Neste Shipping said it will transfer ship management functions to OSM this spring.
OSM will set up a subsidiary in Finland responsible for crewing and maintenance.
It will take on Neste's 300 crew and 17 shore workers.
Chartering functions will be retained by Neste.
"Norwegian-based OSM was chosen after a careful review of a number of possible partners," said Arvo Ruotsalainen, Neste Shipping's managing director.
"OSM's
