“A book and B book” in Forex trading refers to a broker’s system of risk management.

‘A booking’ involves passing client trades directly to a liquidity provider or interbank market, whereas ‘B booking’ means the broker takes the opposite side of the trade.

The use of A book and B book models allows brokers to manage risk effectively and cater to a diverse range of clients with different trading strategies and levels of experience.

However, the potential conflict of interest inherent in the B book model is a subject of scrutiny and debate in the Forex community.

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What is a B-Book broker?

A B-Book broker in Forex trading operates by taking the opposite side of their clients’ trades without hedging these positions with a liquidity provider (LP). This approach means the broker internalizes the trade and assumes 100% of the risk associated with the client’s order. If a client loses money on a trade, the broker profits an equivalent amount, and if the client wins, the broker incurs a loss.

The rationale behind the B-Book model is grounded in the statistical likelihood that most retail traders will lose money in Forex trading. Statistics indicate that between 74-89% of retail accounts lose money, suggesting that a significant majority of traders make incorrect trading decisions. This tendency allows B-Book brokers to profit more often than not, as they typically end up on the winning side of these losing trades.

A B-Book broker, also referred to as a Market Maker broker, prefers this model because it is often more profitable than only collecting spreads markup or commissions, like in the A-Book model. In essence, B-Book brokers or Market Maker brokers act as the ‘house’ in the trading scenario, similar to a casino, where the odds are statistically in their favour given the high percentage of losing retail traders​​.

How do B-Book Forex brokers make money?

A B-Book Forex broker primarily earns through the spread on trades and profits from client losses. In this model, the broker always acts as a counterparty to trades, meaning when a trader loses, the broker profits. This structure is especially lucrative considering 74-89% of retail accounts typically incur losses.

When a trader opens a position, the broker takes the opposite position in their own books. This setup allows them to earn from the spread, which is the difference between the buy and sell price of a currency pair. The spread is a cost to the trader but a revenue for the broker on each trade, regardless of its outcome or direction.

The second significant income source for B-Book brokers is the losses of their traders. Since a substantial percentage of retail Forex traders, between 74% and 89%, tend to lose money in the long run, these losses become the broker’s gains. In essence, when a trader’s position moves against them, the loss is effectively transferred to the broker’s account.

How do B-Book Forex brokers manage risks?

In a pure B-Book model, brokers can mitigate counterparty risks by internally offsetting trades among their clients. This involves matching a client’s trade with another client’s opposing trade. By doing this, the broker can neutralize the market risk to some extent without needing to hedge externally.

For instance, if one client is buying a certain currency pair, the broker can offset this risk by matching it with another client who is selling the same currency pair. This internal matching reduces the broker’s exposure to market fluctuations, as the gains of one client will counterbalance the losses of another.

However, it’s important to note that this strategy relies on having a sufficiently large and diverse client base to effectively match opposing positions. In cases where there is an imbalance in trading positions (for example, if a majority of clients are on the same side of a trade), the broker might still face significant risks.

What is an A-Book broker?

An A-Book broker in Forex trading operates by transferring the market risk associated with a client’s trade to a third party. Although the broker still acts as the counterparty to the client’s trade, it does not internalize the trade as with B-Book execution.

Instead, it hedges or offloads this risk to another market participant in the institutional FX market, which could be a bank, a non-bank electronic market maker, a hedge fund, or even another Forex broker.

The counterparty to the trade opened by the broker is called a liquidity provider (LP). A liquidity provider always stands ready to buy or sell as needed by the broker to maintain liquidity.

Whenever a client places an order, the A-Book broker, also commonly referred to as Non-Dealing Desk broker (NDD), simultaneously enters into a corresponding trade with a liquidity provider, ensuring the broker’s exposure to market risk is hedged. In other words, even if the trade opened by the trader goes into profit, causing a loss for the broker, the broker will make up the loss with the trade he opened with his liquidity provider.

This process, known as A-Book execution, allows the broker to mitigate the risk of being on the losing end of the trade, as it offsets its position with the liquidity provider. Thus, an A-Book broker operates by managing its risk exposure through external hedging with institutional market participants​​.

In the case of A-Book, the broker’s profit is mainly based on spread markups or commissions on trades.

How do A-Book Forex brokers make money?

An A-Book Forex broker generates revenue by charging commissions on trades or applying a spread markup. They pass client orders to liquidity providers, offsetting risks, and then they earn through a commission calculated on the trade, or through the difference between the spread offered to clients and that obtained from liquidity providers.

