SEC Rule 606
Under SEC Rule 606(a), broker-dealers that route equity and option orders on behalf of customers are required to prepare quarterly reports that disclose specific information about their order routing practices for non-directed orders in NMS stocks and option contracts in NMS securities. A non-directed order would be any order that the customer has not specifically instructed that the order to be routed to a particular venue for execution. The reports are made available to the public for free for each calendar quarter.