U.S. stocks ended a wobbly day mostly lower in what has been a rocky week because of worries coming out of the bond market ...

UnitedHealth has gone from bad to worse, and its drop is impacting the Dow Jones Industrial Average even more than it is the ...

Stocks clawed back their earlier losses on Monday as investors shook off a downgrade of the U.S.’ credit rating by Moody’s.

UnitedHealth's 52-week high is over $630 a share -- meaning its drawdown has had an impact of roughly 4 percentage points on the Dow, or roughly 3 percentage points YTD. That's the difference ...

Now they're also hurting one of the top gauges of the U.S. stock market, as UnitedHealth's plunging shares weigh down the Dow. UnitedHealth is one of the 30 companies that makes up the Dow Jones ...

The health care giant's shares are down more than 50% in the last month. That's hurting the powerful U.S. stock-market index.