| A | agency single order |
| B | short exempt transaction refer to a type |
| C | program order non index arb for member firm |
| D | program order index arb for member firm |
| E | short exempt transaction for principal |
| F | short exempt transaction refer to w type |
| H | short exempt transaction refer to i type |
| I | individual investor |
| J | program order index arb for individual customer |
| K | program order non index arb for individual customer |
| L | short exempt affiliated |
| M | program order index arb for other member |
| N | program order non index arb for other member |
| O | proprietary affiliated |
| P | principal |
| R | transactions non member |
| S | specialist trades |
| T | transactions unaffiliated member |
| U | program order index arb for other agency |
| W | all other orders as agent for other member |
| X | short exempt not affiliated |
| Y | program order non index arb for other agency |
| Z | short exempt nonmember |