thinkorswim, Inc. is a privately held company founded in 1999 to give self-directed option traders the tools they had dreamed of but didn't expect to actually find. We're committed to great fills, fast executions, keeping commissions low and the software free. Appropriately located at ground-zero of derivatives trading, Chicago, IL, thinkorswim encompasses retail stock, option and futures brokerage, institutional and high-net worth asset management, RED Option Advisory, and Liquid professional trading platform. thinkorswim is built to handle our clients' most strenuous demands. We recognize the complexity of option trading, and the company is staffed with option industry veterans to answer the most challenging questions and solve the most difficult problems. We review and update our technology continuously to offer clients the fastest, most seamless order routing, trade analysis, and position monitoring available. If you're looking to start trading options like a professional, welcome aboard. We're ready for you. Thinkorswim can not follow our gapping rule for autotrading account. The gaps do not happen more than 1% - 2% of the time and does not effect your performance.