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The standard FIX message header

Added in protocol FIX.4.0

See in: FIX.4.0, FIX.4.1, FIX.4.2, FIX.4.4, FIX.5.0, FIX.5.0SP1, FIX.5.0SP2, FIX.5.0SP2 EP240, FIXT.1.1.

Field or Component Name Description Is Required Added Is Deprecated
8 BeginString FIX.4.3 (Always unencrypted, must be first field in message) Y FIX.4.0
9 BodyLength (Always unencrypted, must be second field in message) Y FIX.4.0
35 MsgType (Always unencrypted, must be third field in message) Y FIX.4.0
49 SenderCompID (Always unencrypted) Y FIX.4.0
56 TargetCompID (Always unencrypted) Y FIX.4.0
115 OnBehalfOfCompID Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.) FIX.4.0
128 DeliverToCompID Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.) FIX.4.0
90 SecureDataLen Required to identify length of encrypted section of message. (Always unencrypted) FIX.4.0
91 SecureData Required when message body is encrypted. Always immediately follows SecureDataLen (90) field. FIX.4.0
34 MsgSeqNum (Can be embedded within encrypted data section.) Y FIX.4.0
50 SenderSubID (Can be embedded within encrypted data section.) FIX.4.0
142 SenderLocationID Sender’s LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.) FIX.4.1
57 TargetSubID “ADMIN” reserved for administrative messages not intended for a specific user. (Can be embedded within encrypted data section.) FIX.4.0
143 TargetLocationID Trading partner LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.) FIX.4.1
116 OnBehalfOfSubID Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.) FIX.4.0
144 OnBehalfOfLocationID 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.) FIX.4.1
129 DeliverToSubID Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.) FIX.4.0
145 DeliverToLocationID 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.) FIX.4.1
43 PossDupFlag 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.) FIX.4.0
97 PossResend Required when message may be duplicate of another message sent under a different sequence number. (Can be embedded within encrypted data section.) FIX.4.0
52 SendingTime (Can be embedded within encrypted data section.) Y FIX.4.0
122 OrigSendingTime 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.) FIX.4.0
212 XmlDataLen Required when specifying XmlData to identify the length of a XmlData message block. (Can be embedded within encrypted data section.) FIX.4.2
213 XmlData Can contain a XML formatted message block (e.g. FIXML). Always immediately follows XmlDataLen (212) field. (Can be embedded within encrypted data section.)
See Volume 1: “FIXML Support”		 FIX.4.2
347 MessageEncoding Type of message encoding (non-ASCII characters) used in a message’s “Encoded” fields. Required if any “Encoding” fields are used. FIX.4.2
369 LastMsgSeqNumProcessed 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. FIX.4.2
370 OnBehalfOfSendingTime (deprecated)
Used when a message is sent via a “hub” or “service bureau”. If A sends to Q (the hub) who then sends to B via a separate FIX session, then when Q sends to B the value of this field should represent the SendingTime on the message A sent to Q. (always expressed in UTC (Universal Time Coordinated, also known as “GMT”)		 FIX.4.2
627 NoHops 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. FIX.4.3
628 HopCompID Third party firm which delivered a specific message either from the firm which originated the message or from another third party (if multiple “hops” are performed). It is recommended that this value be the SenderCompID (49) of the third party. FIX.4.3
629 HopSendingTime Time that HopCompID (628) sent the message. It is recommended that this value be the SendingTime (52) of the message sent by the third party. FIX.4.3
630 HopRefID Reference identifier assigned by HopCompID (628) associated with the message sent. It is recommended that this value be the MsgSeqNum (34) of the message sent by the third party. FIX.4.3

Used in messages