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Overview
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Business Summary
Filings
Ownership
Valuation
Ownership — ASPN
Institutional Holdings
Insider Transactions
US Institutional Ownership
84.8%
Institution
Shares
Value
Ownership %
Change
Filing Date
KIM, LLC
12.28M
$77.0M
14.80%
--
2026-06-30
BlackRock, Inc.
5.28M
$33.0M
6.36%
+534.1K
2026-06-30
OAKTOP CAPITAL MANAGEMENT II, L.P.
5.17M
$32.0M
6.23%
--
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
3.54M
$22.0M
4.26%
+103.1K
2026-06-30
NEEDHAM INVESTMENT MANAGEMENT LLC
3.26M
$20.0M
3.93%
-1.26M
2026-06-30
STATE STREET CORP
2.56M
$16.0M
3.08%
+238.8K
2026-06-30
AMERICAN CENTURY COMPANIES INC
2.51M
$15.0M
3.02%
+1.26M
2026-06-30
JACOBS LEVY EQUITY MANAGEMENT, INC
2.06M
$13.0M
2.48%
+839.3K
2026-06-30
AMERIPRISE FINANCIAL INC
1.82M
$11.0M
2.19%
+314.9K
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
1.77M
$11.0M
2.13%
+229.7K
2026-06-30
RICE HALL JAMES & ASSOCIATES, LLC
1.64M
$10.0M
1.97%
+82.6K
2026-06-30
Invesco Ltd.
1.62M
$10.0M
1.95%
-678.2K
2026-06-30
GAGNON SECURITIES LLC
1.54M
$9.0M
1.85%
-326.0K
2026-06-30
DIMENSIONAL FUND ADVISORS LP
1.45M
$9.0M
1.74%
+190.9K
2026-06-30
GOLDMAN SACHS GROUP INC
1.37M
$8.0M
1.65%
+472.8K
2026-06-30
ROYCE & ASSOCIATES LP
1.32M
$8.0M
1.59%
+336.7K
2026-06-30
AQR CAPITAL MANAGEMENT LLC
1.28M
$8.0M
1.54%
+750.2K
2026-06-30
MILLENNIUM MANAGEMENT LLC
1.19M
$7.0M
1.43%
-214.1K
2026-06-30
MARSHALL WACE, LLP
1.15M
$7.0M
1.38%
-116.4K
2026-06-30
D. E. Shaw & Co., Inc.
1.07M
$6.0M
1.29%
+232.9K
2026-06-30
JPMORGAN CHASE & CO
1.00M
$6.0M
1.21%
-479.4K
2026-06-30
Telemark Asset Management, LLC
1.00M
$6.0M
1.20%
--
2026-06-30
BNP PARIBAS FINANCIAL MARKETS
867.2K
$5.0M
1.04%
+169.3K
2026-06-30
TWO SIGMA INVESTMENTS, LP
779.5K
$4.0M
0.94%
--
2026-06-30
VANGUARD PORTFOLIO MANAGEMENT LLC
699.0K
$4.0M
0.84%
-17.7K
2026-06-30
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