What Is a Stock? (And Why You Probably Own Some Already)

Larry "Big Short" Burry BEARISH

Senior Doomer Analyst

"Former death metal drummer turned market doomsayer. Predicts crashes using tea leaves and charts. His glass eye sees the future, and it's always red."

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Quiz included Test what you learned at the end of this article.

When Apple’s stock price goes up, Tim Cook doesn’t get richer from your work. You do — if you own Apple stock. That’s the whole concept.

A stock (also called a share or equity) is a unit of ownership in a company. When a company issues stock, it’s dividing itself into millions of tiny pieces and selling those pieces to the public to raise money. When you buy one, you own a fraction of that company.

It’s that simple. The complexity came later, invented by people who needed to justify their fees.

Why Do Companies Issue Stock?

A company needs money to grow. It has two options:

Borrow it (take loans or issue bonds — debt)
Sell ownership (issue stock — equity)

Selling stock lets a company raise enormous amounts of capital without paying it back. The tradeoff: original owners give up a slice of their company and future profits.

When Apple went public in 1980, it raised $100 million. Today, Apple is worth over $3 trillion. The people who bought Apple’s IPO stock and held it are spectacularly wealthy. The people who bought it in 1980 and sold in 1985 are significantly less so.

Larry’s Reality Check

If you have a pension fund, a 401k, a work savings plan, or even a savings account at certain banks — you almost certainly own stocks already. About 58% of Americans own stock either directly or indirectly through retirement accounts. The question isn’t whether you should be involved in stocks. You probably already are. The question is whether you understand what you own.

How Do You Make Money From Stocks?

Two ways:

1. Capital appreciation (price goes up) You buy at $100, sell at $150. You made $50. Simple.

The price goes up when the company is growing, profitable, or expected to be. It goes down when the opposite is true — or when people panic.

2. Dividends (company pays you) Some companies share profits directly with shareholders as cash payments (dividends). If you own 100 shares of a company paying a $2 annual dividend, you receive $200/year just for holding.

Not all companies pay dividends. Growth companies (like Amazon historically) reinvest profits instead of paying them out, betting the reinvestment creates more value. Both models work.

What Determines a Stock’s Price?

Ultimately: supply and demand. More buyers than sellers → price rises. More sellers than buyers → price falls.

What drives that? In theory: the company’s future earnings potential. In practice: also fear, greed, news headlines, interest rates, geopolitics, and occasionally Elon Musk tweeting at 3am.

This is why stock prices are volatile in the short term. In the long term, prices generally track earnings growth.

Individual Stocks vs Index Funds

Owning one company’s stock is a concentrated bet. If the company fails, you lose it all. Enron, Lehman Brothers, and Bed Bath & Beyond shareholders can confirm this.

Owning an index fund spreads your bet across 500 companies simultaneously. Even if 10 companies fail, the other 490 keep growing.

For most people, index funds are the smarter choice. Individual stocks are for people who do significant research, understand a company deeply, and can handle concentrated risk.

Frequently Asked Questions (FAQ)

What is the difference between common stock and preferred stock?

Common stock is what most people buy — it includes voting rights and higher upside potential, but dividends aren’t guaranteed and common shareholders are last in line if a company goes bankrupt. Preferred stock typically pays fixed dividends and has priority over common stock in bankruptcy, but with limited upside. For beginners, common stock (via index funds) is what you’re dealing with.

Can I lose more than I invest in stocks?

If you buy stocks normally (not on margin/leverage), your maximum loss is 100% of what you invested. The stock goes to zero, you lose your investment. You cannot lose more than you put in. This changes if you use margin (borrowed money) or options — both of which are not for beginners, and even most experts avoid them.

How much money do I need to start buying stocks?

Modern brokers offer fractional shares — meaning you can buy $5 worth of Amazon, $10 worth of Apple, or $50 into a Vanguard ETF. There is no minimum. The “you need lots of money to start” myth is exactly that: a myth. The only thing you need before investing is a fully funded emergency fund.

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