NEW YORK, Dec. 21, 2021 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P MidCap 400:

Voya Financial, Inc. (NYSE: VOYA) will replace CoreSite Realty Corp. (NYSE: COR) in the S&P MidCap 400 effective prior to the opening of trading on Tuesday, December 28. S&P 500 / 100 constituent American Tower Corp. (NYSE: AMT) is acquiring CoreSite Realty 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:

Effective Date

Index Name      


Company Name


GICS Sector

December 28, 2021

S&P MidCap 400


Voya Financial



S&P MidCap 400


CoreSite Realty


Real Estate

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S&P Dow Jones Indices is a division of S&P Global (NYSE: SPGI), which provides essential intelligence for individuals, companies, and governments to make decisions with confidence. For more information, visit


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