Market Capitalization
Quick Answer
The total market value of a company's outstanding shares, calculated by multiplying share price by shares outstanding.
Calculating Market Cap
Formula: Market Cap = Current Share Price × Total Shares Outstanding
Example: If a company has 1 billion shares and trades at $50/share: Market Cap = 1B × $50 = $50 billion
Market cap changes constantly as the stock price fluctuates.
Size Categories
Large-Cap ($10B+) Established, stable companies like Apple, Microsoft. Lower risk, lower growth potential.
Mid-Cap ($2B - $10B) Growing companies with more upside than large-caps but still relatively stable.
Small-Cap ($300M - $2B) Higher growth potential but more volatile and risky.
Micro-Cap (<$300M) Highest risk, lowest liquidity, potential for big gains or losses.
Using Market Cap
Comparing Companies Market cap shows relative size better than stock price. A $10 stock can represent a larger company than a $500 stock.
Index Weighting Most major indices are market-cap weighted, meaning larger companies have more influence on the index.
Valuation Context Metrics like P/E ratio are more meaningful when compared within the same market cap category.