Since Friday was 9/1, that means options expiration will be on 9/15, so the rollover is a week prior to the options exp, hence the 9/7.
I apparently messed up my charts for Ensign on the ym. My chart for ym z6 looks nothing like ym u6...its actually gapped up 100 points. Any idea how to fix....or get the tick data I need? IB only refreshes for a few days, I need about a moths worth of data.