What is a share, really?
Not a lottery ticket, but a small piece of ownership in a real business.
Ownership, not a bet
When you buy a share, you are not betting that a number will go up. You are buying a small piece of a business: its factories, its brands, its contracts, and your claim on a slice of its future profits. If a company has a hundred million shares and you own a hundred of them, one millionth of that company belongs to you.
That piece is small, but it is real. You have the right to vote at the annual meeting. If the company pays dividends, you get your share. If it gets bought, you get your share of the price. Nobody can take that piece away from you — only you can, by selling it.
This is why the first question about any share is not 'will it go up?' but 'is this a good business?'. Over time, the second answers the first on its own. The first without the second is just a bet.
Where the price comes from
A share's price is not set by the company. It is set by the people buying and selling that share today, and they buy and sell based on what they think the company will earn tomorrow.
That is how a company can announce record profits and watch its share fall. If the market expected even bigger profits, the good news was already baked into the price, and reality came in below expectations. The price moves on the gap between what happened and what was expected to happen.
This is the most counterintuitive part of markets, and it is worth remembering: prices do not react to news, they react to surprises.
Why it exists at all
Companies sell shares because they need money now. A company that wants to build a factory can borrow from a bank, or it can sell people pieces of itself. A loan has to be repaid with interest. Shares never have to be repaid.
In exchange, shareholders get a piece of the ownership and of the future profits. It is a trade: the company gets capital without debt, and the investor gets a share of whatever that capital builds.
Seen this way, the stock market is not a casino built on top of the economy. It is the mechanism through which people's savings reach the businesses that need them.
Key terms in this lesson
- Share
- A unit of ownership in a company, giving you a claim on a slice of its profits.
- Shareholder
- Anyone who owns at least one share of a company.
- Market capitalisation
- A share's price multiplied by the number of shares — the market's valuation of the whole company.
Quick check
A company announces the highest profits in its history and the share falls 5%. What is the most likely explanation?
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