Currency FOMO may yet draw US investors overseas

U.S. investors remain significantly underweight foreign equities despite the dollar's recent 10% decline against major currencies and the MSCI all-country ex-U.S. index's nearly triple outperformance (17% vs. S&P 500's 6%) this year, largely bolstered by currency gains. This stark divergence, coupled with the prospect of further dollar weakness, suggests a looming 'fear of missing out' (FOMO) could prompt a substantial rebalancing of U.S. portfolios into international assets. Such a shift could magnify global equity outperformance over Wall Street and potentially exert additional downward pressure on the dollar.

Analysis

A significant performance divergence has emerged between U.S. and international equities, primarily driven by currency movements. The U.S. dollar's 10% decline against major currencies in the first half of 2025 has amplified returns for dollar-based investors in foreign markets, with the MSCI all-country ex-U.S. index gaining nearly 17%, almost triple the S&P 500's 6% rise. This effect is stark in specific markets, with Euro zone stocks up 27% and Germany's DAX up 37% in dollar terms. Despite this outperformance, U.S. investors remain heavily underweight international assets; Morningstar data indicates a typical un-rebalanced portfolio's U.S. equity allocation has drifted from two-thirds to 71% over five years, while international funds comprise only 26% of total fund assets versus a market-cap-weighted benchmark of 37.7%. This under-allocation, combined with cheaper valuations abroad, creates the potential for a 'fear of missing out' (FOMO) driven rebalancing into non-U.S. assets. Such a shift could be catalyzed by, and in turn contribute to, further dollar weakness, which may be fueled by falling U.S. interest rates and widening deficits. However, risks to this thesis include the uncertain evolution of trade policy, shifts in relative economic performance, and a potential return to 'home bias' in a fraught global policy environment.

Key Decisions for Investors

• Investors should conduct a strategic review of their portfolio's geographic allocation, as market inertia may have led to a significant overweight in U.S. equities and a corresponding underweight in outperforming international markets.
• Consider the currency impact as a dual-edged sword; while the dollar's 10% decline has been a primary driver of non-U.S. equity outperformance, a reversal in this trend would pose a significant headwind to unhedged international positions.
• Monitor key catalysts for further dollar weakness, including U.S. interest rate policy and the trajectory of trade and fiscal deficits, as these will be critical determinants for the persistence of this investment theme.
• While chasing recent performance is a risk, the valuation differential, with international markets appearing cheaper, provides a fundamental argument for rebalancing that complements the current technical and currency-driven momentum.