Quote from loufah:
Look at your statements and see which trades got made. When I was flagged as an underfunded PDT at IB, I was surprised, because I keep track of my trade count. What I didn't know was that (1) the expiration of a worthless option counted as a transaction that takes place on Friday, so any opening transactions of an option on its last trading day resulted in a day trade if it expired worthless. (2) IB told me that they didn't implement 6% exclusion ("If day-trading activities do not exceed six percent of the customerâs total trading activity for the five-day period, the clearing firm is not required to designate such accounts as pattern day traders") Since this is optional, IB was still following the rule; at the time, I had read a paraphrase of the rule rather than the actual text from the NASD.