Vistra Set to Join S&P 500; Aaon to Join S&P MidCap 400; Marathon Digital Holdings to Join S&P SmallCap 600

NEW YORK, May 3, 2024 /PRNewswire/ -- 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	GICS Sector
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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SOURCE S&P Dow Jones Indices

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