Stock Market Basics

Learning Objectives

By the end of this module, you will be able to:

Understand what the stock market is and why it exists.
Learn why companies list on the Australian Securities Exchange (ASX).
Understand why investors buy shares, and what owning one actually gives you.
Explain how an order reaches the market, and who regulates it.
Name the main asset classes available to Australian investors.
Read a stock quote and follow ASX commentary without stopping at unfamiliar terms.
Understand how the stock market supports Australia's economy.

What is the Stock Market?

Imagine your favourite local café wants to open ten more stores across Australia.

Opening new stores costs money. The owners have two choices:

Borrow money from a bank.
Sell part ownership of the business to investors.

Many successful businesses choose the second option.

They divide their company into thousands or millions of small ownership pieces called shares. These shares are then offered to investors through the stock market.

The stock market is simply a place where buyers and sellers trade these ownership pieces.

In Australia, the main stock exchange is the Australian Securities Exchange (ASX).

When you buy shares, you become a part-owner of that company.

Even if you just own one share, you own a small part of the business.

What is the ASX?

The Australian Securities Exchange (ASX) is Australia's primary securities exchange.

It provides a secure and regulated marketplace where investors can buy and sell shares in publicly listed companies.

Thousands of companies are listed on the ASX, ranging from Australia's largest businesses to small emerging companies.

Some well-known ASX-listed companies include:

Commonwealth Bank (CBA)
BHP Group (BHP)
CSL Limited (CSL)
Woolworths Group (WOW)
Wesfarmers (WES)

The ASX also lists Exchange Traded Funds (ETFs), Real Estate Investment Trusts (REITs), bonds, and other investment products.

Why Do Companies List on the Stock Market?

Companies usually list because they want to raise money to grow.

That money can be used for:

Expanding operations
Developing new products
Hiring employees
Buying equipment
Entering international markets
Paying down debt

Instead of borrowing from a bank, companies raise capital by selling shares to investors.

This process is called an Initial Public Offering (IPO).

Why Do People Buy Shares?

People invest in shares for different reasons.

1. Capital Growth

If a company's value increases over time, its share price may also rise.

If you bought shares at $10 and later sold them at $15, your capital gain would be $5 per share.

2. Dividend Income

Some companies share a portion of their profits with shareholders.

These payments are called dividends.

Not every company pays dividends, but many established Australian companies do.

3. Building Long-Term Wealth

Many Australians invest regularly to build wealth over many years.

Rather than trying to get rich quickly, long-term investors often focus on quality businesses and allow their investments time to grow.

What Happens When You Buy a Share?

When you purchase a share:

You become a shareholder.
You own a small portion of that company.
Your investment may increase or decrease in value.
You may receive dividends if the company pays them.
You may have voting rights on certain company matters.

However, owning shares does not mean you manage the company.

Management continues to make day-to-day business decisions.

Two Markets, Not One

People talk about "the market" as a single thing, but it really has two distinct halves.

The primary market is where a company issues new shares for the first time, usually through an Initial Public Offering. The money raised goes to the company, and it uses that capital to grow the business.

The secondary market is where those shares change hands afterwards. When you buy BHP shares today, you are buying them from another investor, not from BHP. The company receives nothing from that trade.

Almost all day-to-day trading you will do as an investor happens in the secondary market.

How an Order Reaches the Market

You cannot walk onto the exchange floor and buy shares yourself. Orders reach the ASX through a broker.

You place an order with your broker, usually through an online trading platform.
The broker submits the order to the ASX trading system on your behalf.
The system matches your order against a matching order on the other side.
Once matched, the trade is confirmed and later settled.

The whole process usually takes a fraction of a second, though the shares and cash formally change hands two business days later. This is known as T+2 settlement.

Market Orders and Limit Orders

A market order buys or sells immediately at the best price currently available. It prioritises certainty of execution over certainty of price, which matters most in fast-moving or thinly traded stocks.

A limit order sets the price you are willing to accept. A buy limit at $10.00 will not fill above $10.00. It prioritises price over execution, and it may never fill at all if the market does not reach your price.

Most long-term investors use limit orders for anything other than the largest and most liquid stocks.

Bid, Ask, and the Spread

At any moment, a listed stock has two prices showing.

The bid is the highest price a buyer is currently willing to pay.
The ask (or offer) is the lowest price a seller is currently willing to accept.

The gap between them is the spread. A large, heavily traded company might have a spread of one cent. A small company that trades rarely might have a spread of several cents or more, which is a real cost to you every time you trade. A wide spread is one of the clearest signs that a stock is illiquid.

Who Keeps the Market Honest?

Three parties matter here, and they do different jobs.

The ASX operates the exchange, sets its listing rules, and decides which companies may list and remain listed.
ASIC — the Australian Securities and Investments Commission — is the regulator. It supervises market conduct and enforces the law against insider trading and market manipulation.
Your broker must be licensed, and is required to handle your orders and your money according to strict rules.

Listed companies also carry continuous disclosure obligations: they must tell the market promptly about anything that could reasonably affect their share price. This is what keeps information reaching all investors at roughly the same time.

