# 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. Published 2026-11-08 by TGOs. Canonical: https://tgos.io/news/2026/11/08/ondas-agrees-to-buy-stemme-to-expand-ultra-aircraft/ 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.[1] The all-cash transaction would give Ondas full ownership of the supplier as it pursues its production target.[1] 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.[1] Those German sites span approximately 135,571 square feet of design, production and maintenance space.[1] 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.[1] It disclosed no purchase price in the announcement.[1] ## Why it matters Ondas expects ownership of Stemme to reduce reliance on an external supplier and enable closer coordination between engineering and production.[1] 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