UNH stock soared after Warren Buffett’s Berkshire Hathaway revealed it bought shares of the healthcare company. Nonetheless, UnitedHealth faces a long list of unresolved issues.

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.

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

Berkshire Hathaway recently filed its second-quarter 13F form, revealing its stock holdings at the end of June.

UnitedHealth Group's public reputation is still reeling, yet its battered stock has been something that more and more investors can't seem to resist. Why it matters: Recent interest in its stock, from everyday investors to Wall Street's titans,

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Despite some challenges to its business recently, UnitedHealth has held steadfastly to its dividend policy. It switched from an annual to a quarterly disbursement in 2010, and has raised it on a regular basis since then. Over that stretch of time, it has risen strongly from $0.03 to the present level.