What Is a Stock?
A stock is a share of ownership in a company. Here's what that gets you, how you make money from it, and how you buy one.
By Pavel Penev, MScFounder, TradeWize · 10+ years trading the marketsA stock is a share of ownership in a company.
Cut a company into a million equal pieces and hand them out. Own one of those pieces and you own a millionth of the business. That piece is a stock.
That's the whole definition. The ticker, the price on the screen, the dividend, the annual report that turns up in your inbox — all of it hangs off that one idea.
The short answer
You own a piece of the business, so its profits and whatever it's worth are partly yours. Two things can pay you: cash from the company, or selling your share for more than you paid. You buy through a broker, and you can buy a fraction of a share — a $1,000 stake in Apple is about one 4.5-billionth of it.
A stock is a share of a company
Every company is owned by somebody. Split a company's ownership into shares and the people holding those shares are the owners. How much you own depends on how many shares you hold.
Take that literally, because it's literal. If a company has issued 1,000 shares and you hold 100 of them, you own 10% of the company. Not 10% of its office, and not 10% of its delivery vans. 10% of the company itself — everything it owns, everything it earns, and everything it owes.
That's as true of a bakery with two owners as it is of a company millions of people own. The only thing that changes is how many pieces it was cut into.
Your share of a company is a fraction of the whole, whether the whole is a hundred pieces or billions of them. The grid is the right idea at the wrong scale.
Real companies are cut into a lot of pieces. Apple is split into 14.6 billion shares, so a $1,000 stake buys about one 4.5-billionth of the company. That's not a typo.
Every company figure in this article is from August 2026. Share prices change every day, so treat those as a snapshot. The number of shares a company has barely moves, and that's the number the ownership maths runs on.
One thing to clear up before we go further, because it's where beginners get stuck first. Five words cover this same handful of ideas, and everything you read swaps between them without telling you.
| Word | What it means |
|---|---|
| Stock | Ownership in a company. "I own some Apple stock." |
| Share | One unit of that ownership. Stock is the thing; shares are how you count it. |
| Equity | The formal word for ownership. When people say "equities" they mean stocks. |
| Security | The category above all of them. Anything tradable — stocks, bonds, funds. A stock is one kind of security. |
| Ticker | The short code a stock trades under. Apple is AAPL, Coca-Cola is KO. |
Stock and share are the same thing. Nobody will correct you for using either.
Why companies sell shares
A company needs money it doesn't have. It wants to build a second factory, hire two hundred people, or open in a country it isn't in yet, and all of that costs more than the business is currently making.
There are two ways to get that money. Borrow it, or sell part of the company.
Borrowing means paying it back, with interest, on a schedule, whether or not the plan works. Selling part of the company means handing over a permanent slice of everything it earns from here on, and never repaying a cent of it. Founders take the second deal all the time, because cash that never has to be repaid is worth giving up a slice for.
You're on the other side of that trade. Your money goes in, and what comes back is a piece of the business and everything that piece is entitled to.
The first time a company sells shares to the public it's called an IPO, and that's the day the money reaches the company. After it, those shares change hands between investors on an exchange and the company gets none of that money. It can come back later and sell more shares, but it isn't paid a penny by the daily trading in the ones it already sold. Our piece on the primary and secondary markets follows exactly where the money goes.
What you get for owning one
Three things come with a share.
- A claim on the profits. When the company makes money, your slice of that money is yours. Some of it may be paid out to you in cash. The rest stays inside the business, and you own part of that too.
- A claim on what the business is worth. If the company is worth more in ten years than it is today, your shares are worth more too. No money reaches you when that happens. You turn it into money by selling.
- A vote. Shareholders elect the company's board, which is the small group that hires the chief executive and signs off the biggest decisions. The size of your vote follows the size of your holding.
One share, one vote is the usual arrangement. Some companies do it differently and issue more than one class of share, where one class carries more votes than the other or none at all, so check rather than assume.
Be realistic about that vote, though. A $1,000 stake in Apple buys 3.233 shares out of 14.6 billion. Your vote is that size, so you're not going to swing anything at the annual meeting.
There's a second number, and it's the one that makes owning a share mean something. That same slice is $24.81 of the profit Apple made last year. The company earned it on your behalf, because you own that piece of it.
So your slice of Apple is almost nothing, and your slice of Apple's profit is $24.81. Both are true at once, and that's what owning a share is.
Pick an amount and a company. Every figure below is what that stake really owns.
Your slice of Apple is about one 4.5‑billionth of the company. That slice earned $24.81 of profit last year. Both are true at once. Holding them together is what owning a share means.
