A-Book, B-Book and Hybrid Models: Forex Licensing Guide

Quick answer: identify the legal role before choosing a model

A-Book, B-Book and hybrid are industry descriptions of execution and hedging arrangements, not universal licence categories. The licensing analysis starts with the products offered, the countries and types of clients served, the client’s contractual counterparty, the risks retained by the firm, and who receives or controls client money.

Hedging every client trade does not necessarily make a broker an agent. Retaining exposure does not, by itself, determine whether a business is lawful. Contracts, order flows, money flows and permissions must agree. This guide focuses on retail over-the-counter forex derivatives and contracts for difference (CFDs), rather than treating currency exchange, securities brokerage and digital-asset services as interchangeable.

Last verified: 21 September 2026. This article provides general information and practical planning suggestions, not jurisdiction-specific legal advice. UK and Australian examples illustrate the analysis; they do not establish the rules in other countries.

How do A-Book, B-Book and hybrid models differ?

Model	Typical risk treatment	Questions that remain
A-Book	Hedge individual trades or aggregated exposure with external liquidity providers (LPs)	Whether the broker remains the client’s counterparty; hedge latency, rejected orders, basis and LP credit risk
B-Book	Act as counterparty and retain some or all net exposure internally	Relevant permissions, capacity to absorb market risk, fair pricing and conflicts management
Hybrid	Combine external hedging and retention under approved product, exposure and risk rules	Explainable routing, controlled changes and permissions covering every activity actually undertaken

These labels do not have a single technical definition across providers. One firm advertising “100% A-Book” may hedge every execution immediately; another may net client positions before hedging. An application should describe the actual process, rather than relying on marketing terminology to communicate how risk is managed.

Why can an A-Book broker still need principal permissions?

Consider a client entering a CFD with a broker, followed by the broker entering an opposite transaction with an LP. The economic risk may be substantially offset, but the client contract and hedge contract remain separate legal relationships. An STP or ECN label does not make the client a direct contractual customer of the LP.

The UK FCA’s PERG 13 guidance explains that matched-principal, back-to-back execution can involve both dealing on own account and executing client orders. Separately, ASIC’s Australian retail OTC derivatives guidance states that CFD issuers typically require market-making authorisation even when using third-party prices. These are jurisdiction-specific examples of why hedging ratios and price sources cannot replace an analysis of legal capacity.

Map a transaction from quotation and acceptance through execution, hedging and settlement. Identify the entity, contract and timing at each step. If the client trade can execute before a hedge is accepted, document how the temporary exposure is measured, who owns the incident and what prevents further uncontrolled risk if hedging fails.

What conflicts need attention in B-Book and hybrid operations?

An unhedged position can create opposing trading outcomes for the broker and client. Its legal treatment still depends on permissions, products and conduct. The FCA identifies conflicts inherent in CFD business models and customer interests as supervisory concerns. A contractual statement that the firm may act as counterparty does not, on its own, demonstrate effective controls.

• Pricing and execution: establish reviewable rules for quotations, slippage, rejections and erroneous prices; compare actual outcomes with disclosures.
• Incentives: examine sales, dealing-desk and introducer remuneration. Encouraging unsuitable trading or client losses should not become the operating objective.
• Routing authority: record who can change client groups, hedge ratios or limits. Material changes need independent review rather than unrestricted individual discretion.
• Complaints and remediation: retain data sufficient to reconstruct disputed executions and investigate unfair outcomes.

This is a practical control checklist, not a claim that every country mandates identical procedures. Routing criteria also need review against applicable execution, fair-treatment and data-use obligations. A client’s profitability is not a justification for unfair execution.

Map the business to permissions before applying

Fact to establish	Supporting evidence	Unsafe shortcut
Client counterparty and execution capacity	Client agreement, LP contracts and order lifecycle	A bridge connection means the broker is only an agent
Exposure retained by the firm	Net-risk reports, hedge timing, limits and exceptions	A flat end-of-day book means no intraday risk
Receipt and control of client funds	Account purposes, bank and PSP agreements, reconciliations and withdrawals	External hedging automatically segregates client money
Products, client types and acquisition countries	Product list, target-market analysis and marketing restrictions	One licence permits worldwide solicitation
System operation and incident ownership	Responsibilities, outsourcing scope, access controls and exercises	A white-label platform transfers its provider’s licence

After local advisers confirm the activity perimeter, select the permission category and relevant limitations. In a multi-entity group, the contracting name, payment recipient, website disclosure and trading records should tell a consistent story. Our forex broker company-structure guide explains how to document the entities and their responsibilities.

