While the "vote of confidence" from Buffett's investment validates the long-term value of UnitedHealth shares, the "management needs to regain trust and credibility with investors, and get back to its beat and raise reputation of the past," said James Harlow, senior vice president at Novare Capital Management.

Berkshire Hathaway’s (BRK/A, BRK/B) second-quarter 13F was filed after the market closed on August 14.

Buffett and his team added to six existing positions and started six brand new ones.

The Dow Jones Industrial Average and S&P 500 rose to new record highs Friday, as the Dow benefited from UnitedHealth Group’s stock pacing its largest single-day gain in nearly five years in the wake o...

Hopes of a Federal Reserve rate cut next month have boosted stocks in recent weeks.