ASPN Aspen Aerogels, Inc.

NYSE
$5.19

Aspen Aerogels, Inc. (ASPN) Institutional Ownership

What the institutions did with ASPN last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers reporting
201
filed a 13F this quarter
Managers holding
180
+17 on the quarter
Buyers
99
38 opened new
Sellers
67
21 sold out entirely
Buyer share
59.6%
of managers who traded it
Breadth
+19.3
net buyers, as a share of those trading

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Largest holders

Manager Shares % of reported
KIM, LLC 12.3M 16.7%
BlackRock, Inc. 5.3M 7.2%
OAKTOP CAPITAL MANAGEMENT II, L.P. 5.2M 7.0%
VANGUARD CAPITAL MANAGEMENT LLC 3.5M 4.8%
NEEDHAM INVESTMENT MANAGEMENT LLC 3.3M 4.4%
George Kaiser Family Foundation 3.2M 4.3%
STATE STREET CORP 2.6M 3.5%
AMERICAN CENTURY COMPANIES INC 2.5M 3.4%
JACOBS LEVY EQUITY MANAGEMENT, INC 2.1M 2.8%
AMERIPRISE FINANCIAL INC 1.8M 2.5%
GEODE CAPITAL MANAGEMENT, LLC 1.8M 2.4%
RICE HALL JAMES & ASSOCIATES, LLC 1.6M 2.2%
Invesco Ltd. 1.6M 2.2%
GAGNON SECURITIES LLC 1.5M 2.1%
DIMENSIONAL FUND ADVISORS LP 1.4M 2.0%
GOLDMAN SACHS GROUP INC 1.4M 1.9%
ROYCE & ASSOCIATES LP 1.3M 1.8%
AQR CAPITAL MANAGEMENT LLC 1.3M 1.7%
MILLENNIUM MANAGEMENT LLC 1.2M 1.6%
MARSHALL WACE, LLP 1.1M 1.6%
D. E. Shaw & Co., Inc. 1.1M 1.5%
JPMORGAN CHASE & CO 1.0M 1.4%
Telemark Asset Management, LLC 1.0M 1.4%
BNP PARIBAS FINANCIAL MARKETS 867.2K 1.2%
TWO SIGMA INVESTMENTS, LP 779.5K 1.1%

Largest changes

Manager Action Previous Current Change
AMERICAN CENTURY COMPANIES INC Increased 1.2M 2.5M +1.3M
NEEDHAM INVESTMENT MANAGEMENT LLC Reduced 4.5M 3.3M -1.3M
HRT FINANCIAL LP Sold Out 870.4K 0 -870.4K
JACOBS LEVY EQUITY MANAGEMENT, INC Increased 1.2M 2.1M +839.3K
AQR CAPITAL MANAGEMENT LLC Increased 526.1K 1.3M +750.2K
ACADIAN ASSET MANAGEMENT LLC New 0 684.9K +684.9K
Invesco Ltd. Reduced 2.3M 1.6M -678.2K
Samjo Management, LLC Sold Out 645.6K 0 -645.6K
BlackRock, Inc. Increased 4.7M 5.3M +534.1K
GOLDMAN SACHS GROUP INC Increased 899.5K 1.4M +472.8K
TUDOR INVESTMENT CORP ET AL Increased 151.1K 567.4K +416.3K
PANAGORA ASSET MANAGEMENT INC Increased 27.9K 442.4K +414.5K
Baird Financial Group, Inc. New 0 345.2K +345.2K
CITADEL ADVISORS LLC Reduced 581.2K 238.7K -342.5K
TWO SIGMA INVESTMENTS, LP Increased 441.4K 779.5K +338.0K
ROYCE & ASSOCIATES LP Increased 986.5K 1.3M +336.7K
GAGNON SECURITIES LLC Reduced 1.9M 1.5M -326.0K
AMERIPRISE FINANCIAL INC Increased 1.5M 1.8M +314.9K
Trexquant Investment LP New 0 302.4K +302.4K
RENAISSANCE TECHNOLOGIES LLC New 0 274.4K +274.4K
Palogic Value Management, L.P. Reduced 450.0K 185.6K -264.4K
Point72 Asset Management, L.P. Reduced 256.6K 9.0K -247.6K
STATE STREET CORP Increased 2.3M 2.6M +238.8K
D. E. Shaw & Co., Inc. Increased 833.6K 1.1M +232.9K
GEODE CAPITAL MANAGEMENT, LLC Increased 1.5M 1.8M +229.7K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.