ASPEN AEROGELS INC

Filing Date

Oct 2, 2025

Transaction Date

Oct 1, 2025

Accession Number

0001193125-25-228693

Form Type

3

Footnotes

1. (F1)These options to purchase shares of our common stock were granted on November 2, 2021 and vested as to one-third of the shares on each anniversary of the grant date until November 2, 2024.
2. (F2)These options to purchase shares of our common stock were granted on February 23, 2022 and vested as to one-third of the shares on each anniversary of the grant date until February 23, 2025.
3. (F3)These options to purchase shares of our common stock were granted on March 8, 2023 and vested as to one-third of the shares on each anniversary of the grant date until March 8, 2026.
4. (F4)These options to purchase shares of our common stock were granted on March 5, 2024 and vested as to one-third of the shares on each anniversary of the grant date until March 5, 2027.
5. (F5)These options to purchase shares of our common stock were granted on March 5, 2025 and vested as to one-third of the shares on each anniversary of the grant date until March 5, 2028.
6. (F6)Each performance share unit ("PSU") represents a contingent right to receive one share of Common Stock upon vesting. The PSUs vest on March 5, 2028, following the completion of the performance period, which begins on January 1, 2025 and ends on December 31, 2027. Ranging between 0-200% of the target number of PSUs (as reflected in Table II above), the PSUs vest based on the total shareholder return of Common Stock relative to the total stockholder return of the components of the Russell 2000 Index.