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StandardHeader

The standard FIX message header

TagNameTypeRequiredDescription
8
BeginString
String
Required
FIX.4.2 (Always unencrypted, must be first field in message)
9
BodyLength
Int
Required
Always unencrypted, must be second field in message
35
MsgType
String Enum
Required
Always unencrypted, must be third field in message
49
SenderCompID
String
Required
Always unencrypted
56
TargetCompID
String
Required
Always unencrypted
115
OnBehalfOfCompID
String
Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
128
DeliverToCompID
String
Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
90
SecureDataLen
Int
Required to identify length of encrypted section of message. (Always unencrypted)
91
SecureData
Data
Required when message body is encrypted. Always immediately follows SecureDataLen field
34
MsgSeqNum
Int
Required
Can be embedded within encrypted data section
50
SenderSubID
String
Can be embedded within encrypted data section
142
SenderLocationID
String
Sender's LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
57
TargetSubID
String
"ADMIN" reserved for administrative messages not intended for a specific user. (Can be embedded within encrypted data section.)
143
TargetLocationID
String
Trading partner LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
116
OnBehalfOfSubID
String
Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
144
OnBehalfOfLocationID
String
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.)
129
DeliverToSubID
String
Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
145
DeliverToLocationID
String
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.)
43
PossDupFlag
Boolean Enum
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.)
97
PossResend
Boolean Enum
Required when message may be duplicate of another message sent under a different sequence number. (Can be embedded within encrypted data section.)
52
SendingTime
UTCTimestamp
Required
Can be embedded within encrypted data section
122
OrigSendingTime
UTCTimestamp
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.)
212
XmlDataLen
Int
Required when specifying XmlData to identify the length of a XmlData message block. (Can be embedded within encrypted data section.)
213
XmlData
Data
Can contain an XML-formatted message block (e.g. FIXML). Always immediately follows XmlDataLen field. (Can be embedded within encrypted data section.) See Appendix M – FIXML Support
347
MessageEncoding
String Enum
Type of message encoding (non-ASCII characters) used in a message’s "Encoded" fields. Required if any "Encoding" fields are used
369
LastMsgSeqNumProcessed
Int
The last MsgSeqNum value received and processed. Can be specified on every message sent. Useful for detecting a backlog with a counterparty
370
OnBehalfOfSendingTime
UTCTimestamp
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")