Over the last decade, the Vanguard S&P 500 ETF (VOO) has demonstrated remarkable outperformance compared to the Vanguard Total International Stock ETF (VXUS). This considerable disparity in returns has led many investors to reconsider the conventional benefits of international diversification and the optimal composition of their investment portfolios. Although VXUS, which encompasses non-US equities, is traditionally seen as a vital component for global exposure, its recent performance history presents a compelling argument for the robust growth seen in the US market.
Vanguard Total International Stock ETF (VXUS) is typically the go-to choice for investors aiming to broaden their portfolios with non-US equities. This strategy inherently aims to spread investment risk across multiple economies, reducing reliance on any single national market. However, a detailed analysis of performance over the past ten years, concluding on October 16, 2026, reveals that VXUS generated a return of 139.56%. In stark contrast, the Vanguard S&P 500 ETF (VOO) achieved a staggering 320.81% return during the same period. This translates to an impressive 181.25 percentage point lead for VOO. Both figures assume that all distributed earnings were reinvested, with the measurement period commencing on October 18, 2016.
These two exchange-traded funds target distinct segments of the global stock market. VXUS, as delineated in its February 27, 2026, summary prospectus, functions as the ETF share class for the Vanguard Total International Stock Index Fund, tracking companies located in developed and emerging markets globally, explicitly excluding the United States. Conversely, VOO, detailed in its April 28, 2026, prospectus, serves as the ETF share class for the Vanguard 500 Index Fund, primarily focusing on large US-based corporations. Consequently, reallocating funds from VXUS to VOO directly shifts investment focus from international to domestic US markets. Such decisions should be deliberate and based on comprehensive investment strategies rather than merely chasing past performance figures.
A consistent trend across various timeframes highlights VOO's superior performance. Whether examining ten-year, five-year, one-year, or year-to-date returns up to October 16, 2026, VOO maintained its lead over VXUS. The ten-year period saw VOO ahead by 181.25 points, while the five-year window, starting October 15, 2021, showed an 83.56% return for VOO against 49.16% for VXUS, a 34.4-point difference. More recent, shorter periods, like the past year and year-to-date, also favored VOO, albeit with narrower margins. For instance, VOO gained 1.47% over the last month, while VXUS experienced a 2.14% decline. This consistent lead across all measured intervals indicates a sustained period of US market strength.
It's important to recognize that this analysis reflects a specific decade and its unique market conditions, providing a snapshot of past events rather than a predictor of future performance. The core rationale for including international stocks in a portfolio is their tendency to move independently of US equities, offering diversification benefits. During periods when US stocks surge, international holdings may naturally lag. The past ten years have been characterized by such an environment, where the US market has been a dominant force. Given that future market leadership is unpredictable, making investment decisions based solely on a decade of past returns for VXUS might undermine its fundamental role as a diversifier against US market fluctuations. International funds also carry a currency risk component, as the performance of underlying companies in local currencies, coupled with exchange rate movements against the dollar, impacts overall returns. For US investors, a stronger foreign currency enhances returns, while a weaker one diminishes them, a factor VOO does not contend with as its holdings are dollar-denominated.
For investors considering a portfolio rebalancing, especially those holding VXUS, there are tax implications to consider. Within tax-advantaged accounts like IRAs or 401(k)s, selling VXUS and purchasing VOO can be done without immediate tax consequences. However, in taxable accounts, realizing gains from selling VXUS would trigger capital gains taxes, reducing the capital available for reinvestment. A more tax-efficient approach might involve retaining existing VXUS shares and directing new investments towards VOO. This strategy gradually shifts the portfolio allocation without incurring immediate tax liabilities. Given the current prices of VOO ($701.63) and VXUS ($83.43), investors should also verify if their brokerage supports fractional share trading to ensure efficient deployment of capital.
Ultimately, the weighting of VXUS in a portfolio should align with an investor's specific goals. If growth is the primary objective, and given its past performance, a thorough review of VXUS's allocation might be warranted. If the aim is broader diversification to mitigate the impact of US market volatility, a smaller allocation to VXUS can still fulfill this purpose. The true benefit of international diversification materializes when global markets begin to outperform the US, underscoring the importance of maintaining some international exposure even during periods of domestic market dominance.
