>Does anyone know of a trading platform where I can log into 3 separate accounts and execute >trades to all 3 accounts?
http://www.motivewave.com/
You can enable multiple broker accounts by creating different workspaces.
But there are separate interfaces.
> Ideally, I want to hit BUY 2 ES @ Market -- and have that trade execute to all 3 of my brokers.
I don't think there is an existing platform which one order execute to multiple brokers, unless you do some API programming using python etc.
Very nice. I guess that might be the closest thing... Cheers!