Some Brokers allow you start trading E-mini futures for a 350 initial margin..However, keep in mind with such a low margin...A few ticks against you will wipe you . For The (ES),the S&P 500 e-mini, 1 tick equals $12.5 and, and there are four ticks in a point. A 7 point move against you, more than likely you will be subjected to a margin call..