Market Maker (Dealing Desk)
The Formal Definition
A broker (often called a B-Book operator) that takes the counterparty position on client trades rather than passing orders directly to external interbank liquidity providers.
Broker Profit = Client Net Trading Losses + Bid-Ask Spread Markup
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Dealing-desk brokers run an internal book. When you click buy, they don't route that order to an open exchange—they take the sell side of your trade. When you lose money, it goes directly onto their corporate balance sheet."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: Retail Trader Losing $2,000 on Leveraged CFD Contracts
| Execution Metric | A-Book STP/ECN Broker | B-Book Dealing Desk Operator |
|---|---|---|
| Fee / Rate | $5.00 Ticket Commission | $0.00 'Free' Commission |
| Spread / Buffer | Neutral Order Pass-Through | Counterparty Exposure |
| Execution / Status | Trade filled by external Tier-1 bank | Broker internalized the entire position |
| Total Cost / Result | Broker earned only the $5.00 commission | Broker booked your entire $2,000 loss as profit |
How Brokers Weaponize This Term
Dealing-desk models create an inherent conflict of interest: the broker profits when the client loses. This structure can incentivize aggressive stop-hunting, synthetic price spikes, and selective execution delays on profitable traders.
Broker Evaluation Matrix
Cole Approves
Interactive Brokers: Direct agency model with zero internal dealing-desk counterparty conflict.
Read Audit →Cole Flags / Avoids
Unregulated Offshore CFD Providers: B-Book dealing-desk operations configured to profit directly from client liquidation.
View Trap Details →Frequently Asked Questions
Are all dealing-desk market makers inherently bad?
No. Reputable regulated market makers provide continuous liquidity in quiet markets, though the fundamental counterparty conflict remains present.
How can I verify if my broker is routing orders via A-Book or B-Book?
Check their regulatory RTS 28 order-execution disclosure documents, which explicitly detail execution venues and internalized order flow percentages.