Here there is a list of the biggest petroleum (oil and gas) companies in the world as of 2026. Rankings vary depending on the metric—revenue (often led by state-backed or refining-heavy firms), market capitalization (favoring publicly traded integrated majors with investor valuation), or production/reserves.
The most common modern ranking for “biggest” in the industry uses market capitalization for publicly traded companies (widely available and updated daily), where Saudi Aramco dominates by a large margin.
Top Petroleum Companies by Market Capitalization (March 2026)
- Saudi Aramco (Saudi Arabia) — ~$1.74 trillion
The world’s largest by far, state-owned giant with massive reserves and production. - ExxonMobil (United States) — ~$650 billion
Leading U.S. supermajor, strong in upstream and integrated operations. - Chevron (United States) — ~$390–395 billion
Major integrated player with significant Permian and global assets. - PetroChina (China) — ~$330–335 billion
Part of CNPC group, huge in production and domestic market. - Shell (United Kingdom/Netherlands) — ~$250 billion
Global supermajor with strong LNG and diversified energy focus.
Other notable large players
- TotalEnergies (France) — around $170 billion range
- CNOOC (China) — around $170 billion range
- ConocoPhillips (United States) — around $140 billion range
- Sinopec (China) — lower market cap but massive in revenue/refining
By Revenue (Trailing Twelve Months / Recent Fiscal, Publicly Traded Focus)
Revenue rankings often place Chinese firms and refining-heavy companies higher due to scale in downstream operations:
- Saudi Aramco — ~$460 billion
- Sinopec (China) — ~$445 billion
- PetroChina — ~$395 billion
- ExxonMobil — ~$325 billion
- Shell — ~$269 billion
Some state-owned entities like China National Petroleum Corporation (CNPC) or others report even higher revenues in broader Fortune Global 500 lists, but they are less transparent or not fully publicly traded.
These figures fluctuate with oil prices, production levels, and market conditions. Saudi Aramco remains the undisputed leader in most metrics, followed by U.S. supermajors like ExxonMobil and Chevron. For visuals of these companies’ logos or operations: