Options accounts & routing
What is price improvement on multi-leg option orders and how do electronic exchanges handle complex order boxes?
By Easy Money Scanner · Educational reference · Not investment advice
The short answer
Price improvement on multi-leg orders occurs when an exchange's complex order book matches a spread at a net price better than the National Best Bid/Offer implies, with exchanges auctioning complex orders against resting interest and market maker quotes.
How it works
Exchanges like Cboe operate dedicated complex order books that aggregate interest across individual option legs, allowing algorithms and market makers to provide tighter net pricing than simply summing individual leg quotes.
An example
A four-leg iron condor might execute at a net credit slightly better than the sum of each leg's quoted bid-ask midpoint due to complex order book matching logic.
Risk & limitations
Price improvement is not guaranteed and depends on resting liquidity; illiquid or wide multi-leg spreads may fill only at the stated limit price with no improvement.
Examples are hypothetical, not trade recommendations. US contract and regulatory references do not automatically apply in Canada. Rules, margin requirements and broker policies can change; confirm them with the relevant authority and your broker.