MSCI World vs FTSE All-World: the fight that barely matters
Four global indices, fact sheets of 31 August 2026. Holdings, US share, emerging markets. And why your costs matter more than the logo on the index.
Forums can burn 400 comments on this question. The fact sheets answer it on two pages each. Guess which one I read.
I’m using the fact sheets from MSCI and FTSE Russell dated 31 August 2026. Weights shift every month, so this is a snapshot, not scripture.
The four indices side by side#
| MSCI World | MSCI ACWI | FTSE Developed | FTSE All-World | |
|---|---|---|---|---|
| Markets | 23 developed | 23 developed + 24 emerging | 25 developed | 48 developed and emerging |
| Constituents | 1,280 | 2,458 | 1,974 | 4,264 |
| US weight | 72.14% | 63.59% | 68.62% | 61.71% |
| Emerging markets share | 0% | about 11.9% | 0% | about 10.1% |
| Top 10 holdings | 26.61% | 24.26% | 25.59% | 23.73% |
| Largest holding | 5.56% | 4.90% | 5.33% | 4.79% |
| Small caps | no | no | no | no |
All data as of 31 August 2026. The emerging markets shares are my own calculation from the index market values in the fact sheets.
So: two pairs. MSCI World and FTSE Developed are the “developed markets only” versions. MSCI ACWI and FTSE All-World are the “everything large and mid-sized” versions.
“World” is a generous word#
The MSCI World isn’t the world. Not even close. It covers 23 developed countries and no emerging markets. No China, no India, no Taiwan, no Brazil.
Inside those 23 countries it covers about 85% of the free-float market value. That’s the large and mid caps. The small companies are missing.
Same story for the other three. The FTSE All-World targets 90% coverage with large and mid caps. It’s a subset of the broader FTSE Global Equity Index Series, which covers 98% of the world’s investable market value.
So “all-world” means all regions, not all companies. Marketing named it. Maths didn’t.
Why FTSE has more holdings#
4,264 against 2,458 sounds like a knockout. It mostly isn’t.
Guess first
A lot of lines, very little weight. The number of holdings tells you almost nothing about where your money sits.
FTSE cuts deeper into the mid caps and holds many more small positions in emerging markets. China alone accounts for 1,278 constituents in the FTSE All-World, at an index weight of 2.74%.
More lines in the list, almost the same weight at the top. A longer guest list, same people at the head table. The ten largest holdings of MSCI ACWI and FTSE All-World are the same ten companies.
Same country, different league#
The two providers can’t even agree on who counts as developed. Two committees, two truths.
FTSE classifies South Korea and Poland as developed markets. MSCI lists both under emerging markets. In the FTSE Developed, Korea weighs 2.78%.
Why should you care? Because it bites when you mix providers. A FTSE Developed fund plus an MSCI Emerging Markets fund holds Korea twice. An MSCI World fund plus a FTSE Emerging fund doesn’t hold it at all.
The US share: feature or bug?#
Between 62% and 72% of each index sits in US companies. Nobody at the index provider decided that. No committee, no five-year plan, just prices. It’s what market-cap weighting spits out when US companies are worth that much.
You can call it concentration risk. You can also call it owning companies in proportion to what the market thinks they’re worth. Both are correct, which is annoying.
Adding emerging markets lowers the US share by about nine percentage points, from 72.14% in the MSCI World to 63.59% in the MSCI ACWI. The character of the portfolio stays the same.
The classic 70/30 against one fund#
The 70/30 portfolio is a classic in German-speaking forums, defended with religious zeal: 70% MSCI World, 30% MSCI Emerging Markets. The idea is to weigh regions closer to their economic output than to their stock market value.
Guess first
In US dollars, before costs. Clearly less, for a full decade. Whether the next one looks the same, nobody knows.
So has the bet paid off? Over the ten years to 31 August 2026, in US dollars and before costs:
| Index | Return per year |
|---|---|
| MSCI World | 13.56% |
| MSCI ACWI | 13.12% |
| MSCI Emerging Markets | 9.73% |
In that decade, more emerging markets meant less return. Ouch. In the twelve months to 31 August 2026 it was the other way round: emerging markets 39.66%, MSCI World 20.83%.
Since 31 December 1987, the MSCI Emerging Markets returned 10.50% a year and the MSCI World 9.08%. Pick your period and you can prove either side, which is exactly what the forums do. Historical returns aren’t promises, in either direction.
I wouldn’t try to guess the next decade. Here are the honest options:
- One all-world fund if you want market weights and zero maintenance.
- World plus emerging markets if you have a reason for a different weight and the discipline to rebalance.
- World only if you accept leaving out emerging markets. The gap is smaller than it sounds: about 12% of the large and mid cap market.
All three are fine. Switching between them every two years isn’t.
What actually moves the needle#
The 10-year gap between MSCI World and MSCI ACWI was 0.44 percentage points a year. Between FTSE Developed and FTSE All-World, the 5-year gap was 0.5 points. Nobody knows the sign of the next one. Nobody.
The cost gap, though? That one you know in advance.
And the savings rate is an even bigger lever. At 7%, raising the plan from €200 to €300 a month lifts the end value from about €234,000 to about €351,000. No index choice gets you that.
Guess first
More than half, in under a year and a half. Your plan has to survive that, not the average year.
Then there’s behavior. The MSCI World lost 57.46% between 31 October 2007 and 9 March 2009. Whoever sold near the bottom didn’t have an index problem. He had a nerves problem.
How you stay in your seat during a drop like that is part of Don’t break it.
How I’d decide#
- Decide whether you want emerging markets at market weight, at a higher weight, or not at all.
- Pick the index family that matches. Don’t mix providers across the developed and emerging line.
- Compare the UCITS ETFs on that index by total cost, fund size and tracking. The label is explained in Investing in Europe.
- Choose accumulating or distributing.
- Automate the savings plan and stop reading index threads. Seriously.
This article is education, not investment advice. I name indices, not products, and an index is not a recommendation.
Sources#
- MSCI World Index (USD) fact sheet, 31 August 2026
- MSCI ACWI Index (USD) fact sheet, 31 August 2026
- FTSE All-World Index fact sheet, 31 August 2026, FTSE Russell
- FTSE Developed Index fact sheet, 31 August 2026, FTSE Russell
- FTSE All-World Index overview, LSEG
Education, not advice. I don’t know your situation, and past returns promise nothing. Check my numbers, then make your own call. You’re a grown-up.