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Company Size -- Why Market Capitalization Matters

Key Points


Stocks represent ownership in companies of various sizes. Some may be corporate giants with household names like Microsoft and General Electric. Others may be industry newcomers with revenue and resources a fraction the size of their larger brethren, but with the potential for rapid growth, as well as greater risk.

Understanding the relationship between company size, return potential, and risk is crucial if you're creating an investment strategy designed to help you pursue long-term financial goals. With that knowledge you'll be better prepared to build a balanced stock portfolio that comprises a mix of market caps.

Sizing Up Stocks

Typically, companies are categorized in one of three broad groups based on their size -- large-cap, midcap, and small-cap. Cap is short for market capitalization, which is the value of a company on the open market. To calculate a company's market capitalization, multiply its stock's current price by the total number of outstanding shares. For example, if a company issues one million shares of stock trading for $50 each, its market capitalization would be $50 million ($50 times 1,000,000 shares).

Definitions of the different market-cap categories may differ -- from one mutual fund company to another, for instance -- but here are some examples:

  • Large-cap company -- market value of $10 billion or more.
  • Midcap company -- market value between $3 billion and $10 billion.
  • Small-cap company -- market value of $3 billion or less.


Corporations with valuations of less than $1 billion are sometimes referred to as microcap companies. Of course, companies often grow and shrink in size with the passage of time. Microsoft, today one of the world's largest companies, was once run on a shoestring. And given the changing nature of the marketplace, who knows what tomorrow may bring?

Evaluating Risk and Reward Potential

Generally, market capitalization corresponds to where a company may be in its business development. So a stock's market cap may have a direct bearing on its risk/reward potential for investors looking to build a diversified portfolio of investments.

Large-cap stocks are generally issued by mature, well-known companies with long track records of performance. Large-cap stocks known as "blue chips" often have a reputation for producing quality goods and services, and a history of consistent dividend payments and steady growth. Large-cap companies are often dominant players within established industries, and their brand names may be familiar to a national consumer audience. As a result, investments in large-cap stocks may be considered more conservative than investments in small-cap or midcap stocks, potentially posing less risk in exchange for less aggressive growth potential.

Who'll Lead the Pack Next?
In recent years, small-cap indexes have outperformed large-cap indexes, although historically, they have taken turns leading the market. This chart ranks them in order of performance, from first place to third. Given the results, it may make sense to establish a diversified portfolio of investments representing different market capitalizations.
S&P 500 S&P MidCap 400 S&P SmallCap 600
2003 3 2 1
2004 3 1 2
2005 3 1 2
2006 1 3 2
2007 2 1 3
2008 3 2 1
2009 2 1 3
2010 3 2 1
2011 3 2 1
2012 3 2 1
Source: Standard & Poor's. Based on average annual total returns for the 10-year period ended December 31, 2012. Large-cap stocks are represented by the S&P 500; midcap stocks by the S&P Midcap 400 Index; and small-cap stocks by the S&P SmallCap 600 Index. Unmanaged indexes do not take into account the fees and expenses associated with investing, and individuals cannot invest directly in any index. Past performance cannot guarantee future results.


Midcap stocks are typically issued by established companies in industries experiencing or expected to experience rapid growth. These medium-sized companies may be in the process of increasing market share and improving overall competitiveness. This stage of growth is likely to determine whether a company eventually lives up to its full potential. Midcap stocks generally fall between large caps and small caps on the risk/return spectrum. Midcaps may offer more growth potential than large caps, and possibly less risk than small caps.

Small-cap stocks are issued by young companies that generally serve niche markets or emerging industries, such as those in the technology sector. Small caps are considered the most aggressive and risky of the three categories. The relatively limited resources of small companies can potentially make them more susceptible to a business or economic downturn. They may also be vulnerable to the intense competition and uncertainties characteristic of untried, burgeoning markets. On the other hand, small-cap stocks may offer significant growth potential to long-term investors who can tolerate volatile stock price swings in the short term.

Measuring Returns -- Using a Proper Index

A standard method of gauging the performance of an investment is to measure its returns against those of an index representing similar investments. Like stocks, indexes come in all sizes and shapes. Depending on its objective, an index may represent the performance of a limited number or a wide range of stocks from different sectors, industries, or geographic regions of the country or world. Among the most recognizable "market-cap" index providers are Standard & Poor's and Russell Investment Group.

To adequately measure how well or poorly an investment is doing, an index must represent equities that are comparable in nature to those under evaluation. It wouldn't be accurate to use a small-cap index to assess the performance of large-cap stock fund or vice versa, for example.

The Russell 2000 is a prominent index for small-cap stocks, while the Russell 1000 represents large-cap stocks. The S&P 500 is among the best known yardsticks for large-cap stocks. As their names suggest, the S&P MidCap 400 and S&P SmallCap 600 indexes represent midcap and small-cap stocks, respectively. One of the oldest benchmarks, the Dow Jones Industrial Average, represents the performance of 30 of the nation's most revered blue-chip stocks. Although the Dow is frequently referred to by the popular press, it represents only a tiny fraction of the stocks traded daily in the United States.

Each group of stocks may be influenced differently by current market conditions, underscoring the importance of diversification and the need to compare apples to apples. Individuals cannot invest directly in any index.


Selecting the Right Combination

So what does a company's size have to do with your investment strategy? Quite a bit. Over time, large-cap, midcap, and small-cap stocks have tended to take turns leading the market (see table). Each can be affected differently by market or economic developments. That's why many investors diversify, maintaining a mix of market caps in their portfolios. When large caps are declining in value, small caps and midcaps may be on the way up and could potentially help compensate for any losses.

To build a portfolio with a proper mix of small-cap, midcap, and large-cap stocks, you'll need to evaluate your financial goals, risk tolerance, and time horizon. A diversified portfolio that contains a variety of market caps may help reduce investment risk in any one area and support the pursuit of your long-term financial goals.

Keep in mind, diversification does not eliminate risk or the risk of potential loss.

Points to Remember

  1. Company size is often referred to as market capitalization, which is the value of a company on the open market.
  2. Market cap definitions vary, but in general large-cap companies have a cap of $10 billion or more; midcap companies have a cap between $3 billion and $10 billion; and small-cap companies have a cap of $3 billion or less.
  3. A stock's market cap may have a direct bearing on its risk/reward potential.
  4. A diversified portfolio that contains a mix of market caps may help reduce investment risk in any one area and support the pursuit of long-term financial goals.
  5. It's important to use the right index when gauging the performance of an investment in a particular market-cap category.
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