Management Summary Research Study “Toward an Integrated European Capital Market: Lessons from the U.S. and Policy Imperatives for the EU”

The European Union is at a critical juncture in terms of its long-term economic competitiveness. Despite being one of the world’s largest economic blocs, its capacity to mobilize capital, finance innovation, and support strategic priorities such as the green and digital transitions, defense, and technological sovereignty remains structurally constrained. A central weakness lies in the persistent fragmentation of European capital markets, which significantly undermines their efficiency relative to the highly integrated U.S. model.

This study provides a systematic comparison of EU and U.S. capital markets and demonstrates that fragmentation in Europe results in substantially higher transaction costs, lower liquidity, and weaker attractiveness for both issuers and investors. Empirical evidence shows that firms listed on EU exchanges face, on average, more than 150% higher bid–ask spreads and approximately 45% lower trading intensity (turnover) than comparable U.S.-listed firms. These gaps cannot be explained solely by firm size or volatility; instead, they are primarily driven by structural features of market design, regulatory architecture, and the absence of effective liquidity consolidation.

A key differentiating factor is market architecture. U.S. capital markets benefit from centralized regulation, mandatory consolidation of market data, and enforceable best-execution and routing rules, which effectively pool liquidity across venues. In contrast, European markets remain dispersed across numerous trading platforms, post-trade infrastructures, and national supervisory authorities. This fragmentation raises search and execution costs, weakens price discovery, and ultimately reduces investor confidence and participation.

These structural disadvantages are also reflected in primary markets. While U.S. exchanges consistently attract the majority of global IPO activity, particularly in strategic sectors such as, technology and life sciences Europe remains a fragmented and less competitive listing environment. The analysis shows that larger and internationally oriented firms are significantly more likely to choose U.S. listings, driven by deeper liquidity, broader investor bases, stronger analyst coverage, and superior post-listing visibility. As a result, European capital markets struggle to serve as natural growth platforms for globally ambitious firms.

Qualitative evidence from expert interviews reinforces the conclusion that the problem extends beyond formal rule harmonization. Fragmentation is sustained by divergent national supervisory practices, inconsistent application of EU rules (“gold-plating”), heterogeneous tax and insolvency regimes, and uneven development of pension systems. These national-level differences limit cross-border capital flows, suppress long-term investment, and prevent the emergence of a strong, pan-European institutional investor base. Low retail participation further exacerbates the liquidity gap relative to the United States.

The study concludes that without decisive progress toward deeper capital market integration, the EU will struggle to finance its strategic ambitions and close its competitiveness gap with the U.S. The Savings and Investments Union (SIU) represents an important strategic response, but its success will depend on effective implementation: strengthening supervisory convergence through ESMA, delivering high-quality consolidated market data, reducing key national legal and fiscal barriers, and mobilizing long-term household savings into capital markets.

For senior executives, investors, and policymakers, the implications are clear. Capital markets are not a technical regulatory issue but a core component of economic competitiveness and strategic autonomy. Jurisdictions that offer deep, liquid, transparent, and trusted capital markets are better positioned to support innovation, scale firms, and attract global capital. Europe currently lags behind on these dimensions and without targeted, pragmatic reforms, this gap is likely to widen rather than close.