Interactive Brokers had this paragraph in their customer agreement: 8. Proprietary Trading - Display of Customer Orders: Subject to all laws and regulations, Customer authorizes IB to execute proprietary trades of itself and its affiliates, though IB may simultaneously hold unexecuted Customer orders for the same products at the same price. Here is the link: https://www.interactivebrokers.com/...ile=registration_1/us_customer_agreement.html Does this mean that when a customer places an order with them, and they want to put the same order, they can block the customer's order and put theirs instead ? Is this as bad as this sounds ? Also, what exactly does this mean: "Customer authorizes IB to execute proprietary trades" ? All this sounds quite scary. Don't the rules protect the customers against such things ? What are the reputable futures brokers which have a "fair" customer policy ?