Market capitalization is the total market value of a company's outstanding shares, calculated by multiplying the current share price by the total number of shares outstanding.
Market capitalization, often shortened to market cap, is the simplest measure of a company's size in the eyes of the equity market. The formula is straightforward: share price multiplied by shares outstanding. A company with 50 million shares trading at $10 has a market capitalization of $500 million.
Market cap is useful because it standardizes size across companies regardless of share price. A stock trading at $2 is not necessarily smaller than one trading at $80; what matters is the price multiplied by the share count. This is why investors compare companies by market cap rather than by share price alone, and why the market groups companies into large-cap, mid-cap, small-cap, and micro-cap bands based on this figure.
It is worth distinguishing market capitalization from a few related terms. Enterprise value adjusts market cap for a company's debt and cash and is often used to compare businesses with different capital structures. Float-adjusted market cap counts only the shares available for public trading, excluding closely held blocks. And market cap reflects the market's current view of a company's value, which can differ from its book value or its intrinsic worth.
Because it moves with the share price, market capitalization changes constantly. It is a snapshot of what the market currently thinks a company is worth, not a fixed or fundamental measure. For smaller companies, where visibility is limited, that market view can lag the underlying business, which is part of what makes the small and micro-cap category interesting to specialist investors.