Latency Arbitrage: The Microsecond Trading Strategy That Exploits Speed Advantages

Latency arbitrage is a high-frequency trading (HFT) strategy that exploits speed advantages to transact on prices that have changed on one exchange before the update propagates to another. The profit comes from the microsecond (or sub-microsecond) gap between when a price moves and when all venues reflect that move. ## How It Works A stock's price changes on NYSE. An HFT firm with faster data feeds and co-located servers sees the change before other exchanges update their quotes. The firm immediately trades at the stale price on the slower venue, profiting from the known-correct new price. Each trade's profit is tiny (fractions of a cent), but at millions of trades per day, the strategy generates significant revenue. ## Infrastructure Latency arbitrage depends on physical infrastructure advantages: co-location (servers physically adjacent to exchange matching engines), microwave/laser data links (faster than fiber optic), and custom hardware (FPGAs processing market data in nanoseconds). ## IEX's Response The IEX Exchange, founded by Brad Katsuyama and made famous by Michael Lewis's *Flash Boys*, introduced a 350-microsecond "speed bump" — a coil of fiber optic cable that delays all incoming orders, neutralizing the microsecond advantages that latency arbitrage requires. **See also:** High-Frequency Trading (HFT): How Microsecond Advantages Generate Billions