1839 was a busy year for Spark – he entertained over 800 visitors at his house in Tempe, and became involved in yet more enterprises including becoming vice-president of Commercial Banking Co. of Sydney, becoming an agent of the South Australian Co. and becoming director of Australian Loan Co. Spark also extended his land dealing to the regions of Melbourne and Victoria, as well as becoming agent for some twenty-two ships. He was part owner of a number of ships himself.