The Board of Directors of Momenta Pharmaceuticals, Inc. designated Craig A. Wheeler, the Company's President and Chief Executive Officer, as the principal financial officer and principal accounting officer of the Company, effective at the close of business May 8, 2018. Mr. Wheeler will perform the functions of principal financial officer and principal accounting officer while Scott M. Storer, the company's Chief Financial Officer, is on a temporary medical leave of absence and until Mr. Storer is able to resume the duties of principal financial officer and principal accounting officer on a full-time basis. Craig A. Wheeler has served as the Company's President and a director since August 2006 and was appointed Chief Executive Officer effective September 2006.

Prior to joining the Company, Mr. Wheeler served as President of Chiron Biopharmaceuticals, a division of Chiron Corporation, a biotechnology company, from August 2001 until June 2006. Mr. Wheeler serves on the board of Amicus Therapeutics, Inc., including serving on the science and compensation committees. Mr. Wheeler served as a director of Avanir Pharmaceuticals, Inc., which was acquired by Otsuka Pharmaceuticals Co.

Ltd., from September 2005 to January 2015, including serving on the corporate governance and audit committees, and serving as chairman of the board beginning May 2007. Mr. Wheeler has been a member of the board of the Association for Accessible Medicines, formerly known as the Generic Pharmaceutical Association, for over eight years, including serving as chairman of the board from 2014 to 2016 and as a member of the executive committee for the past six years.