What it contains
The index covers about 85% of the free-float market value in each of the 23 countries. Companies are weighted by size, so the largest companies make up the largest share. All figures here are from MSCI's fact sheet of 31 August 2026.[1]
| Country | Share |
|---|---|
| United States | 72.14% |
| Japan | 5.78% |
| United Kingdom | 3.53% |
| Canada | 3.46% |
| France | 2.36% |
| Other countries | 12.74% |
The ten largest companies make up 26.61% of the index. The three largest are NVIDIA (5.56%), Apple (5.07%) and Microsoft (3.90%). The largest sector is information technology, at 29.81%.[1]
What it leaves out
- Emerging markets. China, India, Brazil and other emerging markets are not included. MSCI ACWI adds them: 2,458 companies in 47 countries.[2]
- Small companies. The index holds large and mid-sized companies only.
How it has performed
Since the end of 1987 the index has returned 9.08% a year in US dollars, with dividends reinvested and before fees. Its largest fall was 57.46%, between October 2007 and March 2009.[1] Past performance does not predict future returns.
How you invest in it
You cannot buy an index directly. You buy an index fund or ETF that holds the same companies in the same proportions. Many fund companies offer one. See Which global index fund?
Common questions
Who is MSCI?
MSCI is a company that builds and maintains stock indices. It does not sell funds. Fund companies pay to use its indices.
Why is the US share so large?
Because the index weights companies by market value, and American companies make up most of the market value in developed countries. The share changes as prices change.
Sources & further reading
We cite independent authorities so you can verify everything yourself. Last reviewed 15 Sept 2026.