Chart created using Benzinga ProExxon is up about 25% over the same period, while Chevron has gained about nearly 21% — strong moves, but nowhere near Kosmos' vertical climb.Oil's Biggest Winner Isn't Who Investors ExpectKosmos' outperformance is even more striking in recent weeks. The stock has surged 62.20% over the past month alone, dramatically outpacing Exxon's 11.81% gain and Chevron's 10.39% rise over the same period.The move highlights how smaller upstream producers like Kosmos can act as leveraged ...