Ondas to Acquire Stemme, Expand ULTRA Output
The all-cash deal gives Ondas control of the German firm that builds the airframe used by its ULTRA aircraft.
Updated on Nov. 6, 2026 in Manufacturing
Ondas Inc. signed a definitive agreement on November 5, 2026, to acquire 100% of Stemme GmbH in an all-cash transaction. Ondas did not disclose the purchase price or financing details.
Why it matters
Stemme manufactures the airframe used by ULTRA, so control of the firm bears directly on Ondas's ability to scale production of the aircraft. The company has set a target of 10 ULTRA aircraft per month by 2028, a pace it had earlier projected for 2027 at two per month.
Stemme's German facilities in Strausberg and Pasewalk span about 135,571 square feet and run at roughly 25% of production capacity, while Ondas plans 345,000 square feet of U.S. airframe space. Ondas has not disclosed the purchase price or how many aircraft its $18.8 million July order covers.
The players
Ondas Inc.
Ondas Inc. is a company developing the ULTRA aircraft and pursuing expanded airframe production in the United States.
Stemme GmbH
Stemme GmbH is a German aircraft manufacturer whose airframe is used by the ULTRA aircraft and which operates facilities in Strausberg and Pasewalk.
The details
Ondas will acquire Stemme through an all-cash transaction that is expected to close in the first quarter of 2027. Stemme's airframe is the structural base of the ULTRA aircraft, which has a stated 70-hour airborne endurance and 400-pound payload capacity.
Timeline
July 2026: Ondas secured an $18.8 million ULTRA order from an unnamed customer.
November 5, 2026: Ondas signed the definitive agreement to acquire Stemme.
First quarter of 2027: Expected closing of the Stemme acquisition.
2028: Target date for 10 ULTRA aircraft per month.
Market Landscape
The move brings the ULTRA airframe supply chain in-house as Ondas pushes its production ramp, with Stemme's German capacity running at about 25% and a U.S. airframe plant still unsited. Control of the airframe supplier positions Ondas to scale ULTRA output faster than a purchase-only arrangement would allow.
For buyers and operators, the deal signals whether ULTRA production will reach the announced 10 aircraft per month by 2028, a timeline that depends on the German plants and a U.S. facility not yet located. Pricing, delivery windows, and order sizes remain undisclosed, so customers cannot yet judge when new units will be available.
The takeaway
Ondas's plan ties its aircraft output directly to ownership of its airframe supplier, so the 2028 production target will be the clearest test of whether that integration works. Watch for the closing in early 2027 and any announced U.S. facility site.
What happens next
Ondas expects the Stemme acquisition to close in the first quarter of 2027, at which point control of the airframe maker will transfer.
Further reading
For broader context on how aerospace producers are scaling airframe output, see Manufacturing.
Source note: This article includes information reported by TokenPost.
