| MDSecSizeTypeCodeSet | int | Specifies the type of secondary size.
| 1 | = | Customer Quantity of retail investors. | Added EP47
Updated EP190
| | [Customer] | | 2 | = | Customer professional Quantity of high-volume investors acting similar to broker-dealers. | Added EP190
| | [CustomerProfessional] | | 3 | = | Do not trade through Quantity that cannot trade through the away markets. | Added EP190
| | [DoNotTradeThrough] |
| Added EP47
|