> ## Documentation Index
> Fetch the complete documentation index at: https://developer.buildmarkets.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# New Order Multileg <AB>

> How to create multi-leg orders for complex strategies such as spreads, straddles, butterflies, and iron condors via FIX.

## Overview

The New Order Multileg message (MsgType = `"AB"`) enables creation of multi-leg orders for complex trading strategies. It "Creates a multi-leg order supporting strategies such as covered calls, vertical spreads, straddles, strangles, butterflies, and iron condors."

## Key Requirements

For multileg orders, you must set `SecurityType=MLEG` (Tag 167), with each leg defined in a repeating group starting at Tag 555 (NoLegs).

## Order-Level Fields

* **Account** (Tag 1): Trading account identifier
* **ClOrdID** (Tag 11): Unique client-assigned order identifier
* **OrderQty** (Tag 38): Number of spreads/contracts (0 for Dollar Amount orders)
* **OrdType** (Tag 40): Order type (1=Market, 2=Limit, 3=Stop, 4=Stop Limit)
* **Price** (Tag 44): Net debit/credit limit price for entire spread
* **Side** (Tag 54): Buy (1) or Sell (2)
* **Symbol** (Tag 55): Underlying symbol in uppercase
* **TimeInForce** (Tag 59): Day (0) or GTC (1)
* **TransactTime** (Tag 60): UTC timestamp

## Leg Repeating Group (Tag 555)

Each leg specifies 2-4 components using fields like: **LegSymbol** (Tag 600); **LegSecurityType** (Tag 609): CS for stock, OPT for options; **LegStrikePrice** (Tag 612); **LegSide** (Tag 624); **LegQty** (Tag 687).

## Examples Provided

The documentation includes sample FIX messages for bull call spreads, iron condors, and covered call strategies demonstrating proper syntax and field ordering.