Private Companies Dominate U.S. Upstream M&A in Q1 2016 By: TalkMarkets April 12, 2016 at 09:42 AM EDT Privately held companies had a huge impact on the United States’ upstream oil and gas industry in recent months. Read More >> Related Stocks: Chesapeake Energy Concho Resources Inc ConocoPhillips Dominion Resources Ep Energy Corp Wpx Energy Inc