Technology leadership is crucial in energy. But it is difficult to discern. Hence, we reviewed 3,000 patents across the 25 largest companies. This note ranks the industryโs โTop 10 technology-leadersโ: in upstream, offshore, deep-water, shale, LNG, gas-marketing, downstream, chemicals, digital and renewables. In each case, we profile the leading company, its edge and the proximity of the competition.