If you open a four-leg spread and close it on the same day. Some brokers count as 1 day-trade, and some as 4 day-trade. Why? I thought the rule is from the exchange authority, not from the individual brokers.
When you enter a spread order, it goes out as one order. When executed, it is a number of single legs after. Closing any leg that day counts as a day trade. Closing a 4 legged spread would be 4 day trades.