Small-cap U.S. stocks are emerging as a rare pocket of broad-based strength in 2026, outpacing large-cap peers as investors rotate toward domestically focused companies. “The S&P 600… [has] a much broader representation of the U.S. economy,” said Mike Dickson, head of research and quantitative strategies at Horizon Investments, in an interview with AInvest’s Capital & Power, pointing to the index’s diversified exposure beyond mega-cap technology.
A recent Horizon Investments research note titled "It's a Small Cap Party!" highlights the scale of that divergence. The S&P SmallCap 600 Index has outpaced the average stock in the S&P 500 by 7.6 percentage points on a year-to-date basis as of late April, according to the report. Small-caps are also outperforming the Nasdaq 100 by 5.3 percentage points over the same period, reflecting a shift in market leadership away from a narrow group of large technology companies.
The contrast is particularly striking given the concentration at the top of the large-cap market. Horizon noted that the S&P 500 “is once again being driven higher by a limited group of stocks, namely big tech and mega-caps,” while the majority of stocks in the index have delivered relatively modest returns. In that environment, the S&P 600’s broader composition has translated into more widespread gains across sectors.
Recent market dynamics underscore that divergence. Shares of large technology companies have continued to dominate benchmark indexes, but their influence has also drawn increased scrutiny. “They still are the straw that stirs the drinks on big index funds,” said Chuck Carlson, chief executive of Horizon Investment Services, a different firm than Dickson's, according to Reuters. At the same time, smaller companies have shown sensitivity to shifts in macro sentiment. The S&P SmallCap 600 rose sharply following news of a U.S.-Iran cease-fire before giving back some gains, reflecting both investor enthusiasm and volatility in cyclical segments of the market, MarketWatch reported.
Dickson said the strength in small-caps reflects both earnings trends and structural differences in index composition. Companies in the S&P 600 tend to be concentrated in sectors such as industrials, financials and consumer discretionary, rather than the technology-heavy makeup of large-cap benchmarks. As a result, he said, the index captures a more cyclical cross-section of the economy.
“They have been on an absolute tear this year,” Dickson said, adding that the divergence has become more pronounced in recent weeks as “mega-cap tech [is] leading at the top and the rest of the S&P 500 kind of staying flat.”
Earnings momentum has also played a central role. Dickson said the small-cap universe is experiencing an “earnings inflection higher,” with growth in the S&P 600 running at “close to 20 percent year over year,” gains he described as broad-based across industries.
Valuation dynamics further support investor interest. Small-cap stocks trade at a discount to their larger peers, with Dickson citing price-to-earnings multiples of “around a 15 or 16 P/E multiple,” compared with “23 or 24 for the Nasdaq and top of the market.” That gap has encouraged investors to seek opportunities outside of higher-priced technology names.
Horizon’s note also attributes part of the outperformance to macroeconomic conditions. Because smaller companies generate a larger share of their revenue domestically, they are “benefitting disproportionately from the strong U.S. economic environment,” the firm wrote.
The rally in small caps has coincided with a shift in market breadth. Earlier in the year, the S&P 500 Equal Weight Index had been outperforming the traditional capitalization-weighted index, but that advantage has largely faded. According to Horizon, the S&P 600 has effectively “taken the baton” as the primary driver of broader participation in equity gains.
Despite their recent performance, small-cap stocks remain underrepresented in many portfolios. Dickson said they are often overlooked because of their relatively small size and lower visibility compared with household-name technology companies. Many operate within supply chains or niche industries and receive less attention from investors, even as they contribute to broader economic activity.
The sustainability of the small-cap rally may depend on continued economic resilience. Horizon pointed to upcoming gross domestic product data as a key indicator of whether the conditions supporting smaller, domestically oriented companies remain intact. Continued strength, the firm said, would reinforce the case for cyclical segments of the market to maintain their leadership.
For now, the performance gap suggests that investors are increasingly looking beyond a concentrated group of large-cap stocks, with small caps emerging as a central component of market gains in 2026.