VST: Other company developments

Item 8.01 Other Events. On November 9, 2026, Vistra Corp. filed a prospectus supplement to its automatic shelf registration statement on Form S-3 (Registration No. 333-298811) with the Securities and Exchange Commission. This Current Report on Form 8-K is being filed solely for the purpose of filing the opinion of Latham & Watkins LLP relating to the legality of the issuance and sale of the securities set forth in the prospectus supplement, which opinion is attached as Exhibit 5.1 hereto. Item 9.01. Financial Statements and Exhibits. Exhibit No. Description 5.1 Opinion of Latham & Watkins LLP. 23.1 Consent of Latham & Watkins LLP (contained in the opinion filed as Exhibit 5.1 hereto). 104 The cover page from this Current Report on Form 8-K, formatted in Inline XBRL. 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Dated: November 9, 2026 VISTRA CORP. By: /s/ Kristopher E. Moldovan Name: Kristopher E. Moldovan Title: Executive Vice President and Chief Financial Officer