Understanding the Stock Market

A marketplace for business ownership

When you buy a stock, you become a part owner of a business. The stock market gives investors a place to buy and sell those ownership shares.

Understanding how that process works helps you use your brokerage account confidently and distinguish the business you own from the price quoted on your screen.

Where shares come from

There are two related markets.

The primary market

Companies issue new shares to raise money from investors. This can happen through an initial public offering, or IPO, and through later offerings.

The secondary market

Investors trade existing shares with one another. Most purchases you make through your brokerage account take place here. Your money generally goes to the seller, rather than directly to the company.

Buying shares on the stock market usually means buying an ownership stake from another investor.

How a stock trade works

For most individual investors, the process begins with a brokerage account.

1. Choose the investment

Confirm the company, ticker symbol, and security you intend to purchase. Similar company names or ticker symbols can lead to mistakes.

2. Enter an order

Specify the number of shares and the type of order. Review the details before submitting.

A market order seeks prompt execution at the best available price, but does not guarantee the price. A limit order sets the maximum you will pay to buy, or the minimum you will accept to sell, but may not execute.

3. The broker routes your order

Your broker sends the order to a trading venue. This may be an exchange, a market maker, or another trading system.

4. The trade executes

A buyer and seller transact at an agreed price. An order may execute in several parts, sometimes at different prices.

5. The trade settles

Cash and securities are delivered through the settlement process. Execution and settlement are separate stages of a trade.

The price you see before placing an order is not necessarily the price you receive. Prices can change while your order is being processed.

Choosing a brokerage

A brokerage provides access to investments, holds your account, and supplies tools for placing orders and reviewing your holdings.

Before opening an account, check:

• Whether it accepts residents of your country.
• Which investments and markets you can access.
• Trading, currency-conversion, transfer, and withdrawal fees.
• Funding and withdrawal methods.
• Account security and customer support.
• The legal entity holding your account and its investor protections.

For Cambodian residents, Interactive Brokers lists Cambodia among its available countries and territories as checked in October 2026. Account approval remains subject to its requirements.

Check current eligibility directly with the broker. Country availability does not guarantee that every applicant will qualify.

What SIPC protection means

For accounts held at a U.S. SIPC-member brokerage, the Securities Investor Protection Corporation helps recover missing customer securities and eligible cash when the brokerage fails.

Protection is generally limited to $500,000 per customer in each separate capacity, including a $250,000 limit for cash. Separate capacity refers to how an account is legally held. Opening multiple accounts of the same type does not automatically increase coverage.

SIPC protection addresses a shortfall in customer assets during a brokerage liquidation. It does not reimburse losses because your investments fall in value. It is different from bank deposit insurance.

For an international brokerage brand, verify the particular legal entity holding your account and the protection applicable to that entity.

Price is one piece of information

A stock quote tells you the price at which shares are trading. It does not, by itself, tell you whether the business is strong or whether the shares offer good value.

Your job as an investor is to connect the price with an understanding of the business. That is where the next lessons begin.

Further reading

These official resources provide more detail:

• Investor.gov: Executing an Order
• SIPC: What SIPC Protects
• Interactive Brokers: Available Countries and Territories