Vistra(VST) - 2018 Q4 - Annual Report

FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2018 — OR — o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 001-38086 Vistra Energy Corp. (Exact name of registrant as specified in its charter) Delaware 36-4833255 (State or other jurisdiction of incorporation or organi ...