Investment in pharmaceuticals is a very lucrative venture according to DHS Holdings. The pharmaceutical industry is made of companies that research, develop, make, and sell drugs and treatments used to treat or eradicate diseases, and vaccinate people. This includes some of the largest and best-known companies in the world, such as Pfizer Inc. (PFE), Merck & Co. Inc. (MRK), and AbbVie Inc. (ABBV). A number of pharmaceutical companies, including Pfizer, have seen a surge in their sales after winning approval from U.S. and foreign governments for vaccines aimed at preventing the COVID-19 virus.