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Overview
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Business Summary
Filings
Ownership
Valuation
Ownership — OSUR
Institutional Holdings
Insider Transactions
US Institutional Ownership
71.9%
Institution
Shares
Value
Ownership %
Change
Filing Date
BlackRock, Inc.
6.26M
$27.0M
9.07%
-259.5K
2026-06-30
NEUBERGER BERMAN GROUP LLC
4.69M
$20.0M
6.79%
+323.5K
2026-06-30
Altai Capital Management, L.P.
3.61M
$16.0M
5.24%
--
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
3.02M
$13.0M
4.38%
-12.0K
2026-06-30
SYSTEMATIC FINANCIAL MANAGEMENT LP
2.86M
$12.0M
4.14%
+377.5K
2026-06-30
DIMENSIONAL FUND ADVISORS LP
2.34M
$10.0M
3.39%
-479.9K
2026-06-30
RENAISSANCE TECHNOLOGIES LLC
2.01M
$8.0M
2.92%
-68.4K
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
1.81M
$8.0M
2.62%
-12.1K
2026-06-30
STATE STREET CORP
1.69M
$7.0M
2.45%
-18.2K
2026-06-30
GAGNON SECURITIES LLC
1.59M
$7.0M
2.31%
-122.2K
2026-06-30
CANNELL CAPITAL LLC
1.43M
$6.0M
2.07%
-575.9K
2026-06-30
Gagnon Advisors, LLC
1.21M
$5.0M
1.75%
--
2026-06-30
First Eagle Investment Management, LLC
1.06M
$4.0M
1.54%
--
2026-06-30
Peapod Lane Capital LLC
993.9K
$4.0M
1.44%
-24.6K
2026-06-30
WELLS FARGO & COMPANY/MN
924.0K
$4.0M
1.34%
+24.2K
2026-06-30
JACOBS LEVY EQUITY MANAGEMENT, INC
844.9K
$3.0M
1.23%
-154.7K
2026-06-30
D. E. Shaw & Co., Inc.
827.2K
$3.0M
1.20%
-555.2K
2026-06-30
Archon Capital Management LLC
747.9K
$3.0M
1.08%
--
2026-06-30
VANGUARD PORTFOLIO MANAGEMENT LLC
623.7K
$2.0M
0.90%
+33.5K
2026-06-30
JPMORGAN CHASE & CO
589.2K
$2.0M
0.85%
+192.1K
2026-06-30
NORTHERN TRUST CORP
587.4K
$2.0M
0.85%
-7.8K
2026-06-30
Sixth Street Partners Management Company, L.P.
579.6K
$2.0M
0.84%
--
2026-06-30
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
579.6K
$2.0M
0.84%
-6.3K
2026-06-30
GOLDMAN SACHS GROUP INC
561.6K
$2.0M
0.81%
+150.1K
2026-06-30
VANGUARD FIDUCIARY TRUST CO
458.1K
$2.0M
0.66%
+3.3K
2026-06-30
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