NEW YORK, March 7, 2012 /PRNewswire/ -- Crown Castle International Corp. (NYSE: CCI) will replace Constellation Energy Group, Inc. (NYSE: CEG) in the S&P 500 index after the close of trading on a date to be announced. S&P 100 & 500 constituent Exelon Corp. (NYSE: EXC) is acquiring Constellation Energy Group in a deal expected to be completed soon pending final approvals.

Crown Castle International owns, operates, and leases shared wireless infrastructure. Headquartered in Houston, TX, the company will be added to the S&P 500 GICS Wireless Telecommunication Services Sub-Industry index.

Following is a summary of the change:

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