Aspen Aerogels ASPN Institutional Ownership

Updated Oct 11, 2026

Aspen Aerogels Inc (NYSE:ASPN) was held by 176 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

• Together they owned 88.32% of the outstanding stock in Q2 2026, up from 83.66% a quarter earlier.
• Total shares held in Aspen Aerogels rose 5.78% from Q1 2026, while the number of holders fell 1.12% from Q2 2025.
• Of the 176 holders of ASPN in Q2 2026, 97 added to their positions, 46 reduced their stakes and 33 left their positions unchanged.
• Altogether, institutional holders owned 73.3Mn ASPN shares at the end of Q2 2026, up 4.01Mn from the prior quarter and up 2.83Mn from a year earlier.
• Kim, LLC held the largest position in ASPN at 12.28Mn shares as of June 30, 2026, or 14.80% of shares outstanding.
• Among existing holders, the largest additions to Aspen Aerogels in Q2 2026 came from American Century Companies Inc (+1.26Mn shares), Jacobs Levy Equity Management, Inc (+839.3K shares), AQR Capital Management LLC (+750.23K shares), BlackRock, Inc. (+534.07K shares) and Goldman Sachs Group Inc (+472.79K shares).
• The largest position reductions in ASPN for Q2 2026 were by Needham Investment Management LLC (-1.26Mn shares), Invesco Ltd. (-678.21K shares), Citadel Advisors LLC (-342.46K shares), Gagnon Securities LLC (-326.04K shares) and Palogic Value Management, L.P. (-264.41K shares).
• Per Business Quant data, the 10 largest holders of Aspen Aerogels at the end of Q2 2026 were Kim, LLC (12.28Mn shares), BlackRock, Inc. (5.28Mn shares), Oaktop Capital Management II, L.P. (5.17Mn shares), Vanguard Capital Management LLC (3.54Mn shares), Needham Investment Management LLC (3.26Mn shares), George Kaiser Family Foundation (3.17Mn shares), State Street Corp (2.56Mn shares), American Century Companies Inc (2.51Mn shares), Jacobs Levy Equity Management, Inc (2.06Mn shares) and Ameriprise Financial Inc (1.82Mn shares).