Masanao was the son of Hoshino Masatoshi and held Takatô castle in Shinano province. He first served Takeda Shingen, then Takeda Katsuyori. Following the defeat of the Takeda in 1582, Masanao briefly served Hôjô Ujinao but later switched his loyalties to Toyotomi Hideyoshi and received the castle of Tako in Shimôsa province. After 1600, he went back to Takato (now held by his son Hoshino Masamitsu) and died there in 1601.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005