The Yoyodyne Division (also known as Yoyodyne Propulsion Systems or YPS) was a shipbuilding entity that built starships for the United Federation of Planets at various shipyards including 40 Eridani A Starfleet Construction Yards, Copernicus Ship Yards, and San Francisco Fleet Yards in the 24th century.
The Constellation-class starship USS Hathaway was built by Yoyodyne at Luna. (TNG: "Peak Performance")
The Miranda-class starship USS Brattain was built by Yoyodyne at 40 Eridani on stardate 22519.5. (TNG: "Night Terrors")
The Nebula-class starship USS Phoenix was built by Yoyodyne at 40 Eridani on stardate 40250.5. (TNG: "The Wounded")
The Nebula-class starship USS Sutherland was built by Yoyodyne in San Francisco on stardate 44820.5. (TNG: "Redemption II")
The firm had an office on Deep Space 9's Promenade. (Star Trek: Deep Space Nine)
Although not mentioned in dialogue, the company's name was listed on a Promenade directory map seen in many episodes of Deep Space Nine.