Seattle Genetics To Host Conference Call And Webcast Discussion Of Second Quarter 2012 Financial Results On August 8, 2012

Seattle Genetics, Inc. (Nasdaq:SGEN) announced today that it will report its second quarter and year-to-date 2012 financial results on Wednesday, August 8, 2012, after the close of financial markets. Following the announcement, company management will host a conference call and webcast discussion of the results and provide a general corporate update. Access to the event can be obtained as follows:

LIVE access on Wednesday, August 8, 2012

1:30 p.m. Pacific Time (PT) / 4:30 p.m. Eastern Time (ET)

• Telephone [phone] (domestic) or 480-629-9643 (international); conference ID 4555600
• Webcast available at http://www.seattlegenetics.com in the Investors and News section

REPLAY access

• Telephone replay will be available beginning at approximately 3:30 p.m. PT on Wednesday, August 8, 2012, through 5:00 p.m. PT on Friday, August 10, 2012, by calling 800-406-7325 (domestic) or 303-590-3030 (international); conference ID 4555600
• Webcast replay will be available on the Seattle Genetics website at http://www.seattlegenetics.com in the Investors and News section

About Seattle Genetics

Seattle Genetics is a biotechnology company focused on the development and commercialization of monoclonal antibody-based therapies for the treatment of cancer. The U.S. Food and Drug Administration granted accelerated approval of ADCETRIS in August 2011 for two indications. ADCETRIS is being developed in collaboration with Millennium: The Takeda Oncology Company. In addition, Seattle Genetics has three other clinical-stage antibody-drug conjugate (ADC) programs: SGN-75, ASG-5ME and ASG-22ME. Seattle Genetics has collaborations for its ADC technology with a number of leading biotechnology and pharmaceutical companies, including Abbott, Bayer, Celldex Therapeutics, Daiichi Sankyo, Genentech, GlaxoSmithKline, Millennium, Pfizer and Progenics, as well as ADC co-development agreements with Agensys, an affiliate of Astellas, and Genmab. More information can be found at www.seattlegenetics.com.

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