Nature of Operations	12 Months Ended
Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Note 1. Nature of Operations The Company Momentus Inc. (together with its consolidated subsidiaries “Momentus” or the “Company”) is a U.S. commercial space company that offers satellites, satellite buses, satellite technologies and components, and space infrastructure services, including in-space transportation, hosted payloads and in-orbit services. Momentus has launched four missions to date, deployed 17 customer satellites, and provided hosted payload services. Three of these missions involved operation of the Vigoride Orbital Service Vehicle (“OSV”) in orbit. During these three Vigoride missions, the system and technology were tested repeatedly. Improvements based on lessons learned during these missions were rapidly incorporated. As a result of these three missions, the Vigoride OSV has been successfully demonstrated in space and accumulated significant flight heritage. The Company has produced its next OSV, Vigoride 7, that it intends to utilize on a 2026 mission. In addition to the Vigoride OSV, Momentus is now also offering its M-1000 satellite bus which has substantial commonality with Vigoride. With a growing demand for satellite bus services, Momentus is positioned to advance its hardware and flight-proven technology for this market. The M-1000 bus is a flexible option to meet various mission requirements. Innovations to improve sensor capability, maneuverability, increased power, and lower costs are integrated into the product. Momentus believes it can manufacture satellite buses like the M-1000 at a rapid and scalable pace. Business Combination On August 12, 2021, the Company consummated a merger pursuant to the terms of the Agreement and Plan of Merger, dated October 7, 2020, and as amended on March 5, 2021, April 6, 2021, and June 29, 2021 (the “Merger Agreement”), by and among Stable Road Acquisition Corp (“SRAC”), Project Marvel First Merger Sub, Inc., a Delaware corporation and a direct, wholly-owned subsidiary of SRAC (“First Merger Sub”), and Project Marvel Second Merger Sub, LLC, a Delaware limited liability company and a direct, wholly-owned subsidiary of SRAC (“Second Merger Sub”), pursuant to which First Merger Sub merged with and into Momentus Inc., a Delaware corporation (“Legacy Momentus”) with Legacy Momentus as the surviving corporation of the First Merger Sub, and immediately following which Legacy Momentus merged with and into the Second Merger Sub, with the Second Merger Sub as the surviving entity (the “Business Combination”). In connection with the closing of the Business Combination (“Closing”), the Company changed its name from Stable Road Acquisition Corp. to Momentus Inc., and Legacy Momentus changed its name to Momentus Space, LLC. The Business Combination was accounted for as a reverse recapitalization under ASC Topic 805, Business Combinations, with SRAC and its two wholly-owned subsidiaries. The Company received gross proceeds of $247.3 million upon the Closing. Public and private warrants of SRAC were assumed by the Company as a result of the Business Combination. Going Concern The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern. The going concern basis of presentation assumes that the Company will continue in operation one year after the date these consolidated financial statements are issued and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business. Pursuant to ASC Sub-Topic 205-40, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, in connection with the preparation of the consolidated financial statements for the year ended December 31, 2025, management concluded that, without taking into consideration the potential mitigating effect of management’s plans that have not been fully implemented or are not within control of the Company, there are conditions or events, considered in the aggregate, that raise substantial doubt about the Company’s ability to fund its regular operations, scaling of commercial production, and maintain its existing services and products as a going concern for one year from the date these consolidated financial statements are issued. Management’s plans in the event the Company is unable to raise additional financing include (i) collection of amounts as they come due under customer contracts, (ii) monetization of unutilized capacity under the MSA agreement with Velo3D; (iii) reduction of employee headcount and compensation expenses; and (iv) reduction of outside vendor expenses. Management then evaluated its plans to reduce expenses under the framework provided in ASC Sub-Topic 205-40, and determined that the mitigating effect of its plans sufficiently alleviates the substantial doubt about the Company’s ability to continue as a going concern. Under ASC Sub-Topic 205-40, the mitigating effect of management’s plans is only considered if both (1) it is probable that the plans will be effectively implemented within one year after the date that the consolidated financial statements are issued, and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the consolidated financial statements are issued. While the Company believes these actions provide sufficient liquidity for its current operating plans, additional capital may be required in the future to support growth initiatives and achieve profitability, and there can be no assurance that such capital will be available on acceptable terms or at all. The Company’s ability to continue as a going concern is dependent on the Company’s ability to successfully raise capital to fund its business operations and execute on its business plan. To date the Company remains heavily focused on growth and continued development of its proprietary technology, and as a result, it has not generated sufficient revenues to provide cash flows that enable the Company to finance its operations internally. This is reflected by the Company’s incurred net loss of $30.5 million for the year ended December 31, 2025, and accumulated deficit of $438.6 million as of December 31, 2025. Additionally, the Company used net cash of $23.3 million to fund its operating activities for the year ended December 31, 2025, and had cash and cash equivalents of $12.8 million as of December 31, 2025. The accompanying consolidated financial statements have been prepared on a going concern basis of accounting. The accompanying consolidated financial statements do not reflect any adjustments that might result if the Company is unable to continue as a going concern. Reverse Stock Splits Effective December 17, 2025, the Company’s stockholders approved a 1-for-17.85 reverse stock split of the Company’s Class A common stock. As a result of the reverse stock split, every 17.85 shares of Class A common stock issued and outstanding on December 17, 2025, were automatically combined into one share of Class A common stock. Any fractional shares resulting from the reverse stock split were rounded up to the next nearest whole share of Class A common stock. The reverse stock split did not affect the stated par value of the Class A common stock nor did it change the total number of the Company’s authorized shares of Class A common stock. Both the Company’s Class B common stock and Series A preferred stock were not affected by the reverse stock split. In addition to the reverse stock split implemented in December 2025, the Company previously effected a 1-for-14 reverse stock split of the Company’s Class A common stock on December 12, 2024, whereby every 14 shares of Class A common stock issued and outstanding on December 12, 2024, were automatically combined into one share of Class A common stock. Any fractional shares resulting from the reverse stock split were rounded up to the next nearest whole share of Class A common stock. The reverse stock split did not affect the stated par value of the Class A common stock nor did it change the total number of the Company’s authorized shares of Class A common stock. The Company’s Class B common stock were not affected by the reverse stock split. Also on the effective date of each reverse stock split, all options, warrants, and other convertible securities of the Company outstanding immediately prior to the reverse stock split were adjusted by dividing the number of shares of Class A common stock into which the options, warrants, and other convertible securities are exercisable or convertible by the factor applied in the reverse stock split, and multiplying the exercise or conversion price thereof by the same amount, all in accordance with the terms of the plans, agreements, or arrangements governing such options, warrants, and other convertible securities and subject to rounding to the nearest whole share. Such proportional adjustments were also made to the number of shares and restricted stock units (“RSUs”) issued and issuable under the Company’s equity compensation plans. The Company has retroactively adjusted all periods presented for the effects of the December 2025 1-for-17.85 reverse stock split. See Note 9 for additional information.

