Initial margin requirement on short stock (minimum of 50 % of the short stock market value plus sale proceeds, please see above for short stock requirements). (ally.com)
They can also walk you through initial margin requirements for your brokerage account and a whole load more. (daytrading.com)
Once you accept the terms, you must meet the minimum margin requirement of $ 2,000 or the broker's requirements. (creditdonkey.com)