What happens when you buy a share

When you buy a share, you own a small piece of a company. If the company is Apple and you buy one share of Apple stock, you own a fraction of Apple's buildings, equipment, and future earnings. The price of that share moves up and down based on what other people think the company is worth on any given day.

You buy shares through a brokerage — a company licensed to buy and sell stocks on your behalf. You give the brokerage money, tell them which shares to buy, and they execute the trade. You then own those shares until you decide to sell them. If the company pays dividends (a portion of profits returned to shareholders), you receive those payments while you hold the share.

The goal for most people is to buy shares when you think they are underpriced and sell them when the price rises. Some people hold shares for decades; others trade in and out over weeks. The longer you hold, the more you pay in taxes only when you sell — short-term trades are taxed as ordinary income, while shares held over a year get preferential tax treatment in most cases.

Key Takeaways

  • You need a brokerage account (opened online in minutes) and money to deposit before you can buy your first share.
  • Most brokerages now charge zero commission per trade, so the main cost is the bid-ask spread — the difference between what buyers and sellers will pay.
  • Shares are bought and sold during market hours (9:30 a.m. to 4 p.m. Eastern time on weekdays), and your order executes at the current market price or a price you set in advance.
  • You can lose money if the share price falls below what you paid, and there is no government insurance protecting stock holdings the way there is for bank deposits.
  • Diversification — owning many different shares or funds holding many shares — reduces the damage if one company performs poorly.

Opening a brokerage account

A brokerage account is where your money sits and where your shares are held in your name. You open one by visiting a brokerage's website, providing your name, address, Social Security number, and employment information, and linking a bank account. The process takes 10 to 15 minutes. Common brokerages include Fidelity, Charles Schwab, E-Trade, Robinhood, and Webull, though many others exist.

The brokerage will ask you to verify your identity and may place a small temporary hold on your linked bank account to confirm it belongs to you. Once approved (usually within one business day), you can deposit money. You can transfer funds from your bank account to the brokerage, and that money typically arrives within three to five business days. Some brokerages offer faster deposits if you link your account directly.

Choose a brokerage based on the tools it offers, the stocks and funds available, and whether it charges fees. Most major brokerages charge zero commission per trade, so the difference between them is usually the user interface, research tools, and customer service quality. If you are new to investing, a simple, well-designed app matters more than advanced features you will not use.

Placing your first order

Once money is in your account, you search for a stock by its ticker symbol (a one- to five-letter code — Apple is AAPL, Microsoft is MSFT). The brokerage shows you the current price, recent price history, and basic information about the company. You then decide how many shares to buy.

You place an order by selecting the number of shares and choosing an order type. A market order buys immediately at whatever price the stock is trading at right now. A limit order lets you set a maximum price you will pay — if the stock is at $150 and you set a limit of $145, the order only executes if the price drops to $145 or below. Limit orders can sit unfilled if the price never reaches your target.

Orders execute only during market hours: 9:30 a.m. to 4 p.m. Eastern time, Monday through Friday (the market is closed on weekends and federal holidays). If you place an order after 4 p.m., it waits until the market opens the next day. Some brokerages offer extended-hours trading before 9:30 a.m. and after 4 p.m., but prices are less stable and spreads are wider during those times.

Understanding costs and the bid-ask spread

Most brokerages charge zero commission per trade, meaning you do not pay a flat fee to buy or sell. However, every stock has a bid-ask spread — the gap between the price someone will pay to buy (the bid) and the price someone will sell for (the ask). If a stock's bid is $100 and the ask is $100.10, you pay the $100.10 when you buy and receive $100 when you sell. That $0.10 difference is the spread, and it goes to market makers, not the brokerage.

Spreads are tighter (smaller) for popular, heavily traded stocks like Apple or Microsoft, and wider for smaller or less-traded companies. A stock trading millions of shares per day might have a spread of one cent; a stock trading thousands might have a spread of 50 cents or more. Over time, spreads add up, especially if you trade frequently.

You also pay taxes when you sell at a profit. If you hold a share for less than one year before selling, the profit is taxed as ordinary income (at your regular tax rate). If you hold for one year or more, the profit is taxed as a long-term capital gain, which is usually lower. Losses can offset gains, reducing your tax bill.

