“The fortune 500”

The Fortune 500 is an annual list compiled and published by Fortune magazine that ranks the top 500 U.S. closely held and public corporations as ranked by their gross revenue after adjustments made by Fortune to exclude the impact of excise taxes companies incur. The list includes publicly and privately held companies for which revenues are publicly available. The first Fortune 500 list was published in 1955. 1) Walmart, is an American multinational retail corporation that runs chains of large discount department stores and warehouse stores.

The company is the world's third largest public corporation, according to the Fortune Global 500 list in 2012, the biggest private employer in the world with over two million employees, and is the largest retailer in the world. Walmart remains a family-owned business, as the company is controlled by the Walton family, who own a 48 percent stake in Walmart. It is also one of the world's most valuable companies.

Headquarters: Bentonville, Ark. Revenue: $469.2 billion Profit: $16.9 billion 2013 rank: 1

Wal-Mart and ExxonMobil have traded the top spot back and forth several times, but the world’s largest retailer comes out on top this time despite a year rife with controversy: It faces accusation that its Mexican subsidiary bribed government officials in order to expand locations there, and the probe has since expanded to Brazil, India, and China. Nevertheless, the retailer operates a multinational empire, with 10,800 stores operating in 26 nations besides the US, and employing some 2.2 million employers, making it the largest private employer in the world.

2) ExxonMobil, is an American multinational oil and gas corporation headquartered in Irving, Texas, United States. It is a direct descendant of John D. Rockefeller's Standard Oil company, and was formed on November 30, 1999, by the merger of Exxon and Mobil(formerly Standard Oil of New York and Standard Oil of New Jersey.) It is affiliated with Imperial Oil which operates in Canada.

ExxonMobil is the world's largest company by revenue and in 2013 became the largest publicly traded company by market capitalization in the world. The company is ranked #5 globally in Forbes Global 2000 list in 2013. Exxon Mobil's reserves were 72 billion oil-equivalent barrels at the end of 2007 and, at then (2007) rates of production are expected to last over 14 years.

With 37 oil refineries in 21 countries constituting a combined daily refining capacity of 6.3 million barrels (1,000,000 m3), Exxon Mobil is the largest refiner in the world, a title that was also associated with Standard Oil since its incorporation in 1870. ExxonMobil is the largest of the world's super majors with daily production of 3.921 million BOE (barrels of oil equivalent). In 2008, this was approximately 3% of world production, which is less than several of the largest state-owned petroleum companies. When ranked by oil and gas reserves it is 14th in the world with less than 1% of the total.

Headquarters: Irving, Texas Revenue: $449.9 billion Profit: $44.9 billion 2013 rank: 2

ExxonMobil (another descendant of Standard Oil) lost the top spot in the Fortune ranking this year, but not for any lack of success. Its $44.8 billion profit in 2012 was its highest ever, and the second-highest in US history. In terms of stock market value, it’s the largest company in the world, just edging out Apple. It's also the world's largest oil refiner.

Chevron, is an American multinational energy corporation headquartered in San Ramon, California, United States. It operates in more than 180 countries. Chevron is engaged in the oil, gas, and geothermal sectors, including exploration and production; refining, marketing and transport; chemicals manufacturing and sales; and power generation. Chevron is one of the world's six "super major" oil companies.

For the past five years (through 2012) Chevron has been ranked as America's third largest corporation in the Fortune 500. In 2011 it was named the 16th largest public company in the world by Forbes Global 2000. Chevron is one of the largest corporations in the world by revenue. Headquarters: San Ramon, Calif

Revenue: $233.9 billion Profit: $26.2 billion 2013 rank: 3

Chevron (once part of John Rockefeller’s Standard) is the country’s second-largest oil company and one of the biggest operators of deep-water wells in the Gulf of Mexico. It has also become active in acquiring natural gas drilling rights in the Shale formation in Pennsylvania. The company maintains its No. 3 Fortune 500 ranking by a wide margin. Its profit margin, $26.2 billion, was the second-largest in company history. Chevron earned $26.9 billion in 2011.