Each share is also one vote at Apple’s annual meeting. That’s about 14.6 billion votes in total, so a stake this size won’t swing anything.
Figures are from August 2026. Share prices change every day. The number of shares a company has barely changes at all.
Where the share price comes from
Nobody at the company decides the share price.
At any moment some people who own the stock are willing to sell it, and some people who don't own it are willing to buy. A trade happens when a buyer and a seller land on the same number. That number is the price, and the next trade sets a new one.
So the share price is just the latest number two strangers agreed on, updated all day. It moves when their opinion moves — a profit report better than expected, a product nobody wanted, a rate rise, a rumour.
The company gets nothing when the price goes up and loses nothing when it falls. That money moves between investors. It doesn't move between you and the company at all.
The price on its own also tells you nothing about how big a company is. A $309.35 share isn't expensive and a $91.10 share isn't cheap. All the price says is how many pieces that company was cut into. Multiply the share price by the number of shares and you get the market cap, which is the number that answers "how big". Our piece on market cap goes through it properly.
Learn it by doing
Reading about it is one thing — it clicks when you do it. Practise this hands-on in a free, interactive lesson (Stage 4: Stocks, Bonds, Cash & Alternatives).
Try the free lesson →The two ways a stock makes you money
There are exactly two. The company pays you cash, or you sell your share for more than you paid. Everything you'll ever read about stock returns is one of those, or the two added together.
The first one is a dividend. A company that's making money can hand some of it to shareholders, usually every quarter, as a payment for each share you hold. Coca-Cola pays $2.12 a share a year. Apple pays $1.08, so a $1,000 stake in Apple would pay you $3.49 over a year. Your broker credits it to your account and you don't have to do anything.
It's a slice of the profit, not all of it. Apple earned $7.67 per share last year. It pays out $1.08 of that, which is 14%. The other $6.59 a share stays in the business, and you own your slice of that too.
Plenty of companies pay nothing at all. Amazon has never paid a dividend and puts the profit back into the business instead. That isn't a company failing you. It's a different decision about where the profit goes, and you should expect to meet both kinds.
The second way is selling for more than you paid. Buy a share at $40, watch it reach $52, and you're up $12. That's called a capital gain. Nobody sends it to you. It sits on your account screen as a number until you sell, and it can fall back down before you do.
The slate block is money you already had. Only the two bands above it are return, and the difference between them matters: the cash was yours the day it landed, and the gain is only real once you sell.
Add the two together and you have your total return. That's the number that matters. It's why a stock paying no dividend can still be the better investment, and why a fat dividend on a sinking share price can still leave you behind.
How each of those two is taxed depends on where you live, and most countries tax them differently from one another. Spend ten minutes on your country's rules before you buy, not after. Our dividend piece covers how the payment itself works, including the dates that decide whether you're the one who gets paid.
What can go wrong
Everything above runs the other way too. Three things in particular.
- The price falls. You still own the same slice of the same company, and other people have decided it's worth less than they used to think. On your screen that's a loss, and it turns into a real one the moment you sell.
- The dividend gets cut. A dividend is a decision, not a contract. A company under pressure can reduce it or stop it altogether at the next board meeting. The share price usually falls the same day, so you tend to lose both at once.
- The company fails. When a company is wound up, everyone it owes a fixed amount to is paid out of what's left. You own the company rather than lending to it, so you're paid last, out of whatever survives that.
That last one is where a share differs from a loan, and it's the part worth understanding before you buy one.
The money usually runs out partway down. Being an owner rather than a lender is what puts you at the bottom of this queue, and it's the same thing that hands you the upside when the company does well.
The floor under a stock
A stock can go to zero, and stocks do. That's the full downside of owning one, and it's also the limit of it. Buy shares with your own money and the most you can lose is the money you put in. Nobody can come back and ask you for more.
That's the argument for not putting everything into one company.
How you actually buy one
Almost always, you buy through a broker, which is a licensed firm that places the order for you. A few big companies will sell you shares directly instead, but that's the exception, and a broker is where everyone starts. Four steps.
- Open an account. You'll need ID, an address and a way to move money in, and it usually takes minutes online. Account types vary enormously by country, and so does whether any of them shelter your gains from tax. Look up what's on offer where you live before you open the first account you see advertised.
- Find the ticker. Every listed company trades under a short code — Apple is AAPL, Coca-Cola is KO, Amazon is AMZN. Large companies are often listed on several exchanges under different codes and in different currencies, so check you've got the one you meant.
- Place an order. A market order buys right now, at whatever the price happens to be. A limit order names the most you're willing to pay and waits for somebody to sell at that price.
