Leading oil and gas producers based on market cap October 2021

Exxon Mobil has the highest market capitalization of any oil and gas producer worldwide. As of October 4, 2021, the United States-based company had a market cap of 257.95 billion U.S. dollars. Of the ten largest companies, five were considered Big Oil companies. Reliance Industries, the Indian conglomerate, which operates the world's largest oil refinery complex and is also involved in retail and telecommunications, ranked second, with a market cap of over 226 billion U.S. dollars.

KPI's of top oil & gas companies

While there has been little change in what companies are counted among the largest within their industry, their ranking varies depending on the metric used. Although ExxonMobil has often ranked first in terms of market capitalization, China's Sinopec was found to be the leading oil and gas company worldwide based on revenue in the 2020/2021 fiscal year, with ExxonMobil ranking third. Meanwhile, state-owned enterprises such as Gazprom and PetroChina are the leading oil and gas companies worldwide by employment. In 2021, their respective workforce was over 430,000 people strong.

Most valuable oil equipment and service providers

Canada-based Enbridge is the largest oil and gas equipment and service providers based on market cap worldwide, with their outstanding stock shares valued at 80.97 billion U.S. dollars on October 4, 2021. Oilfield service companies are generally not involved in oil production but instead provide services for companies undergoing exploration and production such as the lending of rigs or oil and gas transportation to refineries and consumer markets.