Corporate Information

Our Annual Meeting of Stockholders will be held at 9:00 a.m. on May 15, 2007 at the offices of WilmerHale LLP, Sixty State Street, Boston, MA.

Common Stock
Our common stock is traded on the NASDAQ National Market under the symbol SEPR.

Primary Outside Legal Counsel
WilmerHale LLP, Boston, MA

Independent Registered Public Accounting Firm
PricewaterhouseCoopers LLP, Boston, MA

Corporate Headquarters
Sepracor Inc.
84 Waterford Drive
Marlborough, MA 01752
Telephone: (508) 481-6700
Facsimile: (508) 357-7499

Transfer Agent and Registrar
Questions regarding accounts, address changes, stock transfers and lost certificates should be directed to:

Computershare
P.O. Box 43010
Providence, RI 02940-3010
Phone: (781) 575-3120