Identifier for the Derivative Security List message

Result of the Security Request identified by SecurityReqID

Updates can be applied to Underlying or option class. If Series information provided, then Series has explicitly changed

Underlying security for which derivatives are being returned

Group block which contains all information for an option family. If provided DerivativeSecurityDefinition qualifies the strikes specified in the Instrument block. DerivativeSecurityDefinition contains the following components: DerivativeInstrument. DerivativeInstrumentExtension, MarketSegmentGrp

Represents the time at which a security was last updated

Used to indicate the total number of securities being returned for this request. Used in the event that message fragmentation is required

Indicates whether this is the last fragment in a sequence of message fragments. Only required where message has been fragmented