Subject: Re: study on execution prices by popular brokerages
I use IBPro. I set a limit order at the mid point between the quoted bid and ask and it's usually filled immediately. I also use Vanguard. Recently I noticed that Vanguard has a wider spread on the bid/ask than IB. However, Vanguard usually beats my limit orders which are usually placed towards the one third point.

In the study I think they were placing market orders. Were they getting better than midpoint?

Aussi