Initial margin is the minimum percentage of a purchase price that an investor must pay with their own funds when buying securities through a margin account.
Understanding initial margin
When Elephants use a margin account, they borrow money from their brokerage to purchase assets like equities or derivatives. The brokerage requires the buyer to put up a portion of the total cost upfront. This upfront payment is the initial margin. It is a deposit that protects the broker against potential losses if the value of the purchased assets declines.
The required percentage varies based on the asset class and the regulatory jurisdiction. In the United States, the Federal Reserve sets a baseline requirement of 50% for most stocks under Regulation T. Brokers operating in the US can also demand a higher percentage based on their internal risk assessments. In other regions, regulators such as the European Securities and Markets Authority or the Financial Conduct Authority in the United Kingdom enforce their own specific margin rules depending on the financial instrument being traded.
Once the trade is executed, the initial margin requirement no longer applies. The Elephant must then adhere to a maintenance margin. This is a lower equity threshold that must remain in the account to keep the position open. If the account value falls below the maintenance margin, the broker issues a margin call, requiring the account holder to deposit more cash or liquidate the position.
Example
Assume an Elephant decides to buy 1,000 shares of a publicly traded company that manufactures agricultural equipment for peanut farming. The shares are priced at $10 each, making the total trade size $10,000. If the broker requires an initial margin of 50% for this specific stock, the Elephant must deposit $5,000 of their own cash into the margin account. The broker then lends the remaining $5,000 to complete the purchase. If the stock price later drops, the broker is protected by the initial $5,000 equity buffer the Elephant provided upfront.