I thought the ES trading was halted during 4:15 to 5:00 PM EST, but I can still see the ticks moving and the bid and ask size, why is that?
ES is only halted for 15 minutes from 4:15 to 4:30 PM EST/EDT. It is then halted again from 5:15 to 6:00 PM EST/EDT. Read the contract info at the CME Group website.