Billionaire rank: 1,999 Firm name: Pershing Square Biggest buy: United Technologies (UTX) Biggest sell: Starbucks (SBUX) Top-3 holdings: Restaurant Brands International (QSR), Chipotle (CMG), Lowes (LOW) Source: WalletHubBillionaire rank: 3 Firm name: Greenlight Capital Biggest buy: CNX Resources (CNX) Biggest sell: General Motors (GM) Top-3 holdings: General Motors (GM), Green Brick Partners (GRBK), AerCap Holdings (AER) Source: WalletHubBillionaire rank: 1,399 Firm name: Tiger Management Biggest buy: Facebook (FB) Biggest sell: NXP Semiconductors (NXPI) Top-3 holdings: Microsoft (MSFT), Apollo Global Management (APO), Facebook (FB) Source: WalletHubBillionaire rank: 1,394 Biggest buy: Trian Partners Biggest buy: NVT (nVent Electric) Biggest sell: SYSCO Corporation (SYY) Top-3 holdings: Proctor & Gamble (PG), SYSCO Corporation (SYY), Mondelez International (MDLZ) Source: WalletHubBillionaire rank: 729 Firm name: Third Point Capital Biggest buy: United Technologies (UTX) Biggest sell: Merck & Co. (MRK) Top-3 holdings: Baxter International (BAX), United Technologies (UTX), Campbell Soup (CPB) Source: WalletHubBillionaire rank: 261 Firm name: Paulson & Co. Biggest buy: Celgene (CELG) Biggest sell: NXP Semiconductors (NXPI) Top-3 holdings: Bausch Health Companies (BHC), Celgene (CELG), Discovery Inc (DISCK) Source: WalletHubBillionaire rank: 190 Firm name: Soros Fund Management Biggest buy: Ceridian (CDAY) Biggest sell: Caesars Entertainment (CZR) Top-3 holdings: Liberty Broadband (LBRDK), VICI Properties (VICI), Caesars Entertainment (CZR) Source: WalletHubBillionaire rank: 138 Firm name: Appaloosa Management Biggest buy: PG&E Corp. (PCG) Biggest sell: Allstate (ALL) Top-3 holdings: Micron Technology (MU), PG&E Corp. (PCG), Allergan (ALL) Source: WalletHubBillionaire rank: 73 Biggest buy: Caesars Entertainment (CZR) Biggest sell: Dell Computers (DELL) Top-3 holdings: CVR Energy (CVR), Herbalife Nutrition (HLF), Cheniere Energy (LNG) Source: WalletHubBillionaire rank: 67 Firm name: Bridgewater Biggest buy: Biogen (BIIB) Biggest sell: Celgene (CELG) Top-3 holdings: Biogen (BIIB), Bristol-Myers Squibb (BMY), United Rentals (URI) Source: WalletHubBillionaire rank: 52 Firm name: Renaissance Biggest buy: Starbucks (SBUX) Biggest sell: Apple (AAPL) Top-3 holdings: Verisign (VRSN), Palo Alto Networks (PANW), Chipotle (CMG) Source: WalletHubBillionaire rank: 3 Firm name: Berkshire Hathaway Biggest buy: JPMorgan (JPM) Biggest sell: Wells Fargo (WFC) Top-3 holdings: Apple (AAPL), Bank of America (BAC), Coca-Cola (KO) Source: WalletHubThe 10 countries with the biggest piles of gold