Shares of Under Armour Inc. slumped 0.8% in premarket trading Monday, after S&P Dow Jones Indices said it was booting the athletic apparel and gear maker from the S&P 500 . The company, and IPG Photonics Corp. , are moving down from the large capitalization index to the S&P MidCap 400 , S&P Dow Jones Indices said late Friday, while Trinity Industries Inc. and Yelp Inc. are dropping to the S&P SmallCap 600 . Shares of Keurig Dr Pepper Inc. rallied 8.1% and ON Semiconductor Corp. climbed 7.2%, as the companies are replacing Under Armour and IPG Photonics in the S&P 500.
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