It is rare to find a firm that will allow a trader to solely trade s&p futures for a few reasons. 1, being that it is one of the riskiest financial products to trade in terms of volatility & if not done right it is quick to get stuck in a hole with a proportionate amount of losses. If a firm does take on the risk, profit splits is usually 50% on futures trading. 2. Y would a trader want to go to a prop firm to trade futures if margins are very low, at some places $500/contract with a minimal of $2,500 to start an acct. And u dont have to split 50% in profits with a firm. As many traders learning curves are significant and very steep, it is best to trade on a real-time demo account that is insync with the market. U can find one at mirusfutures.com good luck to all!