What you own when you buy a stock

When you buy a stock, you own a small piece of a company. If a company has issued one million shares and you buy one share, you own one millionth of that company. That ownership stake is real — it entitles you to a proportional claim on the company's profits, and in some cases a vote on company decisions.

The company does not lend you money or give you anything physical. Instead, your brokerage firm (the financial company through which you buy) holds the share in an account registered to you. You can sell that share to someone else at any time the market is open, and the price you get depends on what other buyers are willing to pay at that moment.

Stock prices move because investors constantly reassess what they think a company is worth. If a company reports strong earnings, more people want to buy, the price rises. If news breaks that the company faces a lawsuit, more people want to sell, the price falls. You make money if you sell for more than you paid. You lose money if you sell for less.

Key Takeaways

  • Buying a stock means owning a fractional share of a real company, and you can sell that share whenever the market is open.
  • Stock prices change throughout each trading day based on supply and demand, and you profit or lose based on the difference between your purchase price and sale price.
  • You need a brokerage account to buy stocks, and most brokerages now charge no commission per trade, though some charge account fees or require minimum balances.
  • Stocks are riskier than savings accounts or bonds because company value can fall sharply, and you could lose your entire investment.
  • Diversification — owning many stocks across different industries — reduces the risk that one company's failure will wipe out your money.

How you actually buy and sell a stock

To buy a stock, you first open a brokerage account with a firm like Fidelity, Charles Schwab, E*TRADE, or Vanguard. You fund the account by transferring money from your bank. Then you search for the stock by its ticker symbol (a short code like AAPL for Apple or MSFT for Microsoft), decide how many shares you want, and place an order.

Your order goes to an exchange — a marketplace where stocks are bought and sold. The major U.S. exchanges are the New York Stock Exchange (NYSE) and the NASDAQ. When your buy order matches a sell order from someone else, the trade executes. You now own the shares, and they appear in your account within one to two business days (the settlement period).

Selling works the same way in reverse. You log into your brokerage account, select the stock you want to sell, enter the number of shares, and place a sell order. When it matches a buyer, the trade executes and the cash lands in your account within one to two business days. You can then withdraw that cash to your bank or use it to buy other stocks.

What costs are involved

Most major brokerages charge zero commission per trade, meaning you pay nothing to buy or sell a stock. This was not always true — until roughly 2019, brokerages charged $5 to $10 per trade. The shift to zero-commission trading made stock investing more accessible to people with smaller accounts.

However, zero commission does not mean zero cost. Some brokerages charge monthly account maintenance fees (often waived if you maintain a minimum balance, typically $500 to $2,500). Some charge fees to transfer your account to another brokerage. Some charge for certain research tools or premium features. Read the fee schedule on the brokerage's website before you open an account.

You also pay taxes on your gains. If you hold a stock for less than one year and sell it for a profit, that profit is taxed as ordinary income at your regular tax rate. If you hold it for more than one year, the profit is taxed at the lower long-term capital gains rate (0%, 15%, or 20%, depending on your income). If you sell at a loss, you can deduct up to $3,000 of losses against other income in that year.

The difference between stock price and company value

A stock's price is not the same as what the company is actually worth. Price is simply what someone is willing to pay right now. A company might be worth far more or far less than its stock price suggests, depending on whether investors are optimistic or pessimistic about its future.

This gap creates both opportunity and risk. If you believe a stock is underpriced — that the company will grow faster than the market expects — you might buy, hold, and profit when others eventually agree with you. But if you are wrong, or if the company's situation deteriorates, the price can fall sharply. A stock that costs $50 today could cost $20 in six months if the company misses earnings targets or faces unexpected competition.

This is why stocks are riskier than savings accounts or bonds. A savings account earns a fixed, may provide rate. A bond is a loan to a company or government, and you get your money back on a set date. A stock has no may provide return and no maturity date. The company could fail entirely, and you could lose everything you invested.

