Material Agreement (Form 8-K)

Item 1.01

Entry into a Material Definitive Agreement

On September 19, 2025, Momentus Inc. (the "Company"), entered into a Sales Agreement (the "Sales Agreement") with A.G.P./Alliance Global Partners (the "Agent"), pursuant to which the Company may sell, from time to time, at its option, up to $7,350,000 in aggregate principal amount of an indeterminate amount of shares (the "Shares") of the Company's Class A common stock, par value $0.00001 per share, through the Agent, as the Company's sales agent. If the Company's public float increases such that it may sell additional amounts under the Sales Agreement and the Registration Statement (as defined below), the Company may file supplements to the prospectus included in the Registration Statement prior to making additional sales.

Any Shares to be offered and sold under the Sales Agreement will be issued and sold (i) by methods deemed to be an "at-the-market offering" as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended, or in negotiated transactions, if authorized by the Company, and (ii) pursuant to, and only upon the effectiveness of, a Registration Statement on Form S-3 filed by the Company with the Securities and Exchange Commission on September 22, 2025 for an offering of up to $50,000,000 of various securities, including shares of the Company's common stock, preferred stock, debt securities, warrants and/or units for sale to the public in one or more public offerings (the "Registration Statement").

Subject to the terms of the Sales Agreement, the Agent will use commercially reasonable efforts to sell the Shares from time to time, based upon the Company's instructions (including any price, time, or size limits or other customary parameters or conditions the Company may impose). The Company cannot provide any assurances that it will issue any Shares pursuant to the Sales Agreement. The Company will pay the Agent a commission of 3.0% of the gross sales price of the Shares sold pursuant to the Sales Agreement, if any. The Company has also agreed to provide the Agent with customary indemnification rights.

The offering of the Shares will terminate upon the earliest of (a) the issuance and sale of all of the Shares by the Agent on the terms and subject to the conditions set forth in the Sales Agreement and (b) the termination of the Sales Agreement by either of the parties thereto.

This Current Report on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy the Shares nor shall there be any sale of the Shares in any state in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

The foregoing description of the Sales Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Sales Agreement, which is attached hereto as Exhibit 1.1 and is incorporated by reference herein.