option spreadglossary / OPTION SPREAD option spread. Securities. The difference between the option price and the market price of the underlying stock when the option is exercised. See SPREAD. 词条贡献者 双语律师William,国内知名法学院金融专业,擅长翻译各类与投资基金、投资顾问及金融衍生工具相关的法律文件。