BOTHELL, Wash.--(BUSINESS WIRE)--Seattle Genetics, Inc. (NASDAQ:SGEN), announced today that it has agreed to sell an aggregate of 10,000,000 shares of its common stock in an underwritten public offering at a price to the public of $9.00 per share. The company has granted the underwriters a 30-day option to purchase up to an additional 1,500,000 shares of common stock to cover over-allotments, if any. All of the shares are being offered by Seattle Genetics. The offering is expected to close on or about January 24, 2008, subject to customary conditions.