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Overview
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Business Summary
Filings
Ownership
Valuation
Ownership — ABOS
Institutional Holdings
Insider Transactions
US Institutional Ownership
61.9%
Institution
Shares
Value
Ownership %
Change
Filing Date
RA CAPITAL MANAGEMENT, L.P.
20.99M
$49.0M
29.06%
+6.06M
2026-03-31
Sands Capital Alternatives, LLC
3.72M
$8.0M
5.15%
+303.0K
2026-03-31
Alyeska Investment Group, L.P.
2.45M
$5.0M
3.40%
+1.52M
2026-03-31
FRANKLIN RESOURCES INC
2.31M
$5.0M
3.19%
--
2026-03-31
ADAR1 Capital Management, LLC
2.16M
$5.0M
2.99%
+1.27M
2026-03-31
Knollwood Investment Advisory, LLC
1.63M
$3.0M
2.25%
--
2026-03-31
VANGUARD CAPITAL MANAGEMENT LLC
1.51M
$3.0M
2.09%
--
2026-03-31
FMR LLC
1.16M
$2.0M
1.60%
-870.2K
2026-03-31
Ikarian Capital, LLC
1.05M
$2.0M
1.46%
+799.5K
2026-03-31
Hudson Bay Capital Management LP
968.9K
$2.0M
1.34%
+243.9K
2026-03-31
Pathstone Holdings, LLC
859.1K
$2.0M
1.19%
--
2026-03-31
SG Americas Securities, LLC
719.3K
$1.0M
1.00%
+318.2K
2026-03-31
MILLENNIUM MANAGEMENT LLC
659.7K
$1.0M
0.91%
+75.5K
2026-03-31
Laurion Capital Management LP
525.4K
$1.0M
0.73%
-341.6K
2026-03-31
RENAISSANCE TECHNOLOGIES LLC
473.9K
$1.0M
0.66%
+50.8K
2026-03-31
GEODE CAPITAL MANAGEMENT, LLC
416.2K
--
0.58%
+6.0K
2026-03-31
BANK OF AMERICA CORP /DE/
320.2K
--
0.44%
+80.1K
2026-03-31
BOOTHBAY FUND MANAGEMENT, LLC
273.0K
--
0.38%
+233.4K
2026-03-31
GOLDMAN SACHS GROUP INC
206.7K
--
0.29%
+88.8K
2026-03-31
VANGUARD FIDUCIARY TRUST CO
199.2K
--
0.28%
--
2026-03-31
MARSHALL WACE, LLP
192.9K
--
0.27%
+172.0K
2026-03-31
BlackRock, Inc.
178.3K
--
0.25%
+8.8K
2026-03-31
BRIDGEWAY CAPITAL MANAGEMENT, LLC
176.2K
--
0.24%
+6.0K
2026-03-31
STATE STREET CORP
151.7K
--
0.21%
+51.5K
2026-03-31
MORGAN STANLEY
144.6K
--
0.20%
-22.3K
2026-03-31
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