What Are Stocks? Types of Stocks and How They Work

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A stock (also called a share or equity) is a security that represents fractional ownership in the corporation that issued it. Owning stock gives you a claim on part of the company’s earnings and on whatever assets remain after creditors are paid. It also gives you the right to sell that claim to someone else. Companies issue stock to raise money. Investors buy it hoping the company’s profits, paid out as dividends or reflected in a higher share price, will reward them.

How Stocks Work

A company’s ownership is divided into shares. The fraction you own depends on how many shares you hold relative to the number outstanding:

Ownership % = Shares you own ÷ Total shares outstanding × 100

Hypothetical example: a company has 1,000 shares outstanding and you hold 100 of them. You own 10% of the shares. That gives you a claim to 10% of the earnings distributed to common shareholders and 10% of any residual value if the company were wound up.

“Stock” and “shares” are often used interchangeably. In careful usage, “stock” is the general term for ownership in one or more companies, while “shares” are the countable units of a specific company (“she owns 50 shares of that company”). A fund holds many stocks.

What shareholders actually own

A corporation is treated by law as a legal person. It can own property, borrow money, sign contracts, pay taxes and be sued. The company’s offices, equipment and cash belong to the corporation, not to its shareholders. What a shareholder owns is the shares themselves, plus the rights attached to them.

This has two practical consequences:

1. Limited liability. Corporate property is legally separate from shareholders’ property. If the company goes bankrupt, a court can order its assets sold, but it cannot reach your personal assets to pay the company’s debts. Your loss is capped at what you paid for the shares, even if they become worthless.
2. Separation in the other direction. If a major shareholder goes bankrupt, their creditors can claim the shareholder’s shares. They cannot seize the company’s assets.

So holding 33% of a company’s shares does not mean you own a third of its buildings. You own a third of the votes and of the claim on residual earnings. This is known as the separation of ownership and control.

Shareholder rights

Owning common stock typically gives you three core rights:

• Voting at shareholder meetings, including electing the board of directors and approving major corporate actions.
• Dividends, if and when the board declares them.
• Transfer, meaning the right to sell your shares to another investor.

Ordinary shareholders do not run the business. The board of directors oversees the company and appoints officers, such as the chief executive officer, to manage it. A holder of a majority of voting shares can elect the board and so indirectly steer the company. That is why an acquirer buys all, or a controlling share, of its outstanding stock.

A share’s value ultimately rests on its claim to the company’s profits. Many companies, especially growth-focused ones, pay no dividend and reinvest earnings instead. Those retained earnings still belong to shareholders economically and, investors expect, show up in a higher share price over time. Earnings per share (EPS) and the P/E ratio put a single share in the context of those profits.

Types of Stock: Common vs. Preferred

The two main classes of stock differ in how they split control and priority.

Common stock is what most people mean by “stocks.” Preferred stock behaves partly like a bond, since its appeal is priority on payments rather than voting power or open-ended growth. Some companies also issue several classes of common stock with different voting rights, so the terms of a specific class matter more than its label.

Other ways stocks are grouped

• By size: large-cap, mid-cap and small-cap, based on market capitalization (share price × shares outstanding).
• By style: growth stocks, which reinvest heavily and pay little or no dividend, and value or dividend stocks, which trade at lower multiples of earnings or pay regular income.
• By sector: technology, financials, healthcare, energy and so on.
• By listing: domestic shares, or foreign companies accessed through instruments such as American Depositary Receipts.

These labels are conventions, not legal categories, and their definitions vary between index providers. A stock screener filters companies by attributes like these.

How Companies Issue Stock and How Investors Buy It

Stock changes hands in two markets:

• Primary market. The company sells new shares and receives the cash. A private company’s first sale to the public is an initial public offering (IPO). Later sales of new shares are secondary or follow-on offerings.
• Secondary market. Investors trade existing shares with each other on exchanges such as the NYSE and Nasdaq. The company receives nothing from these trades.

Most individual investors buy through a brokerage account. A quote shows a bid (the highest price a buyer is offering) and an ask (the lowest price a seller will accept). The gap between them is the spread. Prices move with supply and demand, which respond to earnings, interest rates, economic data and investor sentiment.

Dilution and buybacks

The number of shares outstanding is not fixed. A company can issue new shares when it needs capital. If you don’t buy any of the new shares, your percentage ownership shrinks. Hypothetical example: the company with 1,000 shares issues 250 more. Your 100 shares now represent 100 ÷ 1,250 = 8% instead of 10%.

The reverse is a stock buyback, in which the company repurchases its own shares. With fewer shares outstanding, each remaining share represents a larger slice of earnings, which can support a higher share price.

How You Earn Money From Stocks

Shareholders can profit in two ways.

Dividends are cash distributions of profits, declared by the board. Hypothetical example: a company with 1,000 shares outstanding declares a $5,000 dividend. Each share receives $5,000 ÷ 1,000 = $5. Your 100 shares earn $500 before taxes.

Capital appreciation is a rise in the share price. Hypothetical example: you buy a share at $10 and later sell it at $11. Your gain is $1 per share, a 10% return before trading costs and taxes. The gain is only realized when you sell. Until then it is a paper gain that can disappear.

Total return combines both: (ending price − starting price + dividends received) ÷ starting price.

Stocks vs. Bonds

Both are ways for companies to raise capital, but they give investors very different claims.

• Stockholders are owners. They get a residual claim: whatever is left after everyone else is paid. There is no promised return, and upside is not capped.
• Bondholders are creditors. They lend money in exchange for contractual interest and repayment of principal at maturity.
• Bankruptcy priority. Creditors are paid first when assets are sold, then preferred shareholders, then common shareholders, who often receive nothing.

That ordering is why stocks are considered riskier than bonds issued by the same company. The trade-off is that, over long periods in U.S. historical data, stocks have delivered higher returns than bonds and Treasury bills. Past results don’t guarantee future ones.

Limitations and Risks of Stocks

• Price risk. Share prices can fall sharply because of market conditions or company decisions, such as an expansion that fails or a costly merger. Individual stocks can go to zero.
• No guaranteed income. Dividends can be cut or suspended at the board’s discretion.
• Concentration. A single stock ties your outcome to one company. Broad indexes such as the S&P 500 or the Dow Jones Industrial Average track baskets of stocks, and funds based on them spread company-specific risk.
• Limited control. Minority shareholders have votes but little practical say over management.
• Inflation and time horizon. Stocks can lag inflation for years, so money needed in the short term carries a real risk of being withdrawn at a loss.

Distinctions Readers Often Confuse

• Stock vs. equity. “Equity” can mean stock itself, or the accounting value of a company’s assets minus liabilities (shareholders’ equity).
• Stock vs. money. Stock is a financial asset, not legal tender. It has to be sold for cash, at whatever price the market offers at that moment.
• Stock vs. “in stock.” In retail and accounting, stock also means inventory: goods a business holds for sale. That meaning is unrelated to shares.
• Stock vs. stock market. A stock is the security. The stock market is the network of exchanges and venues where shares trade.

FAQs

The Bottom Line

Anyone buying shares, directly or through a fund, holds a residual claim with no promised return and full exposure to losses down to zero. Stocks have outpaced bonds and Treasury bills over long periods in U.S. data, but they rank last in bankruptcy and can lag inflation for years. Index funds spread company-specific risk, and money needed soon carries a real chance of being withdrawn at a loss.