Market capitalization, sometimes referred to asmarket cap, is the total value of apublicly traded company'soutstanding common shares owned by stockholders.[2]
Market capitalization is equal to themarket price per common share multiplied by the number of common shares outstanding.[2][3][4]
Market capitalization is sometimes used to rank the size of companies. It measures only the equity component of a company'scapital structure, and does not reflect management's decision as to how muchdebt (orleverage) is used to finance the firm. A more comprehensive measure of a firm's size isenterprise value (EV), which gives effect to outstanding debt, preferred stock, and other factors. For insurance firms, a value called theembedded value (EV) has been used.
It is also used in ranking the relative size ofstock exchanges, being a measure of the sum of the market capitalizations of all companies listed on each stock exchange. The total capitalization ofstock markets oreconomic regions may be compared with othereconomic indicators (e.g. theBuffett indicator). The approximate total market capitalization of all publicly traded companies was:
Total market capitalization of all publicly traded companies in the world from 1975 to 2020.[8]
| Year | World market cap | Number of listed companies | |
|---|---|---|---|
| (in mil. US$) | (% ofGDP) | ||
| 1975 | 1,149,245 | 27.2 | 14,577 |
| 1980 | 2,525,736 | 29.6 | 17,273 |
| 1985 | 4,684,978 | 47.0 | 20,555 |
| 1990 | 9,519,107 | 50.8 | 23,732 |
| 1991 | 11,340,785 | 56.8 | 24,666 |
| 1992 | 10,819,256 | 50.2 | 24,947 |
| 1993 | 13,897,390 | 61.7 | 28,300 |
| 1994 | 14,639,924 | 60.9 | 30,290 |
| 1995 | 17,263,728 | 64.0 | 33,379 |
| 1996 | 19,806,691 | 72.3 | 35,617 |
| 1997 | 22,029,761 | 80.7 | 36,946 |
| 1998 | 24,555,201 | 89.6 | 37,928 |
| 1999 | 33,181,159 | 115.1 | 38,414 |
| 2000 | 30,925,434 | 101.1 | 39,892 |
| 2001 | 26,792,162 | 88.4 | 40,157 |
| 2002 | 22,802,792 | 72.7 | 38,894 |
| 2003 | 31,107,425 | 84.9 | 41,051 |
| 2004 | 36,540,980 | 89.2 | 38,724 |
| 2005 | 40,512,446 | 92.6 | 39,096 |
| 2006 | 50,074,966 | 106.1 | 43,104 |
| 2007 | 60,456,082 | 114.0 | 44,034 |
| 2008 | 32,418,516 | 56.2 | 43,949 |
| 2009 | 47,471,293 | 83.8 | 42,669 |
| 2010 | 54,259,518 | 87.3 | 43,427 |
| 2011 | 47,521,341 | 68.8 | 44,323 |
| 2012 | 54,503,237 | 78.4 | 43,772 |
| 2013 | 64,367,842 | 89.0 | 44,853 |
| 2014 | 67,177,254 | 90.3 | 45,743 |
| 2015 | 62,268,184 | 94.5 | 43,983 |
| 2016 | 65,117,714 | 97.1 | 43,806 |
| 2017 | 79,501,948 | 111.1 | 43,440 |
| 2018 | 68,893,044 | 91.9 | 43,554 |
| 2019 | 78,825,583 | 108.4 | 43,248 |
| 2020 | 93,686,226 | 134.7 | 49,839 |
| 2021 | 111,159,259 | 131.8 | 51,337 |
| 2022 | 93,688,922 | 106.2 | 47,926 |
| 2025 | 159,360,000 | 158.1 | 48,669 |
Market cap is given by the formula, whereMC is the market capitalization,N is the number of common shares outstanding, andP is the market price per common share.[2]
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 thanN becauseN includes shares that are restricted from trading. Thefree-float market cap uses just the floating number of shares in the calculation, generally resulting in a smaller number.
Traditionally, companies were divided into large-cap, mid-cap, andsmall-cap.[9][3] The termsmega-cap andmicro-cap have since come into common use,[10][11] andnano-cap is sometimes heard. Large caps have a slow growth rate as compared to small caps.[2] Different numbers are used by different indexes;[12] there is no official definition of, or full consensus agreement about, the exact cutoff values. The cutoffs may be defined as percentiles rather than innominal dollars. The definitions expressed in nominal dollars need to be adjusted over decades due toinflation,population change, and overall market valuation (for example, $1 billion was a large market cap in 1950, but it is not very large now), and market caps are likely to be different country to country.
FINRA's investor education materials state that the following is a typical (not official) categorization of stocks by market capitalization:[13]
| Category | Market capitalization of individual stock (US$ billions) | |
|---|---|---|
| (FINRA, 2022) | (GDP deflator adjusted to 2023US$)[14] | |
| Mega-cap | ≥ $200 | ≥ $207 |
| Large-cap | $10 – $200 | $10 – $207 |
| Mid-cap | $2 – $10 | $2 – $10 |
| Small-cap | $0.25 – $2 | $0.26 – $2 |
| Micro-cap | < $0.25 | < $0.26 |
TheU.S. Securities and Exchange Commission notes thatnano-cap stocks, in cases when they're separated from micro-caps, are typically defined as stocks with a market capitalization less than $50 million (as of 2013);[15] which is equivalent to less than $64 million in 2023.[14]
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,[16] 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.[17]
