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A beginner summary of a flagship U.S. equity index.
This page is for education only and not investment advice.
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Glossary
Glossary from article
Market capitalization, commonly called market cap, is the total market value of a company's outstanding shares or a cryptocurrency's total circulating supply. It represents how the market collectively values an asset and serves as one of the most widely used metrics for comparing the relative size of different investments.
The formula for market cap is straightforward:
Market Cap = Current Price x Total Circulating Units
For stocks: Share price multiplied by total shares outstanding For cryptocurrencies: Token price multiplied by circulating supply
For example:
Market cap provides essential information for investors:
Price vs. market cap
A common beginner mistake is thinking a $500 stock is "more expensive" than a $50 stock. Market cap reveals the truth. A $500 stock with 10 million shares outstanding (market cap $5 billion) represents a smaller company than a $50 stock with 500 million shares outstanding (market cap $25 billion). Always compare market caps, not share prices.
Investments are typically classified by market cap size:
| Category | Typical Range | Characteristics |
|---|---|---|
| Mega-cap | $200+ billion | Global giants, very stable, household names |
| Large-cap | $10-200 billion | Established companies, lower volatility |
| Mid-cap | $2-10 billion | Growth potential with moderate risk |
| Small-cap | $300 million-2 billion | Higher growth potential, higher volatility |
| Micro-cap | Under $300 million | Very high risk, limited analyst coverage |
In cryptocurrency markets:
Market cap reflects only equity value, not total company value. For a complete picture:
Enterprise Value = Market Cap + Debt - Cash
A company with $10 billion market cap, $5 billion in debt, and $1 billion in cash has an enterprise value of $14 billion. This matters because when acquiring a company, you assume its debts along with its assets.
While useful, market cap has important limitations:
The fully diluted trap
Be cautious of "fully diluted market cap" in cryptocurrencies, which includes all tokens that could eventually exist. A project might have a $1 billion circulating market cap but $50 billion fully diluted. If all those tokens enter circulation, existing holders face massive dilution.
Consider these practical applications:
Real-world examples help illustrate market cap: