TheStreet. Warren Buffett is arguably the most successful investor of all time. He's amassed an amazingly massive net worth by buying and usually holding stocks for the long haul. Trained under legendary value fund investor Benjamin Graham,

B stake in UnitedHealth Group Incorporated signals a market shift. Click for why I have now upgraded UNH stock to Buy.

Bloomberg journalists discuss today's biggest winners and losers in the stock market. Listen for analysis on the companies making news on Wall Street.

UnitedHealth Group ( UNH 12.04%) has been a solid dividend growth stock for years. Generally, its yield has been fairly low, due to the stock's rising value. Even as the healthcare insurance giant has grown its dividend, its yield hasn't been particularly high or noteworthy.

UnitedHealth Group Incorporated (NYSE:UNH) is one of the stocks Jim Cramer shed light on. Cramer showed a slight bit of optimism toward the company as he said: “I think UnitedHealth’s going to work

Stocks were mixed Friday after the University of Michigan’s consumer sentiment index fell from the prior month and ahead of a scheduled summit between President Donald Trump and Russian leader Vladimir Putin.