ATRICURE INC (ATRC) Institutional Shareholders
ATRICURE INC (ATRC) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $1.47B in ATRC holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of ATRC tracked by InsiderSet, reporting ownership valued at approximately $125.20M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $264.54M, representing an estimated gain of +111.29% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 48% of the total disclosed ATRC value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Wellington Management Group Llp, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in ATRICURE INC (ATRC).
This page ranks the largest institutional ATRC shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
241
Total Reported Value
$1.47B
Largest Holder
Blackrock, Inc.
Largest Position
$125.20M
Insider Transactions (90d)
14
Latest Filing Quarter
Q2 2026
New Institutional Positions
61
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 4,474,548 | $125,197,854 | $264,535,278 | +$139,337,424 | +111.29% | |
| Wellington Management Group Llp | 0.02% | 3,495,603 | $97,806,972 | $206,660,049 | +$108,853,077 | +111.29% | |
| Vanguard Portfolio Management Llc | 0.00% | 3,127,195 | $87,498,916 | $184,879,768 | +$97,380,852 | +111.29% | |
| Hood River Capital Management Llc | 0.59% | 2,905,299 | $81,290,266 | $171,761,277 | +$90,471,011 | +111.29% | |
| Alliancebernstein L.P. | 0.03% | 2,768,365 | $78,981,453 | $163,665,739 | +$84,684,286 | +107.22% | |
| Vanguard Capital Management Llc | 0.00% | 2,190,413 | $61,287,756 | $129,497,217 | +$68,209,461 | +111.29% | |
| Nomura Asset Management International Inc. | 0.07% | 1,734,279 | $48,525,000 | $102,530,574 | +$54,005,574 | +111.29% | |
| Goldman Sachs Group Inc | 0.00% | 1,597,988 | $44,711,719 | $94,473,051 | +$49,761,332 | +111.29% | |
| State Street Corp | 0.00% | 1,389,989 | $38,935,240 | $82,176,150 | +$43,240,910 | +111.06% | |
| Marshall Wace, Llp | 0.03% | 1,333,904 | $37,322,635 | $78,860,404 | +$41,537,769 | +111.29% | |
| Geode Capital Management, Llc | 0.00% | 1,319,687 | $36,932,309 | $78,019,895 | +$41,087,586 | +111.25% | |
| Arrowstreet Capital, Limited Partnership | 0.02% | 1,296,209 | $36,267,928 | $76,631,876 | +$40,363,948 | +111.29% | |
| Dimensional Fund Advisors Lp | 0.01% | 1,044,034 | $29,215,881 | $61,723,290 | +$32,507,409 | +111.27% | |
| Neuberger Berman Group Llc | 0.02% | 947,982 | $26,579,656 | $56,044,696 | +$29,465,040 | +110.86% | |
| Gw&K Investment Management, Llc | 0.21% | 949,516 | $26,567,000 | $56,135,386 | +$29,568,386 | +111.30% | |
| Champlain Investment Partners, Llc | 0.67% | 938,567 | $26,261,105 | $55,488,081 | +$29,226,976 | +111.29% | |
| Bnp Paribas Asset Management Holding S.A. | 0.03% | 897,419 | $25,109,784 | $53,055,411 | +$27,945,627 | +111.29% | |
| Bank Of America Corp | 0.00% | 874,370 | $24,464,872 | $51,692,754 | +$27,227,882 | +111.29% | |
| Kennedy Capital Management Llc | 0.42% | 857,787 | $24,000,880 | $50,712,367 | +$26,711,487 | +111.29% | |
| Divisadero Street Capital Management, Lp | 0.52% | 800,931 | $22,410,049 | $47,351,041 | +$24,940,992 | +111.29% | |
| Point72 Asset Management, L.P. | 0.03% | 604,380 | $16,910,552 | $35,730,946 | +$18,820,394 | +111.29% | |
| Dafna Capital Management Llc | 3.19% | 597,431 | $16,716,119 | $35,320,121 | +$18,604,002 | +111.29% | |
