What Is a Stock? A Plain-English Guide for Beginners

A stock is a tiny slice of ownership in a real company. Buy one share and, legally, you own a small piece of that business.

The one-sentence definition

A stock (also called a share or equity) represents partial ownership of a company. If a company has issued one million shares and you hold one, you own one-millionth of it. That ownership is real: it entitles you to a proportional claim on the company's assets and profits, however small.

Why do companies sell stock at all?

Companies sell shares to raise money. Building factories, hiring staff, and funding research all cost cash. Instead of only borrowing, a company can sell ownership slices to investors and use that money to grow. The first time it sells shares to the public is called an initial public offering, or IPO.

In exchange, the new owners (shareholders) hope the company becomes more valuable over time, which can make their shares worth more.

How owners can make money

There are two main ways owning a share can pay off:

• Price appreciation. If the company grows and more people want to own it, the share price can rise. Selling later for more than you paid is a capital gain.
• Dividends. Some companies pay out a portion of their profits to shareholders in regular cash payments. Not every company does this.

Common and preferred shares

Most people buy common shares. These usually come with voting rights (a say in big company decisions, like electing the board) and the potential for dividends and price gains.

Preferred shares are a different class that typically pays a fixed dividend and gets priority over common shares if the company pays out profits or is wound down — but usually carries no voting rights. Beginners most often encounter common shares.

What moves a stock's price?

A share price is simply what buyers and sellers agree on at a given moment. It shifts constantly based on company earnings, news, interest rates, and overall mood in the market. We cover this in depth in why stocks move.

Where stocks are bought and sold

Shares of public companies trade on a stock exchange such as the Toronto Stock Exchange (TSX), the New York Stock Exchange (NYSE), or the Nasdaq. To buy or sell, most people use a broker — a licensed middleman (today usually an app or website) that places orders on the exchange for you.

Each company's stock is identified by a short ticker symbol, like a nickname used for trading.

How stocks fit a beginner's picture

Owning individual stocks means owning specific companies. Many beginners also consider an ETF, which bundles many stocks together in one purchase to spread risk — an idea called diversification.

The key takeaway: a stock is genuine part-ownership of a business. Its value tends to follow, over the long run, how well that underlying business does — though prices can swing sharply in the short term for reasons that have little to do with the company itself.