Aspen Aerogels Inc. 13F holders
179 funds reported a position in Aspen Aerogels Inc. in their 13F for the quarter ended 30 June 2026, together 73.6 million shares worth $466.0 million. Against the quarter before, 36 opened a position, 61 added, 45 trimmed and 22 sold out; together they bought a net 4.4 million shares. The largest holders: Kim, LLC, BlackRock, Inc. and Oaktop Capital Management II, L.P.
Funds holding179+13 on Q1 2026
Shares they held73.6Mworth $466.0 million
Net bought on the quarter4.4M sharesabout $27.9 million at the funds' values
Funds buying to selling97 to 67opened or added, to cut or sold
Opened 36Added 61Held 37Trimmed 45Sold out 22
What each fund did in ASPN against its 13F for the quarter before; a change under 0.1% of a holding counts as held
Funds reporting a position in ASPN in their 13F, each quarter; hover a bar for the shares they held
Filed so far for the quarter to 30 September 2026
3,405 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 28 reported a position in Aspen Aerogels Inc.: 3 opened one, 7 added, 9 trimmed and 6 sold out, a net 92,462 shares bought.
The largest moves in the name among the funds that have filed, against each fund's previous 13F.
The well-known funds
Of the 44 funds followed here, 7 reported a position in Aspen Aerogels Inc. in a 13F for the quarter ended 30 June 2026. The largest: Geode Capital Management, 1.8 million shares worth $11.2 million, 0.0% of its reported book. New this quarter: Renaissance Technologies. In the quarter, 4 funds added or opened a position and 3 trimmed or sold out; together they bought a net 101,952 shares, about $646,376 at the funds' own value per share on 30 June 2026. A change under 0.1% of a holding counts as held.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| Geode Capital Management | 1,770,425 | $11.2 million | 0.0% | +229,654 | added | 30 June 2026 | 13F |
| Millennium Management | 1,190,616 | $7.5 million | 0.0% | -214,059 | trimmed | 30 June 2026 | 13F |
| Two Sigma Investments | 779,468 | $4.9 million | 0.0% | +338,032 | added | 30 June 2026 | 13F |
| Renaissance Technologies | 274,392 | $1.7 million | 0.0% | +274,392 | new | 30 June 2026 | 13F |
| Citadel Advisors | 238,731 | $1.5 million | 0.0% | -342,456 | trimmed | 30 June 2026 | 13F |
| FMR LLC | 68,476 | $434,135 | 0.0% | +63,997 | added | 30 June 2026 | 13F |
| Point72 Asset Management | 9,006 | $57,098 | 0.0% | -247,608 | trimmed | 30 June 2026 | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.The largest holders
| Fund | Shares | Share of all | Value | Of its book | Change in shares | Filing |
|---|---|---|---|---|---|---|
| Kim, LLC | 12,280,426 | 16.68% | $77.9 million | 22.21% | no change | 13F |
| BlackRock, Inc. | 5,277,148 | 7.17% | $33.5 million | 0.00% | +534,072 | 13F |
| Oaktop Capital Management II, L.P. | 5,168,674 | 7.02% | $32.8 million | 1.39% | no change | 13F |
| Vanguard Capital Management LLC | 3,539,271 | 4.81% | $22.4 million | 0.00% | +103,115 | 13F |
| Needham Investment Management LLC | 3,260,800 | 4.43% | $20.7 million | 0.62% | -1,257,975 | 13F |
| George Kaiser Family Foundation | 3,167,322 | 4.30% | $20.1 million | 1.93% | no change | 13F |
| State Street Corp. | 2,559,495 | 3.48% | $16.2 million | 0.00% | +238,768 | 13F |
| American Century Companies Inc. | 2,510,042 | 3.41% | $15.9 million | 0.01% | +1,262,259 | 13F |
| Jacobs Levy Equity Management, Inc. | 2,058,083 | 2.80% | $13.0 million | 0.05% | +839,304 | 13F |
| Ameriprise Financial Inc. | 1,821,295 | 2.47% | $11.5 million | 0.00% | +314,916 | 13F |
| Geode Capital Management, LLC | 1,770,425 | 2.41% | $11.2 million | 0.00% | +229,654 | 13F |
| Rice Hall James & Associates, LLC | 1,635,259 | 2.22% | $10.4 million | 0.51% | +82,631 | 13F |
| Invesco Ltd. | 1,619,972 | 2.20% | $10.3 million | 0.00% | -678,211 | 13F |
| Gagnon Securities LLC | 1,535,812 | 2.09% | $9.7 million | 1.88% | -326,039 | 13F |
| Dimensional Fund Advisors LP | 1,447,333 | 1.97% | $9.2 million | 0.00% | +190,853 | 13F |
| Goldman Sachs Group Inc. | 1,372,300 | 1.86% | $8.7 million | 0.00% | +472,787 | 13F |
| Royce & Associates LP | 1,323,218 | 1.80% | $8.4 million | 0.07% | +336,705 | 13F |
| AQR Capital Management LLC | 1,276,346 | 1.73% | $8.1 million | 0.00% | +750,227 | 13F |
| Millennium Management LLC | 1,190,616 | 1.62% | $7.5 million | 0.01% | -214,059 | 13F |
| Marshall Wace, LLP | 1,146,707 | 1.56% | $7.3 million | 0.01% | -116,395 | 13F |
| D. E. Shaw & Co., Inc. | 1,066,501 | 1.45% | $6.8 million | 0.00% | +232,929 | 13F |
