Small Companies Have Doubled the S&P 500’s Gain This Year

In the world of finance, the battle between David and Goliath is playing out in the stock market. While tech giants with trillion-dollar market caps dominate the headlines, smaller companies known as micro caps are quietly outperforming them.

Market caps, which measure the total value of a company’s issued shares, are a key indicator of a company’s size and influence in the market. Mega caps, with market caps exceeding $200 billion, are well-known giants that often drive market trends. However, in 2026, it’s the micro caps – those with market caps below $300 million – that are stealing the show.

The Russell Microcap Index, which tracks the performances of the smallest companies in the U.S. stock market, has seen a remarkable surge this year. In May, the index hit an all-time high, outperforming the S&P 500 by more than double in terms of returns.

The appeal of micro caps lies in their ability to shield investors from tariff and concentration risks. Mega caps, due to their massive size, dominate indices like the S&P 500. The top 10 companies in the S&P 500 account for 40% of its weighting, leading to concentration risk for investors.

Last year, a tech selloff that affected mega caps led to a market rotation that favored micro caps. As a result, micro caps outperformed major indices for four consecutive quarters. The Russell Microcap Index gained over 57% in the past year, compared to the S&P 500’s 27% gain.

Despite a recent winning streak for the S&P 500, concentration risk remains a concern for investors. The index’s heavy reliance on a few mega-cap companies leaves it vulnerable to market fluctuations. In contrast, micro caps offer diversification and the potential for strong returns.

For investors looking to capitalize on the success of micro caps, it’s important to understand the differences between mega caps and micro caps. While mega caps drive market trends, micro caps offer unique opportunities for growth and diversification. By considering the performance of micro caps and the risks associated with mega caps, investors can make informed decisions to build a balanced and resilient portfolio. In the past week, the stock market saw a significant gain, with five companies – Nvidia, Micron, Apple, Advanced Micro Devices, and Intel – accounting for 75% of the increase. However, investors are becoming cautious of the high valuations of large-cap and mega-cap stocks, leading to a shift towards smaller companies.

This flight to safety not only resulted in a move away from tech stocks but also saw a surge in investments in small and micro-cap companies. These companies, with valuations ranging from $250 million to $2 billion, are expected to outperform in the current market environment due to several favorable factors.

One such advantage for micro caps is their limited international exposure. Most smaller companies generate the majority of their revenue domestically, which reduces their sensitivity to global factors such as tariffs and slowing economic growth. According to Adam Turnquist, chief technical strategist for LPL Financial, micro caps are projected to see a return to earnings growth this year, with revenue forecasts trending upwards through 2027.

Charts comparing the Russell Microcap Index with the S&P 500 since April 2025 indicate a breakout for micro caps, with sustained improvement in relative strength suggesting further potential for growth. However, it’s essential to note that investing in micro caps comes with inherent risks.

Research from Franklin Templeton shows that when the annualized five-year returns of small and micro-cap stocks are 5% or less, subsequent three- and five-year returns have been positive 100% of the time. Despite this positive trend, micro caps are more volatile and less stable than large-cap companies.

Unlike mega-cap stocks with established competitive advantages, micro caps lack strong moats, making them financially unstable and susceptible to headline risks. Additionally, the lower trading volume and liquidity of micro caps make them highly speculative investments, with no guarantee of a buyer when selling shares.

While mega-cap stocks continue to attract investor attention, the strength of micro caps as an investment option should not be underestimated. It is crucial for investors to understand the risks associated with investing in micro caps before allocating funds towards them. With the current market dynamics favoring smaller companies, the outlook for micro caps remains positive in the long term.