(not a trader but I've researched it a bit) Yes, often per share traded. A lot of traders use Interactive Brokers which has a few different pricing structures[1

(not a trader but I've researched it a bit) Yes, often per share traded. A lot of traders use Interactive Brokers which has a few different pricing structures[1]. [1]: http://www.interactivebrokers.com/en/p.php?f=commission http://www.interactivebrokers.com/en/p.php?f=commission