Market capitalisation refers to the total pound market value of a company’s outstanding shares. Commonly referred to as “market cap,” it is calculated by multiplying a company’s shares outstanding by the current market price of one share. The investment community uses this figure to determine a company’s size, as opposed to using sales or total asset figures.

Using market capitalisation to show the size of a company is important because company size is a basic determinant of various characteristics in which investors are interested, including risk. It is also easy to calculate. A company with 20 million shares selling at £100 a share would have a market cap of £2 billion.

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