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Overview
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Business Summary
Filings
Ownership
Valuation
Ownership — ATRA
Institutional Holdings
Insider Transactions
US Institutional Ownership
46.9%
Institution
Shares
Value
Ownership %
Change
Filing Date
EcoR1 Capital, LLC
1.55M
$17.0M
16.44%
+1.45M
2026-06-30
ADAGE CAPITAL PARTNERS GP, L.L.C.
850.0K
$9.0M
9.00%
+150.0K
2026-06-30
Point72 Asset Management, L.P.
687.7K
$7.0M
7.28%
+493.5K
2026-06-30
Redmile Group, LLC
441.7K
$5.0M
4.68%
--
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
247.0K
$2.0M
2.62%
+29.2K
2026-06-30
MACKENZIE FINANCIAL CORP
233.2K
$2.0M
2.47%
-80.4K
2026-06-30
BlackRock, Inc.
84.5K
--
0.89%
+5.4K
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
75.1K
--
0.80%
+9.0K
2026-06-30
STALEY CAPITAL ADVISERS INC
50.0K
--
0.53%
--
2026-06-30
VANGUARD FIDUCIARY TRUST CO
43.0K
--
0.46%
+9.4K
2026-06-30
JANE STREET GROUP, LLC
30.3K
--
0.32%
-3.5K
2026-06-30
STATE STREET CORP
26.5K
--
0.28%
--
2026-06-30
NORTHERN TRUST CORP
16.6K
--
0.18%
+4.3K
2026-06-30
FMR LLC
16.2K
--
0.17%
--
2026-06-30
XTX Topco Ltd
15.3K
--
0.16%
--
2026-06-30
BRIDGEWAY CAPITAL MANAGEMENT, LLC
14.0K
--
0.15%
-18.7K
2026-06-30
MILLENNIUM MANAGEMENT LLC
12.7K
--
0.13%
-35.0K
2026-06-30
CITADEL ADVISORS LLC
10.2K
--
0.11%
-5.4K
2026-06-30
MORGAN STANLEY
9.2K
--
0.10%
+9
2026-06-30
UBS Group AG
4.0K
--
0.04%
-46.1K
2026-06-30
Vanguard Global Advisers, LLC
1.5K
--
0.02%
--
2026-06-30
SBI Securities Co., Ltd.
1.4K
--
0.01%
-170
2026-06-30
JONES FINANCIAL COMPANIES LLLP
803
--
0.01%
+100
2026-06-30
Caitong International Asset Management Co., Ltd
311
--
0.00%
--
2026-06-30
WELLS FARGO & COMPANY/MN
251
--
0.00%
--
2026-06-30
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