Mahoney Asset Management President Ken Mahoney in Reuters

US STOCKS-Wall St tumbles on weak consumer sentiment, rising bond yields

The S&P 500 and the Nasdaq headed for their worst day in four months on Tuesday as weak consumer confidence data deepened concerns over slowing economic growth, while a surge in Treasury yields hit mega-cap technology stocks.

At 11:53 a.m. ET, the Dow Jones Industrial Average was down 516.54 points, or 1.48%, at 34,352.83.

The S&P 500 was down 88.15 points, or 1.98%, at 4,354.96, and the Nasdaq Composite was down 408.64 points, or 2.73%, at 14,561.33, both tracking their worst day since early May.

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