High-Frequency Latency Floor (IEX Speed Bump)
The Formal Definition
A structural market design feature (pioneered by the Investors Exchange / IEX) that introduces a deliberate, physical microsecond delay (e.g., a 350-microsecond coil of fiber-optic cable) on incoming orders, neutralizing latency-arbitrage algorithms that race ahead of public quotes.
Latency Floor = Physical Transit Delay (38 Miles of Coiled Fiber = 350 Microseconds) > HFT Inter-Exchange Signal Transmission Advantage
Cole Barrett's Reality Check
The Unvarnished Bottom Line"The IEX speed bump was built to level the playing field against high-frequency traders. When an institutional order hits an exchange in New York, HFT algorithms try to race that information to other exchanges in New Jersey to step ahead of the rest of the trade. IEX sends all incoming orders through a 38-mile spool of coiled fiber optic cable, slowing everyone down by 350 microseconds so market prices can update before algorithms front-run the trade."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: Executing a 5,000-share institutional buy order across multiple fragmented public exchanges
| Execution Metric | IEX Speed-Bump Route (Discretionary Peg) | Standard Unbuffered Lit Route |
|---|---|---|
| Fee / Rate | $1.50 ticket fee | $0.00 'free' |
| Spread / Buffer | Order entered IEX 350-microsecond latency buffer | Order executed on Venue A; HFT detected fill and raced to Venue B |
| Execution / Status | Exchange updated internal resting peg quotes before external HFT algorithms arrived | HFT canceled offers and stepped ahead on remaining venues |
| Total Cost / Result | Completely neutralized high-frequency latency arbitrage | Front-run by cross-market latency arbitrage algorithms |
How Brokers Weaponize This Term
High-frequency market makers and traditional exchanges fought against the SEC approval of the IEX speed bump because eliminating latency arbitrage removes billions in institutional algorithmic trading revenue.
Broker Evaluation Matrix
Cole Approves
Interactive Brokers: Native support for direct order routing to IEX, allowing traders to select IEX Discretionary Peg (D-Peg) orders to neutralize latency arbitrage.
Read Audit →Cole Flags / Avoids
PFOF Mobile Apps: Blocks direct IEX routing, funneling order flow to internalizer desks that exploit cross-exchange latency differentials.
View Trap Details →Frequently Asked Questions
What book made the IEX speed bump famous?
Michael Lewis's 2014 bestselling book *Flash Boys: A Wall Street Revolt*, which detailed the founding of IEX by Brad Katsuyama to combat predatory HFT.
How long is 350 microseconds?
0.00035 seconds—imperceptible to human senses, but an eternity for electronic algorithms operating at nanosecond speeds.