Maximum position — The largest position a trader may hold at one time, measured across all open trades rather than per trade.
How maximum position works in prop trading
The position limit caps total open exposure on the account. It is normally aggregate, not per trade — three separate two-contract positions count as six against a five-contract cap, and correlated instruments are often counted together. Firms enforce it at the platform level, so an order that would exceed the cap is usually rejected rather than filled and then penalised.
The limit scales with account size and is often the binding constraint before the drawdown is. A trader on a $50,000 account with a five-contract cap and a $2,000 drawdown can risk far less than the drawdown implies, because the position needed to use that budget is not permitted. Check the cap against your intended size before choosing a tier.
Key points
- Measured across all open positions, not per trade.
- Correlated products are frequently aggregated — index futures against their micro equivalents, for instance.
- Usually enforced by order rejection, though some firms treat a breach as a hard failure.
- Often binds before the drawdown does, effectively capping risk below the stated allowance.
Also known as
- max size
- position limit
- max exposure
Frequently asked questions
Does the position limit apply per trade or in total?
Almost always in total across open positions. Some firms also aggregate correlated instruments, so micro and full-size contracts on the same underlying count toward one limit at their equivalent ratio.
What happens if I exceed the maximum position?
Most platforms reject the order outright. Firms that allow the fill typically treat the excess as a breach and may close the account or void the trades. The consequence is stated in the program rules and is not consistent across firms.
Put this into practice
Maximum position is described here as a plain-language educational definition. Firms, platforms, and account programs may apply different conditions or calculations. Verify the current official terms before using this definition to make an account decision.