Take context from the input text and decide on the accurate relationship between 'Appaloosa Management' and 'David Tepper' from the options provided.
Options: position held, publisher, founded by, subsidiary

Hedge fund mogul David Tepper was one of the investors pressuring the company early in the year and in the second quarter his Appaloosa Management bought an additional 3.5 million shares, raising its stake to 18.8 million.
founded by