Dr Ho has been Chairman and Managing Director since 1983. He handed over the CEO portfolio to Mr Ho Chee Hon in May 2015 and remains Executive Chairman of the Group. Apart from masterminding the Group's corporate policy, enterprise direction and business planning, he also oversees R&D in AP Oil. Dr Ho is also Chairman of AP Saigon Petro Joint Stock Co Ltd, AP Oil Singapore (Shanghai) and AP Oil Singapore (Chongqing).

He holds a B. A. (1st Class Hons) Degree from Nanyang University, a PhD degree from the University of Hull, England and a diploma in Management Studies from Graduate School of Business, University of Chicago. Before joining the company in 1981, as a scholar he was bonded by Singapore Government to serve in the Public Utilities Board for 5 years and left as a Senior Hydrologist.

As an active participant in community services and charitable activities for more than four decades, Dr Ho had been on the management boards of Anglican High School, The Chinese High School, Hwa Chong Institution and Hwa Chong International School. He has also served as President of St John Brigade (Zone 2), Director and Honorary Chairman of Sian Chay Medical Institution, Chairman of Asian Lubricants Industry Association (ALIA) as well as Honorary Consul of the Republic of Djibouti in Singapore.

Mr Chang was appointed to the Board of AP Oil in 2004. He is Managing Director of the Group's wholly owned subsidiary, A.I.M. Chemical Industries Pte Ltd. He plays a leading role in business development, sales, finance, production, and general administration for the subsidiary.

He holds a Masters Degree in Business Administration (MBA) from Brunel University, U.K. and is an Associate Member of Chartered Secretaries, Australia.

Mr Mah was appointed as an Independent Director on 4 January 2021. He is currently the Managing Director of RHT Capital Pte. Ltd.. He has had many years of transactional and management experience in corporate finance projects with several financial institutions and boutique advisory firms. He has played a key role in advising companies from many industries and countries on a wide range of transactions relating to both equity capital markets, and mergers and acquisitions.

He is currently an Independent Director of Clearbridge Health Limited. His past directorships include Katrina Group Ltd. and 800 Super Holdings Limited.

Mr Mah graduated with a Bachelor of Accountancy with honours from Nanyang Business School, and a Master of Business Administration from The University of Chicago Booth School of Business. He is a Chartered Accountant (Singapore) and a Chartered Financial Analyst.

Mr Wan was appointed Independent Director on 4 January 2021. He is currently the Managing Director, Investment, APAC of Singtel Innov8 Private Ltd, with venture capital, private equity and operational experience, in corporate finance and restructuring projects.

Currently, an Independent Director of Tat Hong Equipment Service Co. and Nanofilm Technologies International Limited. He graduated from National University of Singapore with Bachelor of Business Administration (Honours).