Market Capitalization
"Market capitalization (or \"market cap\") is the total market value of a company's shares. It is calculated as the stock price multiplied by the total number…"
Market capitalization (or "market cap") is the total market value of a company's shares. It is calculated as the stock price multiplied by the total number of outstanding shares.
Formula
Market Cap = Stock Price × Shares Outstanding
If Apple is trading at $250 per share and has 15 billion shares outstanding, its market cap is $250 × 15B = $3.75 trillion.
Market Cap Tiers
- Mega-cap: Above $200 billion (Apple, Microsoft, Nvidia)
- Large-cap: $10B–$200B (most Fortune 500 companies)
- Mid-cap: $2B–$10B (established companies with growth potential)
- Small-cap: $300M–$2B (smaller, riskier companies)
- Micro-cap: Below $300M (very small, illiquid)
What It Tells You
Market cap is a quick measure of company size and investor confidence. A $100B market cap is generally larger and more stable than a $1B market cap.
However, market cap can be misleading. A micro-cap stock might have explosive growth potential, while a mega-cap might be mature and slow. Always look beyond size.
Key Takeaway
Market cap is useful for categorizing companies by size and understanding liquidity. However, it should not be the only factor in investment decisions. A large market cap does not guarantee safety; a small market cap does not guarantee growth.