In addition to the US, its operations span across several countries including Mexico, Canada, Japan, Chile, Argentina, Britain, Brazil, and India. In revenue, Walmart holds the mouthwatering sum of $485,873 million, making it the world’s richest company by revenue. China has three oil companies that is run by the state. Of these three, PetroChina is the largest. It also has the highest market capitalization compared to the other petroleum giants that are traded in the stock market. By far the wealthiest company in the U.S. by total cash value is Apple, which has a record of nearly $238 billion in cash, cash equivalents, and marketable securities in its most recent quarter.