Vistra Energy Corp. (NYSE:VST) shares tumbled 6.90% in pre-market trading on Thursday following the release of its second-quarter 2025 financial results. The energy company reported disappointing figures that fell short of analyst expectations, triggering a sell-off among investors.

Vistra's quarterly revenue came in at $4.250 billion, missing the analyst consensus estimate of $4.963 billion by 14.36%. While this represents a 10.53% increase from the $3.845 billion reported in the same period last year, the significant shortfall appears to have spooked the market. Additionally, the company's adjusted EBITDA of $1.349 billion fell short of the $1.380 billion estimate, further contributing to investor concerns.

Despite the earnings miss, Vistra reported a net income of $327 million and an operating income of $515 million for the quarter. The company also reaffirmed its 2025 guidance ranges for EBITDA and FCFBG, suggesting confidence in its full-year performance. However, this reassurance seems insufficient to offset the immediate negative reaction to the quarterly results, as evidenced by the sharp pre-market decline in the stock price.