How CFD Brokers Really Manage Client Trades: Beyond A-Book and B-Book

Short answer

The standard explanation is straightforward. An A-book broker passes a client trade to a liquidity provider for hedging, whereas a B-book broker holds the exposure and can gain when the client incurs losses.

That description works as a rough introduction, but it does not reflect how most established CFD brokers actually handle risk. A CFD broker remains the contractual counterparty to the client. Independently, the broker may match opposing client orders, hedge some or all of its remaining net risk externally, or hold a controlled portion of risk within set limits.

In reality, many well-known CFD brokers operate a hybrid or portfolio-level risk approach. They oversee the aggregate exposure from thousands of trades instead of routing every single order to a liquidity provider or taking the opposite side of each client wager.

Base Markets provides a practical case. It handles exposure largely at the aggregate portfolio level, weighing the total client book, internally netting opposing positions, and addressing the remainder through external hedging and controlled risk retention. Base's choice to offset, hedge, or hold the residual exposure does not by itself alter the pricing and execution terms for the client's account.

That difference is significant. The key considerations are not whether a broker uses a trendy label, but whether its pricing is transparent, its execution is equitable, its risk is managed, and it can honor withdrawals when clients are in profit.

What this guide addresses

This guide details:

• the common industry definitions of A-book and B-book
• the legal and operational events when a CFD trade is initiated
• how internalisation, netting, and external hedging operate together
• where authentic conflicts of interest may appear
• what traders should ask a broker before depositing funds
• how Base Markets implements these principles in practice

A-book and B-book: the standard view

In retail trading, A-book and B-book are informal industry designations. They are not exact legal categories, and different brokers may apply them differently.

What A-book typically means

An A-book model is often referred to as straight-through processing (STP). The broker takes a client order and places an equivalent hedge with a bank, prime broker, non-bank market maker, or another liquidity source.

If a client purchases 10 lots of EUR/USD, the broker buys 10 lots externally. The client's gains or losses are largely matched by the external hedge, leaving the broker to generate revenue through commission, spread markup, financing, or other stated fees.

This is frequently promoted as if the client's trade itself goes into the market. For an over-the-counter CFD, that characterisation is incomplete. The client's agreement remains with the broker. The external transaction is the broker's own hedge of the exposure stemming from that contract.

What B-book typically means

A B-book model is often described as the broker keeping the risk. If the client purchases 10 lots, the broker does not necessarily create an equivalent external hedge. The broker remains financially exposed to the client's outcome.

If the client loses, the retained client trading losses may advantage the broker. If the client wins, the broker must pay the profit from its own funds. This introduces a potential conflict, but it does not automatically indicate that the client received unfair pricing or execution.

The basic comparison

What occurs when you trade a CFD?

When a client purchases a CFD, the broker becomes the contractual counterparty to that CFD. The client is not typically acquiring the underlying currency, index, commodity, or share from the external market. The broker determines the client's profit or loss based on the relevant market price and settles the CFD under its terms.

The trade generates market exposure for the broker. The broker then decides how to manage that exposure. It may:

• offset it against a client position in the opposite direction
• hedge it with one or more external liquidity providers
• retain it temporarily or permanently within an approved risk limit
• use a combination of all three

These are risk-management choices made behind the client agreement. They should not influence whether the client obtains fair pricing, suitable execution, or access to legitimate profits.

This is why claims like "your order is sent directly to the market" should be examined closely. They may describe the broker's hedging process, but they do not change the legal nature of an OTC CFD. Terms such as ECN, STP, agency, A-book, and B-book can be useful shortcuts, but none of them replaces a clear explanation of who the counterparty is and how the broker manages exposure.

One client, two clients, and thousands of clients

The mechanics become clearer when seen at portfolio level.

One client buys 100 lots

Assume one client buys 100 lots of EUR/USD and no other relevant positions exist. A broker wishing to avoid the directional risk can buy 100 lots from a liquidity provider.

Suppose, purely as an example, the client pays USD 7 per lot round turn and the external hedge costs the broker USD 5 per lot. The broker's gross difference is USD 2 per lot before technology, staffing, regulation, payments, bad debt, financing, and other operating costs.

