Some of the stocks (typically penny) I trade are illiquid. If I put a GTC order, I can get partial executions for several days. Most firms then charge you a minimum commission for each day of partial execution and that can add up to a substantial amount relative to the dollar value of your trade. Is there a broker that will charge a flat fee for a GTC order and will not charge more for each subsequent day of partial execution? For those who trade penny stocks and have to deal with illiquid ones, any broker that you recommend? Thanks.