Microsoft Chairman and founder Bill Gates may have been overtaken on the world's richest list by Mexican telecommunications tycoon Carlos Slim, according to a Mexican financial news service quoted by Reuters.

On this spring's Forbes list, Slim was just behind Warren Buffett, an investor and CEO of Berkshire Hathaway, who had been second on the list for years.

Forbes reported then that Gates, who had topped its list for 13 years, and Buffet, were quickly losing ground to Slim. In April, Forbes reported that Slim had overtaken Buffet and was on his way to passing Gates.

A 27 percent surge in the stock price of Slim's wireless company, American Movil, in the second quarter, has put his worth at close to $67.8 billion, Reuters reported Tuesday.

Reuters quoted financial tracker Eduardo Garcia, from Sentido Comun, an online financial publication. Garcia estimated that Gates was worth $59.2 billion, according to the report.

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