ARNC Arconic Corporation

NEW YORK, Aug. 16, 2023 /PRNewswire/ -- Chesapeake Energy Corp. (NASD:CHK) will replace Mercury Systems Inc. (NASD: MRCY) in the S&P MidCap 400, and Mercury Systems will replace Arconic Corp. (NYSE: ARNC) in the S&P SmallCap 600 effective prior to the opening of trading on Monday, August 21. Apollo Global Management Inc. (NYSE:APO) is acquiring Arconic in a deal that is expected to close soon, pending final closing conditions. Mercury Systems is more representative of the small-cap market space.

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

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