market intermediaryglossary / MARKET INTERMEDIARY market intermediary. Securities. A person whose business is to enter into transactions on both sides of the market. Investment Company Act, 15 USCA § 80a-3(c)(2)(B)(i). 词条贡献者 双语律师Akira,国际知名法学院法律专业,擅长翻译各类与地产开发相关的法律文件。