The key commercial point is that a sustainable broker does not require the client to lose. It can generate a fair amount from repeated trading activity. A profitable client who continues trading for years can be more valuable than a client who loses a USD 500 balance once and departs.

For Base, the preferable commercial outcome is to earn a fair amount from a client who trades for years, rather than realise a larger one-off gain when that client loses everything and leaves.

Base applies that principle through transparent pricing. On FX, Base Zero charges USD 2 per side, or USD 4 round turn per standard lot. The commercial goal is recurring, clearly disclosed trading revenue and a long-term relationship, not reliance on an individual client's loss.

One client buys 100 lots and another sells 100 lots

Now assume one client is long 100 lots and another is short 100 lots in the same instrument. Their positions create no net directional exposure for the broker at that point.

If the market rises, the broker owes the long client and receives the corresponding loss from the short client. If the market falls, the economic result reverses. The broker essentially administers the two contracts and charges each client the disclosed trading costs.

Hedging both positions separately would incur external commission, spread, financing, and margin costs without reducing the broker's net market risk. Internally offsetting them is therefore not automatically a trick or a bet against either trader. It is a sensible way to manage a portfolio.

This process is typically called internalisation or netting. It can enhance the broker's economics and reduce unnecessary reliance on external liquidity. It can also provide extra capacity because the broker does not need to send two offsetting positions into the market simply to cancel them out.

Thousands of clients trade continuously

Real broker books are far more fluid. Thousands of clients open, close, increase, reduce, and reverse positions across many instruments and time frames. Some exposures offset immediately. Others remain unmatched for seconds, hours, or longer.

Imagine clients are collectively long 1,000 lots and short 1,000.01 lots. The broker's net exposure is only 0.01 lots. It may decide that this difference is too small to hedge efficiently, is within its risk tolerance, or is likely to be offset by the next incoming order.

Now imagine the book is long 1,000 lots and short 900 lots. The broker has a net long exposure of 100 lots. It can hedge all of that residual, hedge part of it, or retain it within approved limits. The decision may depend on volatility, liquidity, concentration, event risk, available LP credit, and the broker's capital.

This portfolio approach explains why a broker's headline hedging percentage can be misleading. In the 1,000-lot long and 900-lot short example, hedging 100 lots represents only 5.3% of the 1,900 lots of gross positions, but it represents 100% of the broker's net directional exposure. The denominator matters.

It also explains why asking whether a particular trade was A-booked or B-booked may give a false sense of certainty. An individual client position can be internally offset today, part of an external portfolio hedge a moment later, and offset again as the book changes.

How CFD brokers generate revenue

A broker can earn income from several sources, including:

• commission charged per lot or as a percentage of value
• a disclosed markup within the spread
• overnight financing charges
• currency conversion and other clearly stated fees
• the net result of market exposure retained by the broker

The first four sources can sustain a straightforward, repeatable business. A broker offers access, technology, execution, risk infrastructure, payments, and service in exchange for transparent charges.

Retained exposure is different because its outcome varies with client performance and the market. It can produce gains or losses for the broker. A properly managed firm treats that as a controlled portfolio risk, not as permission to interfere with a client trade.

Why internalisation is not automatically harmful

Internalisation is sometimes portrayed as evidence that the broker is trading against its clients. That is too simplistic.

The broker is already the contractual counterparty to the CFD. Whether it hedges the resulting exposure is a separate treasury and risk decision. If opposing client positions naturally offset, avoiding two unnecessary external hedges can reduce transaction costs, LP margin requirements, and operational friction.

It can also make more liquidity available to clients than the broker could obtain from a single external venue at a particular moment. The broker can combine internal flow with multiple liquidity providers and use its own risk capacity to support execution.

The client should focus on the outcome: Was the price derived fairly? Was the order handled consistently? Was any slippage genuine and applied according to disclosed rules? Can the broker meet the resulting obligation if the client wins?

Internalisation becomes problematic when the broker's economic interest in a client loss starts to influence those answers.

