A high share price does not make a stock "expensive," and a low one does not make it "cheap." On its own, a share price tells you almost nothing about a company's size or value. The number that actually measures size is market capitalization.
Key takeaways
Market cap = share price × shares outstanding
A share price is just a company's total equity value divided by however many shares happen to exist. Because the share count is a choice the company makes, two businesses worth exactly the same can trade at completely different prices. Berkshire Hathaway is the live version: Class A shares trade at a much higher price than Class B shares, yet they are slices of the same company. MarketCapLens combines the classes and lists Berkshire once. A cheaper Class B quote is not a smaller Berkshire.
The same idea in round numbers:
| Company | Share price | Shares outstanding | Market cap |
|---|---|---|---|
| HighPrice Co. | $500 | 2 billion | $1 trillion |
| ManyShares Co. | $50 | 20 billion | $1 trillion |
ManyShares Co.'s shares cost a tenth of HighPrice Co.'s, yet the two businesses are worth the same. The "$50 stock" is not smaller, or a bargain, just because the ticket price is lower. (Broker apps still lead with share price because that's what you click to trade — size is a separate column.)
A stock split is the cleanest example. Imagine a company at $1,000 a share with 1 billion shares ($1 trillion market cap). After a 10-for-1 split it trades near $100 with 10 billion shares — still $1 trillion. Nothing about the business changed; the company is simply sliced into more pieces.
Amazon did this in public: its 20-for-1 split in June 2022 multiplied the share count and divided the price. The company was not 95% smaller the next morning. The figure on the company page is today's market cap, not a souvenir of the old share price.
The same identity in a table, using round numbers (not a live quote):
| Price | Shares | Market cap | |
|---|---|---|---|
| Before a 10-for-1 split | $1,000 | 1 billion | $1 trillion |
| After | $100 | 10 billion | $1 trillion |
Price and share count both moved. Size did not. That is why a split-adjusted chart is for comparing prices over time, not for reading a company as cheaper after the split.
The reverse trap is assuming a very low price signals a bargain. Many low-priced stocks belong to small companies, often micro-caps, that can be thinly traded and volatile. The low price usually reflects the small size, not a discount.
Share price is a slice size. Market cap is the whole pie. Use market cap when you want to know how large a company is.
Neither number is a quality score. Market cap still ignores debt, cash, profits, and growth — see what market cap leaves out. Price still matters for trading mechanics (how many shares you get for a dollar), just not for ranking size.
When you size up companies, look at market cap rather than the price of a single share. That is why the MarketCapLens ranking is ordered by market cap: it puts every company on the same footing no matter how many shares each has chosen to issue. For the mechanics of the number itself, start with What Is Market Capitalization?
For general education only. Nothing here is investment advice.
Formulas and worked examples are MarketCapLens's. See who checks the numbers.