Warren Buffett is now the world's second-richest person as Berkshire Hathaway's stock rallied to an all-time high.
Forbes said its real-time ranking of the world's billionaires now estimates Buffett's wealth at $74.4 billion, about $1.5 billion more than Carlos Slim's $72.9 billion. Slim is now in third place.
Class A shares of Buffett's Berkshire Hathaway closed at a record $227,800 after hitting an all-time intraday high of $229,374 in Monday's trading. They're up 28 percent for the year, trouncing the S&P's 11.5 percent gain, excluding dividends.
In March, Forbes estimated Buffett's fortune at $58.2 billion. He was No. 4 on the list at that time, behind Mexico's Slim with $72 billion and Spanish fashion executive Amancio Ortega with $64 billion.