Denham began his career in stockbroking before moving into corporate planning for a major international insurance broker. He is a director of many years' standing of both public and private companies involved in the financial services, property, mining, leisure and manufacturing sectors. On the Isle of Man, he is Chairman of Webis Holdings PLC, Chief Executive Officer of Manx Financial Group plc, Chief Executive Officer of Speymill PLC, Finance Director of West African Minerals Limited, Finance Director of Port Erin Biopharma Investments Limited and Finance Director of Copper Development Corporation - all quoted on the London AIM market. He is also Managing Director of Burnbrae Group Limited. Denham is also currently the resident director of T1ps Investment Management (IoM) Limited.