Market capitalization ("market cap") is the total market value of a company's outstanding shares — share price multiplied by shares outstanding — the standard way to size a company and bucket it as large-, mid-, or small-cap.
Large-cap stocks (roughly $10B+) tend to be more established, more liquid, and less volatile than small-caps ($300M-$2B), which can move faster in both directions on lower trading volume. The S&P 500 is itself a large-cap index — its constituents are, by construction, some of the largest publicly traded U.S. companies by market cap.
Live example: AAPL currently trades around $333.74 per share. Multiplying a share price by the company's total shares outstanding gives its market cap — Quantustik doesn't cache the live shares-outstanding figure on this page, so see the full AAPL forecast or a financial data provider for AAPL's current market cap.
A high share price does not imply a large company, and a low share price does not imply a small one — a $20 stock with 10 billion shares outstanding is a $200B company, larger than a $500 stock with 50 million shares outstanding ($25B). Compare companies by market cap, not by the raw share price, which is mostly an artifact of a company's chosen share count (split history).
Roughly: large-cap is $10B+, mid-cap is $2B-$10B, and small-cap is $300M-$2B — exact thresholds vary by index provider and shift over time as the overall market grows.
Generally lower-volatility, not necessarily safer in every sense — large companies can still carry heavy debt, face disruption, or see their market cap fall sharply on bad news. Size correlates with stability on average, it does not guarantee it for any individual company.
Market cap only values the equity (shares). Enterprise value adds debt and subtracts cash, giving a fuller picture of what it would cost to acquire the whole company outright.
AAPL analysis shows this metric in context, or browse all S&P 500 tickers.
Educational research only — not investment advice.