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Liquidity & Risk10 September 2026 · 6 min read

A-Book vs B-Book vs Hybrid: Choosing Your Execution Model

What each execution model means for risk, revenue and client experience, and how brokers combine them in practice.

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Your execution model shapes risk, revenue and client experience more than almost any other decision. Here is what A-book, B-book and hybrid actually mean in practice, and how brokers combine them.

A-book: passing flow to liquidity providers

  • How STP execution works through a bridge
  • Revenue from spreads and commissions
  • Lower risk, lower margin, dependence on LP pricing

B-book: internalising flow

  • Acting as the counterparty to client trades
  • Higher potential revenue with real market risk
  • Why risk management tools are non-negotiable

Hybrid: routing by client and symbol

  • Classifying clients by profitability and behaviour
  • Rules by symbol, group or volume
  • Switching models without changing platforms

Choosing for your brokerage

  • Questions to ask about volumes, capital and risk appetite
  • How a liquidity bridge with smart routing supports all three models
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