Previously in this column, we discussed the execution costs associated with bull call spread and the differences between setting up basket orders and multi-leg orders for ratio spreads. This week, we discuss the execution risk of setting up multi-leg orders, with specific reference to the butterfly spread.

You must be mindful of the execution risks arising from the technology architecture for trading, especially if you are an active options trader. This is primarily important when you place multi-leg orders. Take butterfly call spread. This involves going long on a lower strike call and a higher strike call and short on a middle strike call. Note that the strikes must be equidistant from each other and in the ratio of 1:2:1, where the short middle strike is twice the quantity of the long outer strikes. 

As an options trader, you are likely to choose between your brokers who offer basket orders and multi-leg orders. Basket orders are trading engines offered by brokers that are also designed to optimise your trade to avail the NSE SPAN spread margin benefits. The flip side is that the trade can expose you to partial fills or alternatively to some slippage costs. Partial fills can happen when you place a limit order and one or more legs in the butterfly spread is not filled at that price. Slippage costs can occur when you place a market order, and the order is filled at a lower price for short strikes or at a higher price for the long price compared to the price at which the strikes were trading when you placed the order.

A multi-leg order can help you manage this slippage cost but has high likelihood of order rejection. Why? For a butterfly spread, you must select the strikes and then mention the net credit or net debit at which you want to execute the spread. Note that butterfly spread can be set up either as a net credit spread or as a net debit spread, depending on the strikes you select. The issue is that your trade can be rejected if NSE is unable to fill your order at your stated net debit or net credit amount. Suffice it to understand that based on NSE’s trading architecture, you can improve the chances of executing your butterfly spread by being mindful of your choice of strikes; wider the strikes, less likely your multi-leg order will be executed at your desired net credit or net debit. Choosing strikes with 100-interval difference on the Nifty Index may be optimal as it balances the likelihood of order execution with decent upside potential. 

A success roundtrip transaction involves four important trading aspects. One, your outlook on an underlying. Two, knowing the optimal futures/options strategy to apply for the given outlook. Three, that the chosen strategy has a good reward-to-risk ratio. And four, the most efficient way to initiate the trade and complete the roundtrip.

(The author offers training programmes for individuals to manage their personal investments)

Published on September 19, 2026