Billionaire Mukesh Ambani on Monday became the richest person in the world, surpassing American software czar Bill Gates, Mexican business tycoon Carlos Slim Helu and famous investment guru Warren Buffett, courtesy the bull run in the stock market.

Ambani brothers Mukesh and Anil have been jointly named among the world's 50 most influential people in business, thanks to their rivalry that has goaded them to steer their respective businesses to new heights.

The media had reports that Reliance Industries Ltd may acquire a stake in Welspun Gujarat Stahl Rohren Limited.