A $10 stock can represent a bigger company than a $100 stock. The missing piece is how many shares exist.
The one-line explanation
Market capitalization, usually shortened to market cap, is a company’s outstanding shares multiplied by its current share price. It describes the market value of its equity at that moment. Investor.gov explains the calculation.
Two imaginary companies, one useful comparison
Imagine Biscuit Co. trades at $10 a share and has 100 million shares outstanding. Its market cap is $1 billion. Leash Labs trades at $100 a share but has only 1 million shares outstanding. Its market cap is $100 million.
Biscuit Co.’s share price is lower, yet its market cap is ten times larger. These companies and figures are invented to illustrate the math.
Try the math
Change the imaginary share price and share count below. This calculator uses your numbers; it does not fetch live market data.
How to use it when reading a headline
When a headline calls a company “large,” ask what measure it means. A company can be large by market value, sales, headcount or assets. Those measures answer different questions.
Market cap also moves as the share price moves. If a company issues or repurchases shares, the share count can change too. It helps to check that the price and share count refer to the same company and a compatible date.
What market cap leaves out
It does not tell you whether the business is profitable, whether its debt is manageable or whether its shares are attractively priced. A higher share price is not, by itself, proof of a better business. A lower share price is not a discount label.
Market cap is a useful starting point for understanding company size. It is one number in the story, not the whole research process.