September 25, 2025

John Rood
Chief Executive Officer
Momentus Inc.
3901 N. First Street
San Jose, California 95134

       Re: Momentus Inc.
           Registration Statement on Form S-3
           Filed on September 22, 2025
           File No. 333-290425
Dear John Rood:

       This is to advise you that we have not reviewed and will not review your
registration
statement.

        Please refer to Rules 460 and 461 regarding requests for acceleration.
We remind you
that the company and its management are responsible for the accuracy and
adequacy of their
disclosures, notwithstanding any review, comments, action or absence of action
by the staff.

       Please contact Bradley Ecker at 202-551-4985 with any questions.



                                                           Sincerely,

                                                           Division of
Corporation Finance
                                                           Office of
Manufacturing