Europe's $10.4 Trillion U.S. Stock Holdings Face Diversification Pressure

European investors, who hold a pivotal $10.4 trillion in U.S. equities, are showing signs of seeking to reduce their exposure, adding uncertainty to a market at historic valuations. This sentiment is driven by U.S. trade policy uncertainty under a second Trump administration and broader geopolitical tensions, according to analysts from firms including Amundi SA and Bank of Nova Scotia. Amundi's Chief Investment Officer noted a client trend toward reducing U.S. asset dependency accelerating since April 2025. While a coordinated mass sell-off is not imminent, the concentration risk is prompting discussions on diversification. Analysts warn sustained diversification could pressure U.S. stocks, bonds, and the dollar long-term, as investors reassess financial integration with the U.S.