What Is a Stock?

When a company wants to raise money, one way to do it is to sell pieces of itself to outside investors. Each piece is called a share of stock, or equity. The company divides itself into millions or billions of shares, sells some portion of them to raise capital, and the buyers become part-owners. Shareholders do not run the company day to day, but they do own a slice of it. That ownership comes with specific legal rights: a proportional claim on the company's assets if it ever winds down, and a proportional claim on earnings that the company chooses to distribute.

Owning one share of a company that has issued 10 billion shares gives you one 10-billionth of the company. That is a small fraction, but it is a real one. If the company's total value doubles, your share is worth twice as much. If the company goes bankrupt, your share can go to zero. The upside and the downside both scale with your ownership stake, and neither outcome is guaranteed.

The price of a stock on any given day reflects what buyers and sellers currently agree it is worth, based on their collective views about the company's future earnings, competitive position, management quality, and dozens of other factors. The underlying value of the business and the price you pay for a share can diverge significantly, sometimes for years. A stock priced at $50 is not necessarily worth $50. It is simply the price at which the most recent willing buyer and seller completed a transaction.

The first time a private company sells shares to the public, it is called an initial public offering, or IPO. The company works with investment banks to set a price and sell shares to institutional and individual investors. The proceeds go to the company, which uses them for operations, expansion, or debt repayment. Once the shares are sold, they start trading on a stock exchange, and the company receives no additional money from those secondary transactions.

After the IPO, a company can issue additional shares through a secondary offering. This raises more capital but dilutes existing shareholders: if a company doubles its share count, each existing share now represents half the ownership it did before. Dilution reduces the value of each share all else being equal, which is why secondary offerings often cause a stock price to drop. Companies also sometimes buy back their own shares from the market, which has the opposite effect.

Most of the stocks that ordinary investors buy and sell are shares that have been trading publicly for years or decades. The IPO price and what happened right after the company went public is history. What matters to an investor today is what the company is worth now, what it might be worth in the future, and whether the current stock price reflects that accurately. Those questions have no reliable, consistent answers. That is the core reason investing involves risk.

Price appreciation is the most visible way a stock creates value. If you buy a share at $40 and sell it at $60, you have a $20 gain. The price went up because other investors became willing to pay more for the same ownership stake, usually because the company's earnings grew, its competitive position strengthened, or the market simply got more optimistic about its future. The same mechanism runs in reverse. If earnings disappoint, competition intensifies, or confidence falls, the price drops. Stocks can and do go to zero. A company can fail entirely, taking all shareholder value with it.

Dividends are cash payments some companies make to shareholders, usually quarterly. A company that earns more than it reinvests may distribute a portion of that profit directly to owners. If you own 100 shares and the company pays $1 per share per year, you receive $100 in dividends annually. That cash is yours regardless of what the stock price does on any given day.

The critical thing to understand about dividends is that they are not guaranteed. A company's board of directors votes on dividend payments. If business conditions deteriorate, if the company needs cash for its own operations, or if the board simply decides to use earnings differently, dividends can be cut or eliminated entirely. Companies that have paid dividends for decades have still cut them during financial stress. The history of a dividend does not bind the future. Any portfolio strategy that depends on dividends for income must account for the real possibility that those payments will be reduced or stop.

Both sources of return, price gains and dividends, carry the same fundamental risk: the underlying company may perform worse than expected. A company with a long dividend history can fail. A stock that has risen for years can fall just as far. The two ways stocks make money are also the two ways stocks lose it.

A stock exchange is an organized marketplace where buyers and sellers transact in shares of publicly listed companies. The two largest in the United States are the New York Stock Exchange (NYSE) and Nasdaq. Both operate primarily during regular market hours, 9:30 a.m. to 4:00 p.m. Eastern time on weekdays, excluding holidays. Pre-market and after-hours trading exists at most brokerages, but liquidity is thinner outside regular hours, and prices can be more volatile and harder to execute reliably.

