FIFO Queue Management

FIFO, or First-In-First-Out, is the standard rule used by many matching engines to determine the order in which trades are executed. If multiple orders exist at the same price, the one that arrived first is processed first.

Managing one’s position in this queue is a crucial aspect of HFT strategy. Firms aim to be at the front of the queue to ensure their orders are filled before others.

This requires precise timing and network optimization to send orders the moment a price opportunity is identified. If an order is modified or canceled, it typically loses its place in the queue.

Understanding the nuances of how different exchanges manage their FIFO queues allows traders to optimize their order placement and increase their fill rates. It is a technical game of precision where the earliest arrival time wins.