cap Equity Fund
Fund S000005386 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
227,560
42.2
Nuveen Small Cap Blend Index Fund
Fund S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
66,059
42.3
Nuveen Equity Index Fund
Fund S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
33,412
42.4
Nuveen Life Small Cap Equity Fund
Fund S000005093 · Registered fund · Jun 30, 2026
TIAA-CREF Life Funds, not summed
4,728
42.5
TIAA Separate Account VA-1 - Stock Index Account
Fund S000005098 · Registered fund · Jun 30, 2026
TIAA Separate Account VA-1, not summed
1,229
43
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
359,048
44
WCM INVESTMENT MANAGEMENT, LLC
13F CIK 1061186 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
351,081
44.1
WCM Small Cap Growth Fund
Fund S000066862 · Registered fund · Jun 30, 2026
INVESTMENT MANAGERS SERIES TRUST, not summed
16,810
45
Connor, Clark & Lunn Investment Management Ltd.
13F CIK 1596800 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
335,541
46
EQ/AB Small Cap Growth Portfolio
Fund S000009056 · Registered fund · Jun 30, 2026
EQ Advisors Trust, not summed
305,345
47
HRT FINANCIAL LP
13F CIK 1475597 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
299,736
48
First Eagle Investment Management, LLC
13F CIK 1325447 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
297,643
48.1
First Eagle Small Cap Opportunity Fund
Fund S000072438 · Registered fund · Jul 31, 2026
First Eagle Funds, not summed
262,559
49
VANGUARD STRATEGIC EQUITY FUND
Fund S000002593 · Registered fund · Jun 30, 2026
VANGUARD HORIZON FUNDS, not summed
291,716
50
SEI INVESTMENTS CO
13F CIK 350894 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
281,310
50.1
SIIT EXTENDED MARKET INDEX FUND
Fund S000035814 · Registered fund · May 31, 2026
SEI INSTITUTIONAL INVESTMENTS TRUST, not summed
7,920
50.2
New Covenant Growth Fund
Fund S000024941 · Registered fund · Jun 30, 2026
NEW COVENANT FUNDS, not summed
1,029

43 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 392 holders

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Key facts CIK 1323885 CUSIP 04963C209 13F (30d) 32 filings 32 filers Visit website Investor relations