Aspen Aerogels Inc (ASPN)
Industrials
Building Products & Equipment
4.60 $
+2.7%
vs. previous close
Closing price · As of: 31. Jul 2026
Who owns Aspen Aerogels Inc (ASPN)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 92.6% of the shares are freely tradable; institutional investors hold 70.4%.
Ownership Structure
Institutional ownership
Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
70.4%
Insiders
Share of the stock held by the executives, founders and major shareholders of the company itself.
16.2%
Float
Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
92.6%
Short % of float
Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
10.2%
Shares Outstanding
Total number of shares issued. Price times share count gives market cap.
83Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| KIM, LLC | 14.83 | 12,280,426 | +0.0 | 03/31/2026 |
| OAKTOP CAPITAL MANAGEMENT II LP | 6.24 | 5,168,674 | +17.6 | 03/31/2026 |
| BlackRock Inc | 5.73 | 4,743,076 | -3.8 | 03/31/2026 |
| Vanguard Group Inc | 5.66 | 4,685,950 | +3.9 | 12/31/2025 |
| Needham Investment Management, LLC | 5.46 | 4,518,775 | +3.8 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.15 | 3,436,156 | +0.0 | 03/31/2026 |
| George Kaiser Family Foundation | 3.82 | 3,167,322 | +0.0 | 03/31/2026 |
| State Street Corp | 2.80 | 2,320,727 | -7.2 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Needham Aggressive Growth Retail | 3.43 | 2,840,000 | +5.2 | 03/31/2026 |
| Vanguard Total Stock Mkt Idx Inv | 3.10 | 2,565,612 | +0.0 | 04/30/2026 |
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: July 31, 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.