How dividends work

Some companies pay dividends — regular cash payments to shareholders. A company might pay a dividend of $0.50 per share each quarter, meaning if you own 100 shares, you receive $50 every three months. Dividends come from company profits and are optional; the company's board decides whether to pay them and how much.

Dividends are taxed differently depending on the type. may have access to dividends (from U.S. companies held for at least 60 days around the payment date) are taxed at the long-term capital gains rate. Non-may have access to dividends are taxed as ordinary income. The brokerage reports dividend income to you and to the IRS on a Form 1099-DIV each January.

Receiving a dividend does not mean you are making money overall. If a company pays a $1 dividend per share and the stock price falls $2 that same day, you are down $1 per share despite the payment. Dividends are one component of return; the other is price appreciation or depreciation.

Why diversification matters

Buying a single stock concentrates your risk. If that company faces a crisis — a product recall, a failed merger, a change in leadership — your entire investment can suffer. Diversification means spreading your money across many stocks in different industries, so no single company's failure destroys your portfolio.

Many people diversify by buying index funds or exchange-traded funds (ETFs) instead of individual stocks. An index fund holds dozens or hundreds of stocks that track a market index like the S&P 500 (the 500 largest U.S. companies). You buy one fund and own a piece of all 500 companies. If one company's stock falls 50%, it barely dents your fund because it is only one small part of the whole.

Diversification does not eliminate risk — if the entire market falls, your diversified portfolio falls too. But it reduces the risk that one bad decision or one company's failure will wipe you out. Most financial advisors recommend diversification for people who are not professional stock pickers.

How market hours and timing affect your trades

U.S. stock markets are open Monday through Friday, 9:30 a.m. to 4:00 p.m. Eastern Time. If you place an order during these hours, it executes during the trading day at the current market price. If you place an order outside these hours (early morning, evening, or weekends), it is held and executes when the market opens the next trading day.

You can place a limit order, which tells your brokerage to buy or sell only at a specific price or better. If you want to buy Apple at $150 but it is currently trading at $155, you can place a limit order to buy at $150. If the price falls to $150 or below before the order expires, it executes. If the price never falls that low, the order expires unfilled.

You can also place a stop-loss order, which automatically sells your stock if the price falls to a certain level. If you bought a stock at $100 and want to limit your loss, you might place a stop-loss order at $80. If the price falls to $80, the stock sells automatically. This protects you from catastrophic losses but can also lock in losses during temporary price dips.

Frequently Asked Questions

Do I need a lot of money to start investing in stocks?

No. Most brokerages have no minimum account balance, and you can buy a single share of any stock. If a stock costs $200 per share and you have $200, you can buy one share. Some brokerages also offer fractional shares, meaning you can invest any dollar amount — $50, $100, $500 — and own a portion of a share.

What happens if the company I own stock in goes bankrupt?

Your stock becomes worthless. Stockholders are last in line when a bankrupt company's assets are sold. Creditors and bondholders get paid first. In most cases, common stockholders receive nothing. This is why diversification matters — if you own 50 stocks and one goes bankrupt, you lose only that one investment, not your entire portfolio.

Can I lose more money than I invested?

No, not with regular stock purchases. If you buy 100 shares at $10 per share ($1,000 total) and the stock falls to $0, you lose $1,000 — your entire investment. You cannot lose more than you put in. However, if you use margin (borrowing money from your brokerage to buy stocks), losses can exceed your initial investment.

How do I know which stocks to buy?

Research the company's financial statements, earnings history, and competitive position. Read analyst reports and news coverage. Many brokerages provide free research tools and educational resources. If you are new to investing, consider starting with index funds or ETFs rather than picking individual stocks, since they offer instant diversification.

When should I sell a stock I own?

That depends on your goals and strategy. Some investors sell when the stock reaches a target price. Others hold for years to benefit from long-term growth and lower tax rates. Some sell if the company's fundamentals deteriorate or if they need the money. There is no single right answer — it depends on your situation and investment plan.