Live feed18:52:18·727dNEWSReleasevia QuantisnowS&P Dow Jones Indices Says Vistra Corp. Will Replace Pioneer Natural Resources Co. In The S&P 500 Effective Prior To The Market Open On May 8ByQuantisnow·Wall Street's wire, on your screen.PXD· Pioneer Natural Resources CompanyVST· Vistra Corp.EnergyUtilities