High-Frequency Trading

From the first electronic network (1969) to nanosecond execution. The firms, technology, microwave infrastructure, and regulatory battles that reshaped global capital markets.
2,000,000× faster since 1995 18 firms profiled 6 microwave routes 40+ timeline events

Overview

The numbers that define modern market microstructure

Latency: Then
1000ms
1995 — dial-up modem to exchange
Latency: Now
0.5μs
2023 — custom ASIC + integrated optics
Golden Route
3.97ms
Chicago → NJ via microwave (vs 6.55ms fiber)
Citadel Market Share
25%
of all US equity volume (single firm)

Pages

Three deep dives into the HFT ecosystem

History & Firms

57-year timeline from Instinet (1969) and Island ECN through the Flash Crash, Flash Boys, and the Consolidated Audit Trail. 18 major firms — Citadel, Virtu, Jane Street, Jump, Renaissance, and more. Market venues across equities, futures, FX, and crypto. 8 trading strategies from market making to MEV.

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The Latency Stack

Log-scale chart showing 2,000,000× improvement (1000ms → 0.5μs). Network infrastructure: fiber (0.67c) vs microwave (0.9997c) vs laser. Compute: CPU → FPGA → ASIC. Software: kernel bypass, lock-free structures, DPDK. The physics limit — when the speed of light is the bottleneck.

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Microwave Routes & Tower Wars

6 major routes tower by tower: Chicago–NJ (20 towers, 39% advantage), London–Frankfurt, Tokyo–Osaka, NJ Triangle. Operators: McKay Brothers, New Line (Jump+Virtu), Anova. The arb math, the West Chicago mystery antenna, tower wars, weather risk, and why a microsecond is worth $10M/year.

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Key Concepts

The ideas that drive HFT

The Refractive Index Arbitrage
Light travels at 0.67c in glass fiber (refractive index n=1.47) but 0.9997c in air. This 32% speed difference over a 1,130 km route (Chicago–NJ) creates a 2.58ms window. The entire microwave tower industry exists because of this one physics fact.
Reg NMS — The Catalyst
The SEC's 2005 Order Protection Rule requires brokers to route to the venue with the best price. This created an arms race: whoever knows the best price first captures the order. Speed became the only competitive advantage that mattered.
The Concentration Paradox
HFT was supposed to democratize markets through technology. Instead, a single firm (Citadel Securities) handles 25% of all US equity volume and 40% of retail orders. The top 5 firms control 60%+. Scale advantages compound — more flow means better pricing means more flow.