What is Small-Cap? (Plain English Definition)
Definition: Small-cap refers to companies with a market capitalization typically between $300 million and $2 billion, representing smaller, often faster-growing companies.
Small-Cap Explained Simply
Small-cap companies have market capitalizations generally between $300 million and $2 billion. These are typically younger, less established companies compared to their large-cap counterparts. Small-caps span every industry but are particularly prevalent in sectors like regional banking, biotechnology, and niche manufacturing.
Historically, small-cap stocks have offered a return premium over large-caps -- known as the small-cap premium or size factor. From 1926 to 2023, small-cap stocks returned approximately 2% more per year than large-caps. However, this premium has been inconsistent, with large-caps outperforming for extended periods, particularly in the 2010s when mega-cap technology companies dominated.
Small-cap investing involves higher volatility, less analyst coverage, wider bid-ask spreads, and more company-specific risk. Individual small-cap companies are more likely to fail than large-caps, making diversification through ETFs especially important. Small-cap ETFs typically hold 500-2,000 stocks to spread this risk.
Small-Cap Example
The iShares Russell 2000 ETF (IWM) holds about 2,000 small-cap stocks with a median market cap around $1 billion. These are companies most investors have never heard of -- small regional banks, niche manufacturers, and early-stage biotech firms. While IWM returned about 10% annually over the past 20 years compared to roughly 10.5% for the S&P 500, small-caps provided diversification benefits since they do not always move in sync with large-caps.
Why Small-Cap Matters for ETF Investors
Small-cap ETFs provide access to a segment of the market that offers diversification benefits and potential for higher long-term returns. Many of today's large-cap giants were small-caps a decade or two ago, so small-cap ETFs give you exposure to the potential next generation of market leaders. For ETF investors, a modest allocation of 10-20% in small-cap ETFs can complement a large-cap core position. Small-caps tend to perform particularly well during economic recoveries and periods of domestically-focused growth. However, they also tend to decline more sharply during recessions, so your small-cap allocation should match your risk tolerance.
Small-Cap vs Market Capitalization
| Small-Cap | Market Capitalization |
|---|---|
| Small-cap refers to companies with a market capitalization typically between $300 million and $2 billion, representing smaller, often faster-growing companies. | See full definition of Market Capitalization |
While small-cap and market capitalization are related concepts, they serve different purposes in the world of ETF investing. Understanding both terms helps you make more informed decisions about which funds to include in your portfolio and how to evaluate their performance.
Related Terms
Deepen your understanding of ETF investing by exploring these related concepts:
Market Capitalization
Market capitalization is the total value of a company's outstanding shares, calculated by multiplying the stock price by the number of shares.
Large-Cap
Large-cap refers to companies with a market capitalization typically above $10 billion, representing the biggest and most established publicly traded companies.
Mid-Cap
Mid-cap refers to companies with a market capitalization typically between $2 billion and $10 billion, positioned between large and small companies in size.
Russell 2000 Index
The Russell 2000 is a stock market index that tracks the performance of 2,000 small-cap U.S. companies, serving as the primary benchmark for small-cap investing.
Growth Investing
Growth investing is a strategy focused on buying stocks of companies expected to grow their earnings faster than the overall market.
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