Vistra files 424B7: prospectus (424B)

PROSPECTUS SUPPLEMENT (To Prospectus dated September 8, 2026)

5,000,000 Shares Vistra Corp.

Common Stock

This prospectus supplement and the accompanying base prospectus relate to the proposed resale from time to time of up to 5,000,000 shares of our common stock, par value $0.01 per share (our “common stock”), by the selling stockholder named in this prospectus supplement. The selling stockholder identified in this prospectus supplement may offer and sell or otherwise dispose of its shares of our common stock covered by this prospectus supplement from time to time through public or private transactions at fixed prices, at prevailing market prices at the time of sale, at prices related to the prevailing market price, at varying prices determined at the time of sale or at negotiated prices. See “Plan of Distribution” for more information about how the selling stockholder identified in this prospectus supplement may sell or dispose of its shares of our common stock covered by this prospectus supplement. We will not receive any proceeds from the sale of the shares by the selling stockholder.

Our common stock is listed on the New York Stock Exchange and the NYSE Texas under the symbol “VST.” On November 6, 2026, the last reported sale price of our common stock on the New York Stock Exchange was $124.80 per share.

Investing in our common stock involves risks. See “Risk Factors” beginning on page S- 2 of this prospectus supplement and beginning on page 3 of the accompanying base prospectus.