(1) Options trading: simultaneous purchase and sale of options of the same class with different strike prices and/or different maturities.

(2) Difference between bid and ask price.

(3) Difference between interest rates or yields for the same maturity in different currencies.

(4) Also: margin. Price difference between purchase and sale price or between the bid and ask price for securities, banknotes etc. The price difference between the bearer and registered shares of a company or the different interest rates on bonds is also termed spread.