Thanks, I would need to look further into their definitions. 99% of shares executed at market quotes or better sounds very hyped and can mean all sorts of things. Do they mean with "market quotes" the arrival price at the matching engine of the exchange or the market quotes seen on a trader's screen when they hit the submit button? Because the latter is how IB defines it. They can precisely measure it because all IBPro orders go through TWS/Gateway which locally sits on the trader's machine and hence at order submission IB knows exactly which prices were shown on the screen.
I don't know if this helps or not:
View attachment 211453
Here's another link:
https://tinyurl.com/y6crdc2t
