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December 6, 2023

Date of Report (date of earliest event reported)

Registrant's telephone number, including area code

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to section 12(g) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 4.01 Changes in Registrant’s Certifying Accountant.

On December 2, 2023, Momentus Inc. (the “Company”) engaged the firm Frank, Rimerman + Co. LLP (“Frank, Rimerman”) as its new independent registered public accounting firm.

During the fiscal years ended December 31, 2021 and 2022, and the subsequent interim period through September 30, 2023, the Company has not consulted with Frank, Rimerman regarding either: (i) the application of accounting principles to any specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s financial statements; or (ii) any matter that was either the subject of a disagreement (as defined in Regulation S-K, Item 304(a)(1)(iv) and the related instructions) or reportable event (as defined in Regulation S-K, Item 304(a)(1)(v)).

As previously disclosed, on July 19, 2023, the Company was informed by Armanino LLP (“Armanino”), the Company’s then current independent registered public accounting firm, that Armanino would resign as the Company’s independent auditor (not related to any actions taken by the Company). Armanino advised the Company that its decision to resign was due solely to Armanino’s decision to exit from the practice of providing financial statement audit services to all its public company engagements.