Antonov is a Ukrainian aircraft manufacturing and services company that specializes in building very large airplanes and airplanes designed to operate on unprepared runways. The company was founded in 1946 as the top-secret Soviet Research and Design Bureau No. 153 (OKB-153) and was headed by Oleg Antonov. Antonov has built approximately 22,000 aircraft, including the An-2 biplane, which is still in operation today. The company is currently owned by Ukroboronprom and has its headquarters in Kyiv, Ukraine.