X0206 3 2022-01-29 0 0001145986 ASPEN AEROGELS INC ASPN 0001628467 SCHILLING KEITH L 30 FORBES ROAD BUILDING B NORTHBOROUGH MA 01532 0 1 0 0 Sr. Vice President, Technology Common Stock 3564 D Stock Option (Right to Buy) 0.00 2031-11-02 Common Stock 6529 D Each Restricted Stock Unit ("RSU") represents the right to receive one share of Common Stock upon vesting. The RSUs vest as to one-third of the shares on November 2, 2022, an additional one-third of the shares on November 2, 2023 and the remaining one-third of the shares on November 2, 2024. The options vest as to one-third of the shares on November 2, 2022, an addition one-third of the shares on November 2, 2023 and the remaining one-third of the shares on November 2, 2024. /s/ Poongunran Muthukumaran, Attorney-in-Fact 2022-01-31