In the Fortune Global 500, a list that ranks global companies by revenue, four of the top five players are in the oil and gas industry.
Walmart tops the list with $476 billion in annual revenue.
Then comes Royal Dutch Shell with $459 billion annual revenue.
Sinopec and CNPC fill the third and fourth positions with $457 billion and $432 billion respectively.
ExxonMobil lands fifth with $407 billion in annual revenues.
Take a look at the full Fortune Global 500 here.