Aspen Aerogels Inc (ASPN) Institutional Ownership

Ownership Summary

Aspen Aerogels Inc (NYSE:ASPN) has 177 institutional investors with active 13F positions as of December 2025.

• These investors held 86.1% of outstanding shares in December 2025, down from 89.8% in September 2025.
• Their total shares held in ASPN increased 3.13% from the prior quarter, while the number of investors in Aspen Aerogels decreased 23.04% year over year.
• Among the 177 funds, 85 bought more Aspen Aerogels shares, 61 sold down, and 31 held their ground.
• The aggregate institutional position in Aspen Aerogels amounted to 70.96Mn shares as of December 2025, up by 2.15Mn shares quarter on quarter, and down 4.67Mn shares year over year.
• KIM, LLC holds the largest position in ASPN at 12.28Mn shares as of December 31, 2025, or 14.9% of shares outstanding.
• Leading buyers of Aspen Aerogels shares for the quarter ending December 2025 were Invesco Ltd. (2.91Mn), Ameriprise Financial Inc (1.38Mn), Samjo Management, LLC (1.26Mn), NEEDHAM INVESTMENT MANAGEMENT LLC (912.0K), AMERICAN CENTURY COMPANIES INC (686.67K).
• The biggest sellers of Aspen Aerogels for the quarter ending December 2025 included AWM Investment Company, Inc. (1.51Mn), Jpmorgan Chase & Co (1.22Mn), TUDOR INVESTMENT CORP ET AL (894.02K), Bank Of America Corp /De/ (877.27K), Telemark Asset Management, LLC (792.42K).
• Business Quant data shows the 10 biggest positions in Aspen Aerogels as of December 2025 are held by 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), Invesco Ltd. (4.13Mn), GEORGE KAISER FAMILY FOUNDATION (3.17Mn), State Street Corp (2.5Mn), DIMENSIONAL FUND ADVISORS LP (2.0Mn), GEODE CAPITAL MANAGEMENT, LLC (1.6Mn).