X0306 4 2019-05-01 0 0001692819 Vistra Energy Corp. VST 0001342932 SULT JOHN R 6555 SIERRA DRIVE IRVING TX 75039 1 0 0 0 Common Stock 2019-05-01 4 A 0 5504 0.00 A 42100 D Grants of restricted stock units approved by Issuer's Compensation Committee of Board of Directors on February 25, 2019. Restricted stock units grant pursuant to Rule 16b-3(d). The restricted stock units were issued in connection with the Reporting Person's director compensation, and the number of units issued was calculated based on the closing stock price of the Issuer's common stock of $27.25 on April 30, 2019. Each restricted stock unit represents a contingent right to receive one share of Vistra Energy Corp. common stock. The restricted stock units vest in full on May 1, 2020. Pursuant to the Reporting Person's election under the Vistra Energy Equity Deferred Compensation Plan for Certain Directors, the restricted stock units become payable upon the Reporting Person's separation of service as a director. /s/ John R. Sult 2019-05-03