Why Frontline Stock Popped, but Exxon and ConocoPhillips Dropped

There's one great reason why Frontline is outperforming Exxon and Conoco stocks today.Uh-oh. OPEC is up to something, and it's probably not good for oil stocks -- or more precisely, not good for all oil stocks.Over the weekend, the OPEC+ group of oil producing nations, plus a few that aren't officially a part of the cartel, such as Russia, announced plans to "surge" production of oil in June, as CNBC reports. Stocks of oil-producing companies including ExxonMobil (XOM -2.56%) and ConocoPhillips (COP -3.10%) ...