What is a Market Cap?

Market cap short for market capitalisation is the total value the stock market places on a company. It is calculated by multiplying the current share price by the total number of shares that exist.

If a company has 10 million shares and each share trades at $50, its market cap is $500 million.

Why does market cap matter?

It tells you the size of a company at a glance. A company with a market cap of $500 million is a very different investment from one worth $500 billion. Different risks, different growth potential, different stability.

How are companies categorised?

Investors typically group companies into three broad categories. Large-cap companies are worth over $10 billion. These tend to be well-established businesses with stable earnings. Mid-cap companies fall between $2 billion and $10 billion. Small-cap companies are worth under $2 billion and tend to be younger, faster-growing, and more volatile.

Is a higher market cap always better?

Not necessarily. A very large company may have less room to grow. A small company might grow quickly but carry more risk. Market cap is a starting point, not a verdict on quality.

What market cap does not tell you

Market cap reflects what the market is willing to pay today. It does not tell you whether a company is profitable, how much debt it carries, or whether its stock is fairly priced. It is a useful tool, but always one piece of a larger picture.