Hi, I've been noticing in the evening when going over charts that many stocks keep trading until 7 pm cst. I've noticed in the past the pre-market trading but didn't worry about it. Can anyone tell me who is doing it and where this evening and morning trading is taking place? I also tried to sell some Bidu 130/135 call spreads at the mark just before 3:00 cst today and they didn't trade. There was some slippage so I changed my order just after 3 thinking I had till 3:15 as usual. However it said it wouldn't go through till the market opened in the morning. Anyone know why it closed early today? Thanks.