Say I have $50k of equity in my margin account. During the trading day: I buy $40k of stock XYZ at 9:45 I sell $40k of stock XYZ at 10:00 I buy $40k of stock ZYX at 10:15 I sell $40k of stock ZYX at 10:30 I buy $40k of stock YYY at 10:45 I sell $40k of stock YYY at 11:00 I buy $40k of stock ZZZ at 11:15 I sell $40k of stock ZZZ at 11:30 I buy $40k of stock OOO at 11:45 I sell $40k of stock OOO at 12:00 At noon, I have opened and closed a cumulative total of $200k worth of day trades (4x the amount of my equity). Is my day-trading buying power exhausted for that day? Or am I able to initiate further trades that day? Thank you for your time and response. Gilberto