MNTS Momentus Inc. - 8-K

Item 1.01

Entry into a Material Definitive Agreement.

On May 26, 2026, Momentus Inc., a Delaware corporation (“Momentus” or the “Company”), entered into a Securities Purchase Agreement (the “Securities
Purchase Agreement”) with institutional investors (the “Investors”) for a private placement of (i) 2,173,420 shares of the Company’s Class A common stock, par value $0.00001 per share (the “Common Stock”), for $8.50 per share and (ii) pre-funded
warrants to purchase up to 768,580 shares of Common Stock (the “Pre-Funded Warrants” and, together with the Common Stock, the “Securities”).

The private placement closed on May 28, 2026. The Company received aggregate gross proceeds from the private placement of approximately $25 million,
before deducting estimated placement agent commissions and expenses, which are payable by the Company.

The Securities Purchase Agreement contains customary representations, warranties and agreements by the Company, customary conditions to closing,
indemnification obligations of the Company and the Investors, other obligations of the parties and termination provisions. The representations, warranties and covenants in the Securities Purchase Agreement were made only for purposes of such
agreement and as of specific dates, were solely for the benefit of the parties to such agreement, and may be subject to limitations agreed upon by the contracting parties.

The Company agreed to use the net proceeds from the private placement for general
corporate purposes,   which may include repayment of principal on the Company’s indebtedness, capital expenditures, and funding its working
capital needs, but not in violation of the Foreign Corrupt Practices Act of 1977, as amended, or the regulations promulgated by the Office of Foreign Assets Control of the U.S. Treasury Department. The Securities Purchase Agreement is governed
by the laws of the State of New York.

The Company also agreed that, from the date of the Securities Purchase Agreement until 5 days after the date that the resale registration statement
required by the Registration Rights Agreement (as defined below) becomes effective (the “Effective Date”), subject to certain limited exceptions set forth in the Securities Purchase Agreement, the Company will not (i) issue, enter into any
agreement to issue or announce the issuance or proposed issuance of any shares of Common Stock or Common Stock Equivalents (as defined in the Securities Purchase Agreement), or (ii) file any registration statement or any amendment or supplement
thereto other than as contemplated pursuant to the Registration Rights Agreement. Further, until 30 days after the Effective Date, the Company is prohibited from effecting or entering into an agreement to effect any issuance by the Company or any
of its subsidiaries of Common Stock or Common Stock Equivalents (or a combination of units thereof) involving a Variable Rate Transaction (as defined in the Securities Purchase Agreement), subject to certain limited exceptions set forth in the
Securities Purchase Agreement; provided, however, that sales of shares of Common Stock at a price no less than $20.00 per share in an “at the market” offering with A.G.P./Alliance Global Partners (the “Placement Agent”) acting as the sales agent
may be made, and after 5 days following the Effective Date, such sales may be made at a price below $20.00 per share.

The purchase price of each Pre-Funded Warrant equals $8.50 per share minus the $0.00001 exercise price per share of the Pre-Funded Warrant. The
Pre-Funded Warrants are exercisable at any time after their original issuance, and will not expire until exercised in full.

The Pre-Funded Warrants provide that the Investor will not have the right to exercise any portion thereof if such exercise would cause the aggregate
number of shares of Common Stock beneficially owned by the Investor (together with its affiliates) to exceed 9.99% of the number of shares of Common Stock outstanding immediately after giving effect to the exercise, as such percentage ownership is
determined in accordance with the terms of the Pre‑Funded Warrants.

In connection with the private placement, the Company entered into a Registration Rights Agreement with the Investor (the “Registration Rights
Agreement”) requiring the Company to file a registration statement covering the resale of all of the Registrable Securities (as defined in the Registration Rights Agreement) with the Securities and Exchange Commission (the “SEC”) no later than the
10th trading day following the date of the Registration Rights Agreement, and have the registration statement declared effective by the SEC as promptly as practicable after the filing thereof, but in any event no later than 15th calendar day
following the date of the Registration Rights Agreement, or in the event of a “limited review” by the SEC, the 30th day following the date of the Registration Rights Agreement, or in the event of a “full review” by the SEC, the 45th day following
the date of the Registration Rights Agreement.

