| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| OAKTOP CAPITAL MANAGEMENT II, L.P. | 5.4% | $23,994,106 | 4,394,525 | Oaktop Capital Management II, L.P. | 31 Mar 2025 | |||
| FMR LLC | 1.5% | $6,694,361 | 1,226,073 | FMR LLC | 31 Dec 2024 |
As of 30 Sep 2025, 201 institutional investors reported holding 71,405,754 shares of ASPEN AEROGELS INC - COMMON STOCK (ASPN). This represents 87% of the company’s total 81,738,225 outstanding shares.
The largest institutional shareholders of ASPEN AEROGELS INC - COMMON STOCK (ASPN) together control 70% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| KIM, LLC | 15% | 12,280,426 | 0% | 9.6% | $85,471,765 |
| BlackRock, Inc. | 6.1% | 4,977,558 | +0.01% | 0% | $34,643,803 |
| VANGUARD GROUP INC | 5.5% | 4,510,370 | +0.51% | 0% | $31,392,177 |
| OAKTOP CAPITAL MANAGEMENT II, L.P. | 5.4% | 4,394,525 | 0% | 2.8% | $30,585,894 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | 4.2% | 3,439,700 | +14% | 1.7% | $23,940,312 |
| George Kaiser Family Foundation | 3.9% | 3,167,322 | 0% | 3.1% | $22,044,561 |
| DIMENSIONAL FUND ADVISORS LP | 2.8% | 2,252,013 | -8% | 0% | $15,674,611 |
| STATE STREET CORP | 2.4% | 1,944,636 | +1.2% | 0% | $13,534,667 |
| Telemark Asset Management, LLC | 2.2% | 1,792,424 | 0% | 1.2% | $12,475,271 |
| GAGNON SECURITIES LLC | 2.1% | 1,754,833 | -7.6% | 2.5% | $12,213,638 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.9% | 1,584,871 | +0.13% | 0% | $11,032,256 |
| AWM Investment Company, Inc. | 1.9% | 1,555,477 | +8.4% | 1% | $10,826,120 |
| MILLENNIUM MANAGEMENT LLC | 1.8% | 1,447,517 | +60% | 0.01% | $10,074,718 |
| GOLDMAN SACHS GROUP INC | 1.7% | 1,419,804 | -36% | 0% | $9,881,836 |
| RICE HALL JAMES & ASSOCIATES, LLC | 1.7% | 1,407,726 | -8.9% | 0.53% | $9,797,769 |
| JPMORGAN CHASE & CO | 1.7% | 1,349,749 | +8.3% | 0% | $9,394,254 |
| Invesco Ltd. | 1.5% | 1,222,376 | +47% | 0% | $8,507,737 |
| CITADEL ADVISORS LLC | 1.4% | 1,114,590 | +584% | 0.01% | $7,757,546 |
| Penn Capital Management Company, LLC | 1.3% | 1,036,995 | +39% | 0.56% | $7,225,251 |
| BANK OF AMERICA CORP /DE/ | 1% | 814,849 | -0.41% | 0% | $5,671,349 |
| TWO SIGMA INVESTMENTS, LP | 0.99% | 811,528 | +5.2% | 0.01% | $5,648,235 |
| NEW YORK STATE COMMON RETIREMENT FUND | 0.88% | 720,024 | +46% | 0.01% | $5,011,367 |
| MORGAN STANLEY | 0.85% | 694,488 | -1.6% | 0% | $4,833,641 |
| BNP PARIBAS FINANCIAL MARKETS | 0.85% | 692,148 | 0% | 0% | $4,817,350 |
| NORTHERN TRUST CORP | 0.75% | 613,598 | +1.6% | 0% | $4,270,641 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 361,310 | $1,022,216 | -$105,970 | $2.83 | 4 |
| 2025 Q3 | 71,405,754 | $497,064,440 | -$253,889 | $6.96 | 201 |
| 2025 Q2 | 71,504,120 | $423,792,194 | -$835,712 | $5.92 | 181 |
| 2025 Q1 | 71,206,827 | $455,066,397 | -$45,808,861 | $6.39 | 217 |
| 2024 Q4 | 73,001,355 | $867,778,873 | -$105,657,383 | $11.88 | 228 |
