Throughout its lifetime, the 911 has been modified by private teams and by the factory itself for racing, rallying and other forms of automotive competition. It is among the most successful competition cars ever. In the mid-1970s, naturally aspirated 911 Carrera RSRs won major world championship sports car races such as Targa Florio, Daytona, Sebring and Nürburgring, even against prototypes.
From 1994 until 2007, Aston Martin was a wholly owned subsidiary of the Ford Motor Company, becoming part of Ford's Premier Automotive Group when it was formed in 2000. In March 2007, a consortium of investors led by Prodrive boss David Richards purchased 90% of Aston Martin for £479 million, with Ford retaining a £40 million stake. In December 2012, the Italian private equity fund Investindustrial signed a deal to buy 37.5% of Aston Martin, investing £150 million as a capital increase.