AstraZeneca PLC (AZN)
AstraZeneca PLC discovers, develops, manufactures, and commercializes prescription medicines in the areas of oncology, cardiovascular, renal and metabolism, respiratory, infection, neuroscience, and gastroenterology worldwide.
GlaxoSmithKline plc (GSK)
GlaxoSmithKline plc, together with its subsidiaries, engages in the creation, discovery, development, manufacture, and marketing of pharmaceutical products, vaccines, over-the-counter medicines, and health-related consumer products in the United Kingdom, the United States, and internationally. It operates through four segments: Pharmaceuticals, Pharmaceuticals R&D, Vaccines, and Consumer Healthcare.