5. AstraZeneca 

AstraZeneca is a British multinational company which is headquartered in London. In 1999, Sweden based Astra AB and UK-based Zeneca Group merged together to form AstraZeneca. And it is the fifth-largest pharmaceutical company after Pfizer, Novartis, Sanofi and GlaxoSmithKline. As of 2011 report, company is generating around $33.59 billion revenue. It employs over 61,000 people in its different divisions like developing, manufacturing, selling and researching pharmaceuticals to treat different disorders. It has earned a 4.319 in the rating for Happiest Companies for Young Professionals.

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