What a Stock Is and How an Investor Can Make Money From It

When people say “I own Apple” or “I own ČEZ,” they usually do not mean they own the entire company. They mean they own shares — small pieces of ownership in that company.

A stock is one of the most important concepts in investing. At first, however, it can feel abstract: on a screen, you see a ticker, a price, and a chart. Behind that chart, there is a real company, employees, products, customers, profits, and risks.

The goal of this article is to answer a simple question: What does an investor actually own when they own a stock?

The examples in this article are educational and illustrative only. They are not a recommendation to buy or sell any security.

A Stock as a Small Piece of a Company

Imagine a company as a large cake. The cake is cut into many small pieces. Each piece is one share.

When an investor owns a share, they own a small stake in the company. In large companies, that stake is extremely small, but the principle is the same as ownership:

• the company owns assets,
• it sells products or services,
• it may generate profit,
• it may pay part of that profit to shareholders,
• its value changes over time.

So a shareholder is not just “betting on a chart.” A shareholder is a part-owner of a business, even if often a very small one.

Shares of public companies such as Apple (AAPL), Microsoft (MSFT), Coca-Cola (KO), NVIDIA (NVDA), or ČEZ are traded on stock exchanges. This means different investors can acquire and transfer them under the rules of that market.

What a Ticker Is

Every publicly traded stock has an abbreviation called a ticker. It is similar to a license plate on a car.

For example:

Company	Ticker	Example exchange
Apple	AAPL	NASDAQ
Microsoft	MSFT	NASDAQ
Coca-Cola	KO	NYSE
NVIDIA	NVDA	NASDAQ
ČEZ	CEZ / BAACEZ	Prague

A ticker helps quickly identify a specific stock in an app, chart, broker platform, or analytical tool.

How a Stock Price Is Created: Supply and Demand

A stock price is not “set by the company” every day. The price is created in the market based on what investors are willing to pay and accept.

In simple terms:

• demand = how many investors want to own the stock,
• supply = how many investors are willing to transfer it to others,
• market price = the point where buyers and sellers meet.

Imagine an auction. If many people want the same painting and there are only a few sellers, the price usually rises. If almost nobody wants the painting and many people want to sell it, the price usually falls.

Stocks work in a similar way, only much faster and digitally. On an exchange, orders from individuals, funds, banks, algorithms, and large institutions meet every second.

What a Stock Exchange Is: NYSE and NASDAQ

A stock exchange is an organized marketplace where securities, such as stocks, are traded. Its role is to provide rules, supervision, and technical infrastructure so that buyers and sellers can meet safely.

Some of the best-known exchanges are:

• NYSE – the New York Stock Exchange, one of the oldest and largest exchanges in the world,
• NASDAQ – a technology-focused U.S. exchange where many large technology companies trade,
• Prague Stock Exchange – the Czech market where, for example, ČEZ shares are traded.

The exchange itself does not decide whether a stock is “good” or “bad.” It is more like a marketplace. The quality of the goods depends on the specific company, and the price is created by how market participants value it.

Two Basic Sources of Return: Price Growth and Dividends

An investor can make money from a stock in two main ways:

1. Capital gain – the stock is sold at a higher price than the price at which it was acquired.
2. Dividend – the company pays part of its profit to shareholders.

Capital Gain

A capital gain happens when the value of the stock rises.

Example:

• AAPL stock was acquired at 180 USD,
• later its market price is 210 USD,
• the difference is 30 USD per share.

That is the capital gain before fees, taxes, and currency effects. If the price fell from 180 USD to 150 USD, it would instead represent a paper loss or a realized loss if sold.

The important point is that a capital gain is not guaranteed. The price can rise, stay flat, or fall.

Dividend

A dividend is part of the profit that a company decides to pay to shareholders. Not every company pays dividends.

For example, a technology company may say: “We prefer to use profits to develop new products.” Another stable company may regularly distribute part of its profit to shareholders.

