Definition of 'Market Capitalization'
The total dollar market value of all of a company's outstanding shares. Market capitalization 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 sales or total asset figures.
Frequently referred to as "market cap."
Investopedia explains 'Market Capitalization'
If a company has 35 million shares outstanding, each with a market value of $100, the company's market capitalization is $3.5 billion (35,000,000 x $100 per share).
Company size is a basic determinant of asset allocation and risk-return parameters for stocks and stock mutual funds. The term should not be confused with a company's "capitalization," which is a financial statement term that refers to the sum of a company's shareholders' equity plus long-term debt.
The stocks of large, medium and small companies are referred to as large-cap, mid-cap, and small-cap, respectively. Investment professionals differ on their exact definitions, but the current approximate categories of market capitalization are:
Large Cap: $10 billion plus and include the companies with the largest market capitalization.
Mid Cap: $2 billion to $10 billion
Small Cap: Less than $2 billion
In order to make an investment decision, you may need to factor in the market cap of some investments. Read Understanding Small- And Big-Cap Stocks.