| Telemark Asset Management, LLC | 1,000,000 | 1.36% | $6.3 million | 0.46% | no change | 13F |
| JPMorgan Chase & Co. | 1,004,383 | 1.36% | $6.0 million | 0.00% | +38,891 | 13F |
| BNP Paribas Financial Markets | 867,199 | 1.18% | $5.5 million | 0.00% | +169,267 | 13F |
| Two Sigma Investments, LP | 779,468 | 1.06% | $4.9 million | 0.00% | +338,032 | 13F |
| Vanguard Portfolio Management LLC | 698,983 | 0.95% | $4.4 million | 0.00% | -17,749 | 13F |
| Acadian Asset Management LLC | 684,915 | 0.93% | $4.3 million | 0.01% | new | 13F |
| Federated Hermes, Inc. | 596,883 | 0.81% | $3.8 million | 0.01% | +146,847 | 13F |
| Charles Schwab Investment Management Inc. | 570,712 | 0.78% | $3.6 million | 0.00% | +13,987 | 13F |
| Tudor Investment Corp. Et Al | 567,384 | 0.77% | $3.6 million | 0.01% | +416,291 | 13F |
| Northern Trust Corp. | 565,569 | 0.77% | $3.6 million | 0.00% | +42,147 | 13F |
| Vanguard Fiduciary Trust Co. | 474,393 | 0.64% | $3.0 million | 0.00% | +19,991 | 13F |
| Panagora Asset Management Inc. | 442,448 | 0.60% | $2.8 million | 0.01% | +414,545 | 13F |
| Morgan Stanley | 397,075 | 0.54% | $2.5 million | 0.00% | +208,769 | 13F |
| Deutsche Bank AG | 372,077 | 0.51% | $2.4 million | 0.00% | +12,542 | 13F |
| Palogic Value Management, L.P. | 371,178 | 0.50% | $2.4 million | 0.42% | 13F | |
| Baird Financial Group, Inc. | 345,193 | 0.47% | $2.2 million | 0.00% | new | 13F |
| Algert Global LLC | 302,582 | 0.41% | $1.9 million | 0.02% | -23,828 | 13F |
| Trexquant Investment LP | 302,439 | 0.41% | $1.9 million | 0.01% | new | 13F |
| Renaissance Technologies LLC | 274,392 | 0.37% | $1.7 million | 0.00% | new | 13F |
| Bank of America Corp. | 252,746 | 0.34% | $1.6 million | 0.00% | +11,726 | 13F |
| Citadel Advisors LLC | 238,731 | 0.32% | $1.5 million | 0.00% | -342,456 | 13F |
| Prudential Financial Inc. | 229,935 | 0.31% | $1.5 million | 0.00% | +219,780 | 13F |
| XTX Topco Ltd | 227,977 | 0.31% | $1.4 million | 0.02% | +26,610 | 13F |
| First Trust Advisors LP | 222,352 | 0.30% | $1.4 million | 0.00% | +41,118 | 13F |
| Bank of New York Mellon Corp | 195,389 | 0.27% | $1.2 million | 0.00% | +9,716 | 13F |
| Citigroup Inc. | 181,651 | 0.25% | $1.2 million | 0.00% | -52,014 | 13F |
| Ironwood Investment Management LLC | 179,301 | 0.24% | $1.1 million | 0.39% | +12,655 | 13F |
| Susquehanna International Group, LLP | 177,419 | 0.24% | $1.1 million | 0.00% | -96,898 | 13F |
| Arrowstreet Capital, Limited Partnership | 171,150 | 0.23% | $1.1 million | 0.00% | new | 13F |
The 50 largest of the 179 funds that reported a position in ASPN in their 13F for the quarter ended 30 June 2026, by the value each reported.
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Share of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?Options the funds reported on ASPN
| Fund | Option | Shares under the options | Value of those shares | Quarter ended | Filing |
|---|---|---|---|---|---|
| Citadel Advisors | Calls | 182,200 | $1.2 million | 30 June 2026 | 13F |
| Citadel Advisors | Puts | 60,800 | $385,472 | 30 June 2026 | 13F |
| Point72 Asset Management | Calls | 6,200 | $39,308 | 30 June 2026 | 13F |
A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost.
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They are not counted in the holdings above. A put gains when the stock falls, a call when it rises, and a fund may hold either to hedge.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 19 October 2026 | 13G | Orin Hirschman and 3 others | 7.2 million | 8.6% | 30 September 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 24 September 2026 | 13D/A | Wood River Capital, LLC and 1 other | 0 | 0.0% | 23 September 2026 | Item 4 of the Initial Schedule 13D is hereby amended and supplemented as follows: On September 23, 2026, the Reporting Persons disposed of all Public Shares beneficially owned by the Reporting Persons and ceased to be the beneficial owner o | EDGAR |
| 13 August 2026 | 13G/A | Needham Investment Management L.L.C. and 5 others | 3.3 million | 3.9% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 26 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 13 February 2026 | 13G | Needham Investment Management L.L.C. and 5 others | 4.4 million | 5.3% | 31 December 2025 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13GFails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 11 August 2026 | 198 | $6.29 | SEC |
| 7 August 2026 | 18,393 | $6.89 | SEC |
| 6 August 2026 | 4,378 | $5.01 | SEC |
| 5 August 2026 | 25,802 | $5.06 | SEC |
| 3 August 2026 | 1,552 | $4.63 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.