S&P MidCap 400 constituent Vistra Corp. (NYSE:VST) will replace Pioneer Natural Resources Co. (NYSE: PXD) in the S&P 500, S&P SmallCap 600 constituent Aaon Inc.(NASD: AAON) will replace Vistra in the S&P MidCap 400, and Marathon Digital Holdings Inc.(NASD: MARA) will replace Aaon in the S&P SmallCap 600 effective prior to the opening of trading on Wednesday, May 8. S&P 500 and S&P 100 constituent Exxon Mobil Corp. (NYSE: XOM) acquired Pioneer Natural Resources in a deal that closed today, Friday May 3.

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 Action Company Name Ticker GICSSector May 8, 2024 S&P 500 Addition Vistra VST Utilities S&P 500 Deletion Pioneer Natural Resources PXD Energy S&P MidCap 400 Addition Aaon AAON Industrials S&P MidCap 400 Deletion Vistra VST Utilities S&P SmallCap 600 Addition Marathon Digital Holdings MARA Information Technology S&P SmallCap 600 Deletion Aaon AAON Industrials

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