Commissions are fees charged to the trader based on the size of the trade. The structure of these commissions can vary: some brokers charge per lot traded, others per million USD traded, or as a percentage of the trading volume. This fee structure is transparent, and traders pay the commission regardless of the trade outcome.

With spread markup instead, the broker adds a small extra charge to the spread, the difference between the buy and sell prices. They achieve this by offering slightly worse rates to their clients than the rates they receive from their LPs.

Do B-Book brokers trade against their clients?

Both B-Book and A-Book brokers technically trade against their clients, but the key difference lies in how they manage the associated risks.

In the B-Book model, brokers do not hedge or offset their clients’ trades with third parties. They take the opposite side of their clients’ trades, which means that the broker’s profits are the clients’ losses and vice versa. This can potentially create a conflict of interest, as the broker benefits directly from client losses.

On the other hand, in the A-Book model, while the broker technically takes the opposite side of the trade, they mitigate this risk by offsetting or hedging these positions with third parties in the institutional FX market (Liquidity providers). This way, the broker’s profits and losses are not directly tied to the client’s losses and gains. Instead, the broker earns from the spread or commission, and any risk from the trade is transferred to a third party. As a result, in the A-Book model, the trader’s and broker’s profits and losses with directly cancel each other out.

So, while both models involve the broker acting as the counterparty to the client, the fundamental difference lies in how they manage the resulting exposure and potential conflict of interest. B-Book brokers retain the risk, while A-Book brokers transfer it.

Do B-Book brokers have conflicts of interest?

Yes, B-Book Forex brokers have a potential conflict of interest. However, the perception of B-Book brokers having a conflict of interest is a bit narrow and doesn’t capture the whole picture. While it’s true that B-Book brokers might benefit from their clients’ losses since they often take the opposite side of client trades, their business model isn’t solely focused on client losses.

A B-Book broker’s primary goal is often to maintain a large and diverse user base. This diversity allows them to internally offset as many trades as possible. By matching opposing positions among their own clients, they can effectively neutralize some of the market risks. For example, if one client is buying a certain currency pair, and another is selling the same pair, the broker can match these trades internally. This internal offsetting reduces the broker’s exposure to market movements since the gains and losses among their client base can cancel each other out.

By achieving this internal balance, the broker isn’t as dependent on client losses for revenue. Instead, they can focus on earning from spreads or other trading fees. This model can be more sustainable in the long term, as it reduces the broker’s need to take on significant market risk and allows them to profit from providing trading services, regardless of whether individual traders are winning or losing.

Therefore, while there is a potential conflict of interest in the B-Book model, a well-managed B-Book operation aims for long-term sustainability by cultivating a large and balanced client base, thereby minimizing counterparty risks and generating revenue primarily through trading costs like spreads.

Are B-Book brokers legal?

Yes, B-Book brokers are legal in basically every jurisdictions around the world. The legality of B-Book brokers, like any financial service provider, depends on their compliance with the regulatory standards and legal requirements set forth in the jurisdictions in which they operate.

The functioning of Forex brokers, or rather Forex dealers, is well documented in Forex trading regulations all around the world. Forex regulatory bodies in various countries oversee these brokers to ensure fair practices. They are often required to maintain transparency, provide fair trading conditions, and protect clients’ funds.

What is better between A-Book and B-Book execution?

A-Book execution is often considered more transparent and fair for traders. Since the broker does not take the opposite side of the trade, there is less potential for conflict of interest. Traders also have access to better prices and professional tools such as Depth of Market (DoM). However, with A-Book brokers spreads can vary, even by a lot during periods of volatility, and slippage is more likely to occur.

On the other hand, B-Book execution, although involving an inherent conflict of interest, allows for potentially faster execution and the possibility of offering fixed spreads (although usually somewhat higher than average).

What are the differences between B-Book and A-Book brokers?

The below table outlines the fundamental operational and financial differences between the B-Book and A-Book models in Forex.

B-Book A-Book
Broker’s Role Takes the opposite side of client’s trade without hedging Transfers market risk to a third party (liquidity providers)
Risk Approach Internalizes the trade, assuming 100% of the risk Does not internalize the trade, hedges client’s position
Profit Mechanism Profits when the client loses and loses when the client wins Earnings primarily from spreads differentials or commissions
Revenue Model More profitable due to a high percentage of losing retail traders Model based on service fees, not dependent on client’s trade outcomes
Business Strategy Acts as the ‘house’, similar to a casino Operates by managing risk exposure through external hedging
Client Base Attracts clients with a high likelihood of losing their trades Attracts a broader range of clients, including more experienced traders

Are the best Forex brokers A-Book or B-Book?

