A-book

Last verified 5 Nov 2025·How we review

An A-book is a term used in the forex trading industry to describe a brokerage model where the broker passes the client’s trades directly to the liquidity providers or interbank market, therefore not taking the opposite side of the client’s trade. This model promotes transparency and aligns the broker’s interests with those of their clients.

What it means

In the A-book brokerage model, when you place a trade, the broker sends your trade to a third party, which is usually a bank or another financial institution, that acts as the liquidity provider. This means your trades are executed in the real market, allowing for more transparent pricing and execution. The broker earns money primarily through commissions or spreads without betting against their clients.

Why it matters

Understanding whether a broker uses an A-book or B-book model is crucial for traders because it can significantly affect how their trades are handled and the potential for conflicts of interest between the trader and broker. The A-book model is often seen as the more transparent and fair approach since the broker does not profit from trading losses of their clients.

How it works

1. Trade Placement: You place a trade with your broker.
2. Order Matching: Instead of taking the opposite side of your trade, the broker forwards your order to one or several of its liquidity providers.
3. Execution: The liquidity provider fills your order at the best available price, and your broker confirms the trade with you.

This process ensures that your trades are executed in the actual market, providing more accurate pricing and transparency.

Common use cases or examples

• Scalping and High-frequency Trading (HFT): Traders who rely on these strategies prefer A-book brokers because of the superior execution speed and access to real market conditions.
• Institutional Trading: Large institutional traders often use A-book brokers to access deeper liquidity and better accommodate their large volume trades.
• Professional Forex Trading: Professional traders who manage large accounts or trade for clients may opt for A-book brokers for enhanced transparency and fairness.

Benefits and potential risks

Benefits:

• Transparency: You see the real market prices and depth, reducing the chance of price manipulation.
• Alignment of Interests: Since the broker makes money from spreads or commissions regardless of trade outcomes, their success is aligned with yours.
• Better for Certain Strategies: Strategies that depend on accurate execution and accessing market depth are more viable with A-book brokers.

Potential Risks:

• Market Risk: You are exposed to the actual market, which can sometimes mean more volatility and less predictability in pricing.
• Costs: A-book brokers might charge higher commissions or require larger deposits compared to B-book brokers.

The A-book model represents a brokerage approach built on transparency, where the broker facilitates direct access to the liquidity providers, ensuring that clients’ trades are executed in the real market. This model is particularly suitable for traders seeking fair conditions, reliable execution, and an alignment of interests with their broker. However, it’s important to consider the potential increased costs and market risks associated with trading in the actual interbank market. Understanding the distinction between A-book and B-book models is essential for making informed decisions about which broker to trade with, depending on your trading style and strategy preferences.