How should capital, costs and launch timing be assessed?

There is no universal “A-Book capital price” or “B-Book approval period”. UK MIFIDPRU 4 distinguishes initial capital from ongoing own-funds requirements, with the applicable calculation depending on the firm’s classification. Other jurisdictions require their own analysis of rules, permissions and conditions; UK figures and calculation methods should not simply be transplanted.

For planning, separate four funding buckets: regulatory capital, funds needed for LP margin or credit arrangements, operating cash, and client money protected under applicable rules. They are not interchangeable. Client balances should not be treated as the firm’s own capital, and cash already committed elsewhere should not be counted twice as freely available liquidity.

• An A-Book budget should include bridging and aggregation, LP minimum charges, hedge costs, variable margin needs and backup connectivity.
• A B-Book or hybrid proposal should also assess risk staffing, real-time limits, stress testing, pricing surveillance and independent oversight.
• All models need compliance, audit, insurance where applicable, record retention, client support and fixed costs during launch delays.

Authorisation, banking, LP onboarding and technical deployment are connected but separate workstreams. Give each its own prerequisites, owner and completion evidence. A vendor’s installation date is not necessarily a date on which the business may legally start. See our regulatory capital monitoring guide for an operating approach to buffers and escalation.

What model-specific application materials should be prepared?

A generic policy pack is insufficient for explaining a distinctive operation. Assemble a permissions map, summaries of client and LP contracts, order and money-flow diagrams, base and stress financial forecasts, execution and conflicts policies, risk limits, supplier exit arrangements, and evidence that the responsible people can actually operate the systems.

Test lower trading volumes, increased LP charges, worse hedge slippage and concentrated client positions separately. Persistent client losses should not be assumed to produce dependable revenue. Low historical volatility does not demonstrate that the firm can meet capital and liquidity needs during a rapid price gap. Our forex licence business-plan guide covers the wider application structure.

What should be tested before launch?

Exercise	Expected operational result	Evidence to retain
LP rejects orders or disconnects	Residual exposure is identified; fallback handling and controls on new risk work	Incident timeline, exposure record and escalation notices
Sharp movement in one product	Limit alerts, hedging and funding arrangements function	Stress assumptions, decisions and funding availability
A routing rule is changed	Approval, version control and rollback function	Change owner, reviewer, tests and effective time
A client disputes an execution	The firm can reconstruct the quote and order	Price source, server times, execution logs and investigation outcome

These are suggested acceptance exercises, not a universal regulatory testing standard. Assign owners to weaknesses and retest them. A firm should not claim full external hedging while leaving post-failure internal exposure unmanaged.

Can an already licensed broker switch to hybrid routing?

Do not change platform parameters first and review permissions later. Compare the proposed operation with existing permissions, restrictions and the business plan supplied to the regulator. Determine whether prior approval, notification or a capital adjustment is required. Review client terms and bank, LP and technology contracts as well. Potentially out-of-scope activity should not begin before local requirements are resolved.

The right model is the one the business can operate lawfully, transparently and with sustained control—not the one with the most attractive label. A useful next step is a one-page factual brief listing products, target clients, contracting entity, hedge method, money accounts and system owners. That gives a licensing discussion a concrete starting point.

Frequently asked questions

Does an A-Book broker only need an agency licence?

Not necessarily. A broker can become the client’s contractual counterparty before hedging each trade. Permissions must follow contracts and actual activities, not the A-Book label alone.

Is B-Book automatically illegal?

No conclusion follows from the label alone. Check products, client countries, permissions, execution conduct and conflicts controls. Unauthorised activity or unfair client treatment can create serious problems.

Does full hedging eliminate every risk?

No. Delays, rejected hedges, price differences, LP default and operational failures remain possible. The firm still needs to monitor residual exposure and liquidity needs.

Does a white-label platform include a licence?

Do not assume so. A technology contract normally does not replace the authorisation needed for the activities undertaken. Identify who contracts with clients, provides regulated services, receives money and bears responsibility.

Can hybrid routing rules be changed at any time?

Uncontrolled changes are inappropriate. Review permissions and disclosures, retain approved versions and test records, and monitor client execution outcomes and risk after each change.

Which model is fastest and cheapest to license?

There is no universal answer. Jurisdiction, actual activities, client-money arrangements, staffing, application completeness, and bank and LP conditions all affect funding and launch timing.

Can client money fund the broker’s external hedges?

Do not assume it can. Review applicable client-money rules, agreements and account purposes. Distinguish client money, the firm’s own funds and LP margin; an A-Book model does not permit them to be mixed automatically.

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