| 1981 | Orion Engineered Carbons International Gmbh T11UF3985L | Active |
| 1982 | Oh Hup Huat Sesame Oil 37774700M | Active |
| 1983 | Orix Holdings Limited T11UF2099B | Active |
| 1984 | Oman Trading International Ltd. T11UF0684C | Active |
| 1985 | Olfi Lux Holdings Sarl T11UF5054H | Active |
| 1986 | Ovd Kinegram Ag T12UF0006C | Active |
| 1987 | Oak Unipro Solutions Pte. Ltd. 201313649W | Active |
| 1988 | Orbit Peripherals Pte Ltd 199004577G | Active |
| 1989 | Osf Transport Services 53232543E | Active |
| 1990 | On The Ball Consulting 53136115B | Active |
| 1991 | Ohana Holdings Pte. Ltd. 200201159W | Active |
| 1992 | Orchard Maharajah Restaurant Pte Ltd 199003148E | Active |
| 1993 | Orient Bio Tech Pte Ltd 199001664G | Active |
| 1994 | Optimus Consulting Pte. Ltd. 201109415Z | Active |
| 1995 | Overseas Education Consultancy Pte Ltd 199002700W | Active |
| 1996 | Orix Aircraft Corporation T11UF0900G | Active |
| 1997 | Ong Eng Siang Trading 37213700L | Active |
| 1998 | Orient Hero (asia) Limited T11UF4837L | Active |
| 1999 | Ooffle Pte. Ltd. 200513033N | Active |
| 2000 | Oocl Logistics (singapore) Pte. Limited 199001029D | Active |
| 2001 | Orient Tainers Pte Ltd 199005103M | Active |
| 2002 | Options Publications Pte Ltd 199005281G | Active |
| 2003 | Orchard Medical Clinic Pte. Ltd. 200701433H | Active |
| 2004 | One Earth Holdings Pte. Ltd. 200810989R | Active |
| 2005 | Onesta Consultancy & Management Service 53316649K | Active |
| 2006 | Overseas Connect Pte. Ltd. 200809842D | Active |
| 2007 | Oasis Commodities Pte. Ltd. 201532237M | Active |
| 2008 | Og Global Venture Pte. Ltd. 201532069D | Active |
| 2009 | One Junction Private Limited 200413734D | Active |
| 2010 | One Gym Global 53294455X | Active |