Orders are routed by IBKR directly to one or more execution venues, including multiple exchanges, dark pools, and IBKR’s own alternative trading system (ATS).
IBKR BestX's suite of choices offers clients a powerful solution for helping to achieve best execution and price improvement across their trading activities by combining (depending on the product being traded) the IBUSOPT destination, the IBKR ATS, advanced order types, and IB SmartRoutingSM.
For US listed equity options and certain index options, the IBUSOPT destination is designed to offer clients the opportunity to interact with IB SmartRouted marketable order flow and have their orders filled in between the National Best Bid/Offer (NBBO). Clients can buy between the bid and the midpoint or sell between the offer and the midpoint without revealing their trading interests to the market or being subject to adverse selection by market-moving orders (as they would be if their order were displayed on an exchange).
For US listed stocks and ETFs, the IBKR ATS allows IBKR Pro clients to choose to interact solely with IB SmartRouted order flow and access order flows that may not be available at exchanges. This helps to provide price improvement (by resting passive orders rather than crossing the spread) on large volume and block orders while minimizing market impact.
For IBKR Pro clients, IB SmartRoutingSM helps support best execution by continuously searching for the best available prices for stocks, options, and combinations across exchanges and dark pools. This technology dynamically re-routes all or part of clients' orders to achieve immediate electronic execution, while factoring in transaction costs, fees, rebates, and other factors that impact trade execution.
Both IBUSOPT and IBKR ATS offer Pegged-to-Midpoint and Pegged-to-Best order types, and the IBKR ATS also offers a Reroute to SMART order type.