What Exactly Do You Receive from an ITCH Feed?

Unlike “retail quotes” that often contain only Bid/Ask snapshots, ITCH provides a high-resolution stream of events that form the market in real time. It is an outbound market data feed only (no order entry), designed for maximum throughput and minimal latency.

ITCH is commonly paired with execution technologies such as FIX, native exchange gateways, or broker APIs. In practice, the fastest setups receive ITCH inside the data center and execute through the shortest possible route.

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Why ITCH Requires 10Gb / 40Gb and Co-Location

ITCH streams can be extremely “dense” because the exchange sends high-frequency event updates (often unshaped traffic). To sustain this throughput with minimal jitter, firms typically need 10 GbE or 40 GbE network connectivity into the data center.

The practical infrastructure stack often includes:

• co-location racks inside major facilities (e.g., Equinix),
• dedicated cross-connects to exchange / ECN infrastructure,
• bare-metal Linux servers tuned for low latency,
• kernel bypass / optimized NIC drivers (in institutional setups),
• FPGA or ultra-fast parsers for the most latency-sensitive strategies.

This is why ITCH is “fast but expensive”: the feed itself, network requirements, and co-location costs are typically far beyond standard retail trading infrastructure.

How ITCH Helps Latency Arbitrage

Latency arbitrage is based on one simple fact: different venues and systems do not update at the same time. If you receive the “true” market first, you can detect a price move before slower venues adjust.

• ITCH shows the move first (exchange-grade order flow).
• Slower broker terminals update later (hundreds of milliseconds or even seconds).
• The gap creates a short window where fast traders can execute at outdated prices.

This is why ITCH is a core technology in professional HFT — it improves both signal timing and measurement accuracy, allowing strategies to work with real microsecond-scale market events.

Conclusion – Why ITCH Is “Fastest Quotes, Highest Cost”

ITCH is built for pure performance: full order book data, nanosecond timestamps, and maximum throughput. But the speed comes with requirements: co-location, high-bandwidth links, specialized parsing, and professional infrastructure.

If your strategy depends on being first, ITCH is one of the most powerful sources of market truth. If your strategy depends on execution, ITCH is best combined with FIX or direct gateways — creating a complete HFT stack.

In ultra-fast markets, the rule stays simple:
who receives the real price first — wins.