Brokerage firms have varying levels at which they will let a person trade stock, and some don’t want their customers to buy penny stocks. Find out how to identify a stock brokerage firm that can be used to sell penny stocks by interviewing a few with help from a portfolio manager in this free video on penny stocks and investments. Expert: Roger Groh Bio: Roger Groh is the founder of Groh Asset Management. Filmmaker: Bing Hu