What Is a Stock?

A company that wants to raise money can sell pieces of itself to outside investors. Each piece is called a share of stock (or equity). The company carves itself into millions or billions of shares, sells some portion to raise capital, and the buyers become part-owners. Shareholders don't run the company day to day. But they do own a slice of it, and 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 any earnings the company chooses to distribute.

One share of a company that has issued 10 billion shares gives you one 10-billionth of the company. Tiny. But real. If the company's total value doubles, your share is worth twice as much. Goes bankrupt? Your share can go to zero. The upside and the downside both scale with your ownership stake, and neither outcome is guaranteed.

So what determines a stock's price on any given day? Whatever buyers and sellers currently agree it's worth, based on their collective views about future earnings, competitive position, management quality, and dozens of other factors. Here's the part most people miss: 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 isn't necessarily worth $50. It's the price at which the most recent willing buyer and seller completed a transaction. Nothing more.

The first time a private company sells shares to the public 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. Proceeds go to the company for operations, expansion, or debt repayment. Once the shares are sold, they start trading on a stock exchange. After that point, the company doesn't receive any more money from those trades. Investors are just buying from and selling to each other.

A company can also issue additional shares after the IPO through a secondary offering. More capital comes in, but existing shareholders get diluted: double the share count and each existing share represents half the ownership it did before. That's why secondary offerings often cause a stock price to drop. The reverse exists too. Companies sometimes buy back their own shares from the open market, which reduces the share count and concentrates ownership among fewer holders.

Most stocks ordinary investors buy and sell have been trading publicly for years or decades. The IPO price is history. What matters 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. Nobody can answer those questions consistently. That's the core reason investing involves risk.

Price appreciation is the most visible one. Buy a share at $40, sell it at $60, and you have a $20 gain. The price went up because other investors became willing to pay more for the same ownership stake. Maybe earnings grew. Maybe the competitive position strengthened. Maybe the market just got more optimistic. The same mechanism runs in reverse: earnings disappoint, competition intensifies, confidence falls, and the price drops. And 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. Own 100 shares of a company that pays $1 per share per year and 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. Business deteriorates, the company needs cash for operations, or the board decides to use earnings differently, and dividends get cut or eliminated entirely. Companies that have paid dividends for decades have still cut them during financial stress. The history of a dividend doesn't bind the future. Worth knowing: 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 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 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. Prices can be more volatile, and trades harder to execute at the price you expect.

Place an order to buy a stock and you get matched with a seller at that price, or close to it. The price you see quoted is the last transaction price. Two other numbers matter: the bid (highest price a buyer is currently willing to pay) and the ask (lowest price a seller will accept). The gap between them is called the spread. For actively traded stocks, the spread is often a penny or less. For thinly traded ones, it can be much wider. That means you might 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. Set a limit price the market never reaches and the order just sits there. Does any of this matter for a long-term investor? Not much. 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 at once. Buy one share of that fund and you indirectly own a small piece of all of them. The fund's price rises and falls with the collective performance of its holdings. If one company in a 500-stock index collapses entirely, the impact on the fund is roughly one-five-hundredth of that loss. No single company failing can destroy it.

Individual stocks are a different animal. Own shares in one company and your outcome rides on that company alone. Does well? You get the full upside. Fails? Zero. Holding a small number of individual stocks concentrates risk in a way a broad fund doesn't. That same concentration can produce stronger results if the companies selected perform well, and worse results if they don't. No structural guarantee either way.

Index funds and ETFs 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 doesn't mean individual stock investing is wrong. But 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. But if broad, low-cost index exposure is what you want, a robo-advisor or a self-directed brokerage account with index ETFs is likely the 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 has a specific purpose, a specific fee, and a specific risk level. You reach out, we send a short questionnaire about your goals, timeline, and how you'd react to a significant loss. Based on your answers, you're matched to one of the three or a combination. We manage it with discretionary authority: we make trade decisions without asking you first on each one. Everything lives 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. Highest risk of the three, including the real possibility of sharp losses. It's not appropriate for most investors.

All three portfolios carry real risk. Stocks can fall. Companies can fail. The portfolios aren't guaranteed to produce any particular outcome, and past portfolio decisions don't predict future results. Minimum account size is $100.

Want to see what it costs? The homepage fee calculator shows the dollar amount at any account balance.