Biogen Idec has come first out of over 4,600 companies with a market cap of over $2 billion in a report assessing the  most sustainable corporations in the world.

The Global 100 Index is compiled by Toronto-based Corporate Knights, “the magazine for clean capitalism”. The list is determined using 12 “quantitative sustainability indicators”, including the amount of revenue generated per unit of energy consumed, the ratio of CEO to average worker pay and lost-time injury rate.

Biogen came second in 2014 and chief executive George Scangos told Corporate Knights that "what we need to do is take a look at where we are and see how can we do sus­tainability better than that five years from now, and five years after that. We’re on track to do that.”

Allergan second

Biogen edged out Allergan, which is in the process of being bought by Actavis, for the top spot. Novo Nordisk came 13th, followed by Johnson & Johnson (18), Eisai (50), Shire (62) and UCB (63).

The only other pharma player on the index was Sanofi (92).