Boutique investment bank Greenhill & Co has followed up an impressive year in European advisory in 2013 with a role on one of the biggest deals of 2014 so far.

The bank is advising pharmaceuticals company Actavis, based in Dublin, on its acquisition of rival drug maker Forest Laboratories. The deal, valued at $25 billion, is the second-biggest of the year so far - Comcast is the largest at $45 billion. It will be paid by a combination of cash and equity.