Small-Cap Stocks: A Potential Area of Opportunity
Building a well-diversified investment portfolio often involves balancing risk and return across a variety of asset classes, sectors, and geographies. Investors regularly evaluate historical performance, volatility, correlations between investments, and long-term growth potential to determine how different asset classes may contribute to overall portfolio objectives.
For many years, small-cap stocks were widely viewed as an important component of that equation. Their relatively smaller size, greater growth potential, and market inefficiencies historically allowed them to outperform larger companies over longer investment horizons. Although small-cap equities have traditionally carried higher levels of volatility, they have also been recognized for their ability to potentially enhance diversification and generate long-term returns. (1)
Why Small-Cap Stocks Continue to Matter
Small-cap companies generally represent businesses with market capitalizations ranging from approximately $300 million to several billion dollars. The asset class gained prominence following World War II alongside the growth of mutual funds and the increasing adoption of modern portfolio construction principles, including Harry Markowitz's Modern Portfolio Theory. The launch of the Russell 2000® Index during the 1980s further established small-cap investing as a recognized segment within diversified equity portfolios. (1)
Recent years have brought considerable attention to the relative underperformance of smaller companies. Structural changes have reduced the number of publicly traded businesses while also creating profitability challenges within certain areas of the U.S. small-cap market. Although these factors are unlikely to disappear quickly, the broader fundamental environment appears to be improving. (2)
Lower interest rates and strengthening economic conditions are supporting increased merger and acquisition activity, while the market for initial public offerings (IPOs) has begun to regain momentum. As new companies enter public markets and investor interest broadens to include emerging small- and mid-cap businesses, valuation support may improve. Even so, investors should continue monitoring the broader U.S. economic outlook, as macroeconomic conditions remain important. (2)
Valuations Suggest Small Caps May Offer Long-Term Opportunity
Following the strong growth-driven market environment of 2021, small-cap companies experienced an extended period of earnings pressure that lasted for nearly three years. Today, the market reflects unusually wide valuation gaps between the largest companies and the broader small-cap universe.
The combined market value of the five largest companies in the S&P 500 is now approximately five times greater than the total market capitalization of the Russell 2000 Index. (1)
Likewise, the Russell 2000 represents only about 5.5% of the S&P 500's total market capitalization, the lowest proportion on record. Its weight within the Russell 3000® Index has also declined to roughly 3%, levels not seen since the 1930s. (1)
Although absolute valuations for small-cap stocks remain near their long-term historical averages, relative valuations appear increasingly attractive. According to the Jefferies small-versus-large valuation model, small caps currently rank in the 5th percentile, with lower percentiles indicating more attractive relative valuations. This level has only previously been reached during the early 2000s. Additional market data similarly suggests that U.S. small-cap stocks currently trade at favorable valuations relative to both large-cap U.S. companies and comparable international markets. (1)
Historically, improving economic conditions have often created favorable environments for small-cap stocks. Periods of accelerating business activity, monetary easing, and improving corporate earnings have frequently coincided with stronger relative performance among smaller companies. Lower borrowing costs may improve profitability while reducing financing expenses, potentially creating additional support for earnings growth. (1)
Small-cap stocks may experience larger swings in investor sentiment due to lower trading volumes and more limited analyst coverage than larger companies. During the summer of 2024, investor sentiment toward the asset class reached historically depressed levels. Following indications from the Federal Reserve that interest rate cuts were likely beginning in September, investor interest shifted rapidly toward small-cap stocks, leading the Russell 2000 to outperform the S&P 500 during the second half of the year. (1)
Artificial Intelligence Could Create New Opportunities for Small-Cap Companies
While the first phase of artificial intelligence investment has largely benefited the largest technology companies, the next stage of AI adoption may create meaningful opportunities for smaller businesses capable of applying AI to improve products, services, and operational efficiency. (2)
The continued expansion of AI infrastructure also creates potential opportunities beyond software developers. Companies that manufacture electrical equipment, specialize in heating and cooling systems, or supply highly specialized industrial components may benefit from the long-term investment required to support AI data centers and related infrastructure. Taiwan's semiconductor ecosystem is one example, where many smaller technology companies appear well positioned to participate in ongoing AI-related capital spending. (2)
At the same time, investors should remain selective. Certain smaller technology companies, particularly those associated with highly speculative themes such as quantum computing, have experienced sharp price appreciation driven more by market enthusiasm than underlying fundamentals. In these areas, careful security selection remains essential, with greater emphasis potentially placed on companies that demonstrate sustainable competitive advantages and durable business models rather than short-term momentum. (2)
Looking Beyond Today's Market Leaders
Markets are constantly evolving, and periods of uncertainty often create new investment opportunities. Despite recent challenges, small-cap stocks may offer some diversification benefits, long-term growth potential, and access to a broader universe of companies. (1)
As market leadership broadens beyond today's mega-cap technology companies, small-cap equities may be well positioned to benefit throughout 2026 and beyond. For long-term investors, an active and disciplined investment approach remains important. Focusing on high-quality businesses with strong earnings growth, healthy cash flow generation, and recurring revenue streams may help identify companies that are positioned to create lasting shareholder value while strengthening overall U.S. equity exposure. (1)
Article Sources:
(1) Hathaway, Tim. “Small Wonders: Embracing U.S. Small Caps.” Brown Advisory, July 17, 2025.https://www.brownadvisory.com/us/insights/small-wonders-embracing-us-small-caps/. Accessed July 7, 2026.
(2) Vohora, Ritu. “Three big reasons why smaller stocks deserve attention.” T. Rowe Price, November 2025. https://www.troweprice.com/en/us/insights/three-big-reasons-why-smaller-stocks-deserve-attention. Accessed July 9, 2026.