Colleen Sim obtained her London Chamber of Commerce and Industry Higher Group Diploma in Accounting in July 1993 and completed her professional qualification with the Association of Chartered Certified Accountants in February 1999. Since June 1999, she has been a member of the Association of Chartered Certified Accountants, and she joined the Malaysian Institute of Accountants in July 2000, becoming a Fellow Member of the Association of Chartered Certified Accountants in July 2004.

With over 27 years of experience in accounting, finance, and external audit, she has held various positions across numerous companies, showcasing her expertise in these fields. In September 2002, she began her career at Mega Fortris as an accountant, demonstrating her capability and dedication to the company. Her skills and leadership were recognized through her promotions, first to group accountant in May 2012 and then to chief finance officer in January 2022. In January 2023, she was re-designated as the Group Chief Finance Officer, a role in which she is primarily responsible for managing the Group’s accounting, financial, and treasury functions. This includes overseeing financial planning and review, managing cash flow, and ensuring accurate financial reporting, contributing significantly to the strategic financial health and governance of Mega Fortris.