Diamondback Energy (NASDAQ:FANG) stock rose after the oil producer said it would pay $26 billion for privately held Endeavor Energy.The cash and stock deal, with Diamondback holding a majority stake, continues a trend of consolidation in the oil business around the heavily-fracked Permian Basin of west Texas and New Mexico.Last fall Exxon Mobil (NYSE:XOM) said it will buy Pioneer Natural (NYSE:PXD) for $64.5 billion. Then Chevron (NYSE:CVX) bought Hess (NYSE:HES), for $53 billion. FANG stock opened this mor ...