Momentus Results Presentation Deck

CY 2023 GAAP to Non- GAAP Reconciliations View from Vigoride-5 Quarterly adjusted EBITDA A reconciliation of adjusted EBITDA to net loss for the three months ended March 31, 2023, March 31, 2022, and December 31, 2022, is set forth below: (in thousands) Net loss Income tax expense Interest income Interest expense Depreciation & amortization EBITDA Increase (decrease) in fair value of warrants Realized loss on disposal of assets Litigation settlement, net Three Months Ended March 31, 2023 March 31, 2022 (20,825) S (555) 920 229 (20,231) 112 514 85 110 1,219 22 232 122 1,720 (16,095) $ (26,834) $ 1,492 294 (25,048) 451 70 (3) December 31, 2022 Prepaid launch deposit impairment SEC and CFIUS legal expenses Class action litigation legal expenses Other non-recurring litigation legal expense SEC compliance costs NSA compliance costs Severance and other non-recurring expenses Stock-based compensation 2,212 3,044 Adjusted EBITDA (17,151) $ (15,550) 1 - Loss contingencies for certain severance agreements were reversed when the Company determined they would not be signed and paid 795 795 114 2,135 978 350 (24,440) (489) 1,096 259 (23,574) (1,803) 54 4,500 161 755 1,004 76 233 20

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