Correlation between instruments is one of the easiest risks to miss. You can size every trade carefully and still be risking far more than you think. In this guide you'll learn what correlation in trading means, how it quietly multiplies your exposure and which practical rules help you keep it under control.
In short: two or more trades on correlated instruments behave, in practice, like one larger position. Add up the risk of every trade that depends on the same driver and you'll see your real exposure. Managing it by theme, not just per trade, protects your loss limits.
What correlation between instruments means
Correlation measures how much two instruments tend to move together. It's expressed as a coefficient from −1 to +1:
- Close to +1: they usually move in the same direction.
- Close to −1: they usually move in opposite directions.
- Close to 0: there's no clear relationship.
Correlation isn't a fixed law. It shifts over time and can weaken or strengthen with the context. Still, some relationships show up again and again because the instruments share the same underlying driver.
Why some instruments move together
The most common reason is a shared currency or shared driver. A few examples:
- EUR/USD and GBP/USD: both have the dollar as the quote currency. When the dollar moves sharply, both pairs tend to react in the same direction.
- EUR/USD and USD/CHF: the dollar sits on opposite sides of each pair, so they tend to move in opposite directions.
- US30, US100 and US500: all three are U.S. stock indices and often react similarly to the same backdrop.
- Gold and silver: as precious metals, they frequently share direction.
- WTI and Brent: two oil benchmarks with a very tight relationship.
None of these examples is a recommendation or a forecast. They're here to show that when you trade several instruments from the same group, much of the outcome hinges on a single driver.
How correlation multiplies your exposure
This is the hidden risk. Say your plan reads "0.5% risk per trade" and you follow it to the letter. But at the same moment you open these positions (illustrative example on a $25,000 Direct Access account, with a 3% daily loss = $750):
- Long EUR/USD risking 0.5% ($125).
- Long GBP/USD risking 0.5% ($125).
- Long AUD/USD risking 0.5% ($125).
- Short USD/CAD risking 0.5% ($125).
Each trade follows your rule. But all four are essentially the same bet: a weaker dollar. If the dollar strengthens across the board, there's a good chance all four hit their stops together. Your real risk wasn't 0.5%; it was close to 2% ($500) on a single idea, two thirds of your daily loss allowance.
Indices work the same way. Buying US30, US100 and US500 at 0.75% each is roughly one 2.25% position on U.S. stocks.
How to measure your real exposure
You don't need complex formulas to spot this risk. Just group your trades by the driver they depend on:
- Name the underlying idea behind each trade. Does it depend on the dollar, the yen, the euro, U.S. stocks, gold?
- Group trades that share that idea, taking direction into account. Buying EUR/USD and selling USD/CHF point the same way on the dollar.
- Add up the risk in each group. That total is your real exposure to that driver.
- Compare the total with your daily limits and your per-theme risk rule.
To review how to calculate the risk of each individual trade, see position size calculation.
Practical rules to manage correlation
These rules are examples you can adapt to your plan:
- Cap risk per theme. For example: "Never more than 1% total risk on trades that depend on the dollar." If you already have 0.5% on EUR/USD, a second correlated idea can only carry 0.5% more.
- Split the risk when torn between two instruments. If you see the same setup on EUR/USD and GBP/USD, either pick the better one or split your planned risk across both (for example, 0.25% each).
- Pick the cleanest setup. Often the best way to manage correlation is simply not to double up on the idea.
- Recheck correlations from time to time. Relationships between instruments change. Don't assume what you saw months ago still holds.
- Tag each trade's theme in your journal. Over time you'll see whether your worst days line up with concentrated exposure.
If you're still unsure what percentage to use per trade, read how much to risk per trade.
Correlation and the daily loss limit
Correlation is especially dangerous for the daily loss limit, because correlated trades tend to lose at the same time, in the same move. There's no room to react between one loss and the next.
A day of major dollar news can hit all your USD pairs at once. If your total exposure to that driver is close to your daily loss, a single move can push you to the edge of the limit. To understand how that limit is calculated, read the daily loss limit explained.
The correlated-trades rule at Funded Profit
At Funded Profit, holding opposite exposure at the same time on instruments from the same group counts as hedging and is prohibited. For example, buying EUR/USD while selling GBP/USD. This applies within one account and across your accounts, and breaking it leads to an account reset.
The rules include a table of correlated instrument groups: U.S. dollar, euro, Japanese yen, U.S. indices, European indices, precious metals and oil. Keep in mind that on pairs that usually move in opposite directions (such as EUR/USD and USD/CHF), opposite exposure can happen even when both trades are the same type. Check the full list under correlated instruments.
Also, several trades opened less than 5 minutes apart may be treated as a single position for the 2.5% maximum risk per trade. If you open two correlated trades almost together, their risk can be added up against that limit. You'll find the details under risk per trade.
Trading several instruments in the same direction is allowed. What we ask, in your own interest, is that you do it knowing you're concentrating risk.
Common correlation mistakes
- Thinking more pairs means more diversification. Five dollar pairs aren't five ideas; they're one idea repeated five times.
- Counting risk only per trade. Your account doesn't see isolated trades; it sees the sum of all of them.
- Hedging one trade with a correlated one. Besides not reducing risk the way it seems to, it's a prohibited practice at Funded Profit.
- Forgetting positions carried from earlier days. If you're holding yesterday's GBP/USD trade, a new EUR/USD trade today adds to that exposure.
Trading involves risk, and correlation is one of the ways that risk hides. Making it visible is one of the simplest upgrades you can make to your risk management.
FAQ
What is correlation in trading?
It's the tendency of two instruments to move together (positive correlation) or in opposite directions (negative correlation). It's measured with a coefficient between −1 and +1 and changes over time.
Why does correlation increase risk?
Because several correlated trades tend to win or lose together. If each one risks 0.5% and they all depend on the same driver, your real exposure is the sum of all of them.
Can I trade EUR/USD and GBP/USD at the same time at Funded Profit?
Yes, in the same direction it's allowed, though you should add up their risk. What's prohibited is holding opposite exposure on instruments from the same group, such as buying one and selling the other.
How do I control exposure to correlated instruments?
Group your trades by the driver they depend on, add up the risk in each group and set a per-theme cap in your plan, for example a maximum of 1% total risk on trades that depend on the dollar.