What is the minimum maintenance margin for a stock?

Maintenance Margin is the amount of funds which must be maintained in order to continue holding a position. In the U.S., the rules of the listing exchanges specify the maintenance margin requirements on security transactions subject to SEC approval. The exchange minimum maintenance margin requirement for long stock positions is currently set at 25% although brokers can add any amount of a 'house margin' requirement in excess of that, particularly where the security is considered low-priced or subject to volatile price changes. The exchange minimum maintenance margin requirement for short stock positions is currently set at 30%. You can monitor your margin values in real time using your TWS/Mosaic Account Window. …

Market appreciation does add credit to a Reg T account's SMA. At the end of the regular trading day (normally 15:50 US/Eastern), there is a check for the amount of the Reg T Excess (Reg T Excess equals Reg T Equity less Reg T Margin). If the Reg T Excess of a margin account is greater than the previous end of day Reg T Excess then the account receives a credit and SMA and is set equal to the new amount of Reg T Excess. The change to SMA resulting from trades is effectively the change in Reg T Equity minus the change in Reg T Margin…

This is the minimum portion of a new security purchase that an investor must pay for in cash. For U.S. stocks, this is defined by Reg. T and is currently 50% (Reg. T Initial Margin). Since IBKR calculates margin on a real-time basis and Reg. T is enforced at the end of the day, IBKR performs an initial margin requirement check at the point of trade, albeit at a rate generally less than 50% (IB Initial Margin). …

When trading in a Reg-T account at Interactive Brokers (IBKR), it is important to be aware of several key constraints that are designed to manage risk and ensure regulatory compliance. These constraints include:

1. Regulation T (Reg-T) Compliance:…