French launch startup Sirius Space Services has acquired the high-precision metal-component manufacturer AMM-42. The acquisition is part of the company’s vertical integration efforts to bring key manufacturing capabilities in-house.
Sirius Space Services is developing a range of three rockets that all use a modular booster system. Sirius 1 will be a two-stage, single-stick rocket capable of delivering 175 kilograms to low Earth orbit. Sirius 13 will feature two strap-on boosters, while Sirius 15 will use four, with payload capacities of 600 and 1,000 kilograms, respectively. The company is currently preparing for a suborbital flight of its Sirius 1B demonstrator in early 2027.
In a 16 March press release, Sirius Space Services announced that it had acquired AMM-42, which employs 35 people and was previously owned by ACI Group. The acquisition follows the September 2025 collapse of ACI Group and its subsidiaries, which were placed under court supervision by the Lyon Economic Activities Court.
“Space is an extremely demanding industry. Beyond funding, what truly makes the difference is industrial strategy, technological mastery, and production capabilities,” said Antoine Fourcade, President of Sirius Space. “The integration of AMM-42 is fully aligned with this approach.”
This is the company’s second such purchase in less than a year, following its acquisition of SERM in June 2025. The company, which now goes by SERM by Sirius, specialises in advanced metal manufacturing and is bolstering its parent company’s additive manufacturing capacity, particularly for combustion chambers and turbopumps.
According to the company, it is currently working towards full-scale tests of its Star-1 rocket engine, expected in the first half of 2026. This will pave the way for the Sirius 1B demonstrator flight, which is expected in the first half of 2027. This suborbital flight is expected to “validate the launcher’s key technological building blocks and performance under real conditions.”
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