Almost two-thirds of the world's stock market is American, though the US is only about a quarter of the world economy.

Name: Share of world stock market (charted by MacroSnaps)
Creator: MSCI, exchange data, IMF (2026)
License: https://creativecommons.org/licenses/by/4.0/

The US is about 4% of the world's people and a quarter of its economy, but two-thirds of its stock market.
Share of world stock market66(2026)Share of world economy27(2026)Gap 39 pts

US share of the world stock market (orange) against its share of the world economy (dashed), 2000 to 2026. The market weight has climbed past 66% while the economic weight has drifted around a quarter, and the shaded wedge is the difference.

Why this is happening

America has nearly all of the giant tech winners, and those few names have soared while the rest of the world drifted.
Global investors index by size, so the more US stocks rise, the bigger their slice of every world fund becomes.
Deep markets and the dollar keep pulling in the world's savings, which lifts US prices further, well past what the economy alone would justify.

The take

If you own a "global" index fund, you mostly own America. The whole planet's savings are riding on a few hundred US companies, priced far above their share of world output, which is either the safest trade on earth or the most crowded one.

Source: MSCI, exchange data, IMF (2026)

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<a href="https://macrosnaps.app/c/us-world-stocks">
  <img src="https://macrosnaps.app/charts/us-world-stocks.png" alt="US share of the world stock market (orange) against its share of the world economy (dashed), 2000 to 2026. The market weight has climbed past 66% while the economic weight has drifted around a quarter, and the shaded wedge is the difference." width="640" style="max-width:100%;height:auto">
</a>
<p style="font:12px/1.5 system-ui,sans-serif;color:#6b7280;max-width:640px">
  Chart: <a href="https://macrosnaps.app/c/us-world-stocks">MacroSnaps</a>,
  <a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>. Source: MSCI, exchange data, IMF (2026).
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Cites MacroSnaps for the chart. For the numbers themselves, cite the source below.

MacroSnaps (2026). "Almost two-thirds of the world's stock market is American, though the US is only about a quarter of the world economy." Edition No. 25, 5 August 2026. https://macrosnaps.app/c/us-world-stocks

Permanent link: https://macrosnaps.app/c/us-world-stocks

The underlying data

MacroSnaps drew this chart. The numbers in it are published by MSCI, exchange data, IMF (2026). Their terms, not ours, govern the underlying data.