It’s an exciting time for penny stocks, especially hot penny stocks like Achillion Pharmaceuticals (ACHN), Armco Metals Holding (AMCO), and GreenHunter Energy (GRH) Achillion Pharmaceuticals (NASDAQ: ACHN) ACHN is soaring into the stratosphere! Shares of this once high flying biotech stock had been shunned by investors for the past eight months. But last week, buyers […]