| OC | OC (2011) LIMITED | OC VIADUCT LIMITED |
| OCA | OCAC LIMITED | OCASOR LIMITED |
| OCB | OCB FORESTRY LIMITED | OCB FORESTRY LIMITED |
| OCC | OCCAM CONSULTING LIMITED | OCCUPATIONAL THERAPY SERVICES (WANGANUI) LIMITED |
| OCD | OCD COUNSELLING LIMITED | OCD COUNSELLING LIMITED |
| OCE | OCEAN 1 EXPEDITIONS NEW ZEALAND LIMITED | OCEL CONSULTANTS NZ LIMITED |
| OCF | OCF LIMITED | OCF LIMITED |
| OCG | OCG CONSULTING LIMITED | OCG CONSULTING LIMITED |
| OCH | OCHA CONSULTING LIMITED | OCHRE RECRUITMENT LIMITED |
| OCI | OCI COMMUNICATION LIMITED | OCIS (NEW ZEALAND) LIMITED |
| OCJ | OCJ HOLDINGS LIMITED | OCJ TRUSTEE LIMITED |
| OCK | OCK CONSULTING LIMITED | OCKY HOLDINGS LIMITED |
| OCL | OCLAIN PROPERTIES LIMITED | OCL LIMITED |
| OCM | OCMF SURGICAL SUPPLIES LIMITED | OCMS JOINT VENTURE PROPERTIES LIMITED |
| OCN | OCNZ LIMITED | OCNZ VENTURE LIMITED |
| OCO | OCO (2004) LIMITED | OCOTAL LIMITED |
| OCP | OCP LIMITED | OCP LIMITED |
| OCR | OCRE RESOURCES LIMITED | OCR INTERNATIONAL LIMITED |
| OCS | OCSA NEW ZEALAND LIMITED | OCS LIMITED |
| OCT | OCTA ASSOCIATES LIMITED | OCTUPUS HOLDINGS LIMITED |
| OCU | OCULA INVESTMENTS LIMITED | OCULUS LIMITED |
| OCW | OCW 2011 LIMITED | OCW LIMITED |