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Overview

The Order Cancel Request message (MsgType = “F”) enables cancellation of all remaining quantity on an existing order within the Buildmarkets FIX Gateway.

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Key Warning

“A cancel request may be rejected if the order is already filled, expired, or in a non-cancellable state.” Monitor for either confirmation via Execution Report or denial via Order Cancel Reject.

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Required Fields

TagFieldDescriptionType
1AccountTrading account identifierString
11ClOrdIDUnique identifier for cancel requestString
37OrderIdOrderId from the gatewayString
41OrigClOrdIDClOrdID of order being cancelledString
48SecurityIDSecurity identifier (numeric)Numeric
55SymbolSecurity symbol in uppercaseString
60TransactTimeTransaction timestampUTCTimestamp
167SecurityTypeType: CS (stock), OPT (option), MLEG (multileg)String

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Optional Fields

TagFieldDescription
54SideMust match original order’s side (1=Buy, 2=Sell)

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Message Examples

Equity Order Cancellation: 
8=FIX.4.4|35=F|49=CLIENT1|56=BUILDMARKETS|11=CXL-20260212-001|1=ACC123456789|37=BMKT-78450|41=ORD-20260212-001|55=AAPL|167=CS|54=1|60=20260212-15:00:00.000|10=034|
Option Order Cancellation: 
8=FIX.4.4|35=F|49=CLIENT1|56=BUILDMARKETS|11=CXL-20260212-002|1=ACC123456789|37=BMKT-78451|41=ORD-20260212-003|55=AAPL|167=OPT|54=1|60=20260212-15:00:00.000|10=056|
Multileg Order Cancellation: 
8=FIX.4.4|35=F|49=CLIENT1|56=BUILDMARKETS|11=CXL-20260212-003|1=ACC123456789|37=BMKT-78460|41=MLEG-20260212-001|55=AAPL|167=MLEG|54=1|60=20260212-15:00:00.000|10=078|

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REST Alternatives

  • Single-leg: POST /api/external/cancel?OrderCode={code}&AccountNo={acct}
  • Multi-leg: POST /api/Order/CancelMultiLegOrder (JSON body)