He is trading penny stocks with a market cap is less than $50 million, generally.

http://www.investopedia.com/terms/n/nanocap.asp

The amount of money needed to move the needle on these is very small, its why they are often used in pump & dumps.

He doesn't have anything to do with "Wall Street" which works with stocks that follow SEC rules, commodities, etc. in the way you mean.