NuScale Power Corporation (NYSE: SMR) experienced a significant 24-hour plunge of 8.18% during Thursday's trading session. The sharp decline followed the release of the company's fourth quarter and full year 2025 financial results.

The company reported a full-year revenue decline to $31.5 million, down from $37.0 million in the prior year. Investors were particularly alarmed by a dramatic sevenfold increase in general and administrative expenses, which soared to $609.8 million for the year. This surge included a $507.4 million milestone payment related to its partnership with ENTRA1 Energy, contributing to a substantial net loss of $664.5 million for fiscal 2025.

Adding to investor concerns, NuScale Power is facing a securities class action lawsuit alleging misleading statements and omissions about the experience and capabilities of its partner ENTRA1 Energy. The combination of weaker-than-expected financial performance, soaring costs, and ongoing legal challenges prompted the severe sell-off.