Stock

A stock — also called a share or an equity — is a unit of ownership in a public company. Each share represents a small, transferable slice of the company’s profits, its voting power, and its residual value if it is ever sold or wound up. Stocks are the central instrument of every stock market.

What a share actually entitles you to

Buying a single share of, say, Apple does not let you walk into a factory and demand a phone. It does, however, give you three things, in this order of practical importance:

1. A residual claim on profits. After the company has paid its workers, its suppliers, its lenders, and the tax authorities, whatever is left belongs to the shareholders, collectively. The board can choose to send some of that back to you as a dividend or to keep it inside the business in the hope that future profits will be even larger.
2. A vote. One share, conventionally, is one vote on matters the board puts to shareholders — electing directors, approving large mergers, and a handful of other decisions. In practice, the average retail investor’s vote is decisive only when concentrated through institutional managers.
3. A claim in liquidation. If the company is ever sold or dissolved, the shareholders divide whatever is left after the bondholders and other senior creditors have been paid in full. This is almost always either spectacular or zero.

In return for those rights you accept a single, hard constraint: shareholders are paid last. Every other claimant — lenders, employees, suppliers, the government — has to be made whole before a single cent reaches you. That is why stocks have historically offered higher returns than bonds: you are being compensated for standing at the back of the queue.

Common stock and its variations

The default kind of share is common stock, and that is what nearly every reference to “the stock” of a company means. A few important variants exist:

• Preferred stock sits between bonds and common stock. Preferred shares pay a fixed dividend, ahead of common shareholders, and have priority in liquidation, but they typically carry no vote and no upside if the company does well. They behave more like a bond than a share.
• Class A / Class B / Class C shares. Some companies — Alphabet, Berkshire Hathaway, Meta — issue more than one class of common stock to keep voting power concentrated in the hands of founders or families. The economics are similar across classes; the votes are not.
• Restricted stock and employee shares are common stock subject to a vesting schedule or transfer restrictions, usually given to employees as compensation. Once vested, they convert into ordinary shares.

For a beginner, the practical takeaway is: when in doubt, you are dealing with common stock.

How a share gets its price

A share has no inherent price. Its value is whatever someone is willing to pay for it right now, and that price moves continuously while the stock exchange is open. Three forces dominate.

Earnings. Over the long run, share prices track the profits of the underlying business. The most widely watched single number for any stock is its earnings per share. The most widely watched single ratio is the price-to-earnings ratio — how many dollars investors are paying for each dollar of annual profit.

Expectations. Markets do not reward what has already happened; they reward what is about to happen. A great company whose growth is decelerating can see its share price fall; a struggling company whose losses are shrinking faster than expected can soar.

Sentiment and liquidity. In the short run, prices move with the mood of the market, the news cycle, and how many people are buying or selling — see bull market, bear market, and recession for the broad regimes these add up to.

The total dollar value of all of a company’s outstanding shares — share price times share count — is its market capitalization, the single most useful first-pass measure of corporate size.

How returns reach the shareholder

Owning a share generates returns in exactly two ways:

1. Dividends — cash the company elects to send back to shareholders, typically quarterly. Not every company pays one; some prefer to reinvest every penny of profit.
2. Capital gains — the increase (or decrease) in the share price between when you bought and when you sold. Until you sell, the gain is “unrealised,” but it is still what is reflected in the value of your portfolio.

Over the long run, those two streams have combined to deliver roughly 9–10% per year for the US stock market, with inflation absorbing two to three points of that. That historical record is the engine behind compound interest calculations and the case for long-term investing.

Common ways to own stock

Most individuals own stock not by buying single shares but through pooled vehicles:

• An index fund or ETF holds hundreds or thousands of stocks in one wrapper, tracking a published list such as the S&P 500. This is now the default form of stock ownership for most US households.
• A mutual fund does the same thing but prices once a day and trades off-exchange.
• A hedge fund does the same thing only for wealthy or institutional clients, often with concentrated bets and the ability to short stocks.

To buy any of these — or single shares — you go through a broker, which routes your order to a stock exchange.

Risks worth knowing

A share is not a deposit. Three risks are intrinsic to the instrument:

• Market risk. When the wider market falls, most stocks fall with it, even good ones. A stock’s tendency to move with the market is summarised by its beta.
• Company-specific risk. A single firm can stumble — bad management, fraud, a missed product cycle, a lawsuit — and erase shareholder equity even while the broader market does fine. The way to neuter this is diversification.
• Permanent loss. Companies do go bankrupt. When they do, shareholders, as the last in line, typically lose everything. This is the price of being the residual claimant.

The right defence against the first two is structural: hold a diversified basket, sized to a long-term asset allocation you can live with through a bear market. The right defence against the third is the same.

See also