I'm finding the limit down at 5% actually showed -4.6% overnight. The circuit breaker at -7 shows -6.6 on IB YM charts. Is it taking a mid price or something?
%% Sounds like your data is more accurate than mine. I use 3 chart services + a notebook; 2 out of the 3 were off/off today. So let the profits ride on SDOW + related[out now] . UDOW , maybe good, I cant get good quotes on that small investment. Best way I've found on that= measure all against your notebook in order not to get confused. I remember IBKR was off more than that % on volume , but consistant, so its OK