What is the difference between A-Book and B-Book brokers?

The main difference is how they handle client orders. An A-Book broker (Agency model) passes all client trades directly to a liquidity provider, earning a commission or markup with no conflict of interest. A B-Book broker (Dealing Desk/Market Maker) takes the other side of client trades, internalizing the risk. Their profit comes from the client's losses.

What is a Hybrid Model broker?

A Hybrid Model is the most common approach for successful brokers. They use sophisticated software to profile traders. Unprofitable or small-volume traders are kept on the B-Book, while large, consistently profitable traders (or those using scalping EAs) are passed to the A-Book to hedge the risk.

For the trader, a well-regulated B-Book broker is perfectly safe. For the broker, the B-Book model is only safe if it's managed by experienced professionals with advanced risk management tools. Without proper risk management, a few large winning trades from clients could bankrupt an unprepared B-Book broker.

How can you identify a B-Book broker?

It's difficult for a trader to be 100% certain, but signs of a B-Book broker can include fixed spreads, promotions like no-deposit bonuses, and restrictions on certain trading styles like scalping. However, most successful brokers today use a Hybrid model, so they operate both an A-Book and a B-Book.

BUSINESS MODEL GUIDE

A-Book vs. B-Book Broker: Choosing the Right Model (2025)

Q: What is an A-Book broker?

An A-Book broker operates on an agency model, also known as Straight Through Processing (STP). They send all client orders directly to the external market (liquidity providers). They do not trade against their clients and make money purely from spreads and commissions, regardless of whether the client wins or loses.

Q: What is a B-Book broker?

A B-Book broker is a market maker or dealing desk. They internalize client trades, meaning they take the opposite side of the transaction. If a client buys, the broker sells. The broker's profit is the client's loss. This model is highly profitable but requires sophisticated risk management.

Your risk management model is the engine of your brokerage's profitability. This guide breaks down the critical difference between A-Book, B-Book, and Hybrid models to help you make the smartest choice.

When you start a forex brokerage, one of the most fundamental decisions you'll make is how to handle your clients' orders. This decision defines your risk management strategy and your primary revenue stream. The industry standard terms for these models are **A-Book** and **B-Book**.

A flowchart showing the difference between A-Book and B-Book order execution

What is an A-Book Broker? (The Agency Model)

An **A-Book broker** operates on a Straight Through Processing (STP) or agency model. When a client places a trade, the broker instantly passes that trade on to the external market through a liquidity provider. The broker acts as an intermediary or an "agent."

How they make money: A-Book brokers make money by adding a small, fixed markup to the spread or by charging a commission on each trade. Their income is directly tied to their clients' trading volume.
Conflict of Interest: There is no conflict of interest. The broker wants their clients to be successful and trade more, as this increases their volume-based revenue.
Risk: The broker carries zero market risk. All risk is passed on to the liquidity provider.

What is a B-Book Broker? (The Market Maker Model)

A **B-Book broker** is a dealing desk or "market maker." Instead of passing trades to the external market, they internalize them. This means the broker takes the other side of the client's trade. If the client buys EUR/USD, the broker sells it to them. The broker creates the "market" for their clients.

How they make money: The broker's primary profit comes from their clients' trading losses. Since statistics show that the majority of retail traders lose money over time, this can be a very profitable model.
Conflict of Interest: There is a direct conflict of interest, as the broker profits when the client loses.
Risk: The broker carries 100% of the market risk. If a client has a large winning trade, the broker must pay it out of their own capital. This model is only safe for the broker if managed with sophisticated risk management tools.

The Smartest Choice: The Hybrid Model

In reality, very few successful brokers operate as 100% A-Book or 100% B-Book. The vast majority use a **Hybrid Model**, which combines the best of both worlds and is the industry standard for risk management.

Here's how it works: The broker uses advanced risk management software (often part of the CRM or a separate plugin) to profile clients and individual trades. Based on pre-defined rules, the system automatically decides whether to A-Book or B-Book a trade.

Small, consistently unprofitable traders are kept on the B-Book.
Large, professional, or consistently profitable traders are automatically passed to the A-Book to hedge the risk.
Trades using risky strategies (like high-frequency scalping EAs) are often sent to the A-Book.

The Hybrid Model allows a broker to maximize profitability by internalizing predictable losses while protecting themselves from the significant risk of large, successful traders.

Expert Guidance on Your Business Model

Choosing and implementing the right risk management strategy is critical to your brokerage's success. An improperly managed B-Book can lead to catastrophic losses. Our team has over 7 years of experience in helping brokers structure and implement profitable and secure Hybrid models. Contact us for a free consultation to discuss the best operational model for your business.