Under his leadership, the company, which was involved in import and export, cigarette distribution, retail petrol, shop rental, and Bong Pang Cinema management, flourished.

[9] Ong's commitment to education began in the 1950s, particularly through his support for CHMS and the establishment of SAS in Brunei Town, present-day Bandar Seri Begawan.

[11] He wrote to the state marine officer on 29 Oct 1966, about Brunei Town Wharf's congestion and the recommendation that a government-sponsored port user committee be established.

[9] In addition to his educational efforts, Ong was deeply committed to advancing the Chinese community and fostering trade in Brunei.

He held significant long-term roles on the board of the CCC in Bandar Seri Begawan, where he played a key part in improving trade relations between Brunei and other countries, while also elevating the profile of Chinese merchants internationally.

As an entrepreneur and leader, he was asked to chair the Chinese Community Committee for the sultan's birthday celebrations in 1996 and 1997, overseeing the organisation and coordination of the events.

[14] A book was a biography published posthumously in 2004, commemorating his life and contributions, named Ong Kim Kee: In loving memory.