Tranche Update on Vistra Corp.'s Equity Buyback Plan announced on October 12, 2021.

Vistra Corp. is an integrated retail and electric power generation company. The Company operates in six business segments: Retail, Texas, East, West, Sunset and Asset Closure. The Retail segment represents its retail sales of electricity and natural gas to residential, small business and commercial and industrial customers. The Texas and East segments are engaged in electricity generation, wholesale energy sales and purchases, commodity risk management activities, fuel production and fuel logistics management. The East segment includes operations in the PJM, ISO-NE and NYISO markets. The West segment represents results from the CAISO market, including its battery ESS projects at its Moss Landing power plant site. The Sunset segment represents generation plants with announced retirement plans. The Asset Closure segment is engaged in the decommissioning and reclamation of retired plants and mines. The Company operates in approximately 41,000 megawatts of installed generation capacity.