Who owns ASPN?
Institutional ownership of Aspen Aerogels Inc. from Form 13F, Q2 2026
180 institutional managers reported holding Aspen Aerogels Inc. (ASPN) in Form 13F filings for Q2 2026, with 73,421,942 shares worth $465M. The largest reported holder was Kim, LLC. Managers that filed both quarters added a net 4,143,940 shares (+6.0%). 38 opened new positions and 21 sold out.
- Funds holding
- 180
- Value held
- $465M
- New / sold out
- 38 / 21
- Net shares, same filers
- +6.0%
Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
Largest holders of ASPN
| Fund | Value | Share of 13F holdings | Shares | Move |
|---|---|---|---|---|
| Kim, LLC | $77.9M | 16.7% | 12,280,426 | Unchanged |
| BlackRock, Inc. | $33.5M | 7.2% | 5,277,148 | Added |
| Oaktop Capital Management II, L.p. | $32.8M | 7.0% | 5,168,674 | Unchanged |
| Vanguard Capital Management LLC | $22.4M | 4.8% | 3,539,271 | Added |
| Needham Investment Management LLC | $20.7M | 4.4% | 3,260,800 | Trimmed |
| George Kaiser Family Foundation | $20.1M | 4.3% | 3,167,322 | Unchanged |
| State Street Corp | $16.2M | 3.5% | 2,559,495 | Added |
| American Century Companies Inc | $15.9M | 3.4% | 2,510,042 | Added |
| Jacobs Levy Equity Management, Inc | $13.0M | 2.8% | 2,058,083 | Added |
| Ameriprise Financial Inc | $11.5M | 2.5% | 1,821,295 | Added |
| Geode Capital Management, LLC | $11.2M | 2.4% | 1,770,425 | Added |
| Rice Hall James & Associates, LLC | $10.4M | 2.2% | 1,635,259 | Added |
| Invesco Ltd. | $10.3M | 2.2% | 1,619,972 | Trimmed |
| Gagnon Securities LLC | $9.7M | 2.1% | 1,535,812 | Trimmed |
| Dimensional Fund Advisors LP | $9.2M | 2.0% | 1,447,333 | Added |
| Goldman Sachs Group Inc | $8.7M | 1.9% | 1,372,300 | Added |
| Royce & Associates LP | $8.4M | 1.8% | 1,323,218 | Added |
| AQR Capital Management LLC | $8.1M | 1.7% | 1,276,346 | Added |
| Millennium Management LLC | $7.5M | 1.6% | 1,190,616 | Trimmed |
| Marshall Wace, LLP | $7.3M | 1.6% | 1,146,707 | Trimmed |
| D. E. Shaw & Co., Inc. | $6.8M | 1.5% | 1,066,501 | Added |
| Telemark Asset Management, LLC | $6.3M | 1.4% | 1,000,000 | Unchanged |
| JPMorgan Chase & Co | $6.0M | 1.4% | 1,004,383 | Added |
| BNP Paribas Financial Markets | $5.5M | 1.2% | 867,199 | Added |
| Two Sigma Investments, LP | $4.9M | 1.1% | 779,468 | Added |
Share of 13F holdings is each fund's shares as a share of the 73,421,942 ASPN shares all 13F filers reported, not of shares outstanding.
Biggest buyers in Q2 2026
- American Century Companies Inc Added+$8.0M
- Jacobs Levy Equity Management, Inc Added+$5.3M
- AQR Capital Management LLC Added+$4.8M
- Acadian Asset Management LLC New+$4.3M
- BlackRock, Inc. Added+$3.4M
- Goldman Sachs Group Inc Added+$3.0M
- Tudor Investment Corp Et Al Added+$2.6M
- Panagora Asset Management Inc Added+$2.6M
- Baird Financial Group, Inc. New+$2.2M
- Two Sigma Investments, LP Added+$2.1M
Biggest sellers in Q2 2026
- Needham Investment Management LLC Trimmed-$8.0M
- Invesco Ltd. Trimmed-$4.3M
- HRT Financial LP Sold out-$3.0M
- Samjo Management, LLC Sold out-$2.2M
- Citadel Advisors LLC Trimmed-$2.2M
- Gagnon Securities LLC Trimmed-$2.1M
- Palogic Value Management, L.P. Trimmed-$1.7M
- Point72 Asset Management, L.P. Trimmed-$1.6M
- Millennium Management LLC Trimmed-$1.4M
- UBS Group AG Trimmed-$777K
The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $69.5M and sold $36.5M; 60 added and 46 trimmed.
Schedule 13D and 13G filings on ASPN
Owners of more than 5% must file within days, so these can be newer than the 13F data.
- 2026-10-19HIRSCHMAN ORIN SCHEDULE 13G filed by Aspen Aerogels Inc.Schedule 13G
Questions about ASPN ownership
- Who owns ASPN stock?
- 180 institutional investment managers reported ASPN positions in their Form 13F filings for Q2 2026, holding 73,421,942 shares worth $465M in total. Kim, LLC reported the largest position.
- Are funds buying or selling ASPN?
- In Q2 2026, 38 managers opened new ASPN positions, 60 added, 46 trimmed and 21 sold out. Managers that filed in both quarters added a net 4,143,940 shares.
- How current is this ASPN institutional ownership data?
- It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to ASPN by CUSIP. Options are left out. ASPN news and filings · ASPN insider trades · Top funds