Shares in the recently listed PSV pure play operator increased $2.20 on Monday to end the day at $18.76 each.

The large spike came as NAO’s second largest shareholder said it had increased its stake in the company to over 20%.

News of the Leon Cooperman-controlled Omega fund’s increased stake came in a disclosure to US regulators on Monday.

Monday also saw NAO firm up newbuilding orders for two PSVs at Fincantieri-owned shipbuilder Vard.

Each