Buffett's Berkshire Hathaway joins S&P500

Berkshire, the $176bn (£112bn) conglomerate run by Buffett for 45 years, enters the index following the $26.3bn acquisition of railway operator Burlington Northern Santa Fe, the Telegraph reports. As a result, $1trn of consumer-backed index funds have been forced to buy stakes in Berkshire. It is estimated the funds would have to buy an estimated 150m-175m shares of Berkshire's class B shares worth $11.3bn to $13.2bn in order to ensure the correct weighting of Berkshire in their funds. Berkshire B shares, often known as the 'Baby Berks', have risen from $68 in late January to $76.9...