- Let it settle. The trade is agreed the instant it fills, and the paperwork behind it finishes a day or two later. You'll see the shares in your account either way.
Our piece on order types explains which of those two to use when, and why the safe-sounding one isn't always the safer one.
Selling runs the same way backwards. Pick the holding, choose a market or a limit order, and the shares leave your account. A listed share can be sold on any day the market's open, which is the main practical difference between owning a stock and owning something like a flat.
Two things worth knowing before you start. The first: you don't need a whole share. Apple costs $309.35 a share, and $100 buys 0.323 of one. Most large brokers sell fractions like that, and a fraction earns the same proportional dividend and the same proportional gain as a whole share. Not every broker offers it, so check before you fund an account with a small amount.
The second: zero commission doesn't mean free. Plenty of brokers charge nothing to trade a stock and still make money three other ways. There's the gap between the price you buy at and the price you sell at. There's a charge for converting your currency when you buy a foreign stock. And there's sometimes a flat platform or custody fee for holding the account at all. Our broker comparison puts those side by side.
How most people own stocks without picking any
Everything above is about buying one company. Most people who own stocks have never chosen one in their lives.
They own an index fund or an ETF instead. That's a single fund that holds every company on a list. An S&P 500 fund holds the 500 largest listed US companies, and a global fund holds thousands of companies across dozens of countries. Buy one share of the fund and you own a sliver of everything inside it, in one transaction, for a fee that's usually well under a quarter of a percent a year.
The reason it's the standard advice is simple. Pick one company and that company's fate is your fate. Hold five hundred and one of them going to zero costs you a slice, not the lot.
How big a slice depends on how big the company is. An index fund holds more of the giants than of the minnows. So the largest few are worth several percent each, and most of the rest are worth a fraction of a percent apiece. You give up the chance of picking the one that goes up tenfold. You also give up the chance of picking the one that goes to nothing. Most people are happy with that trade.
It's still stocks, though. A fund full of stocks falls when stocks fall, and in a bad year it falls a long way. Spreading your money across companies protects you from any one company. It doesn't take you out of the stock market. Our piece on index funds covers how they work, and the index-fund-versus-ETF piece covers which of the two to buy.
Is a stock the same as a share?
Yes. People use both words for the same thing. "Stock" usually describes the type of investment and "shares" the units you own, so you own 10 shares of a stock. Nobody will correct you either way, and "equities" is the same thing again in a more formal voice.
Can a stock go to zero?
Yes. If the company fails, its lenders and everyone else it owes a fixed amount to are paid first, and there's usually nothing left by the time the queue reaches shareholders. You can lose everything you put into a single stock. You can't lose more than that, as long as you bought the shares with your own money rather than with borrowed money.
How much money do I need to start?
Less than you'd think. Most large brokers have no minimum deposit and sell fractional shares, so $100 buys 0.323 of a $309.35 Apple share, and that fraction pays the same proportional dividend a whole one does. The real floors aren't the share price. One is fees, because a flat commission per trade eats a big slice of a small purchase. The other is diversification, because $100 in one company is still one company.
How do I sell, and how fast can I get my money back?
You sell through your broker the same way you bought, and a listed share can be sold on any day the market's open. The sale itself takes seconds. The cash reaches your brokerage account a day or two later, once the trade settles, and moving it on to your bank takes another day or so. Call it under a week in normal conditions. The catch isn't the speed, it's the price. You sell at whatever the market is paying that day, and that can be less than you paid.
What happens to my shares if my broker goes bust?
Your shares aren't the broker's property, and that's the part that matters. A regulated broker has to keep client investments separate from its own money, so its creditors can't be paid with them. The usual outcome is that your holdings get moved to another firm. Most countries also run an investor compensation scheme that covers a capped amount if something really is missing. The cap and the rules vary a lot, so look up the scheme where you live rather than assuming. None of it covers your shares simply falling in value.
What happens if the company I own gets bought?
It's handled for you. When another company buys the one you hold shares in, the deal spells out what shareholders get. Usually that's a fixed amount of cash per share. Sometimes it's shares in the buyer instead, and sometimes it's both. If it's cash, your shares disappear and the money lands in your account. If it's shares, you end up owning a piece of the buyer. Your broker will write to you, and if there's a shareholder vote you'll be asked to cast yours.
One stock is where it starts, not where it ends
Knowing what a share is gets you to the first purchase. What you own alongside it decides how the next thirty years go. How much of your money sits in stocks, what the rest of it does, and what a bad year does to the whole thing. That's a different skill from picking a company, and it's the one doing the heavy lifting.