U.S. stock indexes close lower amid regulatory concerns

U.S. stocks ended lower on Monday, weighed down by a slide in Nvidia, as the combination of regulatory concerns and macroeconomic anticipation weighed on sentiment, leaving investors cautious as the week unfolds.

The Dow Jones Industrial Average fell 240.59 points, or 0.54 percent, to 44,401.93. The S&P 500 sank 37.42 points, or 0.61 percent, to 6,052.85. The Nasdaq Composite Index shed 123.08 points, or 0.62 percent, to 19,736.69.

Nine of the 11 primary S&P 500 sectors ended in red, with financials and communication services leading the laggards by losing 1.41 percent and 1.31 percent, respectively. Meanwhile, health and real estate led the gainers by going up 0.22 percent and 0.09 percent, respectively.

Nvidia stock slipped 2.55 percent on Monday after China opened an antitrust investigation into the chip giant. "The market was taken a bit by surprise regarding China's investigating (Nvidia) as a possible antimonopoly-law violation. So that's one thing that's putting a little damper on the market," said Sam Stovall, chief investment strategist at CFRA Research in New York.

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