5 Best Biotech Stocks To Buy For 2021 5. Vertex Pharmaceuticals Incorporated (NASDAQ: VRTX) Vertex Pharmaceuticals (NASDAQ: VRTX) is a Boston-based firm that aims to develop and manufacture transformative medicine for people with serious diseases. It has a market cap of well over $55 billion and generates an annual revenue of well over $6 billion. In fact, in 2020, the revenue soared 50% compared to the previous year. The company enjoys a monopoly in treating cystic fibrosis and presently markets four drugs related to the disease. A new drug in this group has soared to incredible highs in the US and is now slated for worldwide growth.