In addition, he served as Chairman of the Development Bank of Singapore (DBS) (1970–1979, 1985–1990), Great Eastern Life Assurance (1992–2000) and The Straits Holding Company (1992–2007).
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Impatient with nothing to do following his retirement, for about four and a half years from 1981 Choor Singh acted as a personal consultant for Tan Chin Tuan, the Chairman of the Oversea-Chinese Banking Corporation (OCBC), and other companies in the OCBC group such as Great Eastern Life and Overseas Assurance Corporation.