Hambro had been at Money Portal since its launch and was chairman until February when he became non-executive director due to his illness.
His career also included executive posts at Hambros Bank in London, New York, South Africa and Italy.
He became a director of Hambros Bank and was president of Hambro America Inc.
He left Hambros Bank to found J O Hambro Investment Management Limited, an asset management company, as a subsidiary of Credit Suisse Private Banking.
He was a director of several public and private companies in the UK and overseas including the Mercantile Investment Trust and held other prominent roles including chairman of Colon Cancer Concern, the Joint British Cancer Charities and the South African Business Initiative.
He was also deputy president of Macmillan Cancer Relief and a Governor of The London Clinic.
A spokesman for Money Portal says: “Richard was a wonderful man and has been with the company since its inception. He has made a significant contribution to the firm and will be sorely missed. The company sends its condolences to his family.”