Build Your Own World Portfolio
You can cover the entire global stock market with very few ETFs. The simplest setup is a single FTSE All-World (or MSCI ACWI) ETF. The classic two-ETF version combines 70 % MSCI World with 30 % Emerging Markets. If you want to diversify further, a three-ETF version adds around 10 % World Small Cap. More ETFs mean more control — but also more rebalancing.
The idea: the whole stock market in one account
A world portfolio tracks the global stock market as broadly and cheaply as possible. The good news: you don’t need ten funds for that. A single broadly diversified ETF already holds thousands of companies from developed and emerging markets. The question isn’t whether, but how finely you want to steer it — and how much upkeep you’re willing to accept.
- 1 ETF: maximum simplicity — an FTSE All-World or MSCI ACWI holds developed and emerging markets at market weight, with no rebalancing.
- 2 ETFs: 70 % MSCI World + 30 % Emerging Markets — you set the EM weight yourself, but you have to rebalance.
- 3 ETFs: World + EM + ~10 % World Small Cap — the broadest spread across all market segments, but more effort.
The 1-ETF solution: FTSE All-World
The simplest version is a single world ETF. An FTSE All-World (e.g. Vanguard) or an MSCI ACWI already holds developed and emerging markets at their market-cap weighting. You buy one fund, set up a savings plan — and the portfolio stays balanced automatically, because the index re-weights itself. No rebalancing, no decisions about quotas. For the vast majority of investors, this is the best choice.
The 2-ETF solution: 70 % World + 30 % Emerging Markets
The classic among DIY investors is the 70/30 split: 70 % MSCI World (developed markets) plus 30 % MSCI Emerging Markets. The advantage: you set the EM weight yourself — in the FTSE All-World it is only around 10 %. Investors who want to give emerging markets more weight can do so this way. The price: you have to rebalance regularly so the ratio doesn’t drift out of line.
The 3-ETF solution: + World Small Cap
If you want to be really precise, you add a World Small Cap ETF (around 10 %) to the 70/30 version. MSCI World and Emerging Markets mostly hold large and mid-cap companies — small caps are largely missing. With this third building block you also cover that segment and get closest to the “true” total market. The downside: three positions, three savings plans and more complex rebalancing.
World portfolio: 1, 2 or 3 ETFs compared
| Setup | Components | Pros | Effort |
|---|---|---|---|
| 1 ETF | FTSE All-World / MSCI ACWI | maximally simple, self-balancing | no rebalancing |
| 2 ETFs | 70 % World + 30 % EM | EM weight freely adjustable | annual rebalancing |
| 3 ETFs | World + EM + ~10 % Small Cap | broadest spread, all segments | more rebalancing |
How to choose? Simplicity vs control
At its core, the decision is a trade-off between simplicity and control. If you want a true “buy-and-forget” solution, take the single FTSE All-World — it’s cheap, broad and maintenance-free. If you want to deliberately steer the emerging-markets weight or add small caps, two or three ETFs are the way. Important: more building blocks do not automatically mean higher returns — above all they mean more control and more work.
A world portfolio of three ETFs is not inherently better than a single FTSE All-World. Every extra building block increases the rebalancing effort and the risk that you drift off course in turbulent phases. Historically, 1-, 2- and 3-ETF solutions have delivered similar returns. The biggest lever is not the number of funds, but staying invested for the long term and keeping costs low.
FAQ — Build your own world portfolio 2026
How do I build a world portfolio?
The simplest way is a single broadly diversified ETF tracking the FTSE All-World or MSCI ACWI — it covers developed and emerging markets at market weight and needs no rebalancing. If you want to set the emerging-markets weight yourself, combine two ETFs (70 % MSCI World + 30 % Emerging Markets). A three-ETF version adds around 10 % World Small Cap for maximum diversification. Then set up a savings plan and stay invested for the long term.
70/30 or a single ETF?
Both are sensible. A single FTSE All-World is the simplest solution: broadly diversified, cheap and rebalancing-free, but with only around 10 % emerging markets. The 70/30 split (70 % MSCI World + 30 % Emerging Markets) gives you more control over the EM weight, but requires regular rebalancing. For most investors the single ETF is enough; 70/30 only pays off if you deliberately want to weight emerging markets higher.
How many ETFs do I need?
One is enough. An FTSE All-World or MSCI ACWI covers thousands of companies from over 40 countries with a single fund. Two or three ETFs (World + EM, optionally + small cap) give you more control, but are not automatically higher-returning. More than three equity ETFs are generally unnecessary for a classic world portfolio.
Do I have to rebalance?
With the 1-ETF solution, no — the index weights itself. With two or three ETFs, yes: you should bring the holdings back to your target weights (e.g. 70/30) about once a year, because the weights drift apart through different price movements. The easiest way is via your savings-plan contributions, directing fresh money into the underweighted position rather than selling.