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. 92.4% 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 | 06/30/2026 |
| BlackRock Inc | 6.36 | 5,277,148 | +11.3 | 06/30/2026 |
| OAKTOP CAPITAL MANAGEMENT II LP | 6.23 | 5,168,674 | +0.0 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.26 | 3,539,271 | +3.0 | 06/30/2026 |
| Needham Investment Management, LLC | 3.93 | 3,260,800 | -27.8 | 06/30/2026 |
| George Kaiser Family Foundation | 3.82 | 3,167,322 | +0.0 | 06/30/2026 |
| State Street Corp | 3.08 | 2,559,495 | +10.3 | 06/30/2026 |
| American Century Companies Inc | 3.02 | 2,510,042 | +101.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.18 | 2,642,312 | +0.0 | 09/30/2026 |
| Avantis US Small Cap Value ETF | 2.71 | 2,245,934 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Deegan Glenn E. | CAO, GC & Corp Secretary | 66,033 | 336,768 $ | Sep 30, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 30, 2026 | Deegan Glenn E. | CAO, GC & Corp Secretary | Other | 1,143 | 5.48 | 6,264 |
| Sep 23, 2026 | Wood River Capital, LLC | Former 10% Owner | Sell | 12,280,426 | 4.73 | 58,086,415 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 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.