Sellas Life Sciences Group Inc. (NASDAQ:SLS) is one of the top long-term biotechnology stocks to buy. On October 27, SELLAS Life Sciences (NASDAQ:SLS) announced the immediate exercise of warrants for 22.4 million shares. The company raised $31 million in gross proceeds from the offering. Sellas Life Sciences Group Inc. (SLS) Advances Cancer Pipeline with$31M Funding and Upcoming R&D Showcase Investors who exercised the warrants, issued in March and August of last year, are poised to receive new register ...