U.S. equities have seen a stark divergence between large-cap and small-cap performances so far this year. The S&P 500 has gained 9.8% on a year-to-date basis, though its rally has been marred by sharp volatility amid geopolitical unrest. In a striking contrast, the Russell 2000, the benchmark for U.S. small-cap stocks, has climbed nearly 18%, handily outperforming the large-cap index.
The performance gap stems largely from differing revenue profiles among their constituent companies. The S&P 500 is composed of America’s largest corporations, many of which generate substantial income from overseas markets, leaving them vulnerable to global geopolitical shocks. By comparison, most firms in the Russell 2000 rely primarily on domestic revenue, effectively insulating them from external conflicts and laying a solid foundation for their strong run. Beyond revenue advantages, the small-cap index boasts a well-balanced structure across 11 market sectors, with industrials, healthcare and financials taking the top weightings rather than being dominated by a single industry. Its linked exchange-traded fund also features highly diversified holdings: the top ten components account for just 6.7% of the total portfolio, limiting swings driven by individual stocks.
A set of favorable factors has further fueled the small-cap rally. Booming demand across the artificial intelligence sector has brought robust growth opportunities to numerous Russell 2000 constituents. Some energy firms supply clean energy solutions for AI data centers, with one company seeing its share price soar 1,400% over the past 12 months. Other players focus on semiconductors and networking components for data centers, tapping into the AI industry’s expansion. Additionally, tariff policies and eased regulations have helped cut operating costs for domestic businesses, adding more momentum to the small-cap rally.
For all their strong gains, small-cap stocks now face notable headwinds led by rebounding inflation and growing rate hike expectations. Driven by rising oil prices, U.S. inflation has picked up notably. The annualized growth of the Consumer Price Index hit 3.8% in April, a three-year high and nearly double the Federal Reserve’s 2% annual inflation target. Market participants widely expect the Fed to raise interest rates by January 2027.
Small-cap enterprises are far more susceptible to higher interest rates than large corporations. Roughly 32% of companies within the Russell 2000 carry floating-rate debt. Once rates move higher, their borrowing costs will rise immediately, squeezing corporate profits. Higher rates will also curb their ability to secure additional financing and hinder business expansion. The impact is far milder for the S&P 500, where only 6% of its component firms hold floating-rate liabilities.
While U.S. small-cap stocks have delivered impressive returns this year, downward pressure from a potential rate hike cycle has become increasingly evident.
