Berkshire reveals $6.72 billion stake in insurer Chubb
By Jonathan Stempel (Reuters) – Warren Buffett’s Berkshire Hathaway on Wednesday revealed a new, $6.72 billion stake in the insurer Chubb, ending months of speculation that it had made a big new investment. In a regulatory filing describing its U.S.-listed stock holdings as of March 31, Berkshire said it owned 25.92 million shares of Chubb….