What Is Market Capitalization?
Market capitalization is the total value of a company's shares — the share price multiplied by the number of shares. Here is the formula, the size categories, and why it matters. Educational, not financial or investment advice.
Market capitalization (market cap) is the total value of a company's shares — the share price multiplied by the number of shares outstanding. It is the market's price tag for the whole company, and it is how companies are grouped into large-, mid-, and small-cap. This is educational, not financial or investment advice.
The formula
Market cap = share price × number of shares outstanding. A company with 10 million shares at $50 each has a market cap of $500 million. It changes constantly as the share price moves.
Size categories
| Category | Rough size | Often means |
|---|---|---|
| Large-cap | Biggest companies | More established, steadier |
| Mid-cap | Middle | A mix of growth and stability |
| Small-cap | Smaller companies | More growth potential, more risk |
These bands are rough rules of thumb and the exact cutoffs vary.
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Why it matters
Market cap is a quick read on a company's size, which tends to track how established and how volatile it is — larger companies are usually (not always) steadier than small ones. It is also how index funds decide how much of each company to hold.
Market cap vs share price
A high share price does not mean a big company. A company with a $500 share price but few shares can be smaller than one with a $20 price and billions of shares. Always judge size by market cap, not the sticker price of one share.
Takeaway
Market cap is price times shares — the whole company's value, and a better size gauge than the share price alone. Use it to understand roughly how large and how volatile a company tends to be, remembering the categories are only rough guides.
Educational only — not financial or investment advice.
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Educational content only — not financial advice. Trading involves substantial risk of loss and is not suitable for everyone.