Tharimmune, NovaBay Pharmaceuticals, and Auddia are the 3 Penny Stocks to watch on August 21, 2025, based on TipRanks’ Penny Stock Screener tool. Penny stocks are defined as stocks that trade at or ...

Trading in penny stocks has exploded over the past few years, driven in part by individual investors' ever-expanding appetite for risky bets, as well as a few tantalizing wins.