Glaxo

GlaxoSmithKline

GSK's head office, Isleworth , London TW8
Type	Public limited company
Traded as	:  : GSK
Industry	Pharmaceutical Biotechnology Consumer goods
Predecessor	Glaxo plc Wellcome plc Beecham Group plc Kline & French Beckman Companies Smith plc
Founded	December 2000; 16 years ago (2000-12)
Headquarters	Isleworth, London, England, U.K.
Area served	Worldwide
Key people	Sir Philip Hampton (Chairman) Sir Andrew Witty (CEO)
Products	Pharmaceuticals, vaccines, oral healthcare, nutritional products, over-the-counter medicines
Revenue	£23.923 billion (2015)
Operating income	£10.322 billion (2015)
Net income	£8.372 billion (2015)
Number of employees	96,575 (2015)
Subsidiaries	Stiefel Laboratories
Website	www.gsk.com

GlaxoSmithKline plc (GSK) is a British pharmaceutical company headquartered in Brentford, London. Established in 2000 by a merger of Glaxo Wellcome and SmithKline Beecham, GSK was the world's sixth largest pharmaceutical company as of 2015, after Pfizer, Novartis, Merck, Hoffmann-La Roche and Sanofi.Andrew Witty has been the chief executive officer since 2008.

The company has a primary listing on the and is a constituent of the FTSE 100 Index. As of August 2016 it had a market capitalisation of £81 billion (around $107 billion), the fourth largest on the London Stock Exchange. It has a secondary listing on the .

GSK's drugs and vaccines earned £21.3 billion in 2013. Its top-selling products that year were Advair, Avodart, Flovent, Augmentin, Lovaza and Lamictal. GSK's consumer products, which earned £5.2 billion in 2013, include Sensodyne and Aquafresh toothpaste, the malted-milk drink Horlicks, Abreva for cold sores, Breathe Right nasal strips, Nicoderm and Nicorette nicotine replacements, and Night Nurse, a cold remedy. 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 Model List of Essential Medicines, such as amoxicillin, mercaptopurine, pyrimethamine and zidovudine.