Market Capitalization: What It Is and Why It Matters
Market capitalization, often called market cap, is a way of measuring the total market value of a publicly traded company. It is commonly used to compare the relative size of companies and to group them into categories such as large-cap, mid-cap and small-cap.
What Is Market Capitalization?
Market capitalization represents the total value that the stock market assigns to a company's outstanding shares at a particular point in time. It changes as the company's share price changes and can also change when the number of shares outstanding changes.
Market Capitalization = Current Share Price × Total Number of Outstanding Shares
For example, if a company has 10 million outstanding shares and each share is trading at $50, its market capitalization would be $500 million.
10,000,000 shares × $50 per share = $500,000,000 market capitalization.
Why Market Capitalization Matters
A company's share price alone does not tell you how large the company is. A company with a share price of $1,000 may be smaller than another company whose shares trade at $100 if the second company has significantly more outstanding shares.
Market capitalization provides a broader measure of company size because it considers both the share price and the number of shares outstanding.
Large-Cap Companies
Large-cap companies generally have relatively high market capitalizations compared with other publicly traded companies in a market. These businesses are often more established, although size alone does not determine future performance or investment risk.
Large companies can still experience significant changes in share prices, business conditions and profitability.
Mid-Cap Companies
Mid-cap companies generally fall between large-cap and small-cap companies based on market value. They may represent businesses at different stages of growth and maturity.
The risks and opportunities associated with a mid-cap company can vary widely depending on its industry, financial position, competition and broader economic conditions.
Small-Cap Companies
Small-cap companies generally have lower market capitalizations than large-cap and mid-cap companies. Some may be earlier in their development or operate in more specialized markets.
Smaller companies can sometimes experience greater price volatility and may have different risks related to liquidity, business concentration or financial resources.
Market Capitalization Is Not the Same as Company Value
Market capitalization is based on the market price of a company's publicly traded shares. It should not automatically be treated as a complete measure of the company's economic value.
Other factors, such as debt, cash, assets, profitability and future business expectations, may also be important when evaluating a company.
Can Market Capitalization Change?
Yes. Market capitalization can change every day because share prices can rise or fall during market activity.
For example, if the number of outstanding shares remains the same but the share price increases, the company's market capitalization also increases. If the share price falls, the market capitalization decreases.
Market Cap and Investment Risk
Market capitalization can provide useful context, but it does not guarantee that a particular investment is safe or risky. Companies of every size can face business challenges, market declines and unexpected events.
Investment decisions may require consideration of additional factors such as diversification, financial goals, time horizon and individual risk tolerance.
Key Takeaways
- Market capitalization measures the market value of a company's outstanding shares.
- It is calculated using share price multiplied by the number of outstanding shares.
- It helps investors compare the relative size of publicly traded companies.
- Large-cap, mid-cap and small-cap categories can provide useful context.
- Market capitalization alone does not determine whether an investment is good, safe or likely to perform well.