Small-Cap company is a company whose market capitalization (shares x value of each share) is between $300 million and $2 billion.
Mid cap stocks are shares of companies with market capitalizations between $2 billion and $10 billion.
Large-cap stocks are shares of a company with a market capitalization of more than $10 billion. They are also referred to as blue chip stocks. Well-known companies such as Microsoft, Apple, Johnson & Johnson and Walmart are some examples of large cap companies.