It has become the almost systematic reflex of French savers who launch themselves into the stock market. THE MSCI World, flagship index bringing together around 1,700 companies from 23 developed countries, attracts for its simplicity and apparent global diversification. But behind the label lies a different reality. Next to 75% of its weighting is made up of American stocks, and 30% of the capital is concentrated on the top ten capitalizations, mainly tech giants.
For Emmanuel de la Jonquière, director of individual savings, retirement and protection at AXA France, this shortcut is risky. “ If there is one piece of advice to remember, it is to diversify your savings. If an MSCI World ETF has the advantage of being simple and easily accessible, investing in a single fund means missing out on the benefits of diversification, namely reducing risk taking for the same level of return. » The year 2025 also provided an enlightening demonstration.
The pitfalls of MSCI World behind its apparent simplicity
With 75% American equities, MSCI World exposes investors to the economic and monetary situation in the United States much more than to the diversity of the developed world. A reversal of the dollar, a correction in American tech or a decision by the Federal Reserve directly affects the majority of the portfolio. Added to this is sectoral concentration. The first ten capitalizationsmainly Apple, Microsoft, Nvidia, Amazon, Meta, Alphabet and Tesla, alone account for 30% of the index.
The demonstration by recent figures speaks for itself. “ As an illustration, in 2025 an MSCI World ETF would have significantly underperformed a basket ofETFs on European stocks or emerging stocks »explains Emmanuel de la Jonquière. When the markets Americans are going through a cycle of consolidation and Europe or emerging countries record notable increases, the saver who has bet everything on the MSCI World misses the rotation. The simple reflex can therefore prove costly at certain times.
Last point often ignored, the MSCI World is not eligible for PEA in direct replicationsince it contains non-European actions. Savers access the index via Synthetic ETFs who replicate it by exchange contract (swap) while respecting the PEA eligibility constraint. These products, offered in particular by Amundi, BNP Paribas Easy or Lyxor, add a modest but real counterparty risk, in addition to the market risk of the underlying replicated.
Building a diversified basket beyond just the global index
For those who want to broaden their exposure while remaining in the ETF universe, several complementary bricks exist. A MSCI Europe ETF provides access to large capitalizations on the continent and brings a European share to the portfolio. A MSCI Emerging Markets ETF covers emerging markets, completely absent from MSCI World, with higher volatility but different return potential. A MSCI World Small Cap ETF opens access to global small caps, a driving segment in the long term but little represented in the broad index.
Diversification can go further than just stock ETFs. Emmanuel de la Jonquière invites us to broaden the spectrum. “ We must even go further than just ETFs, I am thinking in particular of real assets such as infrastructure assets or investment capital which present a very attractive risk-return couple with performances quite comparable to the listed stocks but with less volatile behavior, which in addition allow savers to invest in the real economy and most often in Europe. » L’gold has for its part experienced a remarkable performance in 2025, and naturally finds its place in a pocket of diversification, without going through the PEA on the other hand.
On the practical allocation side, several schemes coexist. A balanced portfolio can combine 50 to 60% of MSCI World, 20 to 30% of Europe and emerging countries, and 10 to 15% of small caps. More cautious profiles lower the equity portion in favor of sovereign bonds or euro funds via life insurance. The most useful rule remains to take into account the investment horizon, a minimum of five years for equity ETFs, and to rebalance annually to maintain the target allocation. Ultimately, the MSCI World should not be avoided, but it should not represent the entire portfolio of a PEA.
The weightings quoted from MSCI World correspond to the weights observed at the start of 2026 and evolve continuously with market capitalizations. Past performance is no guarantee of future performance. Equity ETFs carry a risk of capital loss. The proposed allocation schemes are indicative and must be adapted to the financial situation, investment horizon and risk tolerance of each investor. The support of a financial investment advisor remains useful for the most involving decisions.
