David Tepper pumped $520 million into Alibaba (BABA)

David Tepper's Appaloosa fund added a large stake in Alibaba in the second quarter.
The fund added 3.69 million shares valued at $520.5 million, making it one of the top positions held by the fund.
Alibaba has been a popular bet this quarter. Shares are up 74.48% this year and other funds, like Daniel Loeb's Third Point, have added positions in the company in the second quarter.
Appaloosa also added positions in a Nasdaq 100 ETF from PowerShares and a Nasdaq Biotech ETF from iShares.