Company Close Updates: CDW Corp. stock falls Monday, underperforms market
 Shares of CDW Corp.
 CDW,
 -1.03%
slid 1.03% to $165.76 Monday, on what proved to be an all-around rough trading session for the stock market, with the S&P 500 Index
 SPX,
 -0.08%
falling 0.08% to 4,226.52 and Dow Jones Industrial Average
 DJIA,
 -0.36%
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