Extra Space Storage Inc. shares advanced in the extended session Wednesday after S&P Dow Jones Indices said the storage-space real-estate investment trust would replace Chubb Corp. on the S&P 500 Index . Extra Space shares rose 2% to $91.30 after hours. The change is scheduled to occur after the close of trade on Jan. 15, when ACE Ltd. is expected to close on its acquisition of Chubb.
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