In the case of margin violations, IBKR reserves the right to liquidate positions and restore margin compliance without any restriction as to the trading session. As a general practice, however, the default action is to schedule liquidation of U.S. stocks near the opening of the regular trading session.
Do forced liquidations of U.S. stocks occur outside of regular trading hours?
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How do I request an extension for a margin call?
Will IBKR delay liquidation while I deposit funds in my account?
Why is "show data outside of regular trading hours" greyed out in my TWS chart?
Is an account that is non-margin compliant subject to liquidation if the liquidation creates a PDT violation?