ROCKVILLE, Md.--(BUSINESS WIRE)--Human Genome Sciences, Inc. (Nasdaq: HGSI) today announced the exercise in full of the underwriter’s option to purchase an additional $64.5 million principal amount of its Convertible Senior Notes due 2018 in connection with its public offering of the notes on November 2, 2011, for a total offering size of $494.5 million. Citigroup is acting as the underwriter, and will purchase the additional $64.5 million principal amount of notes from the company. The offering is expected to close on November 7, 2011, subject to customary closing conditions.
