Vistra Energy Corp. (VST) shares tumbled 5.39% in pre-market trading on Wednesday following the release of its disappointing first-quarter 2025 financial results. The energy company reported a significant net loss and missed revenue expectations, overshadowing some positive aspects of its performance.

Vistra swung to a net loss of $268 million in Q1 2025, a stark contrast to the $18 million net income reported in the same period last year. The company's revenue for the quarter came in at $3.93 billion, falling short of analysts' expectations of $4.07 billion. Adding to the gloomy picture, Vistra reported an operating loss of $120 million and a pretax loss of $444 million for the quarter.

Despite the overall negative results, there were some bright spots in Vistra's report. The company's adjusted EBITDA of $1,240 million significantly outperformed the estimate of $1,031 million. Additionally, Vistra reaffirmed its 2025 guidance, suggesting management's confidence in the company's future performance. However, these positive factors were not enough to offset investors' concerns about the substantial losses and revenue miss, leading to the sharp pre-market decline in Vistra's stock price.