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Table of Contents ( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30 , 2026 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-39128 Momentus Inc. ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 1762 Automation Parkway San Jose , California ( Address of Principal Executive Offices ) 84-1905538 ( I.R.S. Employer Identification No. ) 95131 ( Zip Code ) ( 650 ) 564-7820 Registrant's telephone number , including area code Securities registered pursuant to section 12 ( b ) of the Act : Title of each class Class A common stock Warrants Trading Symbol ( s ) MNTS MNTSW Name of each exchange on which registered Nasdaq Stock Market LLC Nasdaq Stock Market LLC Indicate by check mark whether the registrant : ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) ; and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes x No o Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit and post such files ) . Yes x No o Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of “ large accelerated filer , ” “ accelerated filer ” “ smaller reporting company " and " emerging growth company ” in Rule 12b - 2 of the Exchange Act : Large accelerated filer Non - accelerated filer O X 1 Accelerated filer Smaller reporting company Emerging growth company X