1) The gap between bid and ask prices of a stock or other security. (2) The simultaneous purchase and sale of separate futures or options contracts for the same commodity for delivery in different months. Also known as a straddle. (3) Difference between the price at which an underwriter buys an issue from a firm and the price at which the underwriter sells it to the public. (4) The price an issuer pays above a benchmark fixed-income yield to borrow money