In plain words: The total market value of a company's outstanding shares of stock.
Market capitalization, often shortened to market cap, measures the total value the market places on a company. It is calculated by multiplying the current share price by the number of shares outstanding. The figure offers a quick sense of a company's size and is widely used to group businesses into large, medium, and small categories.
How is market capitalization calculated?
The formula is straightforward: share price multiplied by the total number of shares in issue. Because the share price moves constantly, market cap changes throughout each trading day. It reflects what investors collectively believe a company is worth at a given moment, not the value of its physical assets or its cash.
Why do investors group companies by size?
Sorting companies by market cap helps describe their risk and behaviour. Larger companies are often seen as more stable, while smaller ones may grow faster but swing more in price. Broad global equities exposure within a diversified portfolio typically spans many sizes rather than concentrating in one, supporting diversification.
Key takeaways
- Market cap is share price multiplied by shares outstanding.
- It gives a quick read on a company's overall size.
- Size categories help describe risk and expected behaviour.