Seagen Inc. Common Stock. Replay the stock market charts of SGEN day by day back to 2003. Open long and short positions without spending any money. Seattle Genetics Inc is a biotechnology company. The company is focused on development and commercialization of targeted therapies for the treatment of cancer. Its products are ADCETRIS (brentuximab vedotin) US and ADCETRIS (brentuximab vedotin) Canada.