Over 60% of small cap investors use passive funds, but we strongly believe this is a missed opportunity, as small caps have consistently been one of the most reliable sources of alpha available in the public markets.

Abstract

Over 60% of capital currently allocated to small cap stocks is invested in passive vehicles, but historical data unequivocally shows that there is more opportunity for alpha (i.e., market outperformance) in small caps than in any other segment of the publicly traded equity markets. 

In this paper, we explain that this persistent outperformance is due to structural advantages in the small cap market, rather than luck or random chance. Specifically, it is less efficient than either the mid or large cap markets, and it possesses a higher volume of rapidly growing companies than those other markets. 

We also provide several long-term historical charts demonstrating that managers have consistently had more success generating alpha in the small cap market than in the large or mid cap markets.

Finally, we briefly discuss why favorable valuations make small caps attractive in the current environment.

Looking for Alpha in All the Wrong Places

Passive strategies have been taking market share from actively managed funds for decades, and the trend is most pronounced for small caps. Currently, 62% of small cap funds are passive, compared to 40% in 2014. Large caps have the next highest proportion, at 58%, while just 44% of mid cap funds are passive.

In our view, investors who opt for passive small cap exposure are making a costly error, as they are ignoring one of the most reliable sources of alpha available in the public markets. Historical data consistently shows that small cap managers have outperformed their benchmarks by a materially wider margin than either large or mid cap managers. The chart below from Morgan Stanley quantifies the cumulative alpha produced by small cap managers versus mid and large cap managers over roughly the past 30 years, and the results are clear. (Note that this is just one of multiple corroborating data points we will discuss in this paper.)  

Source: Morningstar, Morgan Stanley Wealth Management Global Investment Office. Data through 8/31/2024. See disclosures for standardized performance.

Past performance does not guarantee future results.

We strongly believe that this persistent outperformance is due to structural advantages in the small cap market and that manager skill contributes to small cap alpha generation far more than luck or random chance.

An Inefficient Market

One major reason that small cap managers have more success outperforming their benchmarks is that the small cap market is generally less efficient than other segments of the equity market. This means a greater proportion of securities are mispriced, which creates opportunities for managers to find promising companies at discounted valuations. 

Lighter Analyst Coverage

Perhaps the biggest reason the small cap market is less efficient is that analyst coverage is consistently lighter than in either the large or mid cap markets. 

When a company has many analysts reviewing its financials and regularly meeting with senior leadership, much more is known about its growth potential as well as its challenges. That information is available to managers, who generally use it as a starting point for their own research.

But for companies that lack that level of coverage, particularly if they are younger with shorter track records, managers have to do much more independent analysis. Each manager uses their own approach and prioritizes different attributes, and they can arrive at starkly divergent conclusions about a company’s prospects. (Note that we have previously written about the implications of lighter analyst coverage.)

The chart below shows the average number of analysts per stock for the large, mid, and small cap sectors. As you can see, small caps have six per company, compared to 17 and 30 for mid and large caps, respectively. Also, this relationship is quite stable. According to Bank of America, in 1999 the numbers were nearly identical to today.

Source: FactSet. Based on stocks in Russell indices.

Underappreciated Upside Potential

Another reason the small cap market is less efficient is that smaller companies are frequently innovative businesses that produce novel products that do not yet exist in the marketplace, which makes it more challenging to estimate how strong demand will be for their goods and services. Managers who identify adoption trends early are often able to generate strong returns as other investors eventually follow the crowd and drive up the share price.

One good example is a company called Insulet (PODD), which we used to own. The company was the first in the industry to offer disposable insulin pumps that could be controlled through a smartphone app. Previously, patients either needed to administer insulin shots manually, or wear an attached pump that required cumbersome tubing.

A tubeless, disposable system was certainly an appealing idea, as it simplified the insulin delivery process. But when it was new, it was still unproven, and adoption was slow. Moreover, the company was aggressively scaling up its marketing efforts to attempt to take share from incumbents, so it was losing money even as revenues were growing.

Investors were skeptical at first, and the company’s stock did not do much for the first several years after its 2007 IPO. But those who recognized the potential early were rewarded for their patience. Starting around 2016, the technology began to gain significant traction and demand surged, which sent the share price soaring. 

This type of upside is  more common in small caps than mid or large caps, as most larger companies are well established, so expectations about their future growth rates are less varied.

Misunderstood Models

In addition, many small cap companies fly under the radar while they reinvent their business models. Skilled managers who find these opportunities before they are widely discovered are generally rewarded with excellent returns.

An example of this came about recently in our portfolio with an aerospace company called FTAI Aviation (FTAI). The company started out as a traditional lessor of jet engines, but over time it added a maintenance and repair business that proved to be faster growing and more lucrative. FTAI pioneered a technique for refurbishing engines called a “module swap,” where they break down used engine components into standalone modules that can be installed quickly. The process is significantly simpler and faster for the customer, who previously needed to take their planes offline for much longer while the engines were in the shop.

From its IPO in 2015 through 2022, while the company was primarily a lessor, FTAI’s stock did not move much. But once the market began to notice the positive effects of the repair business and the strong increase in customer demand, its share price took off, rallying for almost 24 straight months.

This scenario is more common among small caps because these kinds of changes have a larger proportional impact on revenues. Bigger companies can add a division or make a strategic acquisition to increase growth, but typically the effect will be marginal relative to the overall revenue stream. For a smaller business like FTAI, this type of pivot can change the company’s entire financial profile.

