Aspen Aerogels Inc
Ownership
Ownership Structure
Who owns Aspen Aerogels Inc (ASPN)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 92.5% of the shares are freely tradable; institutional investors hold 70.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| KIM, LLC | 14.80 | 12,280,426 | +0.0 | 03/31/2026 |
| OAKTOP CAPITAL MANAGEMENT II LP | 6.23 | 5,168,674 | +0.0 | 06/30/2026 |
| BlackRock Inc | 5.72 | 4,743,076 | -3.8 | 03/31/2026 |
| Needham Investment Management, LLC | 5.45 | 4,518,775 | +3.8 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.14 | 3,436,156 | +0.0 | 03/31/2026 |
| George Kaiser Family Foundation | 3.82 | 3,167,322 | +0.0 | 06/30/2026 |
| American Century Companies Inc | 3.02 | 2,510,042 | +101.2 | 06/30/2026 |
| State Street Corp | 2.80 | 2,320,727 | -7.2 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.18 | 2,642,312 | +0.0 | 07/31/2026 |
| Avantis US Small Cap Value ETF | 3.08 | 2,554,816 | +0.0 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.