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Business Summary
Filings
Ownership
Valuation
Ownership — ATRC
Institutional Holdings
Insider Transactions
US Institutional Ownership
100.0%
Institution
Shares
Value
Ownership %
Change
Filing Date
BlackRock, Inc.
4.47M
$125.0M
8.80%
+431.9K
2026-06-30
WELLINGTON MANAGEMENT GROUP LLP
3.50M
$97.0M
6.87%
+113.0K
2026-06-30
VANGUARD PORTFOLIO MANAGEMENT LLC
3.13M
$87.0M
6.15%
+424.6K
2026-06-30
Hood River Capital Management LLC
2.91M
$81.0M
5.71%
-212.2K
2026-06-30
ALLIANCEBERNSTEIN L.P.
2.77M
$78.0M
5.44%
-490.5K
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
2.19M
$61.0M
4.31%
+34.6K
2026-06-30
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.
1.73M
$48.0M
3.41%
-70.6K
2026-06-30
GOLDMAN SACHS GROUP INC
1.60M
$44.0M
3.14%
-69.2K
2026-06-30
STATE STREET CORP
1.39M
$38.0M
2.73%
+87.8K
2026-06-30
MARSHALL WACE, LLP
1.33M
$37.0M
2.62%
-133.6K
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
1.32M
$36.0M
2.59%
+93.6K
2026-06-30
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
1.30M
$36.0M
2.55%
+1.02M
2026-06-30
DIMENSIONAL FUND ADVISORS LP
1.04M
$29.0M
2.05%
+46.3K
2026-06-30
GW&K Investment Management, LLC
949.5K
$26.0M
1.87%
-13.9K
2026-06-30
NEUBERGER BERMAN GROUP LLC
948.0K
$26.0M
1.86%
-102.3K
2026-06-30
Champlain Investment Partners, LLC
938.6K
$26.0M
1.85%
-32.5K
2026-06-30
BNP PARIBAS ASSET MANAGEMENT Holding S.A.
897.4K
$25.0M
1.76%
-163.4K
2026-06-30
BANK OF AMERICA CORP /DE/
874.4K
$24.0M
1.72%
+105.8K
2026-06-30
Divisadero Street Capital Management, LP
800.9K
$22.0M
1.57%
-359.0K
2026-06-30
Point72 Asset Management, L.P.
604.4K
$16.0M
1.19%
+326.5K
2026-06-30
DAFNA Capital Management LLC
597.4K
$16.0M
1.17%
--
2026-06-30
Grandeur Peak Global Advisors, LLC
587.4K
$16.0M
1.15%
+205.5K
2026-06-30
MASSACHUSETTS FINANCIAL SERVICES CO /MA/
580.6K
$16.0M
1.14%
-4.7K
2026-06-30
First Light Asset Management, LLC
567.8K
$15.0M
1.12%
-161.7K
2026-06-30
Qube Research & Technologies Ltd
560.8K
$15.0M
1.10%
+106.0K
2026-06-30
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