Moderna Inc. (NASD:MRNA) will replace Alexion Pharmaceuticals Inc. (NASD:ALXN) in the S&P 500 effective prior to the opening of trading on Wednesday, July 21. AstraZeneca Plc (LSE:AZN; NASD:AZN) is acquiring Alexion Pharmaceuticals in a deal expected to be completed soon pending final closing conditions.

Following is a summary of the changes that will take place prior to the open of trading on the effective date:

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