A trade practice in which a floor broker in the process of executing an order fills part of the order at one price and the remainder of the order at another price. This tactic is done in order to avoid exchangesÂ’ rules against trading at fractional increments, or split-tick trading. Essentially, ginzy trading is the unethical practice of quoting different prices to customers on the same buy and sell order. Regulators have rules that this is a noncompetitive trading practice and violates the Commodity Exchange Act.