NORTHBOROUGH, MA
ASPEN AEROGELS INCASPN— Latest position per institution from SEC 13F filings
15
Institutional holders
66.96M
Total shares held
635.09M
Estimated value
3.35M
Avg. position size
KIM, LLC
CIK 1888968
Shares
12.28M
Value
77.86M
Filed
Jun 30, 2026
BLACKROCK, INC.
CIK 2012383
Shares
5.28M
Value
33.46M
Filed
Jun 30, 2026
OAKTOP CAPITAL MANAGEMENT II, L.P.
CIK 1550660
Shares
5.17M
Value
32.77M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
4.69M
Value
13.26M
Filed
Dec 31, 2025
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
4.49M
Value
107.14M
Filed
Jun 30, 2024
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
3.54M
Value
22.44M
Filed
Jun 30, 2026
NEEDHAM INVESTMENT MANAGEMENT LLC
CIK 1167212
Shares
3.26M
Value
20.67M
Filed
Jun 30, 2026
GEORGE KAISER FAMILY FOUNDATION
CIK 1265376
Shares
3.17M
Value
20.08M
Filed
Jun 30, 2026
SAMJO CAPITAL LLC
CIK 1509943
Shares
3.02M
Value
25.93M
Filed
Sep 30, 2023
STATE STREET CORP
CIK 93751
Shares
2.56M
Value
16.23M
Filed
Jun 30, 2026
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 938206
Shares
2.55M
Value
70.63M
Filed
Sep 30, 2024
AMERICAN CENTURY COMPANIES INC
CIK 748054
Shares
2.51M
Value
15.91M
Filed
Jun 30, 2026
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 884414
Shares
2.06M
Value
13.05M
Filed
Jun 30, 2026
COWEN PRIME ADVISORS LLC
CIK 1875920
Shares
1.91M
Value
15.08M
Filed
Jun 30, 2023
AMERIPRISE FINANCIAL INC
CIK 820027
Shares
1.82M
Value
11.55M
Filed
Jun 30, 2026
AIGH CAPITAL MANAGEMENT LLC
CIK 1835943
Shares
1.80M
Value
28.47M
Filed
Dec 31, 2023
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
1.77M
Value
11.23M
Filed
Jun 30, 2026
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
RICE HALL JAMES & ASSOCIATES, LLC
CIK 1230765
Shares
1.64M
Value
10.37M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | KIM, LLC | 1888968 | 12.28M | 77.86M | Jun 30, 2026 |
| 2 | BLACKROCK, INC. | 2012383 | 5.28M | 33.46M | Jun 30, 2026 |
| 3 | OAKTOP CAPITAL MANAGEMENT II, L.P. | 1550660 | 5.17M | 32.77M | Jun 30, 2026 |
| 4 | VANGUARD GROUP INC | 102909 | 4.69M | 13.26M | Dec 31, 2025 |
| 5 | BLACKROCK FINANCE, INC. | 1364742 | 4.49M | 107.14M | Jun 30, 2024 |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 3.54M | 22.44M | Jun 30, 2026 |
| 7 | NEEDHAM INVESTMENT MANAGEMENT LLC | 1167212 | 3.26M | 20.67M | Jun 30, 2026 |
| 8 | GEORGE KAISER FAMILY FOUNDATION | 1265376 | 3.17M | 20.08M | Jun 30, 2026 |
| 9 | SAMJO CAPITAL LLC | 1509943 | 3.02M | 25.93M | Sep 30, 2023 |
| 10 | STATE STREET CORP | 93751 | 2.56M | 16.23M | Jun 30, 2026 |
| 11 | DRIEHAUS CAPITAL MANAGEMENT LLC | 938206 | 2.55M | 70.63M | Sep 30, 2024 |
| 12 | AMERICAN CENTURY COMPANIES INC | 748054 | 2.51M | 15.91M | Jun 30, 2026 |
| 13 | JACOBS LEVY EQUITY MANAGEMENT, INC | 884414 | 2.06M | 13.05M | Jun 30, 2026 |
| 14 | COWEN PRIME ADVISORS LLC | 1875920 | 1.91M | 15.08M | Jun 30, 2023 |
| 15 | AMERIPRISE FINANCIAL INC | 820027 | 1.82M | 11.55M | Jun 30, 2026 |
| 16 | AIGH CAPITAL MANAGEMENT LLC | 1835943 | 1.80M | 28.47M | Dec 31, 2023 |
| 17 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 1.77M | 11.23M | Jun 30, 2026 |
| 18 | HOOD RIVER CAPITAL MANAGEMENT LLC | 1578177 | 1.75M | 41.80M | Jun 30, 2024 |
| 19 | ENCOMPASS CAPITAL ADVISORS LLC | 1541901 | 1.70M | 47.16M | Sep 30, 2024 |
| 20 | RICE HALL JAMES & ASSOCIATES, LLC | 1230765 | 1.64M | 10.37M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.