GlaxoSmithKline plc is a British multinational pharmaceutical company headquartered in London, England. Established in 2000 by a merger of Glaxo Wellcome and SmithKline Beecham, GSK was the world's sixth largest pharmaceutical company according to Forbes as of 2019, after Pfizer, Novartis, Roche, Sanofi, and Merck & Co. GSK is the tenth largest pharmaceutical company and #296 on the 2019 Fortune 500, ranked behind other pharmaceutical companies including China Resources, Johnson & Johnson, Roche, Sinopharm, Pfizer, Novartis, Bayer, Merck, and Sanofi.
The company has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of August 2016, it had a market capitalisation of £81 billion, the fourth largest on the London Stock Exchange. It has a secondary listing on the New York Stock Exchange.
The company developed the first malaria vaccine, RTS,S, which it said in 2014 it would make available for five percent above cost. Legacy products developed at GSK include several listed in the World Health Organization's List of Essential Medicines, such as amoxicillin, mercaptopurine, pyrimethamine, and zidovudine.
In 2012, under prosecution by the United States Department of Justice based on combined investigations of the Department of Health and Human Services, FDA and FBI, primarily concerning sales and marketing of the drugs Avandia, Paxil, and Wellbutrin, GSK pleaded guilty to promotion of drugs for unapproved uses, failure to report safety data, and kickbacks to physicians in the United States and agreed to pay a US$3 billion settlement. It was the largest health-care fraud case to date in the US and the largest settlement by a drug company.
Highest paying job titles at GSK include Regional Account Manager, Account Manager, and Senior Scientist