ATLASPortfolio builder: let ATLAS propose portfolios for your horizon
The ATLAS portfolio builder turns your rules (how long, how much risk, which markets) into three concrete portfolios you can compare side by side.
What it does
Starting from a short test about your situation, the builder searches a universe of ETFs, large US companies and the largest companies of 18 stock exchanges, plus any company you add yourself. It returns three options with weights, expected risk and dividend income, so you choose between real alternatives rather than staring at a blank page.
The goal is to keep the decision understandable: you see what each portfolio holds, how concentrated it is, and how it compares with the others on risk and yield before you commit anything.
Worked example with live data
Real ATLAS numbers, prices as of Oct 26, 2026.
Why mixing helps, shown with AAPL, MSFT and JNJ: their average yearly volatility is 23%, but an equal-weight blend with a 50% correlation assumption has about 19%, a reduction of 18%. The blend's average price versus fair value is +37% and its average dividend yield is 1.0%.
How ATLAS calculates it
Each holding enters with its expected return, volatility from its latest ATLAS signal and its dividend yield. Weights are set under your caps (for example a maximum per stock), and the portfolio's risk is computed from the individual volatilities and their correlations, so owning several similar companies is correctly shown as less diversified than it looks.
The builder works from stored data only, so it does not wait on outside providers and the same inputs give the same portfolios.
Limits you should know
A builder optimizes under assumptions about the future that may not hold, and it only chooses among the assets in its universe. Weights are a starting point to review, not a personal recommendation.
Where it sits in the plans
The simple version of the builder is in every plan. The Intermediate version needs Starter and the full builder needs Plus.
Run it on your own numbers
Create an account to use this tool with your stocks, your amounts and your horizon.
Get started →Plans from €3.99 a month.
Frequently asked questions
How do I build a good investment portfolio?
Start from your horizon and how much loss you can tolerate, spread across several unrelated holdings, and keep costs low. The ATLAS builder applies these rules and shows the trade-offs between options.
What is a portfolio builder?
A portfolio builder is a tool that assembles a set of investments with weights from your goals and risk limits, instead of you choosing each one by hand.
Does the ATLAS builder include ETFs?
Yes. The universe includes ETFs, large US companies, the largest companies of 18 exchanges and any company you add.
Is the proposed portfolio personal investment advice?
No. It is a model output based on the rules you set. Review it against your own situation before investing.
Related tools
- Portfolio simulatorA portfolio simulator shows the range of values your holdings could reach, not a single forecast. In ATLAS you enter any stocks and quantities and simulate horizons from one day to 20 years.
- Goals plannerThe goals planner runs a Monte Carlo simulation on your savings plan and tells you the chance of reaching your target, instead of assuming a smooth average return.
- ETF analysisAn ETF is a basket. ATLAS opens the basket and shows its size, cost, yield, returns, its top holdings and its sector and region mix, so you know what you own.
Stocks used in this example
Open any of them to see the full public page, with fair value, odds and a one-year chart:
Not investment advice. ATLAS estimates come from statistical models and public data; they can be wrong and past results do not predict future ones. Disclaimer