Quote from nazzdack:
Is this pretty enough? According to investopedia.com-------nano-caps are less than $50,000,000. Micro-caps are 50 to 300 million. Small-caps are 300-mill to 2-billion. Mid-caps are 2 to 10 billion. Large-caps are 10 to 200-billion. Mega-caps are greater than 200-billion. There you go! Those dollar levels can vary between brokerage firms, mutual funds and different indices.