Aspen Aerogels
ASPN · NYSE
$5.33+$0.01 (+0.19%)TodayMarket closed ·
Prev close $5.32
Who owns ASPN
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 49.6% of ASPN’s shares.
- Koch Industries LLC14.8%
- Twin Oaks Partners6.2%
- BlackRock Institutional Trust Company, N.A.5.7%
- Vanguard Capital Management, LLC4.3%
- Next 6 largest institutions18.6%
- All other shareholders50.4%
| Holder | Shares | % of shares |
|---|---|---|
| Koch Industries LLC | 12.28M | 14.82% |
| Twin Oaks Partners | 5.17M | 6.24% |
| BlackRock Institutional Trust Company, N.A. | 4.75M | 5.73% |
| Vanguard Capital Management, LLC | 3.54M | 4.27% |
| Needham Investment Management L.L.C. | 3.26M | 3.93% |
| George Kaiser Family Foundation | 3.17M | 3.82% |
| State Street Investment Management (US) | 2.56M | 3.09% |
| American Century Investment Management, Inc. | 2.51M | 3.03% |
| Jacobs Levy Equity Management, Inc. | 2.06M | 2.48% |
| Columbia Threadneedle Investments (US) | 1.82M | 2.20% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 2.64M | 3.19% |
| Avantis US Small Cap Value ETF | 2.55M | 3.08% |
| Needham Aggressive Growth Fund | 2.08M | 2.50% |
| iShares Russell 2000 ETF | 1.76M | 2.12% |
| Invesco WilderHill Clean Energy ETF | 1.11M | 1.34% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $58.09M (1 trade) of ASPN on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| DEEGAN GLENN E. | Tax withholding | 1.14K | $6.26K |
| Wood River Capital, LLC | Sale | 12.28M | $58.09M |
| NOGLOWS WILLIAM P | Option exercise | 14.80K | — |
| NOGLOWS WILLIAM P | Option exercise | 14.80K | $70.30K |
| Mitchell Steven R | Award | 8.71K | — |
| Mitchell Steven R | Award | 10.37K | — |
| SWEETNAM JAMES E | Award | 8.71K | — |
| SWEETNAM JAMES E | Award | 10.37K | — |
| NOGLOWS WILLIAM P | Award | 8.71K | — |
| NOGLOWS WILLIAM P | Award | 10.37K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 6.10M
- Days to cover
- 5.24
- % of shares outstanding
- 7.36%
- Average daily volume
- 1.16M
- Change since last report
- −32.7%
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