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Overview
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Business Summary
Filings
Ownership
Valuation
Ownership — ATRC
Institutional Holdings
Insider Transactions
US Institutional Ownership
94.5%
Institution
Shares
Value
Ownership %
Change
Filing Date
BlackRock, Inc.
4.04M
$115.0M
7.95%
-23.1K
2026-03-31
WELLINGTON MANAGEMENT GROUP LLP
3.38M
$96.0M
6.65%
-535.4K
2026-03-31
ALLIANCEBERNSTEIN L.P.
3.26M
$128.0M
6.41%
-304.7K
2026-03-31
Hood River Capital Management LLC
3.12M
$88.0M
6.13%
+20.9K
2026-03-31
VANGUARD PORTFOLIO MANAGEMENT LLC
2.70M
$77.0M
5.31%
--
2026-03-31
VANGUARD CAPITAL MANAGEMENT LLC
2.16M
$61.0M
4.24%
--
2026-03-31
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.
1.80M
$51.0M
3.55%
--
2026-03-31
GOLDMAN SACHS GROUP INC
1.67M
$47.0M
3.28%
+782.1K
2026-03-31
MARSHALL WACE, LLP
1.47M
$41.0M
2.89%
+554.1K
2026-03-31
STATE STREET CORP
1.30M
$37.0M
2.56%
+59.8K
2026-03-31
GEODE CAPITAL MANAGEMENT, LLC
1.23M
$34.0M
2.41%
+34.6K
2026-03-31
Divisadero Street Capital Management, LP
1.16M
$33.0M
2.28%
+1.15M
2026-03-31
BNP PARIBAS ASSET MANAGEMENT Holding S.A.
1.06M
$30.0M
2.09%
+101.5K
2026-03-31
NEUBERGER BERMAN GROUP LLC
1.05M
$29.0M
2.06%
-36.0K
2026-03-31
DIMENSIONAL FUND ADVISORS LP
997.8K
$28.0M
1.96%
+75.9K
2026-03-31
Champlain Investment Partners, LLC
971.1K
$27.0M
1.91%
-202.5K
2026-03-31
GW&K Investment Management, LLC
963.4K
$27.0M
1.89%
+11.3K
2026-03-31
BANK OF AMERICA CORP /DE/
768.6K
$21.0M
1.51%
+92.8K
2026-03-31
First Light Asset Management, LLC
729.5K
$20.0M
1.43%
-445.9K
2026-03-31
Voya Investment Management LLC
719.6K
$20.0M
1.41%
+7.3K
2026-03-31
MORGAN STANLEY
719.2K
$20.0M
1.41%
+373.0K
2026-03-31
DAFNA Capital Management LLC
597.4K
$17.0M
1.17%
--
2026-03-31
MASSACHUSETTS FINANCIAL SERVICES CO /MA/
585.4K
$16.0M
1.15%
+74.1K
2026-03-31
UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC
555.1K
$15.0M
1.09%
-14.6K
2026-03-31
Qube Research & Technologies Ltd
454.8K
$12.0M
0.89%
+164.3K
2026-03-31
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