AtriCure Ownership | Who Owns AtriCure?

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AtriCure Ownership Summary

AtriCure is owned by 100.80% institutional investors, 3.22% insiders. Vanguard group is the largest institutional shareholder, holding 10.18% of ATRC shares. Delaware Small Cap Core I is the top mutual fund, with 3.99% of its assets in AtriCure shares.

ATRC Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	AtriCure	100.80%	3.22%	-4.03%
Sector	Healthcare Stocks	41.87%	10.80%	47.33%
Industry	Medical Instruments & Supplies Stocks	40.77%	13.85%	45.38%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	4.84M	10.18%	$170.64M
Blackrock	4.62M	9.84%	$105.10M
Wellington management group llp	4.29M	9.03%	$151.30M
Blackrock funding, inc. /de	4.00M	8.40%	$140.90M
Alliancebernstein	3.56M	7.48%	$125.44M
Hood river capital management	3.05M	6.40%	$107.36M
Macquarie group	2.29M	4.81%	$80.70M
Champlain investment partners	1.98M	4.16%	$69.73M
State street	1.26M	2.66%	$44.57M
Neuberger berman group	1.19M	2.50%	$41.97M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Dafna capital management	592.27K	5.16%	$20.88M
First light asset management	890.36K	2.96%	$31.39M
Kent lake capital	250.00K	2.57%	$5.69M
Millrace asset group	70.05K	1.55%	$1.59M
Highmark wealth management	83.72K	1.30%	$2.95M
Hood river capital management	3.05M	1.27%	$107.36M
Riverwater partners	60.32K	0.88%	$2.13M
Perkins capital management	27.75K	0.86%	$978.19K
Alphacentric advisors	26.04K	0.79%	$795.63K
Semanteon capital management, lp	16.00K	0.71%	$564.03K

Top Buyers

Holder	Shares	% Assets	Change
Massachusetts financial services co /ma/	424.68K	0.00%	424.68K
Blackrock	4.62M	0.00%	384.73K
Wellington management group llp	4.29M	0.03%	322.82K
Point72 (difc)	262.06K	0.60%	262.06K
Kent lake capital	250.00K	2.57%	250.00K

Top Sellers

Holder	Shares	% Assets	Change
Fiera capital	-	-	-918.21K
Timessquare capital management	-	-	-854.55K
Loomis sayles & co l p	-	-	-808.42K
Ubs asset management americas	593.34K	0.00%	-609.53K
Jennison associates	-	-	-593.27K

New Positions

Holder	Shares	% Assets	Change	Value
Massachusetts financial services co /ma/	424.68K	0.00%	424.68K	$14.97M
Kent lake capital	250.00K	2.57%	250.00K	$5.69M
Norges bank	111.95K	0.00%	111.95K	$3.42M
Grandeur peak global advisors	78.90K	0.37%	78.90K	$2.78M
Lazard asset management	43.01K	0.00%	43.01K	$1.41M

Sold Out

Holder	Change
Global retirement partners	-7.00
Bokf, na	-8.00
Newedge advisors	-10.00
Ifp advisors	-18.00
Stephens consulting	-20.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	210	9.95%	47,939,371	8.74%	100	1.17%	100	7.53%	78	18.18%
Jun 30, 2025	199	-9.95%	48,911,144	-2.70%	102	0.91%	94	-18.26%	72	14.29%
Mar 31, 2025	218	2.35%	50,044,148	7.76%	105	1.09%	112	2.75%	63	-11.27%
Dec 31, 2024	212	6.53%	46,334,587	-5.81%	98	0.90%	108	12.50%	72	-5.26%
Sep 30, 2024	198	-1.00%	49,188,862	-2.90%	104	0.90%	96	-25.58%	75	50.00%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Delaware Small Cap Core I	1.95M	3.99%	118.04K
Macquarie Small Cap Core I	1.89M	3.80%	-141.92K
Hood River Small-Cap Growth Instl	1.64M	3.30%	-20.57K
Vanguard US Total Market Shares ETF	1.48M	2.99%	-
Vanguard Total Stock Mkt Idx Inv	1.46M	2.94%	-30.69K
Champlain Small Company Fund, LLC	1.33M	2.68%	-3.90K
iShares Russell 2000 ETF	1.17M	2.35%	-
Vanguard Small Cap Index	1.14M	2.29%	-7.76K
AB Small Cap Growth A	1.01M	2.03%	-15.02K
AB Discovery Growth A	771.18K	1.55%	-7.92K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 12, 2025	Noznesky Justin J	Chief Mktg & Strategy Officer	Sell	$108.90K
Aug 22, 2025	WEHRWEIN SVEN	-	Sell	$185.00K
Aug 19, 2025	WEHRWEIN SVEN	-	Sell	$180.00K
Aug 06, 2025	GROVES REGINA E	-	Sell	$90.28K
Aug 05, 2025	Doraiswamy Vinayak	Chief Scientific Officer	Sell	$91.45K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	3
2025 Q2	-	1
2025 Q1	-	1
2024 Q4	-	-
2024 Q3	-	1

ATRC Ownership FAQ

Who Owns AtriCure?

AtriCure shareholders are primarily institutional investors at 100.80%, followed by 3.22% insiders and -4.02% retail investors. The average institutional ownership in AtriCure's industry, Medical Instruments & Supplies Stocks, is 40.77%, which AtriCure exceeds.

Who owns the most shares of AtriCure?

AtriCure’s largest shareholders are Vanguard group (4.84M shares, 10.18%), Blackrock (4.62M shares, 9.84%), and Wellington management group llp (4.29M shares, 9.03%). Together, they hold 29.04% of AtriCure’s total shares outstanding.

Does Blackrock own AtriCure?

Yes, BlackRock owns 9.84% of AtriCure, totaling 4.62M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 105.1M$. In the last quarter, BlackRock increased its holdings by 384.73K shares, a 9.09% change.

Who is AtriCure’s biggest shareholder by percentage of total assets invested?

Dafna capital management is AtriCure’s biggest shareholder by percentage of total assets invested, with 5.16% of its assets in 592.27K AtriCure shares, valued at 20.88M$.

Who is the top mutual fund holder of AtriCure shares?

Delaware Small Cap Core I is the top mutual fund holder of AtriCure shares, with 3.99% of its total shares outstanding invested in 1.95M AtriCure shares.

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