Reducing risk through diversification

Buying a single share in a single company is risky. If that company fails or its stock crashes, you lose most or all of your money. Diversification means spreading your money across many different stocks, industries, and company sizes so that one bad performer does not wipe you out.

You can diversify by buying individual shares in 20 or 30 different companies, but that requires research and time. A simpler route is to buy shares in an index fund or exchange-traded fund (ETF) — a single share that holds hundreds or thousands of other stocks inside it. An S&P 500 index fund, for example, holds shares in 500 large U.S. companies. You buy one share and instantly own a piece of all 500.

Index funds and ETFs charge a small annual fee (often 0.03% to 0.20% per year), but they eliminate the work of picking individual stocks and the risk of betting everything on one company. For most people starting out, buying index fund shares is safer and simpler than picking individual stocks.

What happens after you buy

Once you own shares, they sit in your brokerage account. You can watch the price change throughout each trading day. You do not have to do anything — you can hold for years. If the company pays a dividend, the cash lands in your account automatically, and you can reinvest it to buy more shares or withdraw it.

You can sell your shares anytime the market is open by placing a sell order the same way you placed a buy order. The money from the sale lands in your brokerage account within two business days (this is called the settlement period). You can then withdraw that money to your bank account or use it to buy other shares.

Your brokerage sends you a tax form (Form 1099-B) at the end of each year showing all your trades and gains or losses. You use this to file your taxes. If you hold shares in a retirement account like a 401(k) or IRA, the tax rules are different — gains are not taxed until you withdraw the money, and in some cases not at all.

Common mistakes to avoid

Trying to time the market — buying before prices rise and selling before they fall — is nearly impossible, even for professionals. Most people who trade frequently end up with lower returns than people who buy and hold. The bid-ask spread and taxes eat into profits from frequent trading.

Buying based on tips from friends, social media, or financial personalities often leads to losses. These sources rarely have better information than the market already knows, and they do not know your personal situation. Stocks that are heavily promoted online are often already overpriced.

Putting all your money into one stock or one sector (like technology or cryptocurrency) concentrates risk. If that sector falls out of favor, your entire portfolio suffers. Spreading money across many stocks and asset types protects you from any single bad bet.

Panic selling during market downturns locks in losses. Stock prices fall regularly — sometimes 10%, sometimes 20% or more — but historically they recover. People who sell during crashes miss the recovery. If you cannot stomach a 30% drop without selling, you should hold more conservative investments like bonds or index funds with lower volatility.

Frequently Asked Questions

How much money do I need to start buying shares?

Most brokerages have no minimum deposit, so you can open an account with $1. However, buying individual shares can be expensive — if a stock costs $200 per share, you need $200 to buy one. Many brokerages now offer fractional shares, letting you buy a portion of an expensive stock with less money. Index funds and ETFs are often cheaper per share and let you diversify with a small amount.

Can I lose more money than I invested?

If you buy shares outright (without borrowing), the most you can lose is what you paid. If a stock goes to zero, you lose 100% of that investment, but you do not owe money beyond that. If you borrow money from your brokerage to buy shares (called margin), you can lose more than your initial investment and owe the brokerage the difference.

What is the difference between stocks and bonds?

A stock is ownership in a company; a bond is a loan you make to a company or government. When you own a stock, you profit if the company does well and lose if it does poorly. When you own a bond, you receive a fixed interest payment regardless of how the company performs, but you do not own part of it. Bonds are generally less risky but offer lower returns.

Should I pick individual stocks or buy index funds?

Most people, especially beginners, do better with index funds or diversified ETFs. Individual stock picking requires research, time, and emotional discipline. Studies show that even professional stock pickers rarely beat the market over long periods. Index funds are simpler, cheaper, and historically outperform most active traders.

When should I sell a share I own?

Sell when your personal situation changes (you need the money), when your reason for buying no longer holds true, or when you want to rebalance your portfolio. Do not sell based on short-term price swings or fear that the market will crash. If you are holding a diversified portfolio for the long term, selling during downturns usually hurts your returns.