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, or Space One (スペースワン), is a Japanese aerospace manufacturer, orbital launch service provider, and spaceport operator. It is a private spaceflight company developing and operating the KAIROS orbital launch vehicle for small satellite launches; KAIROS flew its unsuccessful maiden flight in March 2024. The company was founded by investments from (a listed subsidiary of Canon), IHI Aerospace (a subsidiary of IHI Corporation), Shimizu Corporation and the Development Bank of Japan in July 2018.