U.S. mutual funds boost own performance with unicorn mark-ups

By Tim McLaughlin and Heather Somerville BOSTON/SAN FRANCISCO (Reuters) - Some U.S. mutual funds are boosting their performance with relatively big bets on private companies such as Uber and Pinterest, which they have been marking up at a rate far greater than the broad stock market. Relied upon by millions of Americans to save for their retirement, mutual funds emphasise that their investments in young tech companies ahead of their initial public offerings are relatively small. A Reuters analys