Market capitalization
Market capitalization, sometimes referred to as market cap, is the total value of a publicly traded company's outstanding common shares owned by stockholders.
Market capitalization is equal to the market price per common share multiplied by the number of common shares outstanding.
Description
Market capitalization is sometimes used to rank the size of companies. It measures only the equity component of a company's capital structure, and does not reflect management's decision as to how much debt is used to finance the firm. A more comprehensive measure of a firm's size is enterprise value, which gives effect to outstanding debt, preferred stock, and other factors. For insurance firms, a value called the embedded value has been used.It is also used in ranking the relative size of stock exchanges, being a measure of the sum of the market capitalizations of all companies listed on each stock exchange. The total capitalization of stock markets or economic regions may be compared with other economic indicators. The approximate total market capitalization of all publicly traded companies was:
- 2023: US$48.98 trillion
- 2024: US$62.19 trillion
- October 3rd 2025: US$69.244 trillion
Historical estimates of world market cap
Calculation
Market cap is given by the formula, where MC is the market capitalization, N is the number of common shares outstanding, and P is the market price per common share.For example, if a company has 4 million common shares outstanding, and the closing price per share is $20, its market capitalization is then $80 million. If the closing price per share rises to $21, the market cap becomes $84 million. If it drops to $19 per share, the market cap falls to $76 million. This is in contrast to mercantile pricing where purchase price, average price and sale price may differ due to transaction costs.
Not all of the outstanding shares trade on the open market. The number of shares trading on the open market is called the float. It is equal to or less than N because N includes shares that are restricted from trading. The free-float market cap uses just the floating number of shares in the calculation, generally resulting in a smaller number.
Market cap terms
Traditionally, companies were divided into large-cap, mid-cap, and small-cap. The terms mega-cap and micro-cap have since come into common use, and nano-cap is sometimes heard. Large caps have a slow growth rate as compared to small caps. Different numbers are used by different indexes; there is no official definition of, or full consensus agreement about, the exact cutoff values. The cutoffs may be defined as percentiles rather than in nominal dollars. The definitions expressed in nominal dollars need to be adjusted over decades due to inflation, population change, and overall market valuation, and market caps are likely to be different country to country.In the United States
's investor education materials state that the following is a typical categorization of stocks by market capitalization:The U.S. Securities and Exchange Commission notes that nano-cap stocks, in cases when they're separated from micro-caps, are typically defined as stocks with a market capitalization less than $50 million ; which is equivalent to less than $ million in.
S&P Dow Jones Indices defines 3 major US indices segmented by market capitalization. The components of these indices are selected by committee, but in order to be eligible, among other requirements, a stock's market capitalization at the time of addition must be within the respective range in the following table:
| Index | Category | Market capitalization required for addition |
| S&P 500 | Large-cap | ≥ US$20.5 billion |
| S&P 400 | Mid-cap | $7.4 billion$20.5 billion |
| S&P 600 | Small-cap | $1 billion$7.4 billion |
These market cap eligibility criteria are only for addition to these indices, not for continued membership in an index. As a result, an S&P index constituent that appears to violate criteria for addition to that index is not removed unless ongoing conditions warrant an index change.