Prop firm lot and contract limits explained: how big can one trade be?
Some firms cap lots per trade, some cap contracts per account size, and some cap risk instead of size. Here is how position limits differ across the firms we track — and why they matter more than leverage.
Most traders check the profit target and the drawdown before buying a challenge. Far fewer check the maximum position size — until an order gets rejected, or a single oversized trade gets flagged in a risk review.
Firms limit size in three quite different ways. This neutral explainer walks through each one using the firms in our dataset. Always confirm the current limit for your exact product and account size on the firm's own rules pages.
1. Hard lot caps per trade (CFD firms)
A few CFD firms put a fixed ceiling on how many lots a single order can carry:
- E8 Markets: a maximum of 50 lots per trade, with gold (XAUUSD) capped lower at 20 lots.
- FundingPips: a 20-lot-per-trade cap on a $50K account, enforced at platform level and scaled with account size (we flag this as unverified).
- Alpha Capital Group: caps scale with account size — from 2.5 lots on $5K up to 80 lots on $200K on Alpha One/Pro. The Alpha Swing product halves those figures.
The Alpha Swing detail is a good reminder: two products under the same brand can have very different size limits.
2. Contract limits by account size (futures firms)
Futures firms almost always cap the number of open contracts, and the cap grows with the account:
- Topstep: 5 minis on $50K, 10 on $100K, 15 on $150K (10 micros count as 1 mini).
- Apex Trader Funding: 4 minis on $25K up to 12 minis on $150K, with a contract ramp on the funded account.
- Take Profit Trader: 3 minis on $25K up to roughly 15–17 minis on $150K (sources conflict at the top size).
- For Traders: no explicit cap on its forex/crypto accounts, but its futures accounts carry max position size limits.
Because futures contracts have fixed tick values, these caps effectively set your maximum dollar risk per point. See our futures vs CFD explainer for why the two models feel so different.
3. No size cap — but a risk cap instead
Many firms publish no fixed lot limit at all, and instead restrict how much you can lose on a trade or across open positions:
- Upcomers: per-trade risk caps on funded and instant accounts — for example 3% on Thunderbolt/Phoenix/Astral funded, 2% on Vanguard/Oracle instant, and 1% on Supernova/Hypernova.
- Blueberry Funded: around 1.5% risk per trade on funded accounts, with martingale strictly prohibited.
- Fintokei: a -3% maximum risk on open trades, plus leverage limits.
- BrightFunded: per-instrument notional caps (on $100K, e.g. $10M forex, $2M indices, $500K crypto).
- FTMO and City Traders Imperium: no fixed lot cap surfaced; size is policed through the loss limits and "excessive sizing" / over-leveraging rules.
A risk cap is arguably stricter than a lot cap: a tight stop lets you trade bigger, but a wide stop — or no stop — can breach the rule even at modest size.
Why this matters more than leverage
Leverage tells you what the broker will let you open. Position limits and per-trade risk rules tell you what the firm will let you keep. If your strategy relies on one large entry, or on adding to a winner, check both before you buy.
It also matters for automation. Bots and EAs that size dynamically can quietly exceed a hard cap or a per-trade risk rule — our AI trading hub covers which firms allow automation and on what terms.
Quick checklist before you buy
- Is there a lot or contract cap, and does it scale with account size?
- Is it the same on the evaluation and the funded account?
- Is there a per-trade risk % or open-risk limit instead?
- Do gold, indices or crypto carry a lower cap than forex?
- Is a breach a hard fail, or does it trigger a review?
You can line up these rules side by side on our account comparison tool, browse every firm on the firms page, and look up unfamiliar terms in the glossary.
Key takeaways
- Firms limit size in three ways: lots per trade, contracts per account size, or risk per trade.
- Futures firms almost always cap contracts; CFD firms vary widely.
- "No lot cap" rarely means unlimited — a risk or notional cap usually sits behind it.
- Limits can differ between products at the same firm and between evaluation and funded stages.
- Rules change — verify the current limit on the firm's official pages before trading.
This article is educational and does not constitute investment advice. Prop-firm rules change frequently; figures reflect our dataset at the time of writing.
