Alexion Pharma (ALXN) to Replace Motorola Mobility (MMI) in S&P 500

Alexion Pharmaceuticals, Inc. (NASDAQ: ALXN) will replace Motorola Mobility Holdings, Inc. (NYSE: MMI) in the S&P 500 index after the close of trading on Thursday, May 24. S&P 100 & 500 constituent Google Inc. (NASDAQ: GOOG) is acquiring Motorola Mobility Holdings in a deal expected to close before the opening of trading tomorrow.

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