Oil stocks are shares of companies involved in the exploration, production, refining, transportation, or sale of crude oil and related energy products. Get alerts:ExxonMobil (XOM)ExxonMobil Corporation engages in the exploration and production of crude oil and natural gas in the United States and internationally. The Upstream segment explores for and produces crude oil and natural gas. The Upstream segment is involved in the exploration, development, production, and transportation of crude oil and natural gas; processing, liquefaction, transportation, and regasification of liquefied natural gas; transportation of crude oil through pipelines; transportation, storage, and marketing of natural gas; and carbon capture and storage, as well as a gas-to-liquids plant. It explores for and extracts crude oil, natural gas, and natural gas liquids; markets and transports oil and gas; produces gas-to-liquids fuels and other products; and operates upstream and midstream infrastructure to deliver gas to market.