What Is Market Cap, and How Is It Different From Enterprise Value?
The short answer. Market capitalisation is the share price multiplied by the number of shares outstanding — the market's price for the whole equity of a company. It is not what the company is worth to an acquirer, because it ignores debt and cash. For that you want enterprise value: market cap plus net debt.
Market cap versus enterprise value
| Market capitalisation | Enterprise value | |
|---|---|---|
| Formula | Price x shares outstanding | Market cap + debt − cash |
| Answers | What is the equity priced at? | What would the whole business cost? |
| Use it for | Size, index weighting, P/E | Comparing companies with different debt loads |
Two companies can have identical market caps and completely different enterprise values. One carries £5bn of net debt; the other holds £5bn of net cash. Judging them on P/E alone treats them as equivalent, which they emphatically are not — the indebted one has a prior claim on its cash flows that the equity holder ranks behind.
What are the size bands?
| Band | Typical range | Character |
|---|---|---|
| Mega cap | Over $200bn | Index-defining, heavily researched |
| Large cap | $10bn to $200bn | Established, widely covered |
| Mid cap | $2bn to $10bn | Room to grow, thinner coverage |
| Small cap | $300m to $2bn | Volatile, often under-researched |
| Micro cap | Under $300m | Illiquid, frequently uninvestable in size |
The bands are conventions, not definitions, and they shift with the market.
Why does size matter for a private investor?
Mostly through coverage and liquidity. A mega cap is followed by fifty analysts, so genuine informational edge is close to impossible — you are competing to be right about interpretation, not facts. A small cap may be followed by nobody, which is where the edge lives and also where the risk lives: wider spreads, less disclosure, and a real chance you cannot sell when you want to.
Note the effect on institutional data too. 13F filings only capture managers over $100m, and those managers cannot take a meaningful position in a very small company without owning too much of it. A small cap showing zero institutional holders is describing the filing rules more than the business.
What this cannot tell you
Market cap is a price, not a valuation. It tells you what the equity currently costs, and nothing at all about whether that is a sensible thing to pay.
Educational information, not financial advice. Every figure on this page is read from the source filings when the page loads rather than written into the article, so what you are reading is today's data and not a snapshot of the day it was published.
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