Upon the occurrence of any Event (as defined in the Registration Rights Agreement), which, among others, prohibits the Investor from reselling the
Securities for more than 10 consecutive calendar days or more than an aggregate of 15 calendar days during any 12-month period, the Company is obligated to pay to the Investor, on each monthly anniversary of each such Event, an amount in cash, as
partial liquidated damages and not as a penalty, equal to the product of 1.5% multiplied by the aggregate subscription amount paid by such Investor pursuant to the Securities Purchase Agreement.

The Company may not file any other registration statements until all Registrable Securities (as defined in the Registration Rights Agreement) are
registered pursuant to a registration statement that is declared effective by the SEC, provided that the Company may file amendments to registration statements filed prior to the date of the Registration Rights Agreement so long as no new
securities are registered on any such existing registration statements. All fees and expenses incident to the performance of or compliance with the Registration Rights Agreement by the Company will be borne by the Company, whether or not any
Registrable Securities (as defined in the Registration Rights Agreement) are sold pursuant to a registration statement.

In connection with the private placement, on May 26, 2026, the Company entered into a Placement Agency Agreement with the Placement Agent. As part of
its compensation for acting as Placement Agent for the private placement, the Company paid the Placement Agent a cash fee of 7.0% of the aggregate gross proceeds and issued to the Placement Agent warrants to purchase 147,100 shares of Common Stock
(the “Placement Agent Warrants”) at an exercise price of $9.35 per share, which are exercisable 180 days from the date of commencement of sales of the private placement offering.

The above summary of the private placement, the Pre-Funded Warrants, the Placement Agent Warrants, the Securities Purchase Agreement and the
Registration Rights Agreement does not purport to be complete and is qualified in its entirety by reference to such applicable agreements, copies of which are attached as Exhibits 4.1, 4.2, 10.1 and 10.2 to this Current Report on Form 8-K and
incorporated herein by reference.

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

Item 3.02

Unregistered Sales of Equity Securities.

The information contained above in Item 1.01 of this Current Report on Form 8-K related to the Securities is hereby incorporated by reference into this
Item 3.02. The Securities and the Placement Agent Warrants were sold without registration under the Securities Act of 1933, as amended (the “Securities Act”), in reliance on the exemptions provided by Section 4(a)(2) of the Securities Act as a
transaction not involving a public offering and Rule 506(b) of Regulation D promulgated under the Securities Act as sales to accredited investors and in reliance on similar exemptions under applicable state laws.

Item 7.01

Regulation FD Disclosure.

On May 27, 2026, Momentus issued a press release announcing the pricing of the private placement. A copy of the press release is attached as Exhibit
99.1 to this Current Report on Form 8-K.

This information and the information contained in Exhibit 99.1 is furnished and shall not be deemed “filed” for purposes of Section 18 of the Exchange
Act, or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference in any filing under the Securities Act or the Securities Exchange Act of 1934, as amended, except as may be expressly set forth by
specific reference in any such filing, regardless of any general incorporation language in the filing.

The Company does not have, and expressly disclaims, any obligation to release publicly any updates or any changes in its expectations or any change in
events, conditions, or circumstances on which any forward-looking statement is based.

Item 9.01

Financial Statements and Exhibits.

(d)

Exhibits

Exhibit

Number

Exhibit Description

4.1

Form of Pre-Funded Warrant

4.2

Form of Placement Agent Warrant

10.1

Form of Securities Purchase Agreement

10.2

Form of Registration Rights Agreement

99.1

Press Release, dated May 27, 2026, issued by Momentus Inc. announcing the pricing of the private placement.

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)