144 0001751631 XXXXXXXX LIVE 0001781162 Momentus Inc. 001-39128 1345 ABBOT KINNEY BLVD. VENICE BEACH CA 90291 2137936507 Prime Movers Lab Fund I LP 10% Stockholder Common Cantor Fitzgerald & Co

110 East 59th St New York NY 10022

15166661 4549998.00 15166661 06/07/2023 SEC Common 11/01/2018 Purchase Prime Movers Lab Fund I LP N 3480785 11/01/2018 Cash Common 05/01/2019 Purchase Prime Movers Lab Fund I LP N 5311001 05/01/2019 Cash Common 06/21/2019 Purchase Prime Movers Lab Fund I LP N 6373201 06/21/2019 Cash Common 07/31/2020 Purchase Prime Movers Lab Fund I LP N 913473 07/31/2020 Cash Y 06/07/2023 06/07/2023 Dakin Sloss