FIXT.1.1 (Always unencrypted, must be first field in message)

(Always unencrypted, must be second field in message)

(Always unencrypted, must be third field in message)

Indicates application version using a service pack identifier. The ApplVerID applies to a specific message occurrence.

Used to support bilaterally agreed custom functionality

(Always unencrypted)

(Always unencrypted)

Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)

Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)

(Can be embedded within encrypted data section.)

(Can be embedded within encrypted data section.)

Sender's LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)

"ADMIN" reserved for administrative messages not intended for a specific user. (Can be embedded within encrypted data section.)

Trading partner LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)

Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)

Trading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)

Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)

Trading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)

Always required for retransmitted messages, whether prompted by the sending system or as the result of a resend request. (Can be embedded within encrypted data section.)

Required when message may be duplicate of another message sent under a different sequence number. (Can be embedded within encrypted data section.)

(Can be embedded within encrypted data section.)

Required for message resent as a result of a ResendRequest. If data is not available set to same value as SendingTime (Can be embedded within encrypted data section.)

Required when specifying XmlData to identify the length of a XmlData message block. (Can be embedded within encrypted data section.)

Can contain a XML formatted message block (e.g. FIXML). Always immediately follows XmlDataLen field. (Can be embedded within encrypted data section.) See Volume 1: FIXML Support

Type of message encoding (non-ASCII characters) used in a message's "Encoded" fields. Required if any "Encoding" fields are used.

The last MsgSeqNum value received by the FIX engine and processed by downstream application, such as trading system or order routing system. Can be specified on every message sent. Useful for detecting a backlog with a counterparty.

Number of repeating groups of historical "hop" information. Only applicable if OnBehalfOfCompID is used, however, its use is optional. Note that some market regulations or counterparties may require tracking of message hops.

Identifies the application with which a message is associated. Used only if application sequencing is in effect.

Application sequence number assigned to the message by the application generating the message. Used only if application sequencing is in effect. Conditionally required if ApplID has been specified.

The previous sequence number in the application sequence stream. Permits an application to publish messages with sequence gaps where it cannot be avoided. Used only if application sequencing is in effect. Conditionally required if ApplID has been specified

Used to indicate that a message is being sent in response to an Application Message Request. Used only if application sequencing is in effect. It is possible for both ApplResendFlag and PossDupFlag to be set on the same message if the Sender's cache size is greater than zero and the message is being resent due to a session level resend request.

Number of entries following.

Required if any RoutingType and RoutingIDs are specified. Indicates the number within repeating group.

(Always unencrypted, always last field in message)