Proprietary trading, often shortened to “prop trading,” is when a firm trades financial instruments with its own capital to make a profit for itself, rather than executing trades on behalf of clients for commissions and fees. The term covers two related but distinct things today. The original meaning is institutional: a bank or fund trading its own balance sheet. The newer, retail meaning is the “prop firm” model, where an individual trades a firm’s capital after passing an evaluation. This article explains both, because the same words now point at two different worlds.
The Institutional Meaning
In its traditional sense, proprietary trading happens when a trading desk at a financial institution, such as a brokerage, investment bank, hedge fund, or other liquidity provider, uses the firm’s own money and balance sheet to make trades. Instead of earning thin-margin commissions from client activity, the firm trades for its own account and keeps the results. The instruments can be almost anything: stocks, bonds, commodities, currencies, derivatives, and other complex vehicles, and the trades are usually speculative in nature.
Firms do this because they believe they have a competitive advantage that will let them earn a return beating index investing, bond yields, or other approaches. The strategies a prop desk runs vary widely and can include index arbitrage, statistical arbitrage, merger arbitrage, volatility arbitrage, fundamental analysis, technical analysis, and global macro trading.
How an Institutional Prop Desk Works
The defining feature is whose money is at stake. Because the firm is trading its own capital rather than client funds, prop traders can take on greater risk without having to answer to clients, and the firm keeps the full amount of any gains rather than a small commission.
To keep client interests separate, the proprietary trading desk is normally “roped off” from the desks that handle client business. It operates autonomously and is responsible for its own slice of the firm’s revenue, unrelated to client work. That separation also matters for trust, since it helps ensure the institution isn’t trading against the people it serves.
Benefits to the Firm
The institutional case for prop trading comes down to a few advantages:
- Keeping 100% of the gains. Client trading earns commissions and fees, which are a small percentage of the amounts involved. Trading its own capital lets the firm realize all of the profit from a winning position.
- Building a securities inventory. Holding an inventory lets the firm offer clients an advantage and prepares it for slow or illiquid markets when securities are harder to buy or sell.
- Acting as a market maker. A prop desk can provide liquidity in a security or group of securities, stepping in as buyer or seller when a client wants to trade a large or illiquid position and there aren’t many natural counterparties.
The Volcker Rule
Institutional prop trading is also where regulation enters the picture. The Volcker Rule, introduced in response to the 2007 to 2008 financial crisis, restricts large banks from using their own accounts for short-term proprietary trading of securities, derivatives, and commodity futures, along with options on them. The aim is to protect customers by limiting the kind of speculative bets that contributed to the crisis. It’s worth noting that analysts have long pointed out that large institutions tend to obscure the details of proprietary versus client activity, which makes the line harder to see from the outside.
The Retail “Prop Firm” Meaning
Over the past several years, “proprietary trading” has taken on a second, very different meaning for individual traders. A retail proprietary trading firm, commonly just called a prop firm, gives traders access to its own capital to trade, and shares the resulting profits based on performance.
The appeal is the risk profile. Instead of risking a large personal bankroll, a trader buys an evaluation to prove their skill. If they trade well, the firm lets them keep a large share of the profits, often up to around 90%. If things go badly, the downside is generally limited to the fees they paid, and they aren’t on the hook for the firm’s losses beyond that. As one common framing puts it: you bring the skill, the firm brings the capital.
These firms exist largely as a training and filtering mechanism. Historically a trader had to risk their own savings to learn, and this model lets them build the discipline and emotional experience of winning and losing before putting personal money on the line. Many of these firms focus on a specific market, such as a futures prop firm that deals in futures contracts.
How the Retail Model Works
The retail model usually follows a clear sequence:
- The evaluation. You trade in a simulated environment with defined rules: hit a profit target, stay within maximum loss limits, and show consistency. Break a rule and you typically fail, though many firms let you reset and try again for another fee.
- The funded account. Pass the evaluation and you’re given a funded account. Some firms run this as a further simulated stage where the profits are nonetheless paid out for real, and traders may manage more than one funded account at once.
- Payouts. Once funded, you can request payouts of your profits under the firm’s schedule and conditions, keeping your agreed share.
- Scaling. Consistent performance can unlock more capital over time, and some firms move proven traders toward larger or live-funded accounts with higher limits.
Two Meanings, One Term
The throughline between the two senses is the definition itself: trading a firm’s own capital rather than client money. Beyond that they diverge sharply. Institutional prop trading is a bank or fund deploying its balance sheet, often as a market maker, under rules like the Volcker Rule. The retail prop firm model is an individual trading a company’s capital after a paid evaluation, in exchange for a profit split. When someone asks “what is proprietary trading,” the honest answer is to ask which of the two they mean, because the mechanics, the participants, and the risks are not the same.