X0306 4 2021-02-25 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 2021-02-25 4 F 0 2331 22.76 D 83282 D Common Stock 2021-02-26 4 F 0 1834 17.25 D 81448 D Common Stock 2021-02-26 4 A 0 65473 0.00 A 146921 D Common Stock 2021-02-26 4 A 0 33147 0.00 A 180068 D 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. In connection with the annual grant of equity awards, the grant of the reported restricted stock units to the Reporting Person was approved by Issuer's Social Responsibility and Compensation Committee (the "Compensation Committee") of Board of Directors (the "Board") on February 22, 2021. The transaction date reflects the date on which the awards became effective in the Issuer's third-party vendor's system. Represents performance-based restricted stock units for which the applicable performance criteria for the three-year period ended December 31, 2020 was certified by the Compensation Committee of the Board as of February 26, 2021. /s/ Yuki Whitmire, as Attorney-in-Fact 2021-03-01