Established in the 1970s, Ong & Wong Group with a branch office in Kota Kinabalu (East Malaysia) offers various types of professional services.

Ong & Wong Chartered Accountants primarily acts as auditors of financial statements for its clients, while its taxation consultancy services are provided through O & W Tax Consultants SB. Its corporate restructuring and insolvency consultancy division is placed under O & M Corporate Advisory SB while its affiliate, O & M Management Consultants SB, carries out company secretarial functions.