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.

The company may be under criminal investigation for alleged irregularities in its Medicare business—but it's been touched by the Warren Buffett effect.

The Dow Jones Industrial Average opened at its first all-time high of the year on Friday as shares of health care giant UnitedHealth Group soared.

Top political and market headlines this weekend include stock trades by lawmakers, Trump's tech export tax, and calls for Fed action after weak job data.

U.S. equities were mixed at midday following the release of the July retail sales report, which came in as expected.

UnitedHealth's yield is typically less than 2%, but nowadays, it's well over 3%. The stock experienced a steep decline in value this year as its financials underwhelmed investors. Rising costs, utilization rates,