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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.