Largest Brokerages by volume traded

[NewbyTrader]

Can anyone confirm who are the largest brokerages by share volumes traded (equities) in the US? Is this information made available by NASDAQ or NYSE? I am doing research and this information would be very useful. Thank you

 

[progix]

I hope you already had done your research, i guess both are the stock exchanges of America and in terms of capitalization NYSE is on top followed by NASDAQ.