Eton Pharmaceuticals Inc., of Deer Park, Ill., plans to sell 3 million shares at $6 per share in an IPO, netting the company $15.5 million, or approximately $17.9 million if the underwriters exercise their option to purchase an additional 450,000 shares in full. The company plans to list on Nasdaq under the symbol ETON. National Securities is the sole bookrunner on the deal.