Scheduled to carry two advanced NASA-hosted payloads in orbit

Momentus Inc. (NASDAQ:MNTS) ("Momentus" or the "Company"), a U.S. commercial space company specializing in satellite technology, space transportation, and in‑orbit services, today announced the successful completion of the Spacecraft Critical Design Review (CDR) for its Vigoride 8 mission, transporting two hosted payloads under contracts with NASA. Successful completion of this key program milestone formally concludes the design and analysis phase of the preparation of the spacecraft.

"Achieving Spacecraft CDR is a major accomplishment for the Vigoride 8 team," said Tom Malko, Senior Vice President of Engineering and Operations at Momentus. "We leveraged our historical space mission experience to deliver a rigorous design for an efficient review process. Today’s positive report confirms that our spacecraft configuration is fully defined, meets the needs of our NASA customers, and is ready to move into procurement and production activities. Overall, this milestone reflects the strength of our engineering organization in close collaboration with NASA and our mission partners."

Momentus has been successfully executing two contracts from NASA to carry two cutting-edge hosted payloads in orbit: the Spaceworks COSMIC payload and the Juno Rotating Detonation Rocket Engine (RDRE) payload.

NASA and mission customers from Spaceworks, COSMIC, and Juno attended the Vigoride 8 review onsite at Momentus’ San Jose headquarters where all subsystems and systems were examined in a detailed nine-hour review. At the conclusion of the review, the Vigoride 8 design received a "green" overall status to proceed, which signifies design maturity and program discipline underscoring Momentus’ space heritage, and reliance on this unique insight and expertise to enable precise design and comprehensive mission plans at a competitive pace.

The Company’s upcoming fully booked Vigoride 8 mission is scheduled to fly in 2027 with these NASA-hosted payloads. Momentus has also begun work on its subsequent Vigoride 9 spacecraft and mission planning. Momentus still has capacity available on the Vigoride 9 mission, and organizations interested in securing a payload slot can contact the Momentus Commercial team at sales@momentusspace.com.

About Momentus

Momentus is a U.S. commercial space company offering satellites, satellite components, and in‑space transportation and infrastructure services. Through its Vigoride orbital service vehicle, the Company delivers hosted payload support, last‑mile delivery, and servicing capabilities tailored to scalable mission architectures.

Forward-Looking Statements

This press release contains certain statements which may constitute "forward-looking statements" for purposes of the federal securities laws. Forward-looking statements include, but are not limited to, statements regarding the expected filing of the Company’s Form 10-K and Form 10-Q and its management team’s expectations, hopes, beliefs, intentions or strategies regarding the future, projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, and are not guarantees of future performance. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict and many of which are outside of Momentus’ control. Many factors could cause actual future events to differ materially from the forward-looking statements in this press release, including but not limited to risks and uncertainties included under the heading "Risk Factors" in the Annual Report on Form 10-K filed by the Company on March 31, 2026, as such factors may be updated from time to time in our other filings with the Commission, accessible on the Commission’s website at www.sec.gov and the Investor Relations section of our website at investors.momentus.space. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

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