Aspen Aerogels, Inc. (ASPN) ownership: Top institutional holder: KIM, LLC ($42.00M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| KIM, LLC | 12280426.00 | $42.00M | 2026-03-31 |
| OAKTOP CAPITAL MANAGEMENT II, L.P. | 5168674.00 | $17.68M | 2026-03-31 |
| BlackRock, Inc. | 4743076.00 | $16.22M | 2026-03-31 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | 4518775.00 | $15.45M | 2026-03-31 |
| VANGUARD GROUP INC | 4685950.00 | $13.26M | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3436156.00 | $11.75M | 2026-03-31 |
| George Kaiser Family Foundation | 3167322.00 | $10.83M | 2026-03-31 |
| STATE STREET CORP | 2320727.00 | $7.94M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.