What you actually buy when you buy a share

A share is a slice of a company

A share is a piece of ownership in a business. Not a bet on a business, not a token that tracks a business — a piece of it. If a company has issued a hundred million shares and you hold a hundred, you own one millionth of everything it owns and one millionth of everything it earns.

That sounds abstract until you notice what comes with it: the right to a share of the profits when the company decides to hand them out, and, on most shares, a vote at the shareholders’ meeting. You will not swing an election with a hundred shares. You are still, legally, an owner rather than a customer.

Companies whose shares trade on an exchange are called issuers, and being listed has a price: audited results published on a fixed calendar, for anyone to read. That obligation is exactly what makes it possible for a stranger to own a piece of a business they will never visit.

The value comes from future profits

Here is the sentence that makes everything else click. A share is a claim on the profits a company will make in the future.

Not the profits it made last year — those are already spent, distributed, or sitting on the balance sheet, and the price took them into account long ago. What you are buying is a slice of everything the business earns from today until it stops existing, discounted back to what that stream is worth right now.

That single idea explains a lot of things that look bizarre from the outside. It explains how a company that has never made a peso of profit can be worth a fortune, if enough people believe the profits are coming. It explains why a company with excellent current results can fall on the day it says next year will be softer. And it explains why interest rates move share prices at all: when safe bonds pay more, future money is worth less today, so the same expected profits are worth a lower price.

Why the price moves

Because the price is a running vote on those future profits, and the voters change their minds. Four things move it more than anything else:

• News about the profits themselves. A big contract, a new product, a factory that burns down.
• News about the world. Interest rates, recessions, wars, tariffs. None of it is about the company, all of it changes what its profits will be worth.
• The gap against expectations. A company can report its best quarter ever and drop, because the market had priced in something better. Prices move on surprises, not on levels.
• Mood. Fear and enthusiasm are real forces on a short timescale, and they explain most of what happens in any given week.

The first three are signal. The fourth is noise that looks exactly like signal while it is happening, which is why volatility punishes people who watch the screen daily and barely touches people who do not.

Worth doing once: open the S&P 500 card in Markets, set the range to five years, and then set it to one day. Same asset, two completely different emotional experiences. Only one of them is telling you anything.

Price is not size

A share at 500 pesos is not “expensive” and one at 50 pesos is not “cheap”. The price of one share depends entirely on how many shares the company chose to cut itself into. What measures the company is its market capitalization — price per share times number of shares — and that is the number to compare when you want to know whether you are looking at a giant or a startup.

Dividends: getting paid without selling

Some companies hand part of their profits to shareholders in cash, usually every three months. That is a dividend. Nobody is obliged to pay one: a company that is growing fast normally reinvests everything instead, and that is not stinginess, it is a bet that a peso inside the business grows faster than a peso in your account.

So a share can pay you in two ways: the dividend, and the price if you eventually sell higher. Mature, boring companies tend to lean on the first. Fast-growing ones lean on the second. Neither is better; they are different deals, and you should know which one you signed up for.

Why a share is not a lottery ticket

A lottery ticket has no underlying asset. Nothing about it works, produces, hires or sells; it is a number that either matches or doesn’t, and its expected value is negative by design. A share sits on top of a business with warehouses, employees, customers and contracts, which is why the whole market has tended to be worth more over decades rather than expiring worthless.

The trap is that a single share can absolutely behave like a lottery ticket over a short horizon, and companies do go to zero. That is not an argument against shares — it is the argument for spreading your money across many of them, which is what an index like the S&P 500 does automatically, and for buying through a regulated brokerage rather than whoever posted the chart.

The short version

A share is a piece of a company and a claim on its future profits. The price moves because expectations about those profits move, and because people get scared and excited on the way. Dividends pay you without selling; the price pays you if you do. And the reason none of this is gambling is that there is a real business underneath — as long as you own enough of them that no single one can decide your outcome.