JUN · ISSUE 25 · June 13, 2026
CONCEPTWhat 'worth two trillion' really means
Market cap measures the size of a company on the market. And almost no one reads it right.
FORMULA
Price × Shares
not the price alone
IT IS NOT
the cash
nor money in the bank
IT MEASURES
size
what the whole company is worth
THE IDEA
Price × Number of shares
= market capitalization
Market cap is what it would cost to buy the entire company at its current share price. You calculate it by multiplying the price by the number of shares outstanding. That is why a whole company can be worth trillions even when each share costs only a few dollars: what matters is how many shares exist.
THE MATH
EXAMPLESame price, very different sizes
$10 × 10bn
= $100bn market cap
A cheap share multiplied by a huge share count can make a giant company. A pricey share with few shares, a small one. Price alone misleads.
The price of one share tells you nothing about the size of the company. What matters is how many shares you multiply it by.
- BILLION
- — A billion is 1,000,000,000. The usual scale for large companies.
- SHARE PRICE
- — What it costs to buy one share, not the whole company.
PRINCIPLE
RULEPrice is not size
“A share price tells you the cost of one slice. Market cap tells you the value of the whole pie. They are different questions.”
Confusing a share's price with the company's value is the most common beginner mistake.
- COMPANY VALUE
- — What it would cost to buy the whole company, not a single share.
- SLICE
- — A metaphor for a share: a portion of the whole company.
THE SPLIT
ILLUSTRATIONWhen price drops but value stays the same
After a 2-for-1 split, each share costs half, but there are twice as many. The company is worth exactly the same: price fell, size did not.
Vertical axis: a single share's price. In a split, the price is cut, but market cap holds: more shares, each one cheaper.
- SPLIT
- — A stock split: the company divides each share into several, lowering its price.
- MARKET CAP
- — Unchanged by a split: more shares at a lower price, same total.
THREE MYTHS
AVOID THE ERRORWhat market cap is NOT
1. NOT THE SHARE PRICE
An $800 share can be a smaller company than one whose share is $30. It depends on how many shares exist.
2. NOT THE COMPANY'S CASH
Being worth two trillion on the market does not mean it holds that money. It is what the market pays for it, not what it keeps.
3. NOT EVERY SHARE COUNTS EQUALLY
Free float is the shares free to trade. If founders hold the majority, the company weighs less in the indices.
4. A HIGH PRICE IS NOT 'EXPENSIVE'
Cheap or expensive is measured with multiples, not the price tag. A $5 share can be wildly overpriced.
Three common mix-ups that lead people to buy or dismiss a stock for the wrong reason.
- FREE FLOAT
- — The portion of shares available to buy and sell on the market.
- MULTIPLE
- — The ratio of price to a business metric, to judge cheap versus expensive.
BY SIZE
CATEGORIESLarge, mid, and small cap
A large cap can be worth a hundred times a small cap. Knowing which tier you invest in completely changes your risk.
Companies are grouped by their size on the market, and each category carries a different risk and upside profile.
- LARGE CAP
- — A large-capitalization company, usually the most stable.
- SMALL CAP
- — A small-capitalization company, more volatile with more upside.
ILLUSTRATIVE
PRICE MISLEADSWhy price does not reveal size
| CO. A | ~$50 | ▲ 10bn shrs | Illustrative: cap ~$500bn, a giant. |
| CO. B | ~$50 | ▼ 200m shrs | Illustrative: cap ~$10bn, far smaller. |
| CO. C | ~$800 | ▼ 50m shrs | Illustrative: high price, small company ~$40bn. |
| CO. D | ~$8 | ▲ 300bn shrs | Illustrative: low price, huge company ~$2.4tn. |
Rounded, illustrative figures to see the idea: two shares at the same price can be companies of opposite size.
- ILLUSTRATIVE
- — Invented figures to explain the concept, not real market data.
- TRILLION
- — A thousand billion: 1,000,000,000,000.
CLOSE
FOLLOW USPrice misleads, market cap informs
Next time you hear 'this company is worth X', remember: it is price times shares, not the price tag nor the money in the bank.
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- MARKET CAP
- — A company's size on the market: price times number of shares.
- MULTIPLE
- — What actually tells you whether a share is cheap or expensive.