| Grandeur Peak Global Advisors, Llc | 3.80% | 587,399 | $16,435,424 | $34,727,029 | +$18,291,605 | +111.29% | |
| Massachusetts Financial Services Co | 0.01% | 580,621 | $16,245,776 | $34,326,314 | +$18,080,538 | +111.29% | |
| First Light Asset Management, Llc | 0.97% | 567,838 | $15,888,107 | $33,570,583 | +$17,682,476 | +111.29% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 555,114 | $15,837,403 | $32,818,340 | +$16,980,937 | +107.22% | |
| Qube Research & Technologies Ltd | 0.02% | 560,824 | $15,691,856 | $33,155,915 | +$17,464,059 | +111.29% | |
| Aqr Capital Management Llc | 0.01% | 544,123 | $15,224,572 | $32,168,552 | +$16,943,980 | +111.29% | |
| Two Sigma Investments, Lp | 0.01% | 525,795 | $14,711,744 | $31,085,000 | +$16,373,256 | +111.29% | |
| Fmr Llc | 0.00% | 506,357 | $14,167,874 | $29,935,826 | +$15,767,952 | +111.29% | |
| Osterweis Capital Management Inc | 0.66% | 501,355 | $14,027,913 | $29,640,108 | +$15,612,195 | +111.29% | |
| Northern Trust Corp | 0.00% | 482,043 | $13,487,563 | $28,498,382 | +$15,010,819 | +111.29% | |
| Morgan Stanley | 0.00% | 457,798 | $12,809,189 | $27,065,018 | +$14,255,829 | +111.29% | |
| Charles Schwab Investment Management Inc | 0.00% | 423,106 | $11,838,506 | $25,014,027 | +$13,175,521 | +111.29% | |
| Panagora Asset Management Inc | 0.03% | 389,099 | $10,886,990 | $23,003,533 | +$12,116,543 | +111.29% | |
| Norges Bank | 0.00% | 374,362 | $10,474,649 | $22,132,281 | +$11,657,632 | +111.29% | |
| Nuveen, Llc | 0.00% | 365,825 | $10,235,784 | $21,627,574 | +$11,391,790 | +111.29% | |
| Wcm Investment Management, Llc | 0.02% | 351,081 | $10,076,025 | $20,755,909 | +$10,679,884 | +105.99% | |
| Vanguard Fiduciary Trust Co | 0.00% | 359,048 | $10,046,163 | $21,226,918 | +$11,180,755 | +111.29% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.02% | 335,541 | $9,388,437 | $19,837,184 | +$10,448,747 | +111.29% | |
| Hrt Financial Lp | 0.02% | 299,736 | $8,386,000 | $17,720,392 | +$9,334,392 | +111.31% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.01% | 297,643 | $8,328,051 | $17,596,654 | +$9,268,603 | +111.29% |
| Sei Investments Co | 0.01% | 281,310 | $7,871,117 | $16,631,047 | +$8,759,930 | +111.29% | |
| Raymond James Financial Inc | 0.00% | 266,055 | $7,444,218 | $15,729,172 | +$8,284,954 | +111.29% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 234,100 | $6,550,118 | $13,839,992 | +$7,289,874 | +111.29% |
| Wasatch Advisors Lp | 0.04% | 233,604 | $6,536,240 | $13,810,668 | +$7,274,428 | +111.29% | |
| Universal- Beteiligungs- Und Servicegesellschaft Mbh | 0.01% | 226,338 | $6,332,938 | $13,381,103 | +$7,048,165 | +111.29% | |
| Nicholas Company, Inc. | 0.10% | 204,595 | $5,724,568 | $12,095,656 | +$6,371,088 | +111.29% | |
| D. E. Shaw & Co., Inc. | 0.00% | 192,824 | $5,395,216 | $11,399,755 | +$6,004,539 | +111.29% | |
| Citadel Advisors Llc | 0.00% | 177,339 | $4,961,945 | $10,484,282 | +$5,522,337 | +111.29% |
Frequently asked questions about ATRC
Who owns the most ATRC stock?
The largest holders of ATRC are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ATRICURE INC (ATRC).
Is ATRC widely held by superinvestors?
Many widely followed stocks like ATRC appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ATRC is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.