What Is a Prop Firm?

Prop firms are a large part of the retail futures landscape, and the model has specific mechanics that interact directly with automation.

The traditional model versus the retail model

Historically, a proprietary trading firm employed traders to trade the firm's own capital. Traders were hired, trained, paid a share of profits, and risked the firm's money rather than their own.

The modern retail version is different in structure. A trader pays a fee to attempt an evaluation, demonstrates ability against a set of rules, and on passing is granted an account with a profit split. There is no employment relationship, and the trader's own money is at risk only in the form of fees paid.

Both are called prop firms. They are not the same business, and conflating them causes people to misunderstand what they are buying.

How an evaluation works

Four elements, and the specifics vary by firm and change frequently.

A profit target. A defined amount to reach, often expressed against a nominal account size.

A maximum loss limit. Frequently a trailing drawdown, which is the rule that ends more evaluations than any other and which deserves its own treatment.

A daily loss limit. A per-session cap that is separate from the overall limit.

Additional rules. Minimum trading days, consistency requirements limiting how much of the target can come from a single day, and restrictions around news events.

Breaching any of them typically ends the attempt. Some firms end it immediately; others flatten positions and lock the account until the next session.

The simulated-capital question

This is the fact that most changes how the model should be understood, and it is rarely foregrounded.

Evaluations are simulated. In many programmes the funded account is also simulated, with the firm paying out based on performance in a simulated environment rather than passing your orders to the market. Firm disclosures increasingly state this directly — simulated evaluations, simulated funds.

That has real consequences. Your fills are the simulator's fills, not the market's, which means the slippage you experience may not match what the same strategy would produce live. And your payout depends on the firm's ability and willingness to pay from its own revenue rather than on profits extracted from the market.

It is not inherently improper. It does mean that evaluating a firm is partly about evaluating a counterparty, which is a different exercise from evaluating a broker.

The business model, stated plainly

Firms earn from evaluation fees and from a share of trader profits. The proportion between those two varies and is generally not disclosed.

Where evaluation fees are a significant revenue source, the firm benefits from attempts regardless of outcome. That is not an accusation of bad faith — it is a structural feature, and it explains why evaluations are marketed heavily and why rules that end attempts are strict.

The practical implication is to treat the fee as a cost of the attempt rather than an investment, and to be sceptical of pass-rate figures published by parties with an interest in them.

What this has to do with the PDT change

Worth naming because it changes the calculus.

For 25 years, one of the strongest arguments for the prop model was capital access: a trader with a few thousand dollars could not day trade equities actively under the pattern day trader rule, and a prop evaluation offered a route around that.

That rule was eliminated in June 2026 and replaced with an intraday margin framework, as covered in the post-PDT analysis. Futures never had the restriction at all.

So the access argument has weakened considerably. What remains is leverage on a larger nominal account than your own capital would support, and the ability to risk fees rather than capital. Those are real, and they are narrower than the argument used to be.

Automation and prop firms

The part directly relevant to anyone running software.

Check whether automation is permitted at all. Rules vary considerably. Some firms permit automated strategies, some restrict them, and some prohibit specific categories such as high-frequency approaches or copy trading across accounts. Assuming permission is how people lose accounts they passed.

Trailing drawdown interacts badly with automation. Where the drawdown trails intraday equity including open-position profit, a system that lets a winner give back part of an unrealised gain can breach the limit without ever taking a realised loss. A strategy designed to hold through retracements will fail this rule reliably.

Daily limits must use the exchange trading day. The futures day rolls at the maintenance break rather than midnight, so a counter keyed to the calendar date will not match the firm's accounting.

Your software must enforce the firm's rules, not just your own. The firm's limits are hard boundaries with account-ending consequences, which makes them a harder constraint than your own risk settings. Encode them in the component that places orders.

On a self-hosted deployment those limits live in your own environment, which means enforcing them is your responsibility and no vendor default will do it for you.

What to check before paying for an evaluation

Which drawdown model applies and whether it trails intraday or on closing balances. Whether and when the drawdown locks. Whether automation is permitted for your specific approach. What the payout process and history look like. Whether accounts are simulated. And whether the rules you are reading are current, since firms revise them regularly.

Screenshot the rules on the day you buy. That is unglamorous advice and it is what experienced participants actually do.

The honest limits

A prop evaluation does not make a strategy work. It tests whether a strategy can hit a target under constraints, which is a different question, and the constraints can fail a profitable approach that happens to have the wrong shape.

Fees paid for failed attempts are a real cost that compounds, and the sunk-cost pressure to buy another attempt is the model's most predictable psychological trap.

Simulated fills are not market fills, so passing an evaluation is not proof a strategy survives live execution.

And the firm's rules bound your account, not your risk. Position sizing bounds your risk — capital divided by twenty as the ceiling on any single position, under the divide-by-20 rule — and it is worth applying to a funded account exactly as you would to your own money.

Frequently asked questions

What is a prop firm? A firm giving traders access to capital in exchange for a profit share. In the retail futures model you pay for an evaluation and, on passing, receive a funded account.

Are prop firm accounts real money? Evaluations are simulated, and in many programmes funded accounts are simulated as well, with payouts made from firm revenue. Check the firm's disclosures.

How do prop firms make money? From evaluation fees and a share of trader profits. Where fees are significant, the firm benefits from attempts regardless of outcome.

Can I use automated trading at a prop firm? It depends entirely on the firm. Some permit it, some restrict it, and some prohibit certain categories. Verify before paying.

Did the PDT change affect prop firms? It weakened the capital-access argument for equities. Futures never had the restriction, so the futures prop case rests on leverage and risking fees rather than capital.

Disclaimer: This article is educational content about trading mechanics and software. It is not investment advice, financial advice, tax advice, legal advice, or a recommendation to buy or sell any security or futures contract, nor a recommendation of any strategy, platform, broker, or firm. Any contracts, specifications, figures, or firm rules named are described for illustration and are subject to change without notice. Futures and options trading involve substantial risk of loss and are not suitable for all investors; futures are leveraged and losses can exceed the amount deposited. Please read Characteristics and Risks of Standardized Options before trading options. Automated trading carries additional risks including software defects, connectivity failures, missed or duplicated signals, broker API changes, and outages that may prevent orders from being placed, modified, or cancelled. Past performance does not indicate future results, and no configuration, position-sizing rule, or risk setting can guarantee a profit or prevent a loss.

StaxInvesting LLC sells self-hosted trading software. It is not a broker-dealer, futures commission merchant, investment adviser, proprietary trading firm, or financial institution, and it does not manage accounts, hold member funds, place trades on behalf of members, or access member brokerage accounts. Members run the software in their own cloud environment, connect their own brokerage accounts under their own credentials, and are solely responsible for their configuration, their credential security, their compliance with any third-party terms or firm rules, and every trade executed in their account. Exchange specifications, firm rules, and platform details described here reflect publicly available information as of publication and change frequently; always verify against current official sources. Consult a qualified financial adviser, tax professional, and attorney regarding your individual circumstances.