Cosan S.A. (NYSE:CSAN) is one of the Best Penny Stocks to Buy with the Highest Upside Potential. On September 22, Reuters reported that Cosan S.A. (NYSE:CSAN) a major Brazilian conglomerate, indicated its plans to raise up to 10 billion reais ($1.9 billion) through public offerings. Management noted that the funds will be used only to reduce Cosan’s debt, not to support its joint venture, Raizen, with Shell. The company’s net debt stood at 17.5 billion reais at the end of June, unchanged from earlier in th ...