FinanceFirst financial glossary
What is Stock?
A direct definition, followed by examples, comparisons, related concepts, and the sources that support the explanation.
Written by Asim Ahmad, Founder and Editor, FinanceFirst
Definition
In one sentence about Stock
A stock represents partial ownership (equity) in a publicly traded company. When you buy shares of stock, you become a shareholder entitled to a portion of the company's profits and assets. Stocks have historically delivered the highest long-term returns of any major asset class, averaging about 10% annually for the S&P 500 since 1926.
Why Stocks Matter
Stocks are the primary engine of long-term wealth creation for individual investors. According to data from NYU Stern, U.S. stocks have returned an average of approximately 10% per year (about 7% after inflation) since 1926, far outpacing bonds, gold, and savings accounts. Over any 20-year rolling period in U.S. market history, stocks have never produced a negative return. The stock market allows everyday investors to participate in the growth of the world's largest and most innovative companies. Through stock ownership, you benefit from corporate earnings, dividend payments, and capital appreciation as companies grow in value. Stocks are also highly liquid, meaning you can buy and sell them quickly through brokerage accounts during market hours.
Real-World Example: Growth of $10,000 in Major Stocks
Here is how $10,000 invested in various well-known stocks would have grown over 10 years (2014-2024, approximate total returns including dividends):
| Investment | 2014 Value | 2024 Value | Total Return | Annualized Return |
|---|---|---|---|---|
| Apple (AAPL) | $10,000 | $97,500 | 875% | 25.6% |
| S&P 500 Index (SPY) | $10,000 | $33,800 | 238% | 13.0% |
| Johnson & Johnson (JNJ) | $10,000 | $17,900 | 79% | 6.0% |
| General Electric (GE) | $10,000 | $12,200 | 22% | 2.0% |
| Average Savings Account | $10,000 | $11,200 | 12% | 1.1% |
Key Stock Valuation Metrics
Investors use several formulas to evaluate whether a stock is fairly priced. The most common is the Price-to-Earnings (P/E) ratio, calculated as: P/E = Stock Price / Earnings Per Share. Other useful metrics include dividend yield (Annual Dividends / Stock Price) and earnings per share (Net Income / Shares Outstanding). Here are typical valuation ranges:
| Metric | Formula | Low (Value) | Average | High (Growth) |
|---|---|---|---|---|
| P/E Ratio | Price / EPS | Below 15 | 15-25 | Above 25 |
| Dividend Yield | Annual Dividend / Price | 0-1% | 1.5-3% | 3-6%+ |
| Price-to-Book | Price / Book Value | Below 1.5 | 1.5-3 | Above 3 |
| PEG Ratio | P/E / Earnings Growth Rate | Below 1 | 1-2 | Above 2 |
When to Invest in Stocks
Stocks are appropriate in these situations:
- Long-term goals with a 5+ year time horizon: Stocks have historically recovered from every downturn given sufficient time
- Retirement savings: Stocks should make up the majority of retirement portfolios for younger investors to maximize compound growth
- Building wealth over decades: Consistent investing in diversified stock funds is the most proven path to financial independence
- Generating passive income: Dividend-paying stocks provide regular income that grows over time as companies increase their payouts
- Keeping pace with inflation: Stocks have historically outpaced inflation by a wide margin, preserving and growing purchasing power
- When you have an emergency fund in place: Only invest money in stocks that you will not need for at least 5 years
Common Stock Investing Mistakes
Avoid these frequent errors that cost investors significant returns:
- Trying to time the market: Missing just the 10 best trading days over a 20-year period can cut your returns by more than half. Staying invested consistently outperforms timing strategies
- Panic selling during downturns: The S&P 500 has recovered from every bear market in history. Selling during a decline locks in losses and misses the recovery
- Concentrating in a single stock: Even great companies can decline sharply. Diversification through index funds protects against individual company risk
- Trading too frequently: Active trading generates taxes and fees that reduce returns. Studies show most day traders lose money over time
- Ignoring fees and taxes: High-fee mutual funds and short-term capital gains taxes significantly reduce net returns compared to low-cost index funds held long term
Side-by-side
Stocks vs. Bonds vs. Real Estate
| Feature | Stocks | Bonds | Real Estate |
|---|---|---|---|
| Historical annual return | ~10% (S&P 500) | ~5% (U.S. aggregate) | ~7-8% (with leverage) |
| Volatility | High (20-30% swings) | Low to moderate | Moderate |
| Liquidity | Very high (instant) | High | Low (months to sell) |
| Minimum investment | $1 (fractional shares) | $1,000+ | $20,000+ (down payment) |
| Income type | Dividends (variable) | Interest (fixed) | Rent (variable) |
Key distinction: A diversified portfolio often includes all three asset classes to balance risk and return.
Stocks are the most powerful wealth-building tool available to individual investors. Rather than trying to pick winners, invest consistently in low-cost, diversified index funds that track the broad market. Start as early as possible, stay invested through market ups and downs, and let compound growth work in your favor over decades.
Put the concept in context
Tools and guides for the next question
Common questions
Frequently asked questions
How much money do I need to start investing in stocks?
You can start investing with as little as $1 thanks to fractional shares, now offered by most major brokerages including Fidelity, Schwab, and Robinhood. Many brokerages have no account minimums and offer commission-free trading. The amount you start with matters less than starting early and investing consistently.
What is the difference between a stock and a share?
The terms are often used interchangeably in casual conversation. Technically, 'stock' refers to ownership in a company generally, while 'share' refers to a specific unit of that ownership. When you buy 10 shares of Apple stock, you own 10 units of Apple's equity. The distinction is mostly semantic for everyday investors.
Are stocks risky?
Individual stocks can be very risky since any single company can decline significantly or even go bankrupt. However, diversified stock portfolios (through index funds) have never lost money over any 20-year period in U.S. market history. The key risk-reduction strategies are diversification and a long time horizon. Stocks are risky in the short term but have been the safest wealth-building asset over the long term.
Should I invest in individual stocks or index funds?
For most investors, index funds are the better choice. Research from S&P Dow Jones shows that over 90% of actively managed funds underperform their benchmark index over 15-year periods. Index funds provide instant diversification, lower costs, and require no stock-picking expertise. Individual stocks can supplement an index fund core for experienced investors.
Evidence you can inspect
Sources and further reading
Use these links to check the underlying definition, rule, dataset, or consumer guidance. External pages can change after publication.