NuScale Power Corporation (NYSE: SMR) saw its stock price plummet 5.25% in after-hours trading on Friday, following a report of insider selling. The sharp decline came after the company's Chief Executive Officer and Director, John Lawrence Hopkins, disclosed a disposal of common shares.

According to a filing with the U.S. Securities and Exchange Commission (SEC), Hopkins reported the sale of an undisclosed number of NuScale Power shares. Insider transactions, especially those involving high-ranking executives, are closely monitored by investors as they can provide insights into the company's internal perspective on its financial health and future prospects.

While the exact reasons for Hopkins' share disposal were not immediately clear, such moves by company insiders often raise concerns among investors. The after-hours stock price reaction suggests that the market interpreted this insider selling as a potentially negative signal, leading to a sell-off. As trading resumes in the next session, investors will be watching closely to see if this downward trend continues or if the stock manages to recover from this after-hours plunge.