After the creation of the company there was gradual development including buying more equipment and increased employment.

In 1967, due to the blockade of the Suez Canal, PLO ships, performing cruises to the Far East, were forced to circumnavigate Africa.

In the 1970s tonnage increased further, and at the end of the decade was about 1,200,000 DWT with 176 ships bearing the mark Armatorski PLO.

It deals with, among others, maintaining the scheduled tonnage for conventional and RORO vessels in the Baltic, the North Sea and the Mediterranean.

Other PLO companies duties include the organization of supply vessels and the recruitment of crews.