The world's 500 largest companies generated $31.2 trillion in revenues and $1.7 trillion in profits in 2014

Seven Indian companies, including Reliance Industries and Tata Motors, are among the world's 500 largest companies, according to a list compiled by Fortune that has been topped by retail giant Walmart.

The Indian companies on the 2015 Fortune Global 500 list are Indian Oil ranked 119 on the list with revenues of about $74 billion, Reliance Industries (158) with revenues of $62 billion, Tata Motors with revenues of $42 billion (254), State Bank of India with revenues of $42 billion (260), Bharat Petroleum with revenues of $40 billion (280), Hindustan Petroleum with revenues of $35 billion and Oil and Natural Gas Corporation with revenues of $26 billion (449).

The world's 500 largest companies generated $31.2 trillion in revenues and $1.7 trillion in profits in 2014.

This year's Fortune Global 500 employ 65 million people worldwide and are represented by 36 countries.

The list has been topped by Walmart, which has retained its numero uno spot.

It is followed by Chinese petroleum refining giant Sinopec Group on the second spot, Netherlands-based Royal Dutch Shell (3), China National Petroleum (4) and Exxon Mobil (5).

The US is home to 128 of the 500 global companies, including Apple (15), JP Morgan Chase (61), IBM (82), Microsoft (95), Google (124), Pepsi (141), Intel (182) and Goldman Sachs (278).

China has close to 100 companies on the list, including Bank of China (45), China Railway Engineering (71) and China Development Bank (87).

While Indian Oil, Reliance, Bharat Petroleum, Hindustan Petroleum, and Oil and Natural Gas slipped in rankings from the previous year, Tata Motors and SBI improved in rankings.

Companies are ranked by total revenues for their respective fiscal years ended on or before March 31, 2015.

Revenue figures include consolidated subsidiaries and reported revenues from discontinued operations, but exclude excise taxes.