ExecutiveSummary
This report set out to document why Europe's small market capitalisation
is a structural handicap. It ends, on the evidence, documenting
something more specific and more useful: not that the market is too
small, but that it is too fragmented, too dependent on foreign
capital, too concentrated in the wrong sectors, governed by a body
industry can advise but not vote on, and — in its growth-company
tier — too quietly labelled for the retail investors it is now
recruiting to notice the difference.Europe'sstock market capitalisation is genuinely, substantially smaller than
America's relative to the size of its economy — roughly 50-60% of
GDP versus the United States' 224%. That fact is not in dispute. What
this report set out to test is a more specific claim: that this gap
is itself the structural cause of Europe's weaker innovation and
competitiveness. After working through the academic finance-growth
literature, the EU's own policy diagnostics, and detailed comparative
research into how European capital markets are actually built,
funded, and governed, the evidence supports a more precise conclusion
than the original question implies. The raw size gap is real but is
not, on its own, what the strongest research identifies as causal.
What the evidence does support, with much greater confidence, is that
Europe's capital markets are handicapped by fragmentation— of exchanges, of post-trade infrastructure, and of regulatory
supervision — by bigglobal investors increasingly choosing US stocks over European ones,by a sectorcompositionthat concentrates Europe's market value in mature, bank-financeable
industries rather than the R&D-intensive firms equity markets
serve best, by a specific,EU-wide design choicein how growth companies are admitted to public markets, which
privatises admission gatekeeping to commercially conflicted
intermediaries, and by growth-marketlistings that don't clearly warn investors of their risk.These are more precise, more actionable, and better-evidenced
findings than "market cap is too small," and they point
toward different policy fixes.DOWNLOAD FULL REPORT HERE
Liquidity,Not Just Size: Defining and Measuring the Gap
Market capitalisation — the total value of listed shares divided by GDP — is a widely used but blunt proxy. It is easy to calculate and easy to compare across countries, which is why it dominates policy discussion. But the foundational academic literature on finance and growth draws a sharper distinction than the headline number suggests. Ross Levine and Sara Zervos' 1998 study, still the most cited paper in this field, found a significant link between stock market development and long-run growth — but subsequent re-examination of this same literature, including by Levine himself, found that market size specifically is not a robust predictor of growth; market liquidity is. A large but illiquid, fragmented market does not reliably deliver the growth benefit that a smaller, well-integrated, highly liquid market can. This matters directly for how Europe's gap should be interpreted: the policy-relevant question is not simply "how do we make the number bigger," but "why is European liquidity and capital mobilisation structurally weaker," which is a different and more tractable question.
That weakness is large and measurable. As of early 2026, total US stock market capitalisation stood at roughly 224% of GDP. The euro area has historically run at roughly 50-60% of GDP — a three-to-four-times difference that has persisted for decades. This is not a newly discovered problem: Mario Monti's 2010 report to the European Commission, A New Strategy for the Single Market, already diagnosed a fragmented internal market as a drag on European growth, fourteen years before Draghi. Mario Draghi's 2024 EU competitiveness report puts a concrete number on the consequence today: an estimated €750-800 billion annual investment gap relative to what Europe needs to fund productivity growth, digitalisation, defence, and the green transition, which the report ties explicitly to underdeveloped capital markets rather than a shortage of underlying savings — European households save at high rates; the money exists but is disproportionately held in bank deposits rather than invested in equity. That two landmark reports, fourteen years apart, reach the same diagnosis says something on its own about how hard this problem is to fix.
Where the Money Actually Goes: Institutional Flows and Home Bias
The size gap is not just a supply-side story about how many companies list in Europe — it is compounded by a demand-side pattern: global institutional capital is disproportionately allocated to US equities, and the imbalance is widening, not closing.
A April 2026 Bruegel policy brief (Schoenmaker) found the European market share of US-based asset managers rose from 40% to 47% between 2021 and 2026, driven partly by consolidation — Goldman Sachs' 2022 acquisition of the Netherlands' NN Investment Partners, and US-based Nuveen's 2026 takeover of UK-based Schroders. Globally, North American asset managers' share of worldwide assets under management rose from 73% to 78% between 2021 and 2025, while Europe's fell from 21% to 17%.
The same research puts a number on home bias itself. The "Big Three" passive managers — BlackRock, Vanguard, State Street — hold a median 24% stake in S&P 500 companies. In European companies, that figure is only 5-16%. Free-float differences (88% of shares tradeable in the US versus 71% in Europe) explain only part of this gap; most of it reflects a genuine choice by investors, not just a difference in what's available to buy — a choice explained in more detail in Annex A.
One related finding: this shift is changing how European companies are governed, not just who owns them. European asset managers voted in favour of environmental and social shareholder resolutions roughly 86% of the time in 2024; US managers' support for the same resolutions fell from 49% in 2021 to just 17% in 2024. One caveat: 2025-2026 fund flows show a real tactical rotation toward Europe, with non-US developed markets outperforming the S&P 500 through much of 2025 — but this starts from the extreme concentration above, so a genuine reversal would take considerable time to close the underlying gap.
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