The Dow Jones Industrial Average hit an all-time intraday high on Friday, making it the last of the three major U.S. indexes to clinch a record in Wall Street's rally fueled by the prospect of a looser monetary policy,

The Dow on Friday was on pace to hit its first record high of the year, reflecting steady optimism on Wall Street despite signs of underlying turbulence in the economy.

Buffett owned UnitedHealth shares before selling his stake in 2010, though his Berkshire Hathaway recently acquired shares.