Order-to-Trade Ratio
Market Microstructure glossary · High Frequency Dynamics & Latency Arbitrage
Definition
The ratio of submitted orders (and amendments/cancels) to executed trades. Used by venues and regulators to identify quote-stuffing and inefficient order behavior.
Order-to-Trade Ratio in plain English
Every time you want to trade, you send the exchange a message — an order — and you can also send messages to change or cancel it. The order-to-trade ratio just counts how many of those messages you send for each trade that actually happens. If someone fires off thousands of orders but almost never trades, that's a red flag: they might be 'quote-stuffing' (flooding the system to slow it down or trick others), so exchanges and regulators watch this ratio to spot manipulation and clogged, wasteful behavior. Think of it like someone who reserves a hundred restaurant tables online but shows up to eat at just one — the wildly lopsided ratio tells you something's off.
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