How the Stock Market Works

The stock market for beginners is easiest to understand as a marketplace for slices of companies. When a company lists its shares on an exchange, investors can buy and sell those slices among themselves every trading day, and the price at any moment reflects what they collectively think the company's future profits are worth. This guide explains how that marketplace works, from the order you place to the account that holds your shares.

What owning a share means

A share is a unit of ownership. If a company has 100 million shares and you own 1,000, you own one hundred-thousandth of it. That gives you a claim on its profits, which the company may pay out as dividends or reinvest, and, for ordinary shares, a vote at shareholder meetings. If the company is bought, shareholders are paid; if it collapses, shareholders are the last in line and often get nothing.

Here lies the main contrast with most crypto tokens. A company produces earnings you can measure, and analysts compare the share price with those earnings. A token may have a use inside a network, but it rarely carries a legal claim on anyone's profits.

Exchanges, brokers and trading hours

Shares are listed on exchanges such as the New York Stock Exchange and Nasdaq, the London Stock Exchange, Germany's Xetra, the Tokyo Stock Exchange or India's NSE and BSE. Each runs a regular session on weekdays: 09:30 to 16:00 in New York, 08:00 to 16:30 in London, and 09:15 to 15:30 in India, for example. Some venues offer extended hours, where trading is thinner and prices can jump.

You cannot buy directly from an exchange. You open an account with a licensed broker, which routes your order and usually holds your shares for you in a nominee account, legally separate from the broker's own assets. In the US, trades settle one business day after the trade date (T+1), which is when the shares and the cash formally change hands.

How an order gets filled

Every listed share has a bid and an ask. The main order types are:

• Market order: trades straight away against whatever is on offer. Quick, though in a jumpy or little-traded share the fill can land away from the last quote.
• Limit order: buy no higher, or sell no lower, than a price you set. You control the price but may not be filled.
• Stop order: sleeps until a trigger price trades, then fires as a market order; people use it to cap losses. After a gap it may execute a long way past the trigger.

Worked example (illustrative figures)

You buy 25 shares at $80, a $2,000 purchase. The company pays an annual dividend of $2.40 per share, a yield of $2.40 ÷ $80 = 3%, or $60 a year on your holding before tax. If the price rises to $88 you are up 25 × $8 = $200, or 10%, before costs. If it falls to $72 you are down the same amount. The dividend is not guaranteed; companies can cut or cancel it.

Indices and funds

An index tracks a basket of shares to show how a market or sector is doing. The S&P 500 covers around 500 large US companies weighted by float-adjusted market value; the Dow Jones Industrial Average follows 30 companies and is weighted by price; the FTSE 100 covers the largest London-listed firms; the DAX tracks 40 German companies; India's Sensex follows 30 large BSE-listed companies (see our Sensex explainer).

You cannot buy an index directly, but index funds and exchange-traded funds try to match one. For beginners they solve the hardest problem: a single company can fail, while a fund holding hundreds of companies spreads that risk. Funds charge an annual fee, so compare the ongoing charge as carefully as the trading commission.

Why share prices move

In the short run a share price moves whenever buyers are keener than sellers or the reverse, which can happen for reasons that have little to do with the company: a change in interest rates, a shift in mood across the whole market, or a large fund selling. Over longer periods prices tend to follow what investors expect the company to earn.

One common yardstick is the price-to-earnings ratio, the share price divided by the company's earnings per share. Using illustrative figures, a share at $80 with earnings of $4 per share has a ratio of 80 ÷ 4 = 20: investors are paying twenty times one year's profit. A high ratio usually signals that the market expects fast growth, which leaves more room for disappointment; a low one can mean the company is cheap or that investors expect trouble. No single ratio tells you whether to buy.

Company results, dividend announcements and changes in guidance are published on set dates, and prices can jump sharply when they come out. Checking the date of the next results before buying avoids surprises.

The stock market for beginners: habits that help

• Know what you own. Be able to explain in a sentence how the company or fund makes money.
• Spread the risk. Holding many companies across sectors and countries reduces the damage from any single failure.
• Think in years. Money you may need within a few years is usually better kept out of shares, which can stay down for long periods.
• Keep costs low. Fees compound in the same way returns do, quietly and relentlessly.
• Ignore tips from strangers. A share promoted in a group chat or by an unknown "analyst" is a classic setup for a pump-and-dump; see how to spot scams.

Investing, trading and CFDs

Buying shares to hold for years is a different activity from trading them for short-term moves. Long-term investors rely on companies growing their earnings over time and accept that prices will fall, sometimes by a third or more, along the way. Short-term traders try to profit from price swings, which requires timing, discipline and low costs, and most do worse than a simple fund.

Many platforms also sell CFDs on shares, contracts that pay the difference in price without you owning the share. They allow leverage, capped at 5:1 for retail clients in the UK and EU, which magnifies losses as well as gains, and you usually have no voting rights. Owning the real share and holding a CFD are not the same thing.

Costs to watch

• Commission per trade, sometimes zero, in which case the broker earns in other ways.
• Spread between bid and ask, wider on smaller companies.
• Foreign exchange charges when you buy shares priced in another currency, often a percentage hidden in the rate.
• Account or custody fees and fund ongoing charges.
• Taxes such as stamp duty on UK share purchases, and tax on dividends and gains, depending on your country and account type.

Our guide to trading fees shows how small percentages add up. In the UK, holding shares inside an ISA shelters gains and dividends from tax up to the annual allowance of £20,000 for 2026/27.

Protections and rules

Regulated brokers must keep client assets separate, and many countries run investor compensation schemes if a broker fails with assets missing. These schemes do not cover investment losses. In the US, the pattern day trader rule that required $25,000 for frequent day trading in margin accounts is being replaced under a FINRA change approved by the SEC in April 2026, which moves to an intraday margin approach; check how your broker applies it. Whatever the market, confirm the broker is authorised by your regulator before you send money, as explained in how to choose a broker.

Sources

• US Securities and Exchange Commission, T+1 settlement
• FINRA pattern day trading rule change approved by the SEC, April 2026
• UK Financial Conduct Authority, CFD rules for retail clients
• HM Revenue and Customs, ISA allowances 2026/27