Investor FAQ

1.What is the ticker symbol for Seattle Genetics?
2.When did Seattle Genetics go public?
3.When was Seattle Genetics founded?
4.In what State was Seattle Genetics incorporated?
5.Who is Seattle Genetics' transfer agent?
6.How do I change the address on my stockholder account?
7.Does Seattle Genetics offer a Direct Stock Purchase Plan?
8.How can I buy Seattle Genetics stock?
9.What is Seattle Genetics' fiscal year?
10.What is the CUSIP number for Seattle Genetics?
11.Who is outside legal counsel for Seattle Genetics?
12.Who are the independent auditors for Seattle Genetics?

1.What is the ticker symbol for Seattle Genetics?
 Shares of Seattle Genetics are traded on Nasdaq under the symbol SGEN.

2.When did Seattle Genetics go public?
 We started trading publicly on March 7, 2001 at an initial offering price of $7.00 per share.

3.When was Seattle Genetics founded?
 The company started operations in January 1998.

4.In what State was Seattle Genetics incorporated?
 The company was incorporated in the State of Delaware.

5.Who is Seattle Genetics' transfer agent?
 Our transfer agent is Computershare Shareowner Services LLC. They can be contacted at

Computershare
P.O. BOX 30170
College Station, TX 77842-3170
https://www-us.computershare.com/investor

Overnight correspondence should be sent to:
Computershare
211 Quality Circle, Suite 210
College Station, TX 77845

Toll Free 877-419-8489
Outside the U.S.781-575-4591
Hearing Impaired 800-952-9245
TDD International Shareholders 781-575-4592

6.How do I change the address on my stockholder account?
 If you own shares through a brokerage firm, you need to contact that firm directly to change your account address.

If you own shares in the form of a stock certificate, you may update your address by contacting our transfer agent, Computershare Shareowner Services LLC, at 877-419-8489 or via their website.


7.Does Seattle Genetics offer a Direct Stock Purchase Plan?
 No, we do not currently have a program in place for the purchase of shares directly from the company.

8.How can I buy Seattle Genetics stock?
 Shares of Seattle Genetics common stock can be purchased by contacting a securities broker. We are traded on Nasdaq under the symbol SGEN.

9.What is Seattle Genetics' fiscal year?
 Our fiscal year is based on the calendar year, and runs January 1 through December 31.

10.What is the CUSIP number for Seattle Genetics?
 Our common stock CUSIP number is 812578 102.

11.Who is outside legal counsel for Seattle Genetics?
 Cooley Godward Kronish
Seattle, WA

12.Who are the independent auditors for Seattle Genetics?
 PricewaterhouseCoopers, LLP
Seattle, WA