Where the conflict becomes unacceptable

A retained-risk model creates a potential conflict because the broker may benefit financially when clients lose. Potential conflicts exist in many financial businesses. The test is how they are managed.

The line is crossed when a broker uses its control over the trading environment to create or increase client losses. Warning signs can include:

• unjustified or consistently asymmetric slippage
• prices that deviate materially from credible market references without explanation
• arbitrary spread widening unrelated to market conditions
• selective delays or rejection of profitable orders
• cancellation of legitimate profitable trades after the fact
• withdrawal obstruction or pressure to keep funds in the account
• different execution treatment based on whether the client is winning

These are not theoretical issues. Regulators have pursued CFD businesses for systemic unconscionable conduct involving manipulation of client trades and obstruction of withdrawals. One documented example is the Australian Securities and Investments Commission's 2024 Federal Court case.

The lesson is not that every broker retaining exposure behaves improperly. It is that execution controls, financial strength, governance, and withdrawal conduct matter more than a marketing label.

Why the broker's capital matters

External hedging requires capital. A broker may offer a client 500:1 leverage while receiving only 100:1 from its liquidity provider.

For a simplified USD 100,000 position, the client may post USD 200 of margin at 500:1. To create the same external hedge at 100:1, the broker may need to post USD 1,000 with its LP. That is five times the client's margin. The USD 1,000 is collateral committed while the hedge remains open, rather than a trading cost, and is normally released when the hedge is closed. At 100 lots, the simplified requirement becomes USD 20,000 from clients against USD 100,000 at the LP.

Actual requirements vary by asset, counterparty, concentration, volatility, and credit arrangement, but the principle is important. A broker can promise high leverage more easily than it can fund a large hedging programme.

Retaining exposure also requires financial strength. If clients are profitable in aggregate, the broker must pay them. Sharp events such as the removal of the Swiss franc floor in 2015 can create concentrated gains and losses quickly. A weak broker may respond by delaying withdrawals, disputing legitimate trades, asking clients not to withdraw, or failing altogether.

Base Markets is majority-owned by an investment fund. That financial backing matters because external hedging requires properly funded LP accounts, while retained exposure requires the broker to have sufficient liquidity to meet profitable client positions and withdrawals.

Financial backing is not a substitute for risk controls, and regulation is the starting point rather than the entire story. It does, however, help distinguish a broker built to operate through difficult markets from one dependent on the next wave of client deposits.

Can you identify an A-book or B-book broker from the platform?

Not reliably.

Variable spreads, commission-based accounts, positive or negative slippage, re-quotes, fast execution, and MT5 Depth of Market do not prove whether the broker hedged the resulting exposure externally. Those features may indicate something about pricing or execution, but they do not reveal the broker's complete risk book.

A "raw" account does not prove agency execution. A fixed spread does not prove B-booking. A liquidity-provider logo does not show which exposures are hedged, when they are hedged, or in what amount. Even a broker that hedges extensively may aggregate transactions rather than replicate each client order one for one.

The better approach is simpler: ask the broker.

Traders should not need to conduct forensic analysis on an MT5 account to understand a broker's business model. They should be able to ask the broker and receive a straight answer.

Useful questions include:

1. Are you the contractual counterparty to my CFD?
2. Do you manage exposure at individual trade or aggregate portfolio level?
3. Do opposing client positions offset internally?
4. How do you manage residual exposure and concentration risk?
5. Does execution or pricing change according to how my exposure is managed?
6. What are the total trading costs, including commission, spread, financing, and conversion?
7. How are client funds held, and what is the normal withdrawal process?
8. Who owns and finances the brokerage?

A credible broker may not publish its liquidity counterparties, hedge thresholds, or real-time exposure. Those can be commercially sensitive risk-management details. It should still be able to explain its model clearly, identify its regulator and legal entity, publish its charges, and describe how it handles execution and withdrawals.

Separately agreed institutional hedging arrangements may be considered where legally, operationally, and commercially appropriate, subject to liquidity, margin, volume, and reporting requirements.

How Base Markets applies the model

Base Markets is regulated by the Financial Services Commission of Mauritius under licence number GB25204723.

