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Sooner or later everyone running one EA wonders whether they should be running four. The honest answer depends less on diversification theory than on two boring questions: do the EAs actually lose at different times, and can you still tell what is happening when something goes wrong?
Four EAs are not four strategies
Most retail EAs are variations on a handful of ideas: trend following, mean reversion around a range, breakout at a session open, and grid recovery. Buy four trend followers on correlated pairs and you have not diversified. You have quadrupled one bet and given it a smoother-looking backtest. The test is not how many products you own; it is whether their worst weeks fall on different weeks.
Correlation shows up in the drawdown, not the profit
Two EAs can look independent for months and then lose together on the one day it matters, because the thing that hurts them is the same thing: a gap, a spike, a central bank surprise, a spread blowout. Before adding a second EA, ask what market event would hurt both. If you cannot name a scenario where one is up while the other is down, you are not adding a second engine — you are adding weight.
The capital problem nobody mentions
Running four EAs on one account means each one is sizing against a balance the other three can drain. A drawdown in EA A quietly increases the relative risk of EA B, and if any of them uses margin-hungry sequences, the account can hit a margin call from the combination even though no single EA misbehaved. Separate accounts, or hard caps per EA, solve this. Hope does not.
Diagnosis gets exponentially harder
With one EA, a bad month has one possible cause and you can read the log. With four, you have to work out which one is responsible, whether they interfered with each other, and whether the broker was the problem. Most people never do that work, so they turn everything off at once and lose the good ones along with the bad. Complexity you cannot audit is not sophistication.
A reasonable order
Run one EA long enough to know its normal behaviour — its usual trade count, its usual losing streak, how it looks in a bad week. That takes months, not weeks. Then add a second one that trades a different symbol in a different session with a different mechanism, at half the size you think it deserves. Keep the total risk the same as when you ran one; the point of a second EA is a steadier curve, not double the exposure.
When one is the right answer
If your account is small, adding EAs mostly adds ways to lose. Below a few thousand units, position sizes become too coarse to express risk properly across several products, and every EA is fighting for the same margin. One well-understood EA at a size you can hold is a better portfolio than four you cannot follow.
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Our published backtests state period, balance and settings, and our forward accounts are labelled as demo accounts wherever we show them. The full list: fxea365.com/ea/ranking
