This is the total value of a company’s stock, calculated by multiplying the number of outstanding shares by the current market price of a share.

Companies with less than $1 billion of market capitalization are generally regarded as small cap companies.  Large cap companies usually have at least $8 billion of market cap.  Market Cap is also called "market capitalization" or just "capitalization."  The formula for determining the market capitalization is the following:  Current Stock Price x Shares Outstanding = Market Capitalization.