Nature of Operations	6 Months Ended
Jun. 30, 2026
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, 3D printed tanks, and components, and services, as well as, space infrastructure services, including in-space transportation, hosted payloads and in-orbit services. Momentus has launched five missions to date, deployed 17 customer satellites, and provided hosted payload services. Four of these missions involved operation of the Vigoride Orbital Service Vehicle (“OSV”) in orbit, and the fifth mission involved use of a deployment system to carry and place customer satellites in orbit. During the four 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 four missions, the Vigoride OSV has been successfully demonstrated in space and accumulated significant flight heritage. The Company launched its latest OSV, Vigoride 7, on March 30, 2026 to low Earth orbit (“LEO”) with 10 payloads During this mission, which is expected to last several more months, the Company is scheduled to provide hosted payload services to a range of U.S. Government customers with payloads aboard, including the Defense Advanced Research Projects Agency (“DARPA”), SpaceWERX, which is the innovation organization of the U.S. Space Force, the U.S. Air Force Research Laboratory, the National Aeronautics and Space Administration (“NASA”), as well as commercial customers. The Vigoride 7 OSV has completed a series of orbit‑lowering maneuvers, reducing its altitude nearly 20 km through more than 50 controlled and precisely timed operations of both of its on-board Microwave Electrothermal Thrusters (METs) that utilize water as its propellant. The innovative Momentus MET has now cumulatively been used over 400 times to maneuver the Vigoride spacecraft on the Company’s current mission and on previous missions since 2023 demonstrating the maturity of this proprietary system. In addition to completing orbit‑lowering, Momentus and its mission partners continue to operate hosted payloads on the Vigoride 7 mission. Two such hosted payloads from Momentus are showing good results. •Vigoride’s momentum wheels, flown on the vehicle for the first time, are working smoothly and by design, maintaining the spacecraft’s steadiness, stability, and proper orientation. •Concurrently, flight testing of a titanium, additively manufactured fuel tank designed by Momentus is going well and holding pressure as expected. The flight test of this fuel tank (that is of the type that is in high demand as small satellites are produced in much greater numbers) is a key step in demonstrating the potential of additive manufacturing, otherwise knows as 3D printing, to accelerate innovation in spacecraft design, reduce production timelines, and enable complex geometries that improve performance of mission-critical spacecraft components. The Company plans to launch its Vigoride 8 mission in 2027 carrying two payloads for NASA under contracts it has been awarded. Momentus has also begun work on its Vigoride 9 spacecraft for a subsequent mission. In addition to the Vigoride OSV, Momentus is also offering this system as a satellite bus. With a growing demand for satellite bus services, Momentus is positioned to advance its hardware and flight-proven technology for this market. The Vigoride 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 is also offering a smaller version of the Vigoride bus called Vigoride Lite. Momentus believes it can manufacture satellite buses at a rapid and scalable pace. Capital Resources and Recent Financing Transactions During the six months ended June 30, 2026, the Company received net cash provided by financing activities of approximately $109.9 million primarily from sales of Class A common stock, including proceeds from sales under the ATM Sales Agreement, sales through private placements and a registered direct offering, and from the exercise of warrants. The Company sold Class A common stock under the ATM Sales Agreement for gross proceeds of $47.0 million, completed private placements of securities for gross proceeds of $35.0 million, a registered direct offering for gross proceeds of $25.0 million, and received gross proceeds of $9.6 million from the exercise of warrants. Net cash provided by financing activities reflects the gross proceeds from these financing transactions, net of equity issuance costs and other financing cash flows during the period. See Note 9 for additional details. These proceeds, combined with service revenue received during the six months ended June 30, 2026, have significantly improved the liquidity and financial position of the Company over December 31, 2025. 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. 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 Inc. (together with its consolidated subsidiaries “Momentus” or the “Company”) is a U.S. commercial space company that offers satellites, satellite buses, satellite technologies, 3D printed tanks, and components, and services, as well as, space infrastructure services, including in-space transportation, hosted payloads and in-orbit services.

Momentus has launched five missions to date, deployed 17 customer satellites, and provided hosted payload services. Four of these missions involved operation of the Vigoride Orbital Service Vehicle (“OSV”) in orbit, and the fifth mission involved use of a deployment system to carry and place customer satellites in orbit. During the four 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 four missions, the Vigoride OSV has been successfully demonstrated in space and accumulated significant flight heritage.

The Company launched its latest OSV, Vigoride 7, on March 30, 2026 to low Earth orbit (“LEO”) with 10 payloads During this mission, which is expected to last several more months, the Company is scheduled to provide hosted payload services to a range of U.S. Government customers with payloads aboard, including the Defense Advanced Research Projects Agency (“DARPA”), SpaceWERX, which is the innovation organization of the U.S. Space Force, the U.S. Air Force Research Laboratory, the National Aeronautics and Space Administration (“NASA”), as well as commercial customers.

The Vigoride 7 OSV has completed a series of orbit‑lowering maneuvers, reducing its altitude nearly 20 km through more than 50 controlled and precisely timed operations of both of its on-board Microwave Electrothermal Thrusters (METs) that utilize water as its propellant. The innovative Momentus MET has now cumulatively been used over 400 times to maneuver the Vigoride spacecraft on the Company’s current mission and on previous missions since 2023 demonstrating the maturity of this proprietary system.

In addition to completing orbit‑lowering, Momentus and its mission partners continue to operate hosted payloads on the Vigoride 7 mission. Two such hosted payloads from Momentus are showing good results.

•Vigoride’s momentum wheels, flown on the vehicle for the first time, are working smoothly and by design, maintaining the spacecraft’s steadiness, stability, and proper orientation.

•Concurrently, flight testing of a titanium, additively manufactured fuel tank designed by Momentus is going well and holding pressure as expected. The flight test of this fuel tank (that is of the type that is in high demand as small satellites are produced in much greater numbers) is a key step in demonstrating the potential of additive manufacturing, otherwise knows as 3D printing, to accelerate innovation in spacecraft design, reduce production timelines, and enable complex geometries that improve performance of mission-critical spacecraft components.

The Company plans to launch its Vigoride 8 mission in 2027 carrying two payloads for NASA under contracts it has been awarded. Momentus has also begun work on its Vigoride 9 spacecraft for a subsequent mission.

In addition to the Vigoride OSV, Momentus is also offering this system as a satellite bus. With a growing demand for satellite bus services, Momentus is positioned to advance its hardware and flight-proven technology for this market. The Vigoride 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 is also offering a smaller version of the Vigoride bus called Vigoride Lite. Momentus believes it can manufacture satellite buses at a rapid and scalable pace.

During the six months ended June 30, 2026, the Company received net cash provided by financing activities of approximately $109.9 million primarily from sales of Class A common stock, including proceeds from sales under the ATM Sales Agreement, sales through private placements and a registered direct offering, and from the exercise of warrants. The Company sold Class A common stock under the ATM Sales Agreement for gross proceeds of

$47.0 million, completed private placements of securities for gross proceeds of $35.0 million, a registered direct offering for gross proceeds of $25.0 million, and received gross proceeds of $9.6 million from the exercise of warrants. Net cash provided by financing activities reflects the gross proceeds from these financing transactions, net of equity issuance costs and other financing cash flows during the period. See Note 9 for additional details. These proceeds, combined with service revenue received during the six months ended June 30, 2026, have significantly improved the liquidity and financial position of the Company over 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.

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.