| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G | 2024-01-31 | BlackRock Inc. | ASPEN AEROGELS INC | 4,054,986 | 5.3% | EDGAR |
| SC 13G/A | 2023-02-14 | OAKTOP CAPITAL MANAGEMENT II, L.P. | ASPEN AEROGELS INC | 3,194,758 | 4.8% | EDGAR |
| SC 13G/A | 2023-02-14 | Encompass Capital Advisors LLC | ASPEN AEROGELS INC | 2,974,749 | 4.5% | EDGAR |
| SC 13G/A | 2023-02-03 | Telemark Asset Management, LLC | ASPEN AEROGELS INC | - | 3.0% | EDGAR |
| SC 13G/A | 2023-02-03 | Telemark Asset Management, LLC | ASPEN AEROGELS INC | - | 3.0% | EDGAR |
| SC 13D/A | 2022-12-07 | Wood River Capital, LLC | ASPEN AEROGELS INC | 19,218,658 | 27.6% | EDGAR |
| SC 13G | 2022-07-08 | Encompass Capital Advisors LLC | ASPEN AEROGELS INC | 2,734,074 | 7.6% | EDGAR |
| SC 13D/A | 2022-05-03 | SPRING CREEK CAPITAL LLC | ASPEN AEROGELS INC | 0 | 0.0% | EDGAR |
| SC 13D | 2022-04-05 | SPRING CREEK CAPITAL LLC | ASPEN AEROGELS INC | 3,462,124 | 9.7% | EDGAR |
| SC 13G/A | 2022-02-22 | SPRING CREEK CAPITAL LLC | ASPEN AEROGELS INC | 3,462,124 | 9.6% | EDGAR |
| SC 13G/A | 2022-02-09 | SPRING CREEK CAPITAL LLC | ASPEN AEROGELS INC | 3,462,124 | 10.5% | EDGAR |
| SC 13G/A | 2022-01-28 | Telemark Asset Management, LLC | ASPEN AEROGELS INC | - | 5.6% | EDGAR |
| SC 13G/A | 2021-09-09 | BlackRock Inc. | ASPEN AEROGELS INC | 1,523,575 | 4.6% | EDGAR |
| SC 13G | 2021-07-09 | SPRING CREEK CAPITAL LLC | ASPEN AEROGELS INC | 3,462,124 | 10.9% | EDGAR |
| SC 13G/A | 2021-02-12 | Telemark Asset Management, LLC | ASPEN AEROGELS INC | - | 8.3% | EDGAR |
| SC 13G | 2021-02-02 | BlackRock Inc. | ASPEN AEROGELS INC | 1,800,974 | 6.7% | EDGAR |
| SC 13G/A | 2020-02-05 | Telemark Asset Management, LLC | ASPEN AEROGELS INC | - | 7.1% | EDGAR |
| SC 13G | 2020-02-04 | OAKTOP CAPITAL MANAGEMENT II, L.P. | ASPEN AEROGELS INC | 2,593,272 | 10.7% | EDGAR |
| SC 13G/A | 2020-01-23 | LEVITICUS PARTNERS L P | ASPEN AEROGELS INC | 1,108,505 | 4.6% | EDGAR |
| SC 13G | 2019-12-04 | LEVITICUS PARTNERS L P | ASPEN AEROGELS INC | 1,108,505 | 4.6% | EDGAR |