Mega-Cap over $200 billion over $250 billion Large-Cap $10 billion - $200 billion. $5 billion - $250 billion Mid-Cap $2 billion - $10 billion $1 billion - $5 billion Small-Cap $300 million - $2 billion $250 million - $1 billion Micro-Cap $50 million - $300 million under 250 million Nano-Cap under $50 million --