He became heavily involved in business and finance, becoming managing director for Dalgety & Co. in 1901; chairman of directors of Millars Karri and Jarrah Co.; chairman of Bovril Australian Estates; director of the Bank of New South Wales; director of Commercial Union Insurance; and director of the WA Bank.
In the late 1890s part of it was purchased by a syndicate of Edward Wittenoom, a politician and pastoralist; James Hicks and C. L. W. Clifton.
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His brother was Sir Edward Charles (Horne) Wittenoom, a member of the Western Australian Legislative Council for thirty four years.