ASPN Institutional Ownership
Who owns Aspen Aerogels Inc and what the big funds did with it last quarter, from every SEC 13F filing. 180 funds reported holding ASPN at Jun 30, 2026, together owning 88.5% of the company.
- ▲99 buying vs 67 selling
- ▲Held by funds +5.0 pts
- ▲Funds holding +14
- ▼Superinvestors: 1 added, 3 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 180 | 166 | +8.4% |
| In funds' top 10 | 3 | 3 | 0.0% |
| 13F shares | 73.4M | 69.3M | +5.9% |
| Held by funds | 88.5% | 83.5% | +5.0 pts |
| New positions | 38 | 29 | +31.0% |
| Increased | 61 | 44 | +38.6% |
| Reduced | 46 | 58 | −20.7% |
| Sold out | 21 | 49 | −57.1% |
| Calls (shares) | 20K | 142K | −85.7% |
| Puts (shares) | 0 | 800 | −100.0% |
| Put/call ratio | 0.00 | 0.01 | −100.0% |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in ASPN
All superinvestors →
Who owns ASPN
share of fund held shares- Index and passive funds25.6%
- Active managers and hedge funds59.8%
- Banks and brokers9.7%
- Pensions, insurers and other4.9%
The top 10 holders own 56.7% of all ASPN shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
29 funds changed their position- AIGH Capital Management LLCNew+7.2M sh
- Y-Intercept (Hong Kong) LtdAdded+239K sh
- Inspire Investing, LLCSold out−106K sh
- Bailard, Inc.Sold out−30K sh
- Creative PlanningAdded+33K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | Kim, LLC | 14.80% | 12.3M | $77.9M | 0 |
| 2 | BlackRock, Inc. | 6.36% | 5.3M | $33.5M | +534K |
| 3 | Oaktop Capital Management II, L.P. | 6.23% | 5.2M | $32.8M | 0 |
| 4 | Vanguard Capital Management LLC | 4.26% | 3.5M | $22.4M | +103K |
| 5 | Needham Investment Management LLC | 3.93% | 3.3M | $20.7M | −1.3M |
| 6 | George Kaiser Family Foundation | 3.82% | 3.2M | $20.1M | 0 |
| 7 | State Street Corp | 3.08% | 2.6M | $16.2M | +239K |
| 8 | American Century Companies Inc | 3.02% | 2.5M | $15.9M | +1.3M |
| 9 | Jacobs Levy Equity Management, Inc | 2.48% | 2.1M | $13M | +839K |
| 10 | Ameriprise Financial Inc | 2.19% | 1.8M | $11.5M | +315K |
- American Century Companies Inc+1.3M sh+$8M
- Jacobs Levy Equity Management, Inc+839K sh+$5.3M
- AQR Capital Management LLC+750K sh+$4.8M
- Acadian Asset Management LLC+685K sh+$4.3M
- BlackRock, Inc.+534K sh+$3.4M
- Goldman Sachs Group Inc+473K sh+$3M
- Tudor Investment Corp ET AL+416K sh+$2.6M
- Panagora Asset Management Inc+415K sh+$2.6M
- Needham Investment Management LLC−1.3M sh−$8M
- Invesco Ltd.−678K sh−$4.3M
- Hrt Financial LP−870K sh−$3M
- Samjo Management, LLC−646K sh−$2.2M
- Citadel Advisors LLC−342K sh−$2.2M
- Gagnon Securities LLC−326K sh−$2.1M
- Palogic Value Management, L.P.−264K sh−$1.7M
- Point72 Asset Management, L.P.−248K sh−$1.6M
ASPN institutional ownership FAQ
Who owns the most ASPN stock?
In Q2 2026 13F filings the largest holder of ASPN was Kim, LLC, followed by BlackRock, Inc. and Oaktop Capital Management II, L.P.. Index fund managers are usually the biggest holders of large companies.
What percentage of ASPN is owned by institutions?
Funds that file 13F reports held 88.5% of ASPN's shares at Jun 30, 2026, compared with 83.5% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying ASPN?
In Q2 2026, 99 funds bought ASPN (38 of them new positions) and 67 sold (21 sold out completely). Among well known investors, 1 added and 3 cut. Our fund sentiment for ASPN is bullish.
What is ASPN's institutional put/call ratio?
Funds reported $0 of ASPN puts against $129K of calls, a put/call ratio of 0.00 (0.01 the quarter before). Market makers and bank trading desks are left out, since their options are mostly hedges.
How current is this ASPN ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.