Aspen Aerogels
ASPN
204 hedge funds and large institutions have $497M invested in Aspen Aerogels in 2025 Q3 according to their latest regulatory filings, with 51 funds opening new positions, 63 increasing their positions, 56 reducing their positions, and 28 closing their positions.
253% more call options, than puts
Call options by funds: $11.6M | Put options by funds: $3.28M
82% more first-time investments, than exits
New positions opened: 51 | Existing positions closed: 28
17% more capital invested
Capital invested by funds: $424M → $497M (+$73.2M)
13% more repeat investments, than reductions
Existing positions increased: 63 | Existing positions reduced: 56
12% more funds holding
Funds holding: 182 → 204 (+22)
0% more funds holding in top 10
Funds holding in top 10: 3 → 3 (0)
0.39% less ownership
Funds ownership: 87.04% → 86.65% (-0.39%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
+$6.71M |
| 2 |
PIM
Peregrine Investment Management
Toronto,
Ontario, Canada
|
+$4.23M |
| 3 |
Millennium Management
New York
|
+$3.81M |
| 4 |
First Eagle Investment Management
New York
|
+$3.65M |
| 5 |
Tudor Investment Corp
Stamford,
Connecticut
|
+$3.43M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Federated Hermes
Pittsburgh,
Pennsylvania
|
-$10.4M |
| 2 |
Goldman Sachs
New York
|
-$5.51M |
| 3 |
RA
Royce & Associates
New York
|
-$3.14M |
| 4 |
Renaissance Technologies
New York
|
-$3.05M |
| 5 |
HF
HRT Financial
New York
|
-$3.02M |
ASPN Hedge Fund Activity: Q3 2025 in Review
204 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Aspen Aerogels (ASPN) for Q3 2025, worth a combined $497M — up 17% from $424M a quarter earlier.
Buyers outnumbered sellers: 51 funds opened new ASPN positions and 28 closed out — a net gain of 23 holders — while 63 added to existing stakes and 56 trimmed.
The largest buyer was Citadel Advisors, adding an estimated $6.71M. The largest seller was Federated Hermes, cutting an estimated $10.4M.
- 204 institutional investors held Aspen Aerogels (ASPN) as of Q3 2025, up from 182 in Q2 2025.
- Funds reported $497M of Aspen Aerogels stock for Q3 2025, up 17% quarter-over-quarter.
- 51 funds opened new Aspen Aerogels positions in Q3 2025 and 28 closed out, a net change of +23 holders.
- The largest Aspen Aerogels buyer in Q3 2025 was Citadel Advisors, an estimated $6.71M added.
- The largest Aspen Aerogels seller in Q3 2025 was Federated Hermes, an estimated $10.4M sold.
Based on aggregated 13F filings for Q3 2025.