BOTHELL, Wash.--(BUSINESS WIRE)--Seattle Genetics, Inc. (Nasdaq:SGEN) announced today the completion of its public offering of 11,500,000 shares of common stock, which includes exercise by the underwriters of their over-allotment option to purchase 1,500,000 shares. The public offering price of $9.00 per share results in net proceeds to Seattle Genetics of approximately $97.5 million, after deducting underwriting discounts and commissions and offering expenses.