UnitedHealth Group has attracted major contrarian investors like Buffett, Burry, and Simons. Click here to read why UNH stock is a Buy.

Berkshire’s Big Bet on UnitedHealth Berkshire Hathaway’s (NYSE:BRK-A)(NYSE:BRK-B) release yesterday of its latest 13F filing sent ripples through the market as it revealed a new 5 million share stake in UnitedHealth Group (NYSE:UNH) worth approximately $1.

Year to date, the stock has fallen by nearly 45%, which is by no means normal for the healthcare stock. In fact, this is the worst it has performed since the Great Recession, when it tumbled by more than 54% in 2008.

UnitedHealth Group is scheduled to report second-quarter results ahead of the opening bell on Tuesday, with markets expecting the health insurance giant's stock to make a substantial move by the end of the week.

UnitedHealth Group (NYSE: UNH) is a top health care stock with recent turbulence in earnings guidance, rising costs, and hedge fund activity.

UnitedHealth Group Inc. (NYSE:UNH) shares climbed Friday after high-profile investors Michael Burry and Warren Buffett took positions in the insurance giant, offering some relief to a stock that has tumbled about 41% year-to-date.

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's EPS estimates face uncertainty amid a DOJ probe, but a 5.2% dividend hike highlights stability. Read why the market has overreacted on UNH's return/risk profile.