Order Cancel Request <F> - Buildmarkets

Overview

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

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.

Required Fields

Tag	Field	Description	Type
1	Account	Trading account identifier	String
11	ClOrdID	Unique identifier for cancel request	String
37	OrderId	OrderId from the gateway	String
41	OrigClOrdID	ClOrdID of order being cancelled	String
48	SecurityID	Security identifier (numeric)	Numeric
55	Symbol	Security symbol in uppercase	String
60	TransactTime	Transaction timestamp	UTCTimestamp
167	SecurityType	Type: CS (stock), OPT (option), MLEG (multileg)	String

Optional Fields

Tag	Field	Description
54	Side	Must match original order’s side (1=Buy, 2=Sell)

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|

REST Alternatives

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