"The board considers that the costs incurred to maintain the listing of the company's shares on AIM now exceed current and potential future benefits the company could obtain from the listing," Nautilus said.
"The board looks forward to the continued support of its shareholders through its TSX listing."
Shareholders under the AIM listing will be given the option to transfer over to Toronto-listed Nautilus shares with the AIM listing to be cancelled on March 8.
Nautilus shares nosedived in November after the explorer put its Solwara-1 copper-gold project in offshore Papua New Guinea on hold by halting the construction of its innovative seafloor production equipment to preserve cash.
Commissioning of the seafloor production equipment for Solwara-1 was previously expected in late 2013.
The shares briefly recovered in recent weeks due to cash takeover announcements from an algorithmic trader which are yet to materialise.