Dato' James Lim Cheng Poh joined the Hong Leong Group Malaysia in 1983 as the Managing Director for Hong Leong Credit Berhad (now known as Hong Leong Financial Group). In January 1994, he was appointed as the Senior Group Managing Director of Hong Leong Bank. Dato' James retired from Hong Leong Bank and the Hong Leong Group in October 2003 after having served the group for 21 years. 

On 15 June 2004, he joined AmBank (M) Berhad as its Managing Director/ Chief Executive Officer. After the merger of the business operations of AmBank Berhad and AmFinance Berhad (renamed as AmBank (M) Berhad) on 1 June 2005, Dato' James was appointed as the Managing Director of the Business Banking. 

During 2005 to 2006, he was appointed as Director of AmAssurance Berhad and AmIslamic Bank Berhad. Dato' James retired from AmBank Group in October 2015.

Dato' James was an Independent Non-Executive Chairman of LYC Healthcare Berhad, a public company listed on the ACE Market of Bursa Malaysia Securities Berhad and resigned in August 2020.

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175,000 Ordinary Shares in Leon Fuat Berhad held by his spouse.