Is there an additional charge to trade during extended hours trading sessions or to trade on ECNs?

A commission surcharge of $0.003 per share is applied to orders executed on the ECN (i.e. ARCA and NSDQ). You may route orders to these destinations during market hours and extended hours trading sessions. During extended hours, pre-market orders may be placed between 7:05 – 9:30 a.m. EST and after-hours order may be entered between 4:00 – 8:00 p.m. EST.