Momentus has launched four missions to date, deployed 17 customer satellites, and provided hosted payload services. Three of these missions involved operation of the Vigoride Orbital Service Vehicle (“OSV”) in orbit. During these three Vigoride missions, the system and technology were tested repeatedly. Improvements based on lessons learned during these missions were rapidly incorporated. As a result of these three missions, the Vigoride OSV has been successfully demonstrated in space and accumulated significant flight heritage. The Company has produced its next OSV, Vigoride 7, that it intends to utilize on a 2026 mission.

In addition to the Vigoride OSV, Momentus is now also offering its M-1000 satellite bus which has substantial commonality with Vigoride. With a growing demand for satellite bus services, Momentus is positioned to advance its hardware and flight-proven technology for this market. The M-1000 bus is a flexible option to meet various mission requirements. Innovations to improve sensor capability, maneuverability, increased power, and lower costs are integrated into the product. Momentus believes it can manufacture satellite buses like the M-1000 at a rapid and scalable pace.

On August 12, 2021, the Company consummated a merger pursuant to the terms of the Agreement and Plan of Merger, dated October 7, 2020, and as amended on March 5, 2021, April 6, 2021, and June 29, 2021 (the “Merger Agreement”), by and among Stable Road Acquisition Corp (“SRAC”), Project Marvel First Merger Sub, Inc., a Delaware corporation and a direct, wholly-owned subsidiary of SRAC (“First Merger Sub”), and Project Marvel Second Merger Sub, LLC, a Delaware limited liability company and a direct, wholly-owned subsidiary of SRAC (“Second Merger Sub”), pursuant to which First Merger Sub merged with and into Momentus Inc., a Delaware corporation (“Legacy Momentus”) with Legacy Momentus as the surviving corporation of the First Merger Sub, and immediately following which Legacy Momentus merged with and into the Second Merger Sub, with the Second Merger Sub as the surviving entity (the “Business Combination”). In connection with the closing of the Business Combination (“Closing”), the Company changed its name from Stable Road Acquisition Corp. to Momentus Inc., and Legacy Momentus changed its name to Momentus Space, LLC.

