The two revenue models
A modern proprietary trading firm — the retail-facing "funded trader" kind — earns from two distinct sources. Understanding them separately is the key to understanding the business.
The first is fee revenue. Before a trader is given a funded account, they typically pay to attempt an evaluation or challenge: a simulated test with a profit target and strict risk rules. Firms also collect reset fees when a trader breaches a rule and restarts, and in some cases subscription or data fees. This income is collected up front and does not depend on how anyone subsequently trades.
The second is trading revenue. When a trader passes and is funded, the firm and the trader split the profits the trader generates, and the firm keeps its share. Alongside that, the firm retains the net financial result of the accounts it chooses to keep on its own book rather than hedge externally. Trading revenue is real but variable — it rises and falls with how funded traders actually perform.
Which model dominates — challenges or trading?
For most retail-facing firms, challenge and evaluation fees are the larger and steadier line. Fee income scales directly with how many traders attempt evaluations, is collected before any trading outcome is known, and is therefore predictable. Because a large share of entrants do not pass, or do not remain profitable once funded, the aggregate of many small fees tends to outweigh the more erratic trading result.
That does not mean a healthy firm depends on traders failing. A sustainable model treats fees as the base and manages the funded population so that successful traders are a feature, not a threat — which is where risk management and liquidity come in. A firm whose survival requires most traders to lose is fragile and, increasingly, a reputational and regulatory liability.
| Revenue source | Where it comes from | Predictability |
|---|---|---|
| Challenge / evaluation fees | Up-front fees to attempt a funded-account test; reset and subscription fees. | High — collected before trading, scales with sign-ups. |
| Profit-split share | The firm's percentage of the profits generated by successful funded traders. | Variable — depends on funded-trader performance. |
| Internalised trading result | Net result of accounts kept on the firm's own book (B-book) rather than hedged. | Volatile — a genuine trading risk the firm carries. |
Illustrative, structural breakdown. The mix varies widely between firms and is not a claim about any specific operator.
A-book vs B-book economics
Once traders are funded, the firm faces a live risk-management choice for every position: hedge it or hold it. This is the A-book versus B-book decision, and it sits at the centre of prop-firm trading economics.
Running an A-book means passing selected flow through to a liquidity provider, so the firm's exposure is hedged in the market and it earns from the structure of the arrangement rather than from the trader's loss. Running a B-book means internalising the flow — keeping the position on the firm's own book, so the firm gains when the trader loses and loses when the trader wins. Most firms operate a hybrid: they route flow they judge likely to be profitable or that carries unwanted risk out to a liquidity provider, and internalise the rest. Get that split wrong and a run of successful traders can turn an internalised book into a serious loss.
Where liquidity and risk transfer fit
The trading side of a prop firm is, in the end, a risk-management operation, and risk management needs somewhere to send risk. That is the function of a liquidity and hedging partner. When a firm decides a block of exposure should not sit on its own book, it hedges the position with a liquidity provider — transferring the risk it does not want to hold and locking in a known cost instead of an open-ended trading outcome.
This is why the choice of liquidity partner shapes the economics, not just the plumbing. Access to deep, reliable pricing lets a firm hedge precisely and at scale; thin or unreliable liquidity forces it either to over-internalise (taking on risk it would rather transfer) or to hedge at a poor price. Purpose-built prop-firm liquidity is designed for exactly this — giving a firm the tools to pass through, hedge and monitor funded-trader flow in real time.
Why the funding model matters
Put together, the picture is clear: fees provide the base, and disciplined risk transfer determines whether the trading side adds to profits or erodes them. A firm that leans on fees while hedging its unwanted exposure through a capable liquidity partner has a durable model; one that quietly relies on internalising flow in the hope that traders lose is exposed the moment they do not. For a wider view of the mechanics, see how prop firms work, and the glossary for the terms used here.