How the Stock Market Works

The stock market for beginners can feel like a wall of tickers and flashing colours. Underneath, it is an organised way for companies to raise money and for investors to buy and sell pieces of those companies from each other. This lesson explains the moving parts in the order you will meet them.

What a share is

A company that wants to raise money can divide its ownership into shares and sell some of them to the public in an initial public offering. After that, the shares change hands between investors on a stock exchange; the company does not receive money from those later trades.

Owning a share gives you three things in most cases:

• A claim on part of the company's profits, which may be paid out as dividends or kept and reinvested in the business.
• A vote at shareholder meetings, in proportion to the shares you hold.
• A share of whatever is left if the company is sold or wound up, after lenders and other creditors are paid. In a bankruptcy this is often nothing.

That link to real profits is the main difference between a share and most crypto tokens, and it is what analysts are trying to value when they study a company.

Where shares trade and when

Shares are listed on regulated exchanges, each with a fixed timetable in local time:

Outside these hours the main order book is closed. If important news arrives overnight, the price can open well above or below the previous close. This gap is one of the biggest practical differences from forex, which trades almost continuously on weekdays.

Brokers and settlement

Individuals buy shares through a licensed broker, which sends the order to the market and usually holds the shares for you in a nominee account. Rules in most major markets require these client assets to be kept separate from the broker's own money, so that they are not lost if the broker fails. In the United States, share trades settle one business day after the trade (T+1), meaning ownership and cash formally change hands the next working day.

Opening and closing auctions

Many exchanges do not simply switch trading on at the opening bell. Instead they collect orders for a few minutes and then run an auction that finds the single price at which the most shares can change hands. A similar auction often sets the closing price. Orders placed before the open are matched in that auction, which is why the first trade of the day can be some distance from the previous close. Beginners who place market orders just before the open should know that the price they get is decided by the auction, not by the last price they saw.

How prices are set

Every exchange runs an order book: a list of buyers with the prices they will pay and sellers with the prices they will accept. A trade happens when a buyer and seller meet. A market order takes the best available price immediately; a limit order names your price and waits.

Over the long run, share prices tend to follow what investors expect a company to earn. Day to day, they also move on interest rates, the mood of the wider market, sector news and simple supply and demand. Nobody can reliably predict those moves, and beginners should be wary of anyone who claims to.

A worked example

Illustrative only: you buy 20 shares at $45.00, spending $900. The company pays a quarterly dividend of $0.30 per share, so you receive 20 × $0.30 = $6 a quarter, or $24 over a year. That is a dividend yield of $24 ÷ $900 = 2.67% on your purchase price. If the share rises to $49.50, your holding is worth $990, a gain of $90 or 10%. If it falls by the same amount, you lose $90. Broker commissions, currency conversion and tax would change these figures.

Indices: the market in one number

An index tracks a basket of shares so you can see how a market is doing at a glance.

• S&P 500: about 500 large US companies, weighted by the market value of shares available to trade.
• Dow Jones Industrial Average: 30 large US companies, weighted by share price rather than company size.
• Nasdaq Composite covers every company listed on Nasdaq; the Nasdaq-100 is the 100 largest non-financial ones.
• FTSE 100 in London, DAX in Germany (40 companies, calculated including dividends), Nikkei 225 in Japan (price-weighted), ASX 200 in Australia, and the Nifty 50 and Sensex in India.

You cannot buy an index directly, but index funds and exchange-traded funds (ETFs) aim to copy one, which spreads your money across many companies in a single purchase.

Ways beginners own shares

• Individual shares: direct ownership of one company, with all the risk concentrated there.
• Funds and ETFs: a basket of shares managed to a stated rule, with an annual charge.
• Share CFDs and spread bets: leveraged contracts on the price, capped at 5:1 for retail clients in the UK and EU. You do not own the share and receive no vote.
• Tax-sheltered accounts: some countries offer them. In the UK, for example, the Individual Savings Account (ISA) allowance is £20,000 for the 2026/27 tax year.

Our page on judging shares covers how people weigh up an individual company, and trading fees explained covers commissions and currency charges.

Risks to understand before buying

• Company risk: a single business can fail, cut its dividend or disappoint for years.
• Market risk: whole markets fall together in recessions and crises, sometimes by a third or more.
• Currency risk: buying US shares with pounds, euros or rupees adds exchange-rate moves on top of the share price.
• Gap risk: overnight news can move the opening price past any stop-loss you set.
• Leverage risk: with CFDs, a 20% fall at 5:1 would wipe out the entire margin.

Words you will hear on day one

• Ticker: the short code that identifies a share on its exchange. The same company can have different tickers on different exchanges.
• Market capitalisation: share price multiplied by the number of shares in issue, a measure of how large the market thinks a company is.
• Volume: how many shares changed hands in a period. Low volume usually means wider spreads and more erratic prices.
• Bull and bear market: loose labels for long periods of rising and falling prices. A fall of 20% from a peak is a common, informal definition of a bear market.
• Share split: dividing each share into several cheaper ones. Your holding is worth the same afterwards; only the number of shares and the price per share change.
• Ex-dividend date: the date from which a buyer no longer receives the next dividend. The price often drops by roughly the dividend amount that morning.

None of these terms tells you whether to buy anything. They simply help you read a quote page or a company announcement without guessing. The full list is in the glossary.

The stock market for beginners: a sensible order of learning

1. Understand what a share and an index are (this page).
2. Learn the costs: commission, spread, currency conversion and fund charges.
3. Check that any broker is authorised; see how to choose a broker.
4. Decide what role shares play in your wider finances, not just which one to buy.

Sources

• US Securities and Exchange Commission, T+1 settlement cycle
• Exchange websites for regular trading hours
• UK HM Revenue and Customs, ISA allowances