Base's approach can be summarised plainly:

• Base is the contractual counterparty to client CFDs.
• Opposing client positions may be internally offset at aggregate level.
• Residual exposure is externally hedged or retained within defined risk limits.
• Base's decision to offset, hedge, or retain the resulting exposure does not, in itself, change the pricing and execution terms applicable to the client's account.
• Base manages exposure primarily at aggregate portfolio level and does not alter a client's applicable pricing or execution solely because the client is profitable or because the resulting exposure is hedged or retained.
• The preferred commercial model is transparent trading revenue from clients who continue to trade.

This is consistent with the broader Base proposition. The firm competes on clear total pricing, credible liquidity, execution oversight, straightforward funding and withdrawals, and access to people who understand the trading environment.

It does not claim that trading is easy or that clients will necessarily be profitable. CFDs are high-risk products and most retail traders lose money. The point is narrower and more important: a broker does not need to design its business around making an individual client fail.

Four common myths

Myth 1: A-book means there is no conflict

An external hedge can reduce market risk, but the broker still controls pricing, execution rules, margin, and the client relationship. A label does not guarantee good conduct.

Myth 2: B-book means the broker is manipulating trades

Retaining exposure creates a potential conflict, not proof of abuse. Fair pricing, consistent execution, adequate capital, and reliable withdrawals remain the proper tests.

Myth 3: Raw spreads or MT5 Depth of Market prove A-book execution

They do not. They show elements of the client trading environment, not the broker's complete aggregate exposure or external hedge activity.

Myth 4: A low hedge percentage means most client trades are being bet against

Not necessarily. Gross client positions may offset substantially. A small hedge as a percentage of gross volume can cover all of the remaining net directional risk.

Frequently asked questions

Is A-book always safer than B-book?

No. The label alone does not establish financial strength, execution quality, governance, or withdrawal reliability. A poorly capitalised A-book broker can still fail, while a well-capitalised hybrid broker can manage risk responsibly.

Does a broker profit when I lose?

It may benefit from losses on exposure it retains, but it may also lose when retained clients win. Many brokers earn primarily from spreads, commission, financing, and other fees while managing aggregate market exposure separately.

Does internalisation affect my price?

It should not result in unfair treatment. Base's decision to offset, hedge, or retain the resulting exposure does not, in itself, change the pricing and execution terms applicable to the client's account.

Can I see whether my exact trade was hedged?

Usually not from a retail platform. Hedging may occur at aggregate portfolio level and may change as other clients trade. Ask the broker how its overall process works.

Why would a broker retain any exposure?

Tiny residual positions may be uneconomic to hedge, offsetting flow may arrive quickly, and limited exposure may fall within an approved risk appetite. The issue is whether the risk is controlled and adequately funded.

What should make me cautious?

Unclear total costs, unexplained execution differences, withdrawal pressure, evasive answers about the legal entity or regulator, and extravagant promises unsupported by the actual trading product should all prompt further investigation.

Conclusion: judge the broker, not the label

A-book and B-book are convenient shorthand, but they often obscure more than they reveal. A CFD broker remains the client's counterparty. Behind that contract, the broker can offset client flow, hedge externally, retain controlled exposure, or combine all three.

The real dividing line is not between a pure A-book and a pure B-book. It is between brokers that manage exposure professionally and treat clients fairly, and brokers that use opaque pricing, weak capital, or withdrawal obstruction to protect themselves.

Base Markets offers a direct version of the hybrid model: aggregate the book, offset opposing flow, manage the residual, keep risk-management decisions separate from the pricing and execution terms applicable to each client's account, and earn transparent revenue from long-term trading activity.

For traders, the practical test is equally direct. Understand what you pay. Assess the execution you receive. Ask how the broker manages risk. Check who regulates, owns, and finances it. Then judge whether it behaves like a business built to be there when markets, and clients, are profitable.

Risk warning: Trading CFDs carries a high level of risk to capital and may not be suitable for all investors. Trade only with money you can afford to lose, ensure you understand the risks, and seek independent advice where necessary.