A dividend is not free money. When a company pays out cash, that cash leaves the company’s account. The market usually reflects this in the stock price. Dividends can also change, be reduced, or be canceled.

Concrete Example: Apple as a Publicly Traded Company

Apple is a well-known company that sells iPhones, Macs, iPads, services, and other products. Its shares trade under the ticker AAPL on the NASDAQ exchange.

Let’s use a simplified illustrative example:

• Apple has approximately 15 billion shares,
• one share trades at 200 USD,
• the company’s market value is approximately 15 billion × 200 USD = 3 trillion USD.

If an investor owns 1 share of AAPL, they do not own a specific iPhone or a chair in Apple’s office. They own a very small stake in the entire company.

Return Example

Suppose an investor owns 5 shares of AAPL at a price of 200 USD each.

Item	Value
Number of shares	5
Acquisition price	200 USD
Total value at acquisition	1,000 USD
Later price	220 USD
Later value	1,100 USD
Capital gain before costs	100 USD

If the company also paid, for example, a dividend of 0.25 USD per share for the quarter, an investor with 5 shares would receive 1.25 USD before any applicable tax.

The total result can therefore have two parts:

• the change in the market price of the stock,
• the dividend received.

These parts differ from stock to stock. Some companies pay higher dividends, others pay none. Some grow faster but may carry higher risk.

Why Stock Prices Move Up and Down

A stock price changes because investors’ expectations change. A stock is not only a reflection of the company’s current situation, but also the market’s view of its future.

The price may be affected by factors such as:

• quarterly company results,
• revenue growth or decline,
• changes in profitability,
• new products,
• competition,
• interest rates,
• the state of the economy,
• market sentiment,
• political or regulatory risks,
• large purchases and sales by institutional investors.

Example: If Apple presents a product that investors consider highly successful, demand for the stock may rise. If the market starts to doubt future sales growth, the price may fall. Neither reaction is guaranteed — the market can sometimes react surprisingly.

A Stock Is Not a Lottery Ticket, but a Stake in a Business

Beginners often focus mainly on the chart: “Will it go up or down?” A better first question is: What kind of business is behind the stock?

For a stock, it is useful to understand:

• how the company makes money,
• whether it is growing,
• whether it is profitable,
• how much debt it has,
• whether it pays a dividend,
• how expensive it is relative to earnings,
• what risks may threaten it.

The chart shows the price. The company creates value. A thoughtful investor tries to understand both.

How to do this in QMA

QMA helps investors look at stocks not only as tickers, but as real companies with numbers, charts, and context.

In practice, these parts of the platform can be useful:

• /stocks/AAPL – the individual stock page shows price, chart, key financial metrics, valuation, dividend information, and historical development. It helps explain what stands behind the AAPL ticker.
• /screener – the screener helps compare companies using filters, such as company size, dividend yield, revenue growth, or profitability. It does not tell an investor what to do, but it speeds up the search for companies that match selected criteria.
• /portfolio – the portfolio view shows how individual positions contribute to the whole. In a model portfolio of 100,000 CZK, it can show how much weight one stock has and how a change in its price affects the total result.
• /journal – the investment journal is used to record why a stock was analyzed, what assumptions were used, and what later changed. It helps separate a plan from emotions.

Example use case: A user opens /stocks/AAPL, reviews how Apple makes money, how its price has developed, and whether the company pays a dividend. Then, in /portfolio, they can model how a 5% weight in one stock would affect the entire portfolio. The output is an analytical view, not an instruction to buy or sell.

Summary

A stock is an ownership stake in a company. Its price is created in the market through supply and demand. An investor can earn a return mainly in two ways: through stock price growth and dividends. Both sources of return are uncertain and depend on the development of the company and the market.

When an investor understands that they are not just dealing with a blinking number in an app, but with a small piece of a real business, they take the first major step toward more thoughtful investing.

Disclaimer

Past performance is not a guarantee of future results. All investment decisions are your own responsibility.