A-book and B-book: how brokers actually handle orders
Posted: Fri Oct 30, 2026 2:24 pm
Brokers decide what to do with client orders. Some pass them to the market (A-book), others keep them in house as counterparty (B-book), and many use a hybrid.
The B-book model creates a conflict of interest: the broker profits when the client loses. Brokers using it have an incentive to identify profitable clients and treat them differently, for example by routing them to the A-book, widening spreads or adding execution delay.
Scalpers, who often exhibit patterns distinct from typical retail flow, are especially exposed to this treatment.
Transparent brokers explain their model. Regulators in some regions require disclosure of how orders are handled.
Warning signs include execution quality that worsens as an account becomes profitable, unexplained order rejections on winning trades and sudden changes to account conditions.
Choosing a broker with a pure agency model and low markups on raw spreads reduces the conflict.
What is known about the order handling model at the broker used here?
The B-book model creates a conflict of interest: the broker profits when the client loses. Brokers using it have an incentive to identify profitable clients and treat them differently, for example by routing them to the A-book, widening spreads or adding execution delay.
Scalpers, who often exhibit patterns distinct from typical retail flow, are especially exposed to this treatment.
Transparent brokers explain their model. Regulators in some regions require disclosure of how orders are handled.
Warning signs include execution quality that worsens as an account becomes profitable, unexplained order rejections on winning trades and sudden changes to account conditions.
Choosing a broker with a pure agency model and low markups on raw spreads reduces the conflict.
What is known about the order handling model at the broker used here?