https://masource.org/a-summary-of-ma-fees-for-sell-side-transactions/ https://masource.org/a-summary-of-ma-fees-for-sell-side-tran... I was curious as well and

https://masource.org/a-summary-of-ma-fees-for-sell-side-transactions/ https://masource.org/a-summary-of-ma-fees-for-sell-side-tran... I was curious as well and most sources I found point to a similar structure above. Basically the more money they get, the bigger the fee, and then there is some sort of retainer to cover their costs.