New Order Single <D> - Buildmarkets

Overview

The New Order Single message (MsgType = "D") creates new equity or single-leg option orders through the FIX Gateway.

Field Layout

Tag	Field	Description	Required	Type	Values
1	Account	Trading account	Y	String
11	ClOrdID	Unique order identifier assigned by client	Y	String
38	OrderQty	Order quantity (contracts or shares)	Y	Qty	`0` for Dollar Amount orders
40	OrdType	Order type	Y	Char	`1`=Market, `2`=Limit, `3`=Stop, `4`=Stop Limit
44	Price	Limit price per unit	C	Price	Required when OrdType = 2 or 4
48	SecurityID	Security identifier (venue-specific)	N	String
54	Side	Order side	Y	Char	`1`=Buy, `2`=Sell
55	Symbol	Security symbol (uppercase)	Y	String	e.g., `AAPL`, `MSFT`
59	TimeInForce	Duration of order	Y	Char	`0`=Day, `1`=GTC
60	TransactTime	Transaction timestamp	Y	UTCTimestamp
76	ExecBroker	Executing broker identifier	N	String
99	StopPx	Stop price	N	Price	Required when OrdType = 3 or 4
152	CashOrderQty	Dollar amount for notional orders	N	Numeric	See Dollar Amount Orders
167	SecurityType	Instrument type	Y	String	`CS`=Common Stock, `OPT`=Option
200	MaturityMonthYear	Option expiry year/month	N	MonthYear	Format: `YYYYMM`
201	PutOrCall	Put or Call indicator	N	Int	`0`=Put, `1`=Call
202	StrikePrice	Option strike price	N	Price
205	MaturityDay	Option expiry day of month	N	Int	1–31

Examples

Equity Market Order — Buy 100 shares of AAPL at market

8=FIX.4.4|35=D|49=CLIENT1|56=BUILDMARKETS|11=ORD-20260212-001|1=ACC123456789|55=AAPL|167=CS|54=1|38=100|40=1|59=0|60=20260212-14:30:00.000|10=123|

Equity Limit Order — Buy 50 shares of MSFT at $420.00 limit, GTC

8=FIX.4.4|35=D|49=CLIENT1|56=BUILDMARKETS|11=ORD-20260212-002|1=ACC123456789|55=MSFT|167=CS|54=1|38=50|40=2|44=420.00|59=1|60=20260212-14:30:00.000|10=045|

Single-Leg Option Order — Buy 5 AAPL March 2026 $230 Call contracts at$ 4.50 limit

8=FIX.4.4|35=D|49=CLIENT1|56=BUILDMARKETS|11=ORD-20260212-003|1=ACC123456789|55=AAPL|167=OPT|54=1|38=5|40=2|44=4.50|59=0|201=1|202=230.00|200=202603|205=20|60=20260212-14:30:00.000|10=067|

Option Field Notes

When SecurityType=OPT: Tag 201 (PutOrCall) — 0=Put, 1=Call (FIX convention differs from REST API); Tag 200 (MaturityMonthYear) — Format YYYYMM (e.g., 202603 for March 2026); Tag 205 (MaturityDay) — Day of expiration (e.g., 20); Tag 202 (StrikePrice) — Decimal strike price.

REST Equivalent

Equity orders: POST /api/external/create with SymbolType=1
Option orders: POST /api/external/create with SymbolType=2 and OptionOrderLegs.* parameters