Shares of Activision Blizzard Inc. and United Continental Holdings Inc. both jumped in the extended session after S&P Dow Jones Indices said it will add the videogame publisher and the airline to the S&P 500 Index . Activision shares surged 6.3% to $29.70 and United shares rallied 6.7% to $56.92. The companies will replace Pall Corp. and Hospira Inc. , which are both being acquired. Activision will join the S&P 500 around Aug. 28, and United will join Sept. 2.
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