Stocks are one of the most powerful wealth-building tools available to everyday people. But what exactly is a stock, and why do companies sell them? In this lesson, we break down ownership shares, how companies go public, and the forces that drive stock prices up and down.
Disclaimer: This is educational content, not financial advice. Always consult a qualified financial professional before making investment decisions.
Owning a Piece of a Company
A stock (also called an equity or a share) represents a unit of ownership in a company. When you buy a stock, you are purchasing a small piece of that business. If a company has issued 1,000,000 shares and you own 1,000 of them, you own 0.1% of the company.
That ownership stake entitles you to a proportional claim on the company's assets and earnings. If the company grows and becomes more profitable, the value of your shares typically rises. If the company struggles, the value may fall. In this way, stockholders share in both the upside and the downside of the business.
Ownership also grants you certain rights. As a shareholder, you generally have the right to vote on major corporate decisions - such as electing the board of directors - and to receive dividends if the company chooses to distribute a portion of its profits. Not all companies pay dividends, however. Many fast-growing companies reinvest all their earnings back into the business instead.
Why Companies Issue Stock
Companies need money to grow - to build factories, hire employees, develop new products, or expand into new markets. There are two main ways to raise that capital:
- Debt financing: Borrowing money through loans or bonds. The company is contractually obligated to pay the money back with interest, but default is possible if the business cannot meet its obligations.
- Equity financing: Selling ownership shares (stock) to investors. The company receives cash without the obligation to repay it, but the original owners give up a portion of their ownership and future profits.
Issuing stock allows a company to raise large amounts of capital without taking on debt. This can be especially valuable for young companies that may not yet have steady revenue to support loan repayments. The trade-off is dilution: the more shares a company issues, the smaller each existing shareholder's percentage of the company becomes.
How Companies Go Public: The IPO
When a privately held company decides to sell shares to the general public for the first time, it goes through an Initial Public Offering (IPO). This is a major event in a company's life. Here is a simplified look at the process:
- Preparation: The company hires investment banks (called underwriters) to help manage the offering. The company must file detailed financial disclosures with regulators, such as the Securities and Exchange Commission (SEC) in the United States.
- Pricing: The underwriters assess investor demand and help set an initial share price. This involves a "roadshow" where company leaders present the business to potential institutional investors.
- Launch day: Shares begin trading on a public stock exchange, such as the New York Stock Exchange (NYSE) or the Nasdaq. Anyone with a brokerage account can now buy and sell those shares.
- Ongoing obligations: Once public, the company must regularly report its financial results, follow strict governance rules, and maintain transparency with shareholders.
Primary Market vs. Secondary Market
Understanding the difference between these two markets is essential for grasping how stocks actually change hands:
Primary Market
The primary market is where new securities are created and sold for the first time. During an IPO or a follow-on offering, the company sells shares directly to investors, and the proceeds go to the company itself. Think of this as buying directly from the manufacturer.
Secondary Market
The secondary market is where previously issued shares are traded between investors. When you buy a stock on the NYSE or Nasdaq, you are almost always buying from another investor, not from the company itself. The company receives no money from secondary market trades. This is like buying a used car from another person rather than from the dealership.
The vast majority of daily stock trading happens on the secondary market. The primary market is active only when companies issue new shares.
Who Participates in the Stock Market?
The stock market is made up of a diverse set of participants, each playing a different role:
- Individual (retail) investors: Everyday people like you who buy and sell stocks through brokerage accounts. Thanks to commission-free trading platforms, participating has become more accessible than ever.
- Institutional investors: Large organizations such as mutual funds, pension funds, insurance companies, and hedge funds. They manage enormous pools of money on behalf of clients and often have significant influence on stock prices due to the size of their trades.
- Market makers: Firms that stand ready to buy and sell specific stocks at publicly quoted prices. They provide liquidity - ensuring that there is always someone willing to trade with you - and they profit from the small difference between the buying and selling price, known as the bid-ask spread.
Common Stock vs. Preferred Stock
Not all stock is created equal. Companies can issue different classes of stock with different rights attached:
Common Stock
Common stock is the type most people are referring to when they talk about "stocks." Common shareholders have voting rights (typically one vote per share) and may receive dividends, but dividends are not guaranteed. If a company goes bankrupt, common shareholders are last in line to receive any remaining assets - after bondholders and preferred shareholders.
Preferred Stock
Preferred stock is a hybrid between a stock and a bond. Preferred shareholders typically receive fixed dividend payments before common shareholders and have a higher claim on assets in the event of bankruptcy. However, they usually do not have voting rights. Preferred stock tends to be less volatile than common stock but also offers less upside potential.
For most individual investors, common stock is the primary type they will encounter and trade. Preferred stock is more commonly held by institutional investors seeking steady income.
Why Do Stock Prices Change?
At its core, a stock's price is determined by supply and demand. If more people want to buy a stock than sell it, the price goes up. If more people want to sell than buy, the price goes down. But what drives those buying and selling decisions? Several key factors:
- Company performance: Earnings reports, revenue growth, new product launches, and management changes all influence how investors feel about a company's future. Strong results tend to push prices higher; disappointing results push them lower.
- Market sentiment: The overall mood of investors matters. During periods of optimism (a bull market), prices tend to rise broadly. During periods of fear (a bear market), even healthy companies can see their stock prices fall.
- Economic conditions: Interest rates, inflation, unemployment, and GDP growth all affect investor expectations and, by extension, stock prices.
- Industry trends: Shifts in technology, regulation, or consumer behavior can lift or drag entire sectors. For example, the rise of electric vehicles has boosted stocks across the EV supply chain.
- News and events: Geopolitical events, natural disasters, and unexpected headlines can cause rapid price swings as investors reassess risk.
Key Takeaways
- A stock represents partial ownership in a company, giving you a claim on its assets and earnings
- Companies issue stock to raise capital without taking on debt, though this dilutes existing ownership
- An IPO is the process by which a private company first sells shares to the public
- The primary market is where new shares are sold by the company; the secondary market is where investors trade shares among themselves
- Key market participants include individual investors, institutional investors, and market makers
- Common stock offers voting rights and growth potential; preferred stock offers priority dividends and more stability
- Stock prices are driven by supply and demand, which are influenced by company performance, market sentiment, economic conditions, and news events