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.