The company made a return to the Formula One in by unofficially supplying the Sauber team with engines. The next year, the partnership was made official. For , Mercedes change teams and started supplying engines to the McLaren. Mercedes also purchased a small portion of the McLaren. McLaren won three drivers' championships and one constructors' championship between 1995 and . In 2009, Mercedes began supplying engines to the Brawn GP and Force India teams. In 2009, Brawn won both the driver's and constructors' championship.