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Equities, explained
Learn what stocks are, how they trade, and how to read the market coverage built around them.
What an equity is and why stocks exist
An equity is an ownership stake in a company. When people say a stock, they usually mean a share of equity in a public company.
Companies issue stock to raise money, and investors buy it hoping the business will grow in value over time. Stockholders do not own the whole company, only a small slice of it.
How public companies become tradable stocks
A private company becomes public through a listing process that lets its shares trade on an exchange. From that point on, buyers and sellers can exchange shares in the open market.
The company’s shares may be listed on one or more exchanges, but the exact trading rules, fees, and access can vary by venue and broker.
How stock prices are set by supply and demand
A stock price is the last agreed-upon price between a buyer and a seller. It changes whenever new orders meet in the market at a different level.
If more people want to buy than sell, the price tends to rise. If more people want to sell than buy, the price tends to fall.
Why a stock can move even when the company did not change
Stock prices reflect expectations about the future, not just the company’s current results. A business can report strong earnings and still fall if investors expected even more.
Prices also react to interest rates, economic data, industry trends, and broad market sentiment. In other words, a stock is part business report, part forecast, part emotion.
How to read the daily stock coverage on a market site
Daily market pages usually show the last trade, the day’s change, and the percent move. The dollar change tells you how much the share price moved, while the percent move shows the move relative to the starting price.
Coverage may also include volume, which is the number of shares traded, and market cap, which is the company’s share price multiplied by shares outstanding. These numbers help you judge how actively a stock is trading and how large the company is.
What market capitalization says about company size
Market capitalization, often called market cap, is a rough way to measure a company’s size. It is calculated by multiplying the share price by the number of shares in circulation.
Two companies can have the same stock price and very different market caps if one has far more shares outstanding. That is why share price alone does not tell you how big a company is.
Why earnings reports matter so much to stock traders
Public companies usually report results every quarter. Those reports often include revenue, profit, guidance, and management commentary about how the business is performing.
Markets often move not just on the numbers themselves, but on how those numbers compare with expectations. A company can beat estimates and still see its stock drop if investors were looking for a bigger surprise.
Common questions
What is the difference between a stock and an equity?
In everyday market language, they usually mean the same thing. Equity is the broader term for ownership in a company, while stock is the common word for a tradable share of that ownership.
Does a higher stock price mean a company is worth more?
Not by itself. A high share price can simply mean the company has fewer shares outstanding, while a lower share price can reflect a larger share count. Market cap gives a better rough comparison of total size.
Why do stock prices move before a company announces news?
Markets try to anticipate news before it arrives. If traders expect better results, they may buy ahead of time, which can push the price up before the announcement.
What does volume tell me about a stock?
Volume shows how many shares changed hands during a period. Higher volume can mean more interest or stronger disagreement about value, while low volume can mean fewer traders are active.
Are all stocks the same?
No. Some stocks represent profitable, steady businesses, while others belong to younger or more volatile companies. Stocks can also differ by industry, share class, voting rights, and how much they tend to swing in price.