Dow Faces Historic Divergence From S&P After UnitedHealth Plunge

Traders work on the floor of the New York Stock Exchange.

Photographer: Michael Nagle/Bloomberg
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A double-digit selloff in UnitedHealth Group Inc. is dragging down the blue-chip Dow Jones Industrial Average, pushing it toward a day of historical underperformance.

The Dow Jones Industrial Average fell 1.2% Thursday, weighed down by a 18% plunge in UnitedHealth after the firm cut its annual forecast and reported its first earnings miss in more than a decade. The S&P 500 Index gained as much as 0.6%.