M&A
Ondas agrees to buy Stemme to expand ULTRA aircraft production
Ondas targets 10 aircraft a month by 2028, combining greater use of Stemme’s German facilities with planned U.S. airframe production.
Ondas announced Nov. 5 that it has signed a definitive agreement to acquire Stemme GmbH, the German airframe manufacturer for its ULTRA long-endurance intelligence, surveillance and reconnaissance (ISR) aircraft. The all-cash transaction would give Ondas full ownership of the supplier as it pursues its production target.1
Ondas entered a definitive agreement to acquire 100% of Stemme GmbH
ULTRA's airframe manufacturer, in an all-cash transaction
across its Strausberg and Pasewalk, Germany facilities, about 135,571 square feet of design, production and maintenance space
Ondas plans to increase utilization of the German facilities and establish U.S. airframe production capacity
targeting 10 aircraft per month by 2028
The transaction is expected to close in the first quarter of 2027, subject to customary closing conditions and regulatory approvals
Source: Ondas release, November 5, 2026
Sources
In the Nov. 5 release, Ondas Chairman and CEO Eric Brock said acquiring Stemme would give the company “greater control over airframe capacity, cost and schedule.”1
Stemme operates at approximately 25% of production capacity across its Strausberg and Pasewalk facilities, according to Ondas. Those German sites span approximately 135,571 square feet of design, production and maintenance space. Ondas plans to increase their utilization while establishing U.S. airframe production with 345,000 square feet of planned production space.1
Ondas says ULTRA is operationally deployed by the U.S. Air Force and is capable of more than 70 hours of flight time with over 400 pounds of payload capacity.1
The company expects the acquisition to close in the first quarter of 2027, subject to customary closing conditions and regulatory approvals. It disclosed no purchase price in the announcement.1
Ondas expects ownership of Stemme to reduce reliance on an external supplier and enable closer coordination between engineering and production. Ondas Sentinel President and CEO Ryan Hartman said bringing the airframe, engineering and production line together would allow the company to iterate ULTRA’s design for future U.S. Air Force requirements.1
Sources (1)
- Ondas release, Nov. 5, 2026 www.ondas.com