Enter your trade into the app and presto, you own the stock without any commissions or trade fees. Many market exchanges examples include Citadel , Bats , and KCG Virtu will pay your broker for routing your order to them. After the dot-com market crash , the SEC and FINRA decided that previous day trading rules did not properly address the inherent risks with day trading. FINRA rules define a day trade as, «The purchase and sale, or the sale and purchase, of the same security on the same day in a margin account. Certain complex options strategies carry additional risk. This is great for kids, teens and family portfolios where you can make investing a family activity.