X0306 4 2022-02-25 0 0001692819 Vistra Corp. VST 0001728921 MUSCATO STEPHEN J 6555 SIERRA DRIVE IRVING TX 75039 0 1 0 0 EVP & Chief Commercial Officer Common Stock 2022-02-25 4 F 0 9745 21.90 D 182901 D Common Stock 2022-02-25 4 F 0 2964 21.90 D 179937 D Common Stock 2022-02-25 4 F 0 3596 21.90 D 176341 D Common Stock 2022-03-01 4 S 0 50000 22.3883 D 126341 D This transaction represents the withholding by the Issuer of shares to pay taxes in connection with the vesting of performance stock units. The timing and amount of the transaction were determined by the terms of the applicable performance stock unit award and were not within the control of the Reporting Person. This transaction represents the withholding by the Issuer of shares to pay taxes in connection with the vesting of restricted stock units. The timing and amount of the transaction were determined by the terms of the applicable restricted stock unit award and were not within the control of the Reporting Person. Represents a weighted-average price. These shares were sold in multiple transactions at prices ranging from $22.11 to $22.72, inclusive. For all transactions reported in this Form 4 utilizing a weighted-average price, the Reporting Person will provide to the Issuer, any security holder of the Issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. /s/ Yuki Whitmire, as Attorney-in-Fact 2022-03-01