According to the Suez Canal Authority, Nasser did pay off 800,000 shares of the canal. I'm not 100% sure this is accurate as I cannot find the source they cited. Would anyone have a corroborating source to verify the claim of the Egyptian government that during the nationalization, Nasser paid off all shareholders?
From a The Guardian article at the time
"Britain is the largest single shareholder in the Suez Canal company, owning seven-sixteenths of the total. The company’s 99-year concession was due to expire in thirteen years, after which the canal would have reverted to Egypt. President Nasser said shareholders would be paid in accordance with the last closing prices on the Paris bourse."
https://www.theguardian.com/world/2021/jul/27/egypt-nationalises-suez-canal-nasser-1956