AtriCure Ownership | Who Owns AtriCure?

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AtriCure Ownership Summary

AtriCure is owned by 102.85% institutional investors, 3.23% insiders. Vanguard group is the largest institutional shareholder, holding 9.88% of ATRC shares. Macquarie Small Cap Core I is the top mutual fund, with 4.09% of its assets in AtriCure shares.

ATRC Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	AtriCure	102.85%	3.23%	-6.08%
Sector	Healthcare Stocks	486.50%	11.08%	-397.59%
Industry	Medical Instruments & Supplies Stocks	56.90%	14.82%	28.28%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	4.65M	9.88%	$142.20M
Blackrock	4.62M	9.84%	$105.10M
Blackrock funding, inc. /de	4.02M	8.46%	$131.82M
Alliancebernstein	3.84M	8.14%	$117.21M
Hood river capital management	3.06M	6.44%	$100.31M
Champlain investment partners	2.53M	5.37%	$77.27M
Macquarie group	2.38M	5.04%	$72.59M
State street	1.35M	2.86%	$41.16M
Geode capital management	1.15M	2.44%	$35.18M
Nuveen asset management	1.04M	2.20%	$31.70M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Dafna capital management	592.27K	5.36%	$19.41M
First light asset management	1.02M	4.31%	$33.27M
Kent lake capital	250.00K	2.57%	$5.69M
Millrace asset group	70.05K	1.55%	$1.59M
Hood river capital management	3.06M	1.40%	$100.31M
Highmark wealth management	83.72K	1.34%	$2.74M
Perkins capital management	29.10K	0.96%	$953.67K
Alphacentric advisors	26.04K	0.79%	$795.63K
Knott david m jr	46.44K	0.69%	$1.52M
Riverwater partners	33.66K	0.52%	$1.10M

Top Buyers

Holder	Shares	% Assets	Change
Goldman sachs group	853.71K	0.00%	431.21K
Blackrock	4.62M	0.00%	384.73K
Kent lake capital	250.00K	2.57%	250.00K
Dimensional fund advisors lp	700.21K	0.01%	136.01K
Wcm investment management	327.50K	0.02%	134.15K

Top Sellers

Holder	Shares	% Assets	Change
Fiera capital	-	-	-918.21K
Wellington management group llp	654.50K	0.00%	-889.39K
Timessquare capital management	-	-	-854.55K
Loomis sayles & co l p	-	-	-808.42K
Jennison associates	-	-	-593.27K

New Positions

Holder	Shares	% Assets	Change	Value
Kent lake capital	250.00K	2.57%	250.00K	$5.69M
Norges bank	111.95K	0.00%	111.95K	$3.42M
Lazard asset management	43.01K	0.00%	43.01K	$1.41M
Riverwater partners	33.66K	0.52%	33.66K	$1.10M
Alphacentric advisors	26.04K	0.79%	26.04K	$795.63K

Sold Out

Holder	Change
Global retirement partners	-7.00
Northwestern mutual wealth management	-7.00
Bokf, na	-8.00
Newedge advisors	-10.00
Ifp advisors	-18.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Jun 30, 2024	200	-12.28%	50,659,868	2.60%	107	0.97%	129	12.17%	50	-38.27%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Macquarie Small Cap Core I	2.03M	4.09%	-
Delaware Small Cap Core I	1.95M	3.99%	118.04K
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	1.34M	2.69%	-14.53K
iShares Russell 2000 ETF	1.14M	2.30%	-21.73K
Vanguard Small Cap Index	1.14M	2.29%	-7.76K
AB Small Cap Growth A	1.02M	2.06%	-14.81K
AB Discovery Growth A	779.11K	1.57%	-8.48K

Recent Insider Transactions

Date	Name	Role	Activity	Value
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
May 28, 2025	Doraiswamy Vinayak	Chief Scientific Officer	Sell	$83.60K
Mar 05, 2025	Prange Karen	-	Sell	$232.53K

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 102.85%, followed by 3.23% insiders and -6.08% retail investors. The average institutional ownership in AtriCure's industry, Medical Instruments & Supplies Stocks, is 56.90%, which AtriCure exceeds.

Who owns the most shares of AtriCure?

AtriCure’s largest shareholders are Vanguard group (4.65M shares, 9.88%), Blackrock (4.62M shares, 9.84%), and Blackrock funding, inc. /de (4.02M shares, 8.46%). Together, they hold 28.18% 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 5.36% of its assets in 592.27K AtriCure shares, valued at 19.41M$.

Who is the top mutual fund holder of AtriCure shares?

Macquarie Small Cap Core I is the top mutual fund holder of AtriCure shares, with 4.09% of its total shares outstanding invested in 2.03M AtriCure shares.

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