Aspen Aerogels
ASPN
182 hedge funds and large institutions have $424M invested in Aspen Aerogels in 2025 Q2 according to their latest regulatory filings, with 26 funds opening new positions, 76 increasing their positions, 53 reducing their positions, and 65 closing their positions.
96% more call options, than puts
Call options by funds: $4.93M | Put options by funds: $2.51M
43% more repeat investments, than reductions
Existing positions increased: 76 | Existing positions reduced: 53
0.18% more ownership
Funds ownership: 86.86% → 87.04% (+0.18%)
0% more funds holding in top 10
Funds holding in top 10: 3 → 3 (0)
7% less capital invested
Capital invested by funds: $458M → $424M (-$34.3M)
18% less funds holding
Funds holding: 221 → 182 (-39)
60% less first-time investments, than exits
New positions opened: 26 | Existing positions closed: 65
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
GS
Gagnon Securities
New York
|
+$10.9M |
| 2 |
Federated Hermes
Pittsburgh,
Pennsylvania
|
+$10.2M |
| 3 |
Goldman Sachs
New York
|
+$5.34M |
| 4 |
Invesco
Atlanta,
Georgia
|
+$4.37M |
| 5 |
RHJA
Rice Hall James & Associates
San Diego,
California
|
+$4.12M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
-$6.03M |
| 2 |
AIC
AWM Investment Company
New York
|
-$5.83M |
| 3 |
MIM
MetLife Investment Management
Whippany,
New Jersey
|
-$4.14M |
| 4 |
DC
Dendur Capital
New York
|
-$4.12M |
| 5 |
Millennium Management
New York
|
-$3.98M |
ASPN Hedge Fund Activity: Q2 2025 in Review
182 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Aspen Aerogels (ASPN) for Q2 2025, worth a combined $424M — down 7.5% from $458M a quarter earlier.
Sellers outnumbered buyers: 65 funds closed out of ASPN and 26 opened new positions — a net loss of 39 holders — while 53 trimmed existing stakes and 76 added.
The largest buyer was Gagnon Securities, opening a new position worth an estimated $10.9M. The largest seller was Fidelity Investments, cutting an estimated $6.03M.
- 182 institutional investors held Aspen Aerogels (ASPN) as of Q2 2025, down from 221 in Q1 2025.
- Funds reported $424M of Aspen Aerogels stock for Q2 2025, down 7.5% quarter-over-quarter.
- 26 funds opened new Aspen Aerogels positions in Q2 2025 and 65 closed out, a net change of -39 holders.
- The largest Aspen Aerogels buyer in Q2 2025 was Gagnon Securities, an estimated $10.9M added.
- The largest Aspen Aerogels seller in Q2 2025 was Fidelity Investments, an estimated $6.03M sold.
Based on aggregated 13F filings for Q2 2025.