Small-, mid- and large-cap stocks are ways to categorize market capitalization, which is the total value of all the shares of a company’s stock. Very large companies like Apple and Alphabet (the holding company for Google) are considered large-cap stocks with market capitalizations starting at $10 billion. Stocks from relatively smaller companies are considered mid-cap or small-cap depending on how much all of the stocks they are issued are worth. Market capitalization for mid-cap stocks tends to be between $2 billion and $10 billion and for small-cap stocks between $300 million and $2 billion. As stock prices go up and down over time, market capitalization ranges and whether a stock is considered small-, mid- or large-cap changes over time as well.