Standard Supply has sold its four remaining platform supply vessels as principal Oystein Stray Spetalen cashes in on a spectacular offshore shipping bet.

The midsize PSVs have gone en bloc to an unnamed buyer for $34m, giving the Oslo-listed owner a profit of more than $13m.

The ships were bought during the offshore slump in 2016 and 2017, but now PSVs are sought after in much-improved markets due to a lack of newbuildings for the past decade.