Execution Fill Rate

The execution fill rate is the percentage of an order that is successfully executed at the desired price or within a specified tolerance range. A high fill rate indicates that the chosen execution strategy is effectively capturing available liquidity, while a low fill rate suggests that the order is too aggressive, too large, or that the market lacks sufficient depth.

This metric is a vital performance indicator for trading desks, as it directly impacts the speed and cost of position building. When fill rates drop, traders may need to adjust their strategy, perhaps by increasing their limit prices or splitting the order across more venues.

Understanding the factors that drive fill rates helps in refining algorithms to ensure that trading objectives are met without incurring unnecessary costs or exposing the portfolio to excessive risk.