• A Shire Plc logo sits on a wall outside the company's offices at the Citywest Business Campus in Dublin, Ireland, on Wednesday, Oct. 15, 2014.

    Deal to purchase NPS Pharmaceuticals will strengthen position in field of medicines for rare diseases.

    LAST UPDATE : Jan 12, 2015, 1:07 AM EST
  • A general view of buildings and signage at the Macclesfield Campus of pharmaceutical company AstraZenica on May 7, 2014 in Macclesfield, United Kingdom.

    AstraZeneca rejected a final offer from Pfizer earlier this month, saying the proposal undervalued the company.

    LAST UPDATE : May 27, 2014, 1:54 AM EDT