| 1981 | Orient Bio Tech Pte Ltd
199001664G | Active |
| 1982 | Optimus Consulting Pte. Ltd.
201109415Z | Active |
| 1983 | Overseas Education Consultancy Pte Ltd
199002700W | Active |
| 1984 | Orix Aircraft Corporation
T11UF0900G | Active |
| 1985 | Ong Eng Siang Trading
37213700L | Active |
| 1986 | Orient Hero (asia) Limited
T11UF4837L | Active |
| 1987 | Ooffle Pte. Ltd.
200513033N | Active |
| 1988 | Oocl Logistics (singapore) Pte. Limited
199001029D | Active |
| 1989 | Orient Tainers Pte Ltd
199005103M | Active |
| 1990 | Options Publications Pte Ltd
199005281G | Active |
| 1991 | Orchard Medical Clinic Pte. Ltd.
200701433H | Active |
| 1992 | One Earth Holdings Pte. Ltd.
200810989R | Active |
| 1993 | Onesta Consultancy & Management Service
53316649K | Active |
| 1994 | Overseas Connect Pte. Ltd.
200809842D | Active |
| 1995 | Oasis Commodities Pte. Ltd.
201532237M | Active |
| 1996 | Og Global Venture Pte. Ltd.
201532069D | Active |
| 1997 | One Junction Private Limited
200413734D | Active |
| 1998 | One Gym Global
53294455X | Active |
| 1999 | Omm Engineering
53264793M | Active |
| 2000 | Optimal Solution Pte. Ltd.
201430217K | Active |
| 2001 | One Voucher Resources Pte. Ltd.
201221111C | Active |
| 2002 | Olive Tree International Search
53055001J | Active |
| 2003 | Oriental Maya (s'pore) Pte. Ltd.
201026513R | Active |
| 2004 | Ong & Wang Pte. Ltd.
200811736G | Active |
| 2005 | Oz Retro Pty Ltd
T15UF3724A | Active |
| 2006 | One Offshore Pte. Ltd.
200811164R | Active |
| 2007 | Oppoin Pte. Ltd.
200809164H | Active |
| 2008 | Opentrolley Pte. Ltd.
200809204G | Active |
| 2009 | Opes Capital Partners Pte. Ltd.
201532352W | Active |
| 2010 | Ocean Trading & Management Pte. Ltd.
201531986K | Active |