Harmony Biosciences Holdings Inc (NASDAQ:HRMY) shares are trading lower by 18.3% to $33.89 Wednesday afternoon after the company announced a public offering of up to 8 million shares of common stock by selling shareholders Marshman Fund Trust II and Valor IV Pharma Holdings. What Else: Harmony Biosciences is offering 8 million shares of common stock through selling shareholders, who have granted underwriters a 30-day option to buy up to an additional 1.2 million shares. The offering will not increase the company’s outstanding share count, which will remain at 57,030,897 shares. Harmony will no…