Currently I am researching and drafting up documents for a CTA. I am looking on advice for brokerages. I use transact currently for my prop account and haven't had any problems. Although my trades are not high frequency, my holding time can be very short term depending on market speed (few seconds). Seeing as I will obviously be trading a larger amount of contracts for multiple accounts, fills and execution will play more of a factor. I have seen youtube videos of transact vs zenfire and transact obviously lags a bit. I am looking for insight from any CTA's out there. What broker/platform do you use? Do they offer a single DOM for all accounts? I will use this thread for further questions as I know I will have more.