Complex FLEX Instrument Definition Message
| Length | 43 | 67 bytes |
| Type | 9B | FLEX Instrument Definition |
| Time Offset | 18 D2 06 00 | 447,000 ns since last Time Message |
| CID | 43 30 30 30 31 32 | C00012 |
| Underlying | 5A 56 5A 5A 54 20 20 20 | ZVZZT |
| Complex Instrument Type | 58 20 20 20 | X = All Legs are Flex Options |
| Leg Count | 03 | 3 legs |
| Message Count | 01 | Only one message needed to define instrument |
| Message Number | 01 | Message 1 of 1 |
| Message Leg Count | 03 | 3 legs |
| Leg Symbol | 30 30 30 30 30 31 20 20 | 000001 |
| Leg Ratio | FF FF FF FF | -1 = Sell 1 |
| Leg Security Type | 58 | FLEX Option Leg |
| Leg Symbol | 30 30 30 30 30 32 20 20 | 000002 |
| Leg Ratio | FF FF FF FF | -1 = Sell 1 |
| Leg Security Type | 58 | FLEX Option Leg |
| Leg Symbol | 30 30 30 30 30 33 20 20 | 000003 |
| Leg Ratio | 02 00 00 00 | 2 = Buy 2 |
| Leg Security Type | 58 | FLEX Option Leg |