NORTHBOROUGH, MA
ASPEN AEROGELS INCASPN— Latest position per institution from SEC 13F filings
15
Institutional holders
66.42M
Total shares held
496.21M
Estimated value
3.32M
Avg. position size
KIM, LLC
CIK 1888968
Shares
12.28M
Value
42M
Filed
Mar 31, 2026
OAKTOP CAPITAL MANAGEMENT II, L.P.
CIK 1550660
Shares
5.17M
Value
17.68M
Filed
Mar 31, 2026
BLACKROCK, INC.
CIK 2012383
Shares
4.74M
Value
16.22M
Filed
Mar 31, 2026
VANGUARD GROUP INC
CIK 102909
Shares
4.69M
Value
13.26M
Filed
Dec 31, 2025
NEEDHAM INVESTMENT MANAGEMENT LLC
CIK 1167212
Shares
4.52M
Value
15.45M
Filed
Mar 31, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
4.49M
Value
107.14M
Filed
Jun 30, 2024
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
3.44M
Value
11.75M
Filed
Mar 31, 2026
GEORGE KAISER FAMILY FOUNDATION
CIK 1265376
Shares
3.17M
Value
10.83M
Filed
Mar 31, 2026
SAMJO CAPITAL LLC
CIK 1509943
Shares
3.02M
Value
25.93M
Filed
Sep 30, 2023
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 938206
Shares
2.55M
Value
70.63M
Filed
Sep 30, 2024
STATE STREET CORP
CIK 93751
Shares
2.32M
Value
7.94M
Filed
Mar 31, 2026
INVESCO LTD.
CIK 914208
Shares
2.30M
Value
7.86M
Filed
Mar 31, 2026
COWEN PRIME ADVISORS LLC
CIK 1875920
Shares
1.91M
Value
15.08M
Filed
Jun 30, 2023
GAGNON SECURITIES LLC
CIK 1125725
Shares
1.86M
Value
6.37M
Filed
Mar 31, 2026
AIGH CAPITAL MANAGEMENT LLC
CIK 1835943
Shares
1.80M
Value
28.47M
Filed
Dec 31, 2023
HOOD RIVER CAPITAL MANAGEMENT LLC
CIK 1578177
Shares
1.75M
Value
41.80M
Filed
Jun 30, 2024
ENCOMPASS CAPITAL ADVISORS LLC
CIK 1541901
Shares
1.70M
Value
47.16M
Filed
Sep 30, 2024
LOOMIS SAYLES & CO L P
CIK 312348
Shares
1.62M
Value
44.84K
Filed
Sep 30, 2024
RICE HALL JAMES & ASSOCIATES, LLC
CIK 1230765
Shares
1.55M
Value
5.31M
Filed
Mar 31, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
1.54M
Value
5.27M
Filed
Mar 31, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | KIM, LLC | 1888968 | 12.28M | 42M | Mar 31, 2026 |
| 2 | OAKTOP CAPITAL MANAGEMENT II, L.P. | 1550660 | 5.17M | 17.68M | Mar 31, 2026 |
| 3 | BLACKROCK, INC. | 2012383 | 4.74M | 16.22M | Mar 31, 2026 |
| 4 | VANGUARD GROUP INC | 102909 | 4.69M | 13.26M | Dec 31, 2025 |
| 5 | NEEDHAM INVESTMENT MANAGEMENT LLC | 1167212 | 4.52M | 15.45M | Mar 31, 2026 |
| 6 | BLACKROCK FINANCE, INC. | 1364742 | 4.49M | 107.14M | Jun 30, 2024 |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 3.44M | 11.75M | Mar 31, 2026 |
| 8 | GEORGE KAISER FAMILY FOUNDATION | 1265376 | 3.17M | 10.83M | Mar 31, 2026 |
| 9 | SAMJO CAPITAL LLC | 1509943 | 3.02M | 25.93M | Sep 30, 2023 |
| 10 | DRIEHAUS CAPITAL MANAGEMENT LLC | 938206 | 2.55M | 70.63M | Sep 30, 2024 |
| 11 | STATE STREET CORP | 93751 | 2.32M | 7.94M | Mar 31, 2026 |
| 12 | INVESCO LTD. | 914208 | 2.30M | 7.86M | Mar 31, 2026 |
| 13 | COWEN PRIME ADVISORS LLC | 1875920 | 1.91M | 15.08M | Jun 30, 2023 |
| 14 | GAGNON SECURITIES LLC | 1125725 | 1.86M | 6.37M | Mar 31, 2026 |
| 15 | AIGH CAPITAL MANAGEMENT LLC | 1835943 | 1.80M | 28.47M | Dec 31, 2023 |
| 16 | HOOD RIVER CAPITAL MANAGEMENT LLC | 1578177 | 1.75M | 41.80M | Jun 30, 2024 |
| 17 | ENCOMPASS CAPITAL ADVISORS LLC | 1541901 | 1.70M | 47.16M | Sep 30, 2024 |
| 18 | LOOMIS SAYLES & CO L P | 312348 | 1.62M | 44.84K | Sep 30, 2024 |
| 19 | RICE HALL JAMES & ASSOCIATES, LLC | 1230765 | 1.55M | 5.31M | Mar 31, 2026 |
| 20 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 1.54M | 5.27M | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.