MSCI ACWI — the All Country World Index — is MSCI’s global equity benchmark including emerging
markets. In fact, it is the index people mean when they say “MSCI World” and are wrong about it.
iShares runs the largest European tracker. It describes the objective as tracking “an index composed of
companies from both developed and emerging markets countries worldwide”. It also promises
“exposure to broadly diversified companies, combining developed and emerging markets exposure”.
ACWI versus MSCI World: one word, a large difference
MSCI publishes both indices, but the naming is unhelpful. MSCI
World covers 23 developed countries only. By contrast, ACWI adds emerging markets. So “World”
is the narrower product, while “All Country World” is the global one.
You can see the difference directly in the funds. For example, the largest European MSCI World tracker reported 1,252
holdings as of 18 September 2026. On the same date, its ACWI sibling reported 1,657 holdings. The extra
positions are the emerging-market exposure that MSCI World leaves out entirely.
For most investors, this is the only decision that matters when choosing between the two. Do you want China, India,
Taiwan, Brazil and South Korea inside your core fund, or not at all? Both answers are defensible. However, choosing the
developed index by accident, because the name sounded global, is not.
Reading a tracker’s key facts
Here is what the iShares product page showed on 18 September 2026:
Benchmark: MSCI All Country World Index (Net), ticker NDUEACWF. The Net version assumes
the reinvestment of dividends after a standardised withholding-tax deduction. That makes it the honest benchmark for a
fund holding companies across dozens of tax jurisdictions.
1,657 holdings, total expense ratio 0.20%, accumulating, domiciled in
Ireland, with a quarterly rebalance. It also had net assets of USD 37.85bn and an
inception date of 21 October 2011.
Physical replication using an optimised methodology. The fund holds real shares, but not every
constituent in exact proportion. That is a practical necessity across emerging markets, since some positions cost a lot
to hold. Meanwhile, the securities-lending return was 0.03% as of 30 June 2026.
Portfolio characteristics on the same date included a price/book ratio of 3.89. They also included a three-year
standard deviation of 12.37%. Those numbers move. So we quote them only to show what the fund page gives you, not as
current figures.
Comparing index funds? Take the decision workbook with you.
The ETF Comparison Workbook: TER, domicile, withholding and overlap checks in one printable spreadsheet.
ACWI versus FTSE All-World
These are competing answers to the same question. However, the choice between them matters less than either
marketing department suggests.
The visible difference is breadth. The ACWI tracker above reported 1,657 holdings. By contrast, the largest European
FTSE All-World tracker reported 3,784 stocks at 31 August
2026. Some of that is index universe, and some is replication approach. Still, a FTSE All-World fund does reach further
down the size scale in practice.
The second difference is country classification. FTSE and MSCI disagree on the developed/emerging boundary for some
markets. Also, those calls change over time. Overall, the practical effect on a diversified global fund is modest. Our
comparison of MSCI against FTSE covers
where the families part company.
So what actually decides it for most European investors? Usually availability, cost and accumulating-versus-distributing
options at their broker, rather than index methodology. First, compare live figures in the
UCITS ETF comparison tool. Then check what your
platform charges in the EU broker fee dataset.
Where it fits in a portfolio
MSCI built ACWI to be a complete equity allocation on its own. So if you hold it, you should not also need a separate
emerging-markets fund. After all, you already own them at global market weight. Adding one is therefore a deliberate
overweight, not diversification. The
overlap calculator will show you exactly how much
you are duplicating.
The usual caveats apply. First, it has no small caps. Second, it has heavy US weighting as an output of market-cap
weighting. Finally, it faces the structural tax questions that affect any fund holding US equities from Europe. For more,
see our tax efficiency guide and
accumulating
versus distributing.
Why the “Net” version matters more here than elsewhere
Every index provider publishes multiple return versions. For a global index spanning dozens of tax jurisdictions, the
difference between them is larger than most investors realise.
Gross versus net return
A gross return version assumes full reinvestment of dividends, with no tax deducted anywhere. By
contrast, a net return version assumes reinvestment after a standardised withholding-tax deduction. The
gap between the two is not theoretical. It is money that each country withholds at source before it ever reaches the
fund. A global index touching both developed and emerging markets therefore accumulates that leakage across many tax
regimes at once.
This is why the fund above benchmarks against MSCI All Country World Index (Net) rather than the gross version. It is
also why a fund’s domicile matters to your outcome, independently of its fee. Treaty access determines how much
withholding tax a fund can reduce or reclaim. And no amount of fee competition changes that. Our
tax efficiency guide covers where the leakage
happens.
Check which version you compare against
The practical instruction is simple. When comparing a fund’s published performance against “the index”,
check which version. For example, a gross index will always make a fund’s net-of-tax return look worse than it is. On
the other hand, a price index will always make it look better.
Frequently asked questions
What is the difference between MSCI World and MSCI ACWI?
MSCI World covers 23 developed countries only. MSCI ACWI — All Country World Index — adds emerging markets. Despite
the name, MSCI World is the narrower index.
How many companies are in an MSCI ACWI fund?
The largest European tracker reported 1,657 holdings as of 18 September 2026. The fund uses optimised replication, so
it does not hold every index constituent.
Do I need a separate emerging-markets fund alongside ACWI?
No. Emerging markets are already inside the index at global market weight. Adding a dedicated fund is an intentional
overweight rather than extra diversification.
Is ACWI or FTSE All-World better?
Neither is clearly better. They target the same exposure with different provider rules and different country
classifications. Availability, cost and share-class options at your broker usually decide it.
Cited sources: iShares MSCI ACWI UCITS ETF product page, and MSCI index family. Verify current fund figures before investing. Educational content, not financial advice.
Not personalised financial advice. Verify your situation with a qualified adviser. Operated by Aurum Digital Marketing LTD (UK), Companies House 15203665.
European UCITS/ETF investor with 11+ years building a global dividend and index portfolio, and founder of Financial Expert Class. I write every guide here from first-hand experience investing across EU brokers and tax regimes — not theory. More about me →