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What is the 'Option Margin' The option margin is the cash or securities an investor must deposit in his account as collateral before writing options. Margin requirements vary by option type. Margin requirements are established by the Federal Reserve Board in Regulation T; individual brokers may impose additional requirements. The cash or securities an investor must deposit in his account as collateral before writing options. Margin requirements vary by option type. Margin requirements are established by the Federal Reserve Board in Regulation T; individual brokers may impose additional requirements.
Leverage. An equity option allows investors to fix the price for a specific period of time at which an investor can purchase or sell 100 shares of an equity for a premium (price), which is only a percentage of what one would pay to own the equity outright.n uncovered option seller (sometimes referred to as the uncovered writer of an option), on the other hand, may face unlimited risk. This options trading guide provides an overview of characteristics of equity options and how these investments work in the following segments: 1  Defining Options.