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れんみぃ
06/10/2026 18:30
Release： 06/10/2026 18:30
Update： 06/10/2026 18:30
れんみぃ
Investment style : Trading System
Investment career : More than 10 years
Investment amount : 10 million - 50 million JPY
I’ve been trading for about 11 years with almost no discretion. I’m the kind of person who spends all my time playing around with my own Expert Advisor.
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EA Recommendation ⑨: Thoughts on managing multiple EAs (portfolio) and how many you should hold, from a developer’s perspective

Good morning, everyone. I’m Renmi.

This is the ninth article. In the previous one (8), I explained the NG examples of parameter settings. If you’re thinking, “Okay, I’ve properly set up the first EA! Now I’ll add one more,” this time’s content is something I’d like you to read at that timing.

The previous article is here.

https://www.gogojungle.co.jp/finance/navi/articles/117637


Running multiple EAs at the same time as a “portfolio management” can increase stability if done well. However, if done incorrectly, you may think you’ve diversified, but actually risk is concentrated. This time I’ll talk about that.

Why run multiple EAs?

The main reason isrisk diversification.

Relying on a single EA means that when that EA goes out of balance (when its compatibility with the market worsens), the account will head into a loss as is. By running multiple EAs, if one is underperforming, another EA may cover it.

In stock investing they say “don’t put all your eggs in one basket.” The same goes for EAs.

However, increasing the number does not automatically mean safety

This is the trap.

For example, if you run five EAs targeting USD/JPY, does this constitute “five-way risk diversification”?

The answer depends. Even with the same currency pair, if you combine EAs with completely different logics,as long as you can confirm low correlation between EAs, it will function as proper diversification. The problem arises when you run multiple EAs with similar logic on the same currency pair and assume you’ve diversified.

What matters is not the number of EAs or currency pairs, butthe correlation between EAs.

Points of diversification

① Divide currency pairs

It’s basic to separate to currency pairs with different price movements, such as USD/JPY, EUR/USD, and GBP/JPY.

However, USD/JPY and EUR/USD share the “dollar,” so they are not completely independent. It’s difficult to make correlation zero, so as long as you “combine pairs that seem to be as independent as possible,” that’s sufficient.

② Separate the directional logic

Combining trend-following and range-bound strategies is also effective.

Many EAs have strengths and weaknesses depending on market conditions, so mixing different types of EAs makes it easier to maintain a steady performance in any market.

③ Separate timeframes

There is also the idea of mixing scalping with mid-to-long-term strategies. Since the price movements targeted differ between short-term and long-term, correlations tend to be low.

How many are appropriate?

To be honest,starting with about 2–4 is realisticI think.

The more there are, the more management becomes complex. It becomes harder to know “which EA is performing well now” and “which EA is becoming obsolete,” and you may end up leaving a problematic EA unchecked without realizing it.

It’s recommended to cap at about 5–6 at most, and to add one by one while checking each EA’s performance.

Don’t forget total lots management

What you should be especially careful about with multiple EAs isoverall risk management.

Each time you add an EA, the total number of lots and maximum loss amount increase. Even if you think “each EA’s recommended settings keep us safe,” looking at the total across five EAs can still entail significant risk.

Make a habit of regularly checking whether the total lots relative to the account’s overall margin is appropriate.

By the way, GTX that I sell is designed to be easy to use as a single EA or as part of a multi-EA portfolio. I also publish real-trade results, so please use them as a reference when considering a portfolio.

Summary

  • The purpose of running multiple EAs is risk diversification. However, increasing the number alone is not enough

  • The essence is to reduce correlation via currency pairs, logic, and timeframes

  • Start with 2–4 and gradually increase within your manageability

  • Regularly check total lots and overall risk

To avoid thinking you’ve diversified while actually concentrating risk, try to take an overarching view of the entire portfolio.

Well then, until next time!

Renmi’s EA List

https://www.gogojungle.co.jp/users/189446/products