0001781162 2026-05-19 2026-05-19 0001781162 mnts:WarrantsMember 2026-05-19 2026-05-19 0001781162 us-gaap:CommonClassAMember 2026-05-19 2026-05-19 false 0001781162 NASDAQ NASDAQ 8-K 2026-05-19 Momentus Inc. DE 001-39128 84-1905538 1762 Automation Parkway San Jose CA 95131 650 564-7820 false false false false Class A common stock MNTS Warrants MNTSW false