Is there a minimum investment amount to trade on our secondary market? iSTOX February 20, 2020 04:19 The minimum investment amount to trade on the iSTOX Exchange, our secondary market, is S$100. Related articles What are trading hours for the iSTOX exchange? What is the difference between market & limit orders on the iSTOX Exchange? What fees does iSTOX charge investors? Do I qualify as an iSTOX investor? What is stamp duty? How will I be charged?