Mercedes Grand Prix is the name of a Formula One racing team and constructor. The team debuted in Formula One in 1954, and competed with great success in the 1954 and 1955 seasons. However, after the 1955 season, Mercedes left the sport, and despite part-ownerships, and engine supplier deals in the 1990s and 2000s, it did not return as a factory team until 2010. The 2010 team was announced in November 2009, when after a fifteen-year relationship with the McLaren team, Mercedes-Benz (through parent Daimler AG), in partnership with Aabar Investments purchased a 75.1% stake (Daimler: 45.1%; Aabar: 30%), in the Brawn GP team. Brawn had won the drivers' and constructors' championships in the 2009 season, their only season as a team following their buy-out of the Honda Racing F1 team.