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Hi Craig, take a look at my experience with TOS today regarding not getting filled on ULTA after Kim got filled 5c below an order I had sitting there since the open:

I run Tradier, IB and TOS all using live data. I will only trade one candidate on one specific platform, so I never have the same data pulled up on all platforms. Over the past few days I've been comparing the pricing data and noticed there are differences in price. Tradier and TOS will report the same bid/ask/mid, but IB is usually way off from those numbers. I think what we're looking at here is IB is using a very sophisticated method in their Smart Routing that gives anyone trading there a BIG edge. Screenshots from Tradier, TOS, and IB for AVGO show these price differences. These screenshots were all taken within 15 seconds of each other around 1:40 Eastern time. Given this, I'm really considering moving all of my trading back to IB. The low commission costs at Tradier do me no good if I can't even get in the trade.