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.

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.

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'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,

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.

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.

US stocks were mixed on Friday as Wall Street tempered its rate-cut hopes amid economic data this week showing higher-than-expected wholesale inflation and a rise in July retail sales. Traders were also awaiting Friday's meeting between President Trump and Vladimir Putin,