How Does the Stock Market Work? A Plain-English Guide

The stock market is a network of exchanges and brokers where investors buy and sell shares of publicly listed companies. So how does the stock market work day to day? Companies first sell shares to raise money, and after that, investors trade those shares with each other at whatever price a buyer and a seller agree on.

That's the whole engine. Everything else, from index funds to retirement accounts, is built on top of it. This guide explains the pieces in plain English so you can understand what you're actually buying before you learn how to start investing.

What is a stock, exactly?

A stock (or share) is a small unit of ownership in a company. If a company has issued 100 million shares and you own 10, you own a tiny slice of that business.

According to the SEC's Investor.gov, people buy stocks for three main reasons:

• Capital appreciation: the share price rises and you can sell for more than you paid.
• Dividends: some companies pay part of their profits to shareholders.
• Voting rights: common shareholders can usually vote on company matters.

Companies issue stock to raise money for things like paying off debt, launching products or expanding. The first sale to the public is an initial public offering (IPO). After that, the company isn't usually involved when you buy its shares. You buy them from another investor.

Common vs preferred stock

Most shares you'll see are common stock, which carries voting rights and a claim on dividends. Preferred stock usually has no vote but gets paid dividends first and ranks ahead of common stock if the company is liquidated. If a company goes bankrupt, common shareholders are last in line and may get nothing.

Who is actually in the stock market?

The market is made up of buyers, sellers and the firms that connect them. You rarely trade directly with the exchange yourself.

Investor.gov describes broker-dealers as firms that charge a fee to handle trades between buyers and sellers, and clearing agencies as the bodies that compare, clear and settle those trades. In Australia, Moneysmart notes that most shares trade on the ASX and that most people who buy shares use an online broker.

How are stock prices set?

A stock's price is simply the last price at which a buyer and seller agreed to trade. At any moment there's a highest price someone will pay (the bid) and a lowest price someone will accept (the ask). When they meet, a trade happens.

Prices move because those willing buyers and sellers keep changing their minds. Common drivers include:

• Company results: profits, sales, guidance and news.
• Interest rates: higher rates can make safer investments like bonds more attractive relative to stocks.
• The economy: jobs, inflation and consumer spending.
• Expectations and emotions: fear and optimism can push prices far from any calm estimate of value, in both directions.

Over the long run, a company's share price tends to reflect how much profit it's expected to earn. In the short run, almost anything can move it. That's why nobody can reliably predict next week's prices, including the people on TV.

How do you actually buy and sell stocks?

You open an account with a regulated broker or platform, add money, and place an order. The broker sends the order to the market and the trade settles a short time later.

The most common order types, as described by Investor.gov and Moneysmart:

1. Market order: buy or sell right away at the best available price. It's designed to go through quickly, but the price you get may differ from the last price you saw.
2. Limit order: set the most you'll pay or the least you'll accept. It only executes at that price or better, so it may not fill at all.
3. Stop (stop-loss) order: becomes a market order once the price hits a level you choose.

As a beginner, you don't need anything fancier. Our step-by-step guide on how to open a brokerage account walks through the account side, including choosing between cash and margin accounts.

Can you lose money in the stock market?

Yes. Stock prices can fall sharply, and you can lose part or all of what you invest. That's the trade-off for the higher long-term growth potential.

The SEC's Investor.gov puts it bluntly: stocks have historically had the greatest risk and highest returns of the three major asset categories (stocks, bonds and cash). It also notes that large-company stocks as a group have lost money on average about one out of every three years, and some of those losses were dramatic. Investors who held on through long periods have generally been rewarded, but that's a description of the past, not a promise about the future.

A few practical implications:

• Money you need within a few years usually doesn't belong in stocks. A drop right before you need it could force you to sell at a loss.
• Single stocks are riskier than funds. One company can fail; a broad fund spreads that risk across hundreds or thousands.
• Protection schemes cover firm failure, not market losses. In the US, SIPC protects customers if a brokerage fails, but it doesn't cover a fall in the value of your investments. The FSCS in the UK and CIPF in Canada likewise don't pay out just because investments fell in value.

Investing involves risk, including loss of principal, and past performance does not guarantee future results.

Stocks vs the rest: where does the market fit?

Stocks are one building block. Most beginner portfolios combine them with bonds and cash. Bonds are loans to governments or companies that pay interest and are generally less volatile than stocks. Cash is the most stable but tends to lose ground to inflation over long periods.

We compare them in more detail in stocks vs ETFs vs bonds.

Does it work the same way outside the US?

The mechanics are almost identical everywhere; the accounts and regulators differ. Shares trade on national exchanges (NYSE and Nasdaq in the US, the London Stock Exchange in the UK, the TSX in Canada, the ASX in Australia), and you access them through a licensed broker.

What changes by country is the wrapper you hold them in:

• US: taxable brokerage accounts, workplace 401(k) plans and IRAs or Roth IRAs.
• UK: stocks and shares ISAs, SIPPs and workplace pensions.
• Canada: TFSAs, RRSPs and non-registered accounts.
• Australia: your super fund invests in shares for you, and you can also hold shares directly through a broker.

Those wrappers affect tax, not how the market itself works. Our investing for beginners guide covers how to think about them in order.

What should a beginner take from all this?

You don't need to predict the market to take part in it. Most people who invest successfully over decades own broad, low-cost funds, add money regularly and ignore the daily noise.

Before you start, make sure the basics are in place: an emergency fund and a plan for high-interest debt. If you're not there yet, our guide on how to save money is the better first step.

Next steps

• Understand the building blocks: stocks vs ETFs vs bonds.
• See why many beginners start with index funds.
• Explore our beginner investing guide for a structured path from zero to a first investment.
• Or head back to our guide to making money online for other ways to grow your income.