X0609 4 2026-05-15 0 0001781162 Momentus Inc. MNTS 0001786113 Kabot Brian false 1345 ABBOT KINNEY BLVD. VENICE CA 90291 1 0 0 0 0 Class A Common Stock 2026-05-15 4 P 0 1850 5.4046 A 3295 D This transaction was executed in multiple trades at prices ranging from $5.275 to $5.6099. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. The reporting person was previously reported as a beneficial owner of securities held by SRC-NI Holdings, LLC. The number of shares reported in Column 5 as direct ownership is greater than previously reported due to a distribution of shares by SRC-NI Holdings, LLC to its investors. /s/ Brian Kabot 2026-05-19