Stock
A stock is a financial instrument that represents a unit of ownership in a corporation, entitling the holder to a proportional claim on the company's assets and earnings. In the United States, stocks are bought and sold on regulated exchanges such as the NYSE and NASDAQ.
When a corporation in the United States wants to raise capital without taking on debt, one of the most common mechanisms is issuing stock to the public. Each share of stock represents a fractional ownership stake in the issuing company. For example, if Apple Inc. has 15 billion shares outstanding and you own 150 shares, you technically own one ten-billionth of the enterprise — entitled to the same proportional fraction of its net assets and future earnings.
Historically, the U.S. stock market has been one of the primary engines of wealth creation for American households. As observed over the past century, broad equity ownership has allowed ordinary investors to participate in the growth of companies like Ford, General Electric, and more recently, Amazon and Microsoft — businesses that transformed entire industries. The Securities and Exchange Commission (SEC) regulates how stocks are issued and traded to protect investors from fraud and misinformation.
There are two primary types of stock: common stock and preferred stock. Common stockholders typically have voting rights at annual shareholder meetings and may receive dividends when the company distributes profits. Preferred stockholders, on the other hand, generally receive fixed dividends and have priority over common shareholders in the event of a company liquidation — though they usually forgo voting rights.
The value of a stock fluctuates based on a wide range of factors including corporate earnings, macroeconomic data, interest rate decisions by the Federal Reserve, and investor sentiment. During the 2008 Global Financial Crisis, for instance, the stocks of major U.S. banks such as Citigroup and Bank of America fell dramatically as investors reassessed the value of mortgage-backed assets on their balance sheets. Conversely, technology stocks recovered rapidly following the 2020 COVID-19 market crash, as demand for digital services surged.
For educational purposes, it is important to understand that owning stock does not give an investor a direct say in day-to-day management. Rather, shareholders elect a board of directors, which in turn oversees the executive team. The SEC requires publicly traded companies to file quarterly (10-Q) and annual (10-K) reports, giving investors visibility into financial performance and significant business risks.