Wall Street Journal (blog) | Marathon Oil to buy Oklahoma-based PayRock Energy Reuters Oil and natgas producer Marathon Oil Corp (MRO.N) said it agreed to buy PayRock Energy Holdings LLC for $888 million from venture capital firm EnCap Investments, boosting its presence in the Oklahoma basin. Marathon Oil, which held about 265,000 net ... Stocks to Watch: LendingClub, Marathon Oil, JD.com, Wal-Mart, Perrigo Marathon Oil to buy PayRock Energy for $888 million Marathon Oil (MRO) to Acquire PayRock Energy Holdings in $880M Deal |