Soros Fund Management added Facebook, Apple, and Twitter, and dramatically boosted its shares in BlackRock in the quarter. : Soros Fund Management added Facebook, Apple, and Twitter, but trimmed stakes in Alphabet and Amazon.com in the quarter through June, according to a regulatory filing on Tuesday. The family office of billionaire George Soros also bought stakes in AT&T, Chevron, and T-Mobile US, and divested stakes in eBay, Nvidia, Snap, and Paypal.