In 2017, top-performing penny stocks were driven by the biotech, cybersecurity, and renewable energy sectors, with companies like Pulmatrix Inc. (PULM) and Medical Transcription Billing Corp. (MTBC) recording high year-to-date returns. While analysts highlighted potential, they also warned of high volatility and risks associated with speculative micro-cap investments. For a detailed breakdown of the 2017 top stocks, visit Money Morning . This Penny Stocks 2017 List Shows the Best Performers