A hydrocarbon specialist headquartered in Midland, Texas, Diamondback Energy (NASDAQ: FANG ) focuses on exploration. It's involved in petroleum, natural gas and natural gas liquids, or NGLs. Since the beginning of this year, FANG gained a healthy 37% of equity value. In the trailing month, shares zoomed up almost 38%. Presently, the company has a market cap of $27.2 billion.