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
82,140,654
Price per share
$2.83
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
71,405,754
Total reported value
$497,064,440
% of total 13F portfolios
0%
Share change
-362,195
Value change
-$253,882
Number of holders
201
Price from insider filings
$2.83
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% $23,466,764 4,394,525 Oaktop Capital Management II, L.P. 31 Mar 2025
FMR LLC 1.5% $6,547,232 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, par value $0.00001 per share (ASPN). This represents 87% of the company’s total 82,140,654 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 69% 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 2.7% 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 1.6% 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/ 0.99% 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 0.84% 692,148 0% 0% $4,817,350
NORTHERN TRUST CORP 0.75% 613,598 +1.6% 0% $4,270,641

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 361,310 $1,022,216 -$472,853 $2.83 4
2025 Q3 71,405,754 $497,064,440 -$253,882 $6.96 201
2025 Q2 71,504,120 $423,792,194 -$835,709 $5.92 181
2025 Q1 71,206,827 $455,066,312 -$45,808,891 $6.39 217
2024 Q4 72,957,136 $867,253,407 -$106,067,396 $11.88 226
2024 Q3 69,401,033 $1,921,862,472 -$23,019,040 $27.69 240
2024 Q2 70,539,667 $1,682,260,831 -$86,709,633 $23.85 219
2024 Q1 74,247,102 $1,306,720,012 -$10,303,815 $17.60 163
2023 Q4 220,437 $3,478,496 -$1,578,000 $15.78 2
2023 Q3 67,761,111 $582,777,063 +$31,234,482 $8.60 155
2023 Q2 66,512,915 $524,617,000 -$10,872,368 $7.89 158
2023 Q1 67,188,531 $498,595,169 -$26,918,707 $7.45 154
2022 Q4 67,270,702 $793,028,363 +$354,105,500 $11.79 158
2022 Q3 36,276,280 $334,548,145 +$715,860 $9.22 124
2022 Q2 36,685,072 $362,036,999 -$37,362,116 $9.88 136
2022 Q1 31,674,095 $1,091,864,529 +$99,405,085 $34.48 137
2021 Q4 28,529,908 $1,420,617,488 +$23,552,977 $49.79 156
2021 Q3 27,575,417 $1,268,480,803 -$1,019,571 $46.01 128
2021 Q2 28,401,237 $849,422,727 +$128,720,709 $29.92 112
2021 Q1 23,708,294 $482,204,043 +$37,544,189 $20.34 83
2020 Q4 21,883,465 $365,235,946 +$23,255,558 $16.69 74
2020 Q3 18,757,830 $205,399,920 +$9,300,625 $10.95 68
2020 Q2 18,203,887 $119,771,961 +$4,585,853 $6.58 65
2020 Q1 17,581,854 $107,950,860 +$10,732,914 $6.14 59
2019 Q4 16,704,164 $129,617,086 +$3,000,594 $7.76 48
2019 Q3 16,421,121 $97,214,829 +$2,077,392 $5.92 40
2019 Q2 16,067,293 $114,557,998 -$775,454 $7.13 33
2019 Q1 16,264,254 $41,473,357 +$464,601 $2.55 34
2018 Q4 16,268,661 $34,654,000 -$2,674,499 $2.13 34
2018 Q3 16,486,035 $75,341,000 -$863,028 $4.57 42
2018 Q2 16,677,530 $81,720,000 -$336,826 $4.90 44
2018 Q1 16,755,933 $71,686,000 +$232,409 $4.27 48
2017 Q4 16,723,133 $81,609,000 -$2,427,053 $4.88 47
2017 Q3 17,543,276 $76,305,000 +$30,137 $4.35 49
2017 Q2 17,515,068 $77,854,000 +$73,254 $4.45 43
2017 Q1 16,988,166 $70,500,000 +$3,765,201 $4.15 40
2016 Q4 17,165,002 $70,898,000 -$7,512,282 $4.13 50
2016 Q3 17,557,373 $104,642,000 +$709,599 $5.96 52
2016 Q2 17,731,033 $88,125,000 -$744,145 $4.97 57
2016 Q1 17,935,512 $80,706,000 -$4,112,452 $4.50 51
2015 Q4 18,520,450 $112,421,000 +$1,185,731 $6.07 45
2015 Q3 18,246,842 $136,824,338 -$596,940 $7.50 52
2015 Q2 18,286,056 $121,032,996 -$3,205,226 $6.62 38
2015 Q1 18,811,423 $137,038,953 -$3,131,297 $7.28 39
2014 Q4 19,238,899 $153,400,249 -$2,659,813 $7.98 35
2014 Q3 19,471,422 $196,270,000 +$65,398 $10.08 41
2014 Q2 19,382,265 $214,120,250 +$214,120,512 $11.05 28