Aspen Aerogels ASPN Institutional Ownership

NYSE ASPN

$5.41 -0.07 (-1.19%)

As of: Oct 1, 2026 · 11:31 AM EDT

Institutions by Trading Activity

177 Institutions

Increased 98 55.4%

Unchanged 33 18.6%

Reduced 46 26.0%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

89.12%

▲+5.37 pp QoQ

Shares Held by Institutions

73.87Mn

of 82.89Mn outstanding

▲+10.56% QoQ

Shares Outstanding

82.89Mn

9.02Mn held outside 13F filers

Institutional Investors

177

filed 13F for Jun 2026

▲+12 vs prior quarter

Net Shares Added (QoQ)

+7.06Mn

accumulated since last quarter

Value of Holdings

$404.07Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Aspen Aerogels Inc (NYSE:ASPN) has 177 institutional investors with active 13F positions as of June 2026.

Their combined ownership stood at 89.1% of outstanding shares in June 2026, up from 83.7% in March 2026.
They increased total shares held in Aspen Aerogels by 10.56% from last quarter, and the number of investors in ASPN decreased 1.12% annually.
Activity in ASPN broke down as 98 buyers, 46 sellers, and 33 unchanged among 177 total holders.
The aggregate institutional position in Aspen Aerogels amounted to 73.87Mn shares as of June 2026, up by 7.06Mn shares quarter on quarter, and up 3.4Mn shares year over year.
KIM, LLC is the top holder of Aspen Aerogels as of June 30, 2026, with 12.28Mn shares representing 14.81% of outstanding stock.
Top purchasers of ASPN stock for the quarter ending June 2026 included AMERICAN CENTURY COMPANIES INC (1.26Mn), JACOBS LEVY EQUITY MANAGEMENT, INC (839.3K), AQR CAPITAL MANAGEMENT LLC (750.23K), ACADIAN ASSET MANAGEMENT LLC (684.92K), Sixth Street Partners Management Company, L.P. (570.71K).
The largest sales of ASPN for the quarter ending June 2026 came from NEEDHAM INVESTMENT MANAGEMENT LLC (1.26Mn), Invesco Ltd. (678.21K), CITADEL ADVISORS LLC (342.46K), GAGNON SECURITIES LLC (326.04K), Palogic Value Management, L.P. (264.41K).
According to Business Quant data, leading holders of ASPN for June 2026 are KIM, LLC (12.28Mn), BlackRock, Inc. (5.28Mn), OAKTOP CAPITAL MANAGEMENT II, L.P. (5.17Mn), VANGUARD CAPITAL MANAGEMENT LLC (3.54Mn), NEEDHAM INVESTMENT MANAGEMENT LLC (3.26Mn), GEORGE KAISER FAMILY FOUNDATION (3.17Mn), State Street Corp (2.56Mn), AMERICAN CENTURY COMPANIES INC (2.51Mn), JACOBS LEVY EQUITY MANAGEMENT, INC (2.06Mn), Ameriprise Financial Inc (1.82Mn).

Form 13F Holdings

177 Institutional Holders

Report period 30 Jun, 2026

Total shares held 73.87Mn

Of outstanding 89.12%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	KIM, LLC	0001888968	12,280,426	14.81%	0	0.00%	$77.86Mn
2	BlackRock, Inc.	0002012383	5,277,148	6.37%	▲534,072	+11.26%	$33.46Mn
3	OAKTOP CAPITAL MANAGEMENT II, L.P.	0001550660	5,168,674	6.24%	0	0.00%	$32.77Mn
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	3,539,271	4.27%	▲103,115	+3.00%	$22.44Mn
5	NEEDHAM INVESTMENT MANAGEMENT LLC	0001167212	3,260,800	3.93%	▼1,257,975	-27.84%	$20.67Mn
6	GEORGE KAISER FAMILY FOUNDATION	0001265376	3,167,322	3.82%	0	0.00%	$20.08Mn
7	State Street Corp	0000093751	2,559,495	3.09%	▲238,768	+10.29%	$16.23Mn
8	AMERICAN CENTURY COMPANIES INC	0000748054	2,510,042	3.03%	▲1,262,259	+101.16%	$15.91Mn
9	JACOBS LEVY EQUITY MANAGEMENT, INC	0000884414	2,058,083	2.48%	▲839,304	+68.86%	$13.05Mn
10	Ameriprise Financial Inc	0000820027	1,821,295	2.20%	▲314,916	+20.91%	$11.55Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	1,770,425	2.14%	▲229,654	+14.91%	$11.23Mn
12	RICE HALL JAMES & ASSOCIATES, LLC	0001230765	1,635,259	1.97%	▲82,631	+5.32%	$10.37Mn
13	Invesco Ltd.	0000914208	1,619,972	1.95%	▼678,211	-29.51%	$10.27Mn
14	GAGNON SECURITIES LLC	0001125725	1,535,812	1.85%	▼326,039	-17.51%	$9.74Mn
15	DIMENSIONAL FUND ADVISORS LP	0000354204	1,447,333	1.75%	▲190,853	+15.19%	$9.17Mn
16	Goldman Sachs Group Inc	0000886982	1,372,300	1.66%	▲472,787	+52.56%	$8.70Mn
17	ROYCE & ASSOCIATES LP	0000906304	1,323,218	1.60%	▲336,705	+34.13%	$8.39Mn
18	AQR CAPITAL MANAGEMENT LLC	0001167557	1,276,346	1.54%	▲750,227	+142.60%	$8.09Mn
19	MILLENNIUM MANAGEMENT LLC	0001273087	1,190,616	1.44%	▼214,059	-15.24%	$7.55Mn
20	MARSHALL WACE, LLP	0001318757	1,146,707	1.38%	▼116,395	-9.22%	$7.27Mn

Showing 1 to 20 of 177 holders