ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN) Institutional Ownership

13F Institutional Holders and Ownership History from Q2 2014 to Q4 2025

Type / Class
Equity / Common Stock, par value $0.00001 per share
Symbol
ASPN on NYSE
Shares outstanding
82,107,547
Price per share
$3.45
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
69,937,910
Total reported value
$197,934,346
% of total 13F portfolios
0%
Share change
-1,527,247
Value change
-$24,442,457
Number of holders
176
Price from insider filings
$3.45
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN) based on Schedule 13D/G filings

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
NEEDHAM INVESTMENT MANAGEMENT LLC 5.3% $14,360,610 4,351,700 NEEDHAM INVESTMENT MANAGEMENT L.L.C. 31 Dec 2025
FMR LLC 1.5% $6,694,361 1,226,073 FMR LLC 31 Dec 2024

As of 31 Dec 2025, 176 institutional investors reported holding 69,937,910 shares of ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN). This represents 85% of the company’s total 82,107,547 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN) together control 72% 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% 4% $34,753,606
BlackRock, Inc. 6% 4,929,239 -0.97% 0% $13,949,748
VANGUARD GROUP INC 5.7% 4,685,950 +3.9% 0% $13,261,239
OAKTOP CAPITAL MANAGEMENT II, L.P. 5.4% 4,394,525 0% 1.1% $12,436,506
NEEDHAM INVESTMENT MANAGEMENT LLC 5.3% 4,351,700 +27% 0.78% $12,315,311
Invesco Ltd. 5% 4,129,934 +238% 0% $11,687,713
George Kaiser Family Foundation 3.9% 3,167,322 0% 1.2% $8,963,521
STATE STREET CORP 3% 2,501,469 +29% 0% $7,079,157
DIMENSIONAL FUND ADVISORS LP 2.4% 2,003,963 -11% 0% $5,671,810
GEODE CAPITAL MANAGEMENT, LLC 2% 1,602,049 +1.1% 0% $4,534,863
JPMORGAN CHASE & CO 1.8% 1,483,745 +9.9% 0% $4,198,998
RICE HALL JAMES & ASSOCIATES, LLC 1.7% 1,421,605 +0.99% 0.22% $4,023,142
AMERIPRISE FINANCIAL INC 1.7% 1,378,284 0% $3,900,544
GOLDMAN SACHS GROUP INC 1.6% 1,294,928 -8.8% 0% $3,664,647
AMERICAN CENTURY COMPANIES INC 1.4% 1,157,978 +146% 0% $3,277,078
GAGNON SECURITIES LLC 1.4% 1,133,248 -35% 0.65% $3,207,092
Telemark Asset Management, LLC 1.2% 1,000,000 -44% 0.28% $2,830,000
MILLENNIUM MANAGEMENT LLC 1.1% 870,951 -40% 0% $2,464,791
CITADEL ADVISORS LLC 1.1% 866,218 -22% 0% $2,451,397
Samjo Management, LLC 0.97% 798,525 +134% 0.88% $2,259,826
TWO SIGMA INVESTMENTS, LP 0.92% 757,419 -6.7% 0% $2,143,496
BANK OF AMERICA CORP /DE/ 0.92% 752,430 -7.7% 0% $2,129,377
BNP PARIBAS FINANCIAL MARKETS 0.84% 691,270 0% 0% $1,956,294
First Eagle Investment Management, LLC 0.76% 622,487 +20% 0% $1,761,638
FEDERATED HERMES, INC. 0.69% 564,486 +95% 0% $1,597,495

Institutional Holders of ASPEN AEROGELS INC - Common Stock, par value $0.00001 per share (ASPN) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 69,937,910 $197,934,346 -$24,442,457 $2.83 176
2025 Q3 71,426,098 $497,205,882 -$112,539 $6.96 203
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