Associated British (AB) Ports and other rivals are "hopeful" of future growth, despite facing higher insurance costs as they deal with an increased terrorist threat.
AB Ports was reported to have suffered a rise of £3.1m in its insurance costs last year and it claimed further security-related talks might push costs higher still.
However chief executive Bo Lerenius said that despite this he was "cautiously optimistic" that the company would post future growth.
