penny stocks10 Top Biotech Penny Stocks to Watch for September 2017 September 6, 2017 by Alex McGuire Today, we're showing you the top biotech penny stocks to watch for September 2017. These include the top performers of August, two of which climbed more than 100% last month. Here's the full list - plus, the best biotech stock to buy for a 94.4% gain by next year...