Chevron (NYSE:CVX) is the highest-ranked Fortune 1000 company (No. 3) to achieve a perfect score of 100. It is the top-rated oil and gas company in the nation offering at least one transgender-inclusive health care coverage plan. Chevron also was the first major integrated energy company to include sexual orientation in its nondiscriminatory policies. In terms of diversity, it mops the floor with rival Exxon Mobil (NYSE:XOM).