13F Insight
DOSSIER · 13F Holders · Q1 2026Mega-capCrowded
ASPN

ASPEN AEROGELS INC

177 institutions still hold ASPEN AEROGELS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 04523Y105·177 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 0.3%
vs prior quarter
13F value held
$182M
54.0% inst. owned
of float
Holders
177
-8 QoQ
filers reporting
Activity
+44 / −116
+959 added · −932 reduced
this quarter
Concentration
23.02%
KIM, LLC #1
top holder share
AI Holders Summary · Q1 2026

177 institutions reported ASPN in Q1 2026. KIM, LLC leads at 23.0% of the visible book. -8 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
KIM, LLC
CIK 0001888968
$42M12.3M4.30%Q1 202602
OAKTOP CAPITAL MANAGEMENT II, L.P.
CIK 0001550660
$18M5.2M1.32%Q1 202603
BlackRock, Inc.
CIK 0002012383
$16M4.7M0.00%Q1 202604
NEEDHAM INVESTMENT MANAGEMENT LLC
CIK 0001167212
$12M4.4M0.78%Q4 202505
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$12M3.4M0.00%Q1 202606
GEORGE KAISER FAMILY FOUNDATION
CIK 0001265376
$11M3.2M1.23%Q1 202607
STATE STREET CORP
CIK 0000093751
$8M2.3M0.00%Q1 202608
Invesco Ltd.
CIK 0000914208
$8M2.3M0.00%Q1 202609
GAGNON SECURITIES LLC
CIK 0001125725
$6M1.9M1.47%Q1 202610
Mesirow Institutional Investment Management, Inc.
CIK 0001947591
$6M489K0.45%Q4 202411
RICE HALL JAMES & ASSOCIATES, LLC
CIK 0001230765
$5M1.6M0.30%Q1 202612
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$5M1.5M0.00%Q1 202613
AMERIPRISE FINANCIAL INC
CIK 0000820027
$5M1.5M0.00%Q1 202614
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$5M1.4M0.00%Q1 202615
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$4M1.3M0.00%Q1 202616
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$4M1.2M0.00%Q1 202617
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 0000884414
$4M1.2M0.02%Q1 202618
CITADEL ADVISORS LLC
CIK 0001423053
$4M1.3M0.00%Q4 202519
Telemark Asset Management, LLC
CIK 0001420816
$3M1.0M0.32%Q1 202620
ROYCE & ASSOCIATES LP
CIK 0000906304
$3M987K0.03%Q1 2026
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