Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Momentus Inc., a Delaware corporation (the “Company”), on Form 10-K for the year ended December 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Form 10-K”), I, John Rood, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(i)the Form 10-K fully complies with the requirements of section 13(a) or section 15(d) of the Securities Exchange Act of 1934, as amended; and

(ii)the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company.

		By:	/s/John C. Rood
		Name:	John C. Rood
Dated:	June 5, 2024	Title:	Chief Executive Officer

This certification shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.