Vistra Energy Corp. (VST) experienced a pre-market plunge of 5.20% on Thursday, following the release of its fourth-quarter and full-year 2025 financial results.

The sharp decline appears driven by key metrics that fell short of market expectations. The company reported quarterly sales of $4.584 billion, which missed the analyst consensus estimate of $5.789 billion by a significant 20.81 percent. Furthermore, Vistra's Q4 net income was $233 million, a substantial decline from the $490 million reported for the same period a year earlier.

While the company's Q4 adjusted EBITDA of $1,742 million did beat the IBES estimate of $1,686 million, the market's focus remained on the disappointing top-line performance and the year-over-year drop in profitability, leading to the pre-market sell-off.