A steep slide in UnitedHealth Group shares was dragging on the Dow Jones Industrial Average on Thursday, putting the blue-chip index on track for historical underperformance versus the S&P 500.

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 between ...

UnitedHealth was on pace for its largest same-day percentage decrease since a 28% decline on Aug. 6, 1998, according to Dow Jones Market Data. Weighing most on the stock was a significant cut to ...

UnitedHealth is one of the 30 companies that makes up the Dow Jones Industrial Average, the powerful stock market index that aims to represent some of the most important companies in the U.S. economy.

The Dow is price-weighted, meaning that changes in the highest-priced stocks have greater impact on the index level than price changes in the lower-priced stocks. The S&P 500, however, is market ...

UnitedHealth's decline on Thursday, for instance, shaved as many as 800 points off the Dow all on its own. Read more: Here's what to do with your retirement savings in a market sell-off ...

The Dow was down 160 points, or 0.4%, but UnitedHealth stock was shaving 382 points off the index on its own with a nearly 17% drop. UnitedHealth is regularly a thorn in the Dow’s side due ...

STORY: U.S. stocks ended mixed on Tuesday, with the Dow gaining just under one percent, the S&P 500 edging down marginally ...

UnitedHealth's decline on Thursday, for instance, shaved as many as 800 points off the Dow all on its own. Read more: Here's what to do with your retirement savings in a market sell-off ...