When you place an order to buy a stock, you are matched with a seller who has placed an order to sell at that price, or close to it. The price you see quoted is typically the last transaction price. The bid is the highest price a buyer is currently willing to pay. The ask is the lowest price a seller is currently willing to accept. The gap between them is the spread. For actively traded stocks, the spread is often a penny or less. For thinly traded ones, it can be much wider, which means you may buy at a meaningfully higher price than the current quote and sell at a meaningfully lower one.

Market orders execute immediately at the best available price. Limit orders execute only at your specified price or better, which gives you control over the price but not the timing. An order placed at a limit price that the market never reaches will not execute. For most investors holding for years, the difference between executing a trade at $49.95 versus $50.05 matters far less than the quality of the underlying business and whether the overall price paid reflects reasonable value.

An index fund or ETF (exchange-traded fund) bundles many stocks together into a single investment. A broad U.S. market index fund might hold shares in 500 or more companies simultaneously. When you buy one share of that fund, you indirectly own a small piece of all of them. The fund's price rises and falls with the collective performance of its holdings. No single company failing can destroy the fund: if one company in a 500-stock index collapses entirely, the impact on the fund is roughly one-five-hundredth of that loss.

Individual stocks work differently. When you own shares in one company, your outcome depends entirely on that one company. If it does well, you benefit fully. If it fails, the position goes to zero. Holding a small number of individual stocks concentrates risk in a way that a broad fund does not. The same concentration can produce better returns if the companies selected perform well and worse returns if they do not. There is no structural guarantee either way.

Index funds and ETFs typically carry lower costs and broader diversification. Individual stock portfolios involve more research, more volatility at the position level, and a higher chance of underperforming a broad market index over any given period. Studies consistently show that most actively managed stock portfolios trail the index over long periods, especially after fees. That does not mean individual stock investing is wrong. It means the bar for it to make sense is higher than simply picking companies that seem familiar or popular.

At Narstar, we use individual stocks in all three model portfolios, not funds. The Income portfolio holds dividend-paying companies selected for cash flow. The Growth portfolio holds companies with durable competitive advantages. The Speculative portfolio holds a small number of concentrated positions in smaller companies with higher risk. Clients are matched to one portfolio or a combination based on goals and tolerance for loss, not balance size. If you want broad, low-cost index exposure instead, a robo-advisor or a self-directed brokerage account with index ETFs may be a better fit. The robo-advisor vs. fee-only adviser article covers that comparison directly.

All three Narstar portfolios are built from individual stocks, not funds. Each portfolio has a specific purpose, a specific fee, and a specific risk level. After you reach out, we send a short questionnaire about your goals, timeline, and how you would react to a significant loss. Based on your answers, you are matched to one of the three or a combination. We manage it with discretionary authority, which means we make trade decisions without asking you first on each one. You can see everything in your account at Interactive Brokers, where assets are protected by SIPC (opens in new tab) coverage (up to $500,000, with $30 million in excess coverage through IBKR). SIPC protects against broker failure, not investment losses.

The Income portfolio (0.60%/year) holds dividend-paying stocks selected for cash flow. Dividends are not guaranteed, and interest rate changes or sector downturns can affect the portfolio significantly. The Growth portfolio (1.20%/year) holds companies selected for durable competitive advantages, held with a long-term view. Individual holdings can still decline sharply, and the portfolio can underperform broad market indices for extended periods. The Speculative portfolio (1.60%/year) is concentrated in a small number of smaller companies. It carries the highest risk of the three, including the real possibility of sharp losses. It is not appropriate for most investors.

All three portfolios carry real risk. Stocks can fall. Companies can fail. The portfolios are not guaranteed to produce any particular outcome, and past portfolio decisions do not predict future results. The minimum account size is $100.

Narstar manages three model portfolios (Income, Growth, and Speculative), each with a different approach to risk. The homepage shows the dollar cost at any account balance.