The majority of brokers now apply both the A-Book and B-Book models, tailoring their approach based on the profile of the client or the nature of the trade. This mixed approach, often referred to as a “hybrid model”, allows brokers to optimize their risk management and profitability strategies.

Most brokers lean towards the B-Book model for a portion of their client base, largely because it can be more profitable. This model is often used for smaller, less experienced traders who are less likely to be profitable and pose less risk to the broker.

On the other hand, brokers are increasingly using the A-Book model for clients who are identified as more sophisticated or who engage in larger volume trades. This approach is preferred for its transparency and alignment of interests between the broker and the client.

Brokers considered to be of higher quality in the Forex trading industry, such as Pepperstone and IC Markets, often favour the A-Book model. These types of brokers cater to a clientele that typically includes more serious and experienced traders, for whom the benefits of direct market access, better execution, and transparent pricing are particularly attractive.

These Forex trading brokers have built their reputation on providing a trading environment that aligns with the best interests of their clients, which is a key factor in their perceived quality.

How are traders categorized as A-Book or B-Book?

Forex brokers categorize traders into A-book or B-book models primarily based on their trading profile and behaviour. This categorization involves a set of criteria that helps the broker determine the most appropriate risk management strategy for each trader.

Below is a list of the factors taken into account by Fx brokers for customer profiling:

  • Trading Volume and Frequency: High-volume traders or those who trade frequently are often categorized into the A-book model. These traders are generally more experienced and sophisticated, making them better suited for direct market access where the broker earns from spreads or commissions.
  • Profitability and Trading History: A trader’s historical performance and profitability are significant indicators. Consistently profitable traders are more likely to be placed in the A-book model, as their winning trades could pose a risk to a B-book broker who takes the opposite side of trades.
  • Deposit Size and Account Type: Traders who deposit larger sums and opt for premium account types are often categorized into the A-book model. Larger deposits signify a higher level of seriousness and potential trading expertise.
  • Trading Strategy: The broker may also consider the trader’s strategy. For example, traders who employ scalping or high-frequency trading might be placed in the A-book model, as these strategies can be challenging for a B-book broker to manage profitably.
  • Risk Management Preferences: Traders who prefer or require certain risk management features, like guaranteed stop-loss orders, might be more suitable for the A-book model.

Why do brokers categorize traders?

Brokers in the Forex and CFD industry categorize traders into different models like A-Book and B-Book primarily for risk management and profitability optimization. This practice is an integral part of their business strategy to ensure sustainability and profitability.

From a risk management perspective, categorizing traders allows brokers to align their internal risk exposure with the trading behaviours and profiles of their clients. For instance, in a B-Book model, the broker takes on more direct market risk as they are the counterparty to client trades. By categorizing traders, brokers can identify which clients are more likely to pose a significant risk if placed in a B-Book model, due to factors like high profitability or trading volume.

For profitability optimization, categorizing traders helps brokers maximize their earnings from various revenue streams. In the B-Book model, brokers can earn from clients’ trading losses, which can be profitable if the client profile indicates a lower likelihood of consistent trading success. Conversely, for more sophisticated or high-volume traders, brokers can earn through spreads or commissions in the A-Book model.

Can traders tell if they were placed in A-Book or B-Book?

It’s generally impossible for a trader to know definitively whether they have been categorized as A-Book or B-Book by their Forex broker. This categorization is part of the internal risk management and business strategy of the broker, and it’s not typically information that they share with their clients.

Is it possible to switch from B-Book to A-Book categorization?

No, it’s not possible for traders to request or choose to be categorized specifically as A-Book rather than B-Book with their Forex broker.

However, a trader’s categorization is not permanent and can change over time. If a trader initially categorized as B-Book shows signs of improvement in their trading – such as increased profitability, higher trading volumes, or more sophisticated trading strategies – they may be re-categorized as A-Book.

filippo ucchino

About The Author

Filippo Ucchino
Co-Founder - CEO - Broker Expert
Filippo is the co-founder and CEO of InvestinGoal.com. He has 15 years of experience in the financial sector and forex in particular. He started his career as a forex trader in 2005 and then became interested in the whole fintech and crypto sector.
Over this time, he has developed an almost scientific approach to the analysis of brokers, their services, and offerings. In addition, he is an expert in Compliance and Security Policies for consumers protection in this sector.
With InvestinGoal, Filippo’s goal is to bring as much clarity as possible to help users navigate the world of online trading, forex, and cryptocurrencies.

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