The Business Combination was accounted for as a reverse recapitalization under ASC Topic 805, Business Combinations, with SRAC and its two wholly-owned subsidiaries. The Company received gross proceeds of $247.3 million upon the Closing. Public and private warrants of SRAC were assumed by the Company as a result of the Business Combination.

The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern. The going concern basis of presentation assumes that the Company will continue in operation one year after the date these consolidated financial statements are issued and will be able to realize its assets and discharge its liabilities and commitments in the normal course of business.

Pursuant to ASC Sub-Topic 205-40, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, in connection with the preparation of the consolidated financial statements for the year ended December 31, 2025, management concluded that, without taking into consideration the potential mitigating effect of management’s plans that have not been fully implemented or are not within control of the Company, there are conditions or events, considered in the aggregate, that raise substantial doubt about the Company’s ability to fund its regular operations, scaling of commercial production, and maintain its existing services and products as a going concern for one year from the date these consolidated financial statements are issued. Management’s plans in the event the Company is unable to raise additional financing include (i) collection of amounts as they come due under customer contracts, (ii) monetization of unutilized capacity under the MSA agreement with Velo3D; (iii) reduction

of employee headcount and compensation expenses; and (iv) reduction of outside vendor expenses. Management then evaluated its plans to reduce expenses under the framework provided in ASC Sub-Topic 205-40, and determined that the mitigating effect of its plans sufficiently alleviates the substantial doubt about the Company’s ability to continue as a going concern.

Under ASC Sub-Topic 205-40, the mitigating effect of management’s plans is only considered if both (1) it is probable that the plans will be effectively implemented within one year after the date that the consolidated financial statements are issued, and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the consolidated financial statements are issued. While the Company believes these actions provide sufficient liquidity for its current operating plans, additional capital may be required in the future to support growth initiatives and achieve profitability, and there can be no assurance that such capital will be available on acceptable terms or at all. The Company’s ability to continue as a going concern is dependent on the Company’s ability to successfully raise capital to fund its business operations and execute on its business plan. To date the Company remains heavily focused on growth and continued development of its proprietary technology, and as a result, it has not generated sufficient revenues to provide cash flows that enable the Company to finance its operations internally. This is reflected by the Company’s incurred net loss of $30.5 million for the year ended December 31, 2025, and accumulated deficit of $438.6 million as of December 31, 2025. Additionally, the Company used net cash of $23.3 million to fund its operating activities for the year ended December 31, 2025, and had cash and cash equivalents of $12.8 million as of December 31, 2025.

Effective December 17, 2025, the Company’s stockholders approved a 1-for-17.85 reverse stock split of the Company’s Class A common stock. As a result of the reverse stock split, every 17.85 shares of Class A common stock issued and outstanding on December 17, 2025, were automatically combined into one share of Class A common stock. Any fractional shares resulting from the reverse stock split were rounded up to the next nearest whole share of Class A common stock. The reverse stock split did not affect the stated par value of the Class A common stock nor did it change the total number of the Company’s authorized shares of Class A common stock. Both the Company’s Class B common stock and Series A preferred stock were not affected by the reverse stock split.

In addition to the reverse stock split implemented in December 2025, the Company previously effected a 1-for-14 reverse stock split of the Company’s Class A common stock on December 12, 2024, whereby every 14 shares of Class A common stock issued and outstanding on December 12, 2024, were automatically combined into one share of Class A common stock. Any fractional shares resulting from the reverse stock split were rounded up to the next nearest whole share of Class A common stock. The reverse stock split did not affect the stated par value of the Class A common stock nor did it change the total number of the Company’s authorized shares of Class A common stock. The Company’s Class B common stock were not affected by the reverse stock split.

Also on the effective date of each reverse stock split, all options, warrants, and other convertible securities of the Company outstanding immediately prior to the reverse stock split were adjusted by dividing the number of shares of Class A common stock into which the options, warrants, and other convertible securities are exercisable or convertible by the factor applied in the reverse stock split, and multiplying the exercise or conversion price thereof by the same amount, all in accordance with the terms of the plans, agreements, or arrangements governing such options, warrants, and other convertible securities and subject to rounding to the nearest whole share. Such proportional adjustments were also made to the number of shares and restricted stock units (“RSUs”) issued and issuable under the Company’s equity compensation plans.