- OCEANBULK INTERNATIONAL S.A.
- OCEANBULK MARITIME S.A.
- OIKOS MARITIME INC.
- OLYMPIA OCEAN CARRIERS LTD
- OLYMPIC SHIPPING & MANAGEMENT S.A.
- OLYMPIC VISION AND MANAGEMENT
- OMICRON SHIP MANAGEMENT INC.
- ORPHEUS MARINE TRANSPORT CORP.
OCEANBULK MARITIME S.A.
OCEANBULK INTERNATIONAL S.A.