CDW Corp. will join the S&P 500 index this month, and shares jumped more than 5% Tuesday in after-hours trading following the announcement. S&P Global announced Tuesday afternoon that the tech company would enter the index ahead of trading on Monday, Sept. 23, to replace Total System Services Inc. , which is being acquired by Global Payments Inc. CDW shares have increased more than 40% so far this year, as the S&P 500 index has gained 19.9%.
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