Icon Energy (ICON) shares were 21% higher pre-bell Friday, extending Thursday's rally.

NeoVolta (NEOV) stock was up 18% following a 1.4% loss in the previous session.

Oklo (OKLO) shares were 18% higher after the company said it has struck a deal with Meta Platforms (META) to develop a 1.2-gigawatt nuclear power campus in Pike County, Ohio.

Revolution Medicines (RVMD) stock was up 14%, a day after the Financial Times reported that the company is in talks to be acquired by Merck (MRK).

Vistra (VST) shares were 14% higher after the company said it has entered into 20-year power purchase deals with Meta to provide more than 2,600 megawatts of nuclear energy.