The ASX runs a normal trading session on business days, between 10:00am and 4:00pm Sydney time. The open and the close are handled by short auction periods rather than continuous trading, which is why prices can move sharply in the first and last few minutes of the day.

The Main Asset Classes

Almost every investment falls into one of a handful of groups, called asset classes. Each behaves differently, and that difference is precisely what makes a diversified portfolio work.

Cash

Savings accounts and term deposits. Your capital is stable and access is easy, but returns are low and inflation erodes purchasing power over long periods. Cash is where you hold money you may need soon.

Bonds and Fixed Income

A bond is a loan you make to a government or a company. In return you receive regular interest and, at maturity, your capital back. Bonds are generally steadier than shares, and government bonds are steadier than corporate ones. Their prices still move, particularly when interest rates change.

Part ownership of a business. Historically shares have delivered the highest long-term returns of the major asset classes, and they have also delivered the largest falls along the way. Both facts are part of the same package.

Property

Direct property means buying a building — a large, illiquid commitment. Listed property, through REITs, gives you exposure to commercial property with far less capital and the ability to sell on any trading day.

Pooled Investments

Most investors do not build a portfolio one company at a time. Pooled products let many investors buy a single diversified holding.

Exchange Traded Funds (ETFs) trade on the ASX like ordinary shares, but each unit represents a basket of investments. Most track an index, such as the S&P/ASX 200, so one trade gives you a slice of two hundred companies.
Managed funds pool investors' money for a professional manager to invest. They are bought from the fund rather than on the exchange, priced once a day, and usually charge higher fees.
Listed Investment Companies (LICs) are ASX-listed companies whose business is holding a portfolio. Their share price can sit above or below the value of the assets they hold.

Some listed products need more care: derivatives such as options can expire worthless, leveraged products magnify losses as well as gains, and speculative small caps may have no revenue at all. None are inherently bad — they simply require knowledge this module is designed to start building.

Matching Investments to Time Frames

The right mix depends far more on when you need the money than on which product looks most attractive today.

Under two years: cash and term deposits, where capital stability matters most.
Two to five years: a blend, typically weighted towards fixed income.
Five years and beyond: a higher allocation to shares and property, where time absorbs volatility.

Reading a Stock Quote

Every listed company has a short ticker code — CBA for Commonwealth Bank, BHP for BHP Group.

Alongside the code you will usually see:

Last price: the price of the most recent trade.
Change: the move since the previous close, in cents and as a percentage.
Volume: how many shares have traded so far today.
Day range and 52-week range: the highest and lowest prices traded today, and over the past year.

Volume deserves more attention than it usually gets. A large price move on very small volume tells you much less than a modest move on heavy volume.

Market capitalisation is the total value of a company's shares on issue: the share price multiplied by the number of shares. Share price alone says nothing about company size — a $2 share can belong to a far larger business than a $50 share.

Dividend Terms

Dividends come with their own vocabulary, and the dates matter.

Dividend per share: the cash amount paid on each share.
Dividend yield: the annual dividend as a percentage of the share price. A $1.00 dividend on a $20.00 share is a 5% yield.
Payout ratio: the share of profit paid out as dividends. A very high ratio may not be sustainable.
Ex-dividend date: the first day on which a buyer is not entitled to the declared dividend. Buy on or after this date and the dividend goes to the seller.
Franking credit: a credit for company tax already paid, attached to many Australian dividends.

A share price commonly falls by roughly the dividend amount on the ex-dividend date. That is expected mechanics, not bad news.

Market Language

Finally, the words that appear in daily commentary.

Bull market: a sustained period of rising prices. Bear market: a sustained fall, conventionally 20% or more.
Correction: a fall of roughly 10% from a recent high.
Volatility: how sharply prices swing, in either direction.
Liquidity: how easily you can trade without moving the price.
Index: a basket tracking a section of the market, such as the S&P/ASX 200.
EPS and P/E ratio: earnings per share, and the share price divided by those earnings.

How Does the Stock Market Help the Economy?

The stock market benefits both businesses and investors.

For Companies

Access to growth capital
Increased public visibility
Ability to fund expansion

For Investors

Opportunity to build wealth
Potential dividend income
Portfolio diversification

For Australia

The stock market supports economic growth by helping businesses raise capital, create jobs, develop new products, and invest in innovation.

Important Things to Remember

The stock market is not a guaranteed way to make money.

Share prices move up and down every day due to many factors, including:

Company performance
Economic conditions
Interest rates
Inflation
Investor sentiment
Global events

Investing always involves risk, which is why learning the fundamentals is an important first step.

Key Takeaways

A share represents partial ownership in a company.
The ASX is Australia's primary stock exchange, and companies list on it to raise capital.
Investors buy shares for potential capital growth and dividend income.
The primary market raises money for companies; the secondary market is where investors trade with each other.
Market orders prioritise execution, limit orders prioritise price, and the bid-ask spread is a real cost.
The ASX runs the market, ASIC regulates it, and continuous disclosure keeps investors informed.
The main asset classes are cash, fixed income, shares, and property; your time frame should drive the mix.
Share prices can rise or fall, and investing carries risk.