Momentus to Host Portal Space Systems' Inaugural On-orbit Demonstration Mission

Momentus and Portal Space Systems join forces to propel next-generation flight computing demonstration on SpaceX Transporter Mission in Early 2026

Momentus Inc. (NASDAQ:MNTS) ("Momentus" or the "Company"), a leading U.S. commercial space firm specializing in satellite solutions, in-space transportation, and orbital infrastructure, has signed a contract with Portal Space Systems to provide hosted payload services for the company's first on-orbit demonstration of its advanced flight computer technology.

Momentus is committed to supporting the development and testing of next-generation space technology. Portal Space Systems emerged from stealth in April 2024, after its founding in 2021 by former SpaceX VP of Propulsion, Jeff Thornburg. This mission will validate the performance of Portal's flight computer, avionics and flight software in the harsh conditions of space, where exposure to radiation, extreme temperatures, and vacuum presents significant operational challenges.

Flight computing, power systems components and avionics systems are critical to satellite operations, enabling autonomous control for highly maneuverable spacecraft. The need for robust fail-safes and system redundancy is essential to ensuring mission success and operational reliability in these demanding environments.

"In-space validation is the cornerstone of de-risking space systems, especially when you're building a spacecraft like Supernova that has to think, act and react across transorbital domains," said Jeff Thornburg, CEO and Co-Founder of Portal Space Systems. "This mission lets us iterate and advance faster, and we're thrilled to be flying alongside some of the most ambitious payloads in space."

This payload will be among several mission-critical payloads Momentus will carry aboard its Vigoride 7 Orbital Service Vehicle, scheduled for launch no earlier than February 2026 on a SpaceX Transporter mission to Low Earth Orbit.

"We're thrilled to support Portal as they push the boundaries of innovation, advancing their technology in the extreme environment of space to enable groundbreaking capabilities," said Momentus CEO John Rood. "This payload from Portal joins several other innovative payloads from the U.S. Defense Department and commercial customers that are manifested to be carried in orbit on the Momentus Vigoride 7. We are looking forward to conducting this exciting mission that will demonstrate new capabilities for in-orbit assembly, rendezvous and close proximity sensing, and new computing and power generation capabilities."

About Momentus

Momentus is a U.S. commercial space company offering satellites, satellite components, and in-space transportation and infrastructure services. The Company offers satellites to support government and commercial customers for missions like communications, missile tracking, and cutting-edge science missions. Momentus offers services such as hosted payloads, support for in-space assembly, on-orbit servicing and refueling, and transportation of satellites to specific orbits.

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 April 9, 2025, 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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