Aspen Aerogels Inc (ASPN) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

79,175,000Shares Outstanding

20,620,022Shares held by institutions

$73,407,278Value of institutional holdings

83.68%Institutional ownership %

1.95%Shares Changed QoQ

173No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Aspen Aerogels Inc (NYSE:ASPN) currently has 173 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

Aspen Aerogels saw its institutional ownership percentage fell to 83.7% in December 2025 from 90.1% in September 2025.
In percentage terms, this reflects as a holdings change of 1.95% quarter on quarter, and a decrease of 24.45% year over year.
A review of institutional activity for Aspen Aerogels shows 82 of 173 filers increasing their positions, while 60 reduced their stake, and 31 remained unchanged.
This class of investors increased its holdings in Aspen Aerogels to 66.26Mn shares for the 13F-cycle ending December 2025, up by 1.27Mn shares quarter on quarter, and down 9.07Mn shares year over year.
KIM, LLC continues to be the largest institutional holder of Aspen Aerogels as of December 31, 2025, with a position of 12.28Mn shares, representing 15.51% of the company's outstanding stock.
Among the most significant buyers of Aspen Aerogels during December 2025 were AMERIPRISE FINANCIAL INC (1.38Mn), NEEDHAM INVESTMENT MANAGEMENT LLC (912.00K), AMERICAN CENTURY COMPANIES INC (686.67K), STATE STREET CORP (556.83K), Samjo Management, LLC (457.70K).
Leading sellers of Aspen Aerogels stock in December 2025 included AWM Investment Company, Inc. (1.51Mn), Telemark Asset Management, LLC (792.42K), NEW YORK STATE COMMON RETIREMENT FUND (703.79K), GAGNON SECURITIES LLC (621.59K), MILLENNIUM MANAGEMENT LLC (576.57K).
The top 10 institutional holders of Aspen Aerogels for the quarter ending December 2025 included KIM, LLC (12.28Mn), BlackRock, Inc. (4.93Mn), VANGUARD GROUP INC (4.69Mn), OAKTOP CAPITAL MANAGEMENT II, L.P. (4.39Mn), NEEDHAM INVESTMENT MANAGEMENT LLC (4.35Mn), GEORGE KAISER FAMILY FOUNDATION (3.17Mn), STATE STREET CORP (2.50Mn), DIMENSIONAL FUND ADVISORS LP (2.00Mn), GEODE CAPITAL MANAGEMENT, LLC (1.60Mn), JPMORGAN CHASE & CO (1.48Mn).

173 Institutional Holders

20,620,022 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
KIM, LLC	31 Dec, 2025	12,280,426	0	0.00%	$34,753,606.00
BlackRock, Inc.	31 Dec, 2025	4,929,239	-48,319	-0.97%	$13,949,748.00
VANGUARD GROUP INC	31 Dec, 2025	4,685,950	175,580	3.89%	$13,261,239.00
OAKTOP CAPITAL MANAGEMENT II, L.P.	31 Dec, 2025	4,394,525	0	0.00%	$12,436,506.00
NEEDHAM INVESTMENT MANAGEMENT LLC	31 Dec, 2025	4,351,700	912,000	26.51%	$12,315,311.00
GEORGE KAISER FAMILY FOUNDATION	31 Dec, 2025	3,167,322	0	0.00%	$8,963,521.00
STATE STREET CORP	31 Dec, 2025	2,501,469	556,833	28.63%	$7,079,157.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	2,003,963	-248,050	-11.01%	$5,671,810.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	1,602,049	17,178	1.08%	$4,534,863.00
JPMORGAN CHASE & CO	31 Dec, 2025	1,483,745	133,996	9.93%	$4,198,998.00
RICE HALL JAMES & ASSOCIATES, LLC	31 Dec, 2025	1,421,605	13,879	0.99%	$4,023,142.00
AMERIPRISE FINANCIAL INC	31 Dec, 2025	1,378,284	1,378,284	0.00%	$3,900,544.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	1,294,928	-124,876	-8.80%	$3,664,647.00
AMERICAN CENTURY COMPANIES INC	31 Dec, 2025	1,157,978	686,666	145.69%	$3,277,078.00
GAGNON SECURITIES LLC	31 Dec, 2025	1,133,248	-621,585	-35.42%	$3,207,092.00
Telemark Asset Management, LLC	31 Dec, 2025	1,000,000	-792,424	-44.21%	$2,830,000.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	870,951	-576,566	-39.83%	$2,464,791.00
CITADEL ADVISORS LLC	31 Dec, 2025	866,218	-248,372	-22.28%	$2,451,397.00
Samjo Management, LLC	31 Dec, 2025	798,525	457,700	134.29%	$2,259,826.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	757,419	-54,109	-6.67%	$2,143,496.00

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