Castor Maritime has spent just over $40m to acquire panamax bulkers as its relentless spending spree in the secondhand market shows little sign of slowing down.

The Petros Panagiotidis-led company said it paid $19.06m for a bulker built in Japan in 2013, and it paid $21m for a vessel built in South Korea in 2014.

The identities of the sellers and vessels were not disclosed.