margin deficiencyglossary / MARGIN DEFICIENCY margin deficiency. Securities. The extent to which the amount of the required margin exceeds the equity in a margin account. [Cases: Securities Regulation 45.11.] 词条贡献者 译者Wendy,欧洲知名商学院国际金融专业,擅长翻译各种与私募基金相关的法律文件。