A Target-Rich Environment

Not only is the market for small caps less efficient, but it also tends to contain a higher number of companies that are capable of outperforming. There are two main reasons for this. First, the small cap market is much bigger than the mid and large cap markets (i.e., it has many more individual companies), so it contains more businesses with attractive fundamentals. Second, there is a greater dispersion of returns between the stronger and weaker companies, which means managers who correctly identify winners will have a bigger performance advantage over the benchmark.

A Blend of Quantity and Quality

For the past 15 years, small caps have consistently produced more rapidly growing, profitable firms than other markets.

As you can see from the chart below, there are significantly more companies with a combination of high sales growth and high profitability (both above 7%) below $20 billion than above. (Note that the vast majority of the positions in our portfolio are below $20 billion.)

Source: FactSet. The universe consists of U.S. stocks with a market cap at or above $100 million, an average 1-year ROA at or above 7%, and a 3-year annualized sales growth at or above 7%.

Past performance does not guarantee future results.

Looking at top-line growth and profitability together typically paints a clearer picture about a company’s prospects than looking at either metric in isolation. A fast-growing company that is not profitable could operate an inherently low-margin business that cannot benefit from economies of scale, regardless of how large it becomes. Alternatively, a profitable company that is slow growing may never achieve the level of demand required to generate rapid top-line growth.

As mentioned above, the small cap universe contains far more companies than the other market segments, which is why there are so many more attractive opportunities. It also helps explain why small cap managers are more likely to outperform their benchmarks. To borrow a sports reference, there are more shots on goal. 

Broad Dispersion of Returns

Another feature of the small cap market is that it typically produces a much wider dispersion of returns between the top and bottom performers than exists in the large cap market. As you can see in the chart below, the spread between the rolling 12-month returns of the top and bottom performers is materially higher for the Russell 2000 index than for the S&P 500.

Source: FactSet

This suggests not only that the stronger small cap companies are generating higher returns than the stronger large cap companies, but the weaker ones are likely lagging more than the large cap laggards. In other words, the small cap index is being dragged down more by the poor performers than the large cap index is, so small cap managers who simply avoid those stocks will be in a better position to beat their benchmark.

Historical Data is Consistent 

Historical performance data unequivocally shows that managers have had more success generating alpha in the small cap market than in the large or mid cap markets. In this section we review several different data points that tell the same basic story.

First, as we discussed earlier, according to Morgan Stanley, small caps have generated substantially more alpha than large and mid caps over the past three decades. That chart is rather striking and makes the point quite clearly – the cumulative outperformance of the median manager in the small cap market is nearly 60%, while their large and mid cap counterparts have each lagged their benchmarks by roughly 15%.

Looking at a shorter time horizon, in eight of the past ten years, a higher percentage of small cap managers have outperformed their benchmark than large cap managers.

Source: eVestment. Small Cap reflects the Russell 2000 index versus the Morningstar Open-end Funds – Small Blend universe. Large Cap reflects the S&P 500 index versus the Morningstar Open-end Funds – Large Blend universe.

The next set of charts presents the data a little differently, but the results are the same. The dot within each bar is the index return for each time horizon, and the area above the dot indicates the percentage of active managers that have outperformed the index.

The first pair of charts below shows small cap blend managers vs. large cap blend managers. As you can see, essentially half or more of actively managed small cap funds outperform in all time horizons, and in the five-year category, nearly 70% of managers outperformed. Conversely, in the large cap universe, less than 25% of actively managed funds have been able to outperform in any time period, and in the 10-year and 15-year categories, less than 7% were able to do it.

Source: eVestment

Source: eVestment

In the next pair, we compare small cap growth managers to large cap growth managers. As you can see, small cap growth managers have fared even better relative to the index than small cap blend managers, particularly over longer horizons. In the 10-, 15-, and 20-year categories, 70%, 59%, and 65% of actively managed funds outperformed the index.

While large cap growth managers performed a little better relative to index than their blended counterparts, still only a small fraction outperformed beyond the 3-year period.

Source: eVestment

Source: eVestment

Final Thoughts

The historical data clearly shows that small cap stocks have provided investors with the best opportunity to generate alpha over the past few decades, which we believe is due to the structural advantages we have discussed above.

In addition, data from Bank of America shows that since 1925, small caps have delivered close to 16% annually, while mid caps and large caps have delivered 14% and 12%, respectively. In other words, small caps have historically delivered not only the best relative performance, but also the best absolute performance.

Nonetheless, successful investing is about looking forward, not backward, as we all know that past performance does not guarantee future returns. Fortunately, we believe that the small cap market is particularly attractive right now, as valuations have been falling relative to large caps for the past several years. Below we have plotted the average P/E ratio of fast growing, profitable companies above and below $20 billion for the past 20 years, and you can see that the gap between them has been growing wider since roughly 2018.  

Source: FactSet. The trailing 12-month P/E reflects the harmonic average. The universe consists of U.S. stocks with a market cap at or above $100 million, an average ROA at or above 7%, and a 3-year annualized sales growth at or above 7%. 

Past performance does not guarantee future results.

All else equal, we believe equity investors should prefer stocks when their multiples are lower as they have historically demonstrated greater resilience during periods of market stress and are more inclined to deliver long-run price gains because their multiples still have room to expand. This is particularly true for high quality growth companies.

In summary, we believe there is a plethora of evidence suggesting not only that small cap investors should utilize active strategies, but also that they should feel comfortable allocating to small caps in the current market environment. 

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Originally Posted on September 26, 2025 – Small Cap Investing: Act on Active, Pass on Passive