Small Cap

These are younger, smaller companies with a size of $250-$1 billion dollars.  You might have heard of a few, but not as many: Caterpillar, Comcast, Ethan Allen Interiors, Universal Electronics.

Micro Cap

These are the smallest, emerging companies with market capitalization under $250 million.  Probably you have not heard of most of these companies:  Wet Seal, Finish Line, Krispy Kreme Doughnuts.