| 2024 Q3 | 69,401,034 | $1,921,862,940 | -$22,829,124 | $27.69 | 238 |
| 2024 Q2 | 70,532,807 | $1,682,097,439 | -$78,212,843 | $23.85 | 216 |
| 2024 Q1 | 74,247,101 | $1,306,720,369 | -$2,830,981 | $17.60 | 162 |
| 2023 Q4 | 74,870,231 | $1,181,354,395 | +$136,924,909 | $15.78 | 166 |
| 2023 Q3 | 67,761,200 | $582,778,595 | +$28,805,579 | $8.60 | 157 |
| 2023 Q2 | 66,512,915 | $524,617,340 | -$10,871,982 | $7.89 | 158 |
| 2023 Q1 | 67,189,026 | $498,597,203 | -$26,918,463 | $7.45 | 155 |
| 2022 Q4 | 67,314,459 | $793,543,467 | +$354,475,790 | $11.79 | 160 |
| 2022 Q3 | 37,314,044 | $344,117,328 | +$407,623 | $9.22 | 129 |
| 2022 Q2 | 37,073,093 | $366,274,596 | -$154,400,198 | $9.88 | 140 |
| 2022 Q1 | 31,696,973 | $1,092,653,529 | +$98,738,568 | $34.48 | 139 |
| 2021 Q4 | 28,529,908 | $1,420,617,488 | +$23,952,968 | $49.79 | 156 |
| 2021 Q3 | 27,563,849 | $1,268,080,803 | -$1,101,618 | $46.01 | 127 |
| 2021 Q2 | 28,413,761 | $849,796,727 | +$128,951,542 | $29.92 | 113 |
| 2021 Q1 | 23,708,215 | $482,202,043 | +$36,805,215 | $20.34 | 83 |
| 2020 Q4 | 21,889,127 | $365,972,946 | +$23,787,605 | $16.69 | 75 |
| 2020 Q3 | 19,785,359 | $216,652,920 | +$7,771,398 | $10.95 | 70 |
| 2020 Q2 | 19,371,151 | $127,452,961 | +$4,920,549 | $6.58 | 66 |
| 2020 Q1 | 18,698,262 | $114,805,860 | +$12,104,709 | $6.14 | 60 |
| 2019 Q4 | 16,704,164 | $129,617,086 | +$3,000,579 | $7.76 | 48 |
| 2019 Q3 | 16,421,121 | $97,214,829 | +$2,077,389 | $5.92 | 40 |
| 2019 Q2 | 16,067,293 | $114,557,998 | -$775,410 | $7.13 | 33 |
| 2019 Q1 | 16,264,254 | $41,473,357 | +$462,305 | $2.55 | 34 |
| 2018 Q4 | 16,268,661 | $34,654,000 | -$2,674,185 | $2.13 | 34 |
| 2018 Q3 | 16,533,099 | $75,556,000 | -$838,545 | $4.57 | 43 |
| 2018 Q2 | 16,717,271 | $81,915,000 | -$334,389 | $4.90 | 45 |
| 2018 Q1 | 16,857,273 | $72,118,000 | +$391,285 | $4.27 | 50 |
| 2017 Q4 | 16,760,070 | $81,789,000 | -$2,427,044 | $4.88 | 48 |
| 2017 Q3 | 17,580,213 | $76,466,000 | +$30,156 | $4.35 | 50 |
| 2017 Q2 | 17,552,005 | $78,018,000 | +$74,932 | $4.45 | 44 |
| 2017 Q1 | 17,469,551 | $72,498,000 | +$5,754,386 | $4.15 | 42 |
| 2016 Q4 | 17,165,402 | $70,900,000 | -$7,510,166 | $4.13 | 51 |
| 2016 Q3 | 17,557,373 | $104,642,000 | +$709,552 | $5.96 | 52 |
| 2016 Q2 | 17,731,033 | $88,125,000 | -$744,179 | $4.97 | 57 |
| 2016 Q1 | 17,935,512 | $80,706,000 | -$4,112,514 | $4.50 | 51 |
| 2015 Q4 | 18,520,450 | $112,421,000 | +$1,185,718 | $6.07 | 45 |
| 2015 Q3 | 18,246,842 | $136,824,338 | -$791,293 | $7.50 | 52 |
| 2015 Q2 | 18,369,731 | $121,586,996 | -$3,205,170 | $6.62 | 41 |
| 2015 Q1 | 18,811,648 | $137,040,953 | -$3,131,332 | $7.28 | 40 |
| 2014 Q4 | 19,238,899 | $153,400,249 | -$2,659,830 | $7.98 | 35 |
| 2014 Q3 | 19,471,422 | $196,270,000 | +$65,390 | $10.08 | 41 |
| 2014 Q2 | 19,382,265 | $214,120,250 | +$214,120,250 | $11.05 | 28 |