which broker/firm has the lowest commission?

just broke ib's third commission tier...but far from the 4th one

which firm has lower commission with >30m shares per month?

 

Is the rate your only concern?

 

are you individual or institutional?

 

Can’t single out one, there are plenty. Any other criteria you got in mind?

 

The commission is one thing. You might also want to consider the interest rate for margins (if you going to leverage), and the reliability of the broker.

I wrote this article on Medium to share ways to find the best broker.

 

tradier has free commission with api. besides，how long is your holding period？

 

all those free brokers are just trash. all ur orders go to citadel, jump, hrt...i wanna mine hit nyse directly

 

I am using limit order waiting to be hit so it is fine with me. But I do not use those free commission broker yet because they do not have some features which I need such as relative or hidden order.

I guess you use market order most of time on liquid stocks.