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StandardHeader

The standard FIX message header

TagNameTypeRequiredDescription
8String
Required
FIX.4.4 (Always unencrypted, must be first field in message)
9Length
Required
Always unencrypted, must be second field in message
35String Enum
Required
Always unencrypted, must be third field in message
49String
Required
Always unencrypted
56String
Required
Always unencrypted
115StringTrading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
128StringTrading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
90LengthRequired to identify length of encrypted section of message. (Always unencrypted)
91DataRequired when message body is encrypted. Always immediately follows SecureDataLen field
34SeqNum
Required
Can be embedded within encrypted data section
50StringCan be embedded within encrypted data section
142StringSender's LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
57String"ADMIN" reserved for administrative messages not intended for a specific user. (Can be embedded within encrypted data section.)
143StringTrading partner LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
116StringTrading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
144StringTrading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)
129StringTrading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
145StringTrading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)
43Boolean EnumAlways 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.)
97Boolean EnumRequired when message may be duplicate of another message sent under a different sequence number. (Can be embedded within encrypted data section.)
52UTCTimestamp
Required
Can be embedded within encrypted data section
122UTCTimestampRequired 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.)
212LengthRequired when specifying XmlData to identify the length of a XmlData message block. (Can be embedded within encrypted data section.)
213DataCan contain an XML formatted message block (e.g. FIXML). Always immediately follows XmlDataLen field. (Can be embedded within encrypted data section.) See Volume 1: FIXML Support
347String EnumType of message encoding (non-ASCII characters) used in a message’s "Encoded" fields. Required if any "Encoding" fields are used
369SeqNumThe 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
ComponentNumber 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