Seattle Genetics Inc (SGEN): Baker Bros. Keeps Buying Shares

Page 15 of 15

Page 15 of 15 SEC Filing

SIGNATURE

After reasonable inquiry and to the best of my
knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

March 8, 2016

BAKER BROS. ADVISORS LP

 

By:  Baker Bros. Advisors (GP) LLC,

its general partner

By: /s/ Scott L. Lessing
Name: Scott L. Lessing
Title: President
BAKER BROS. ADVISORS (GP) LLC
By: /s/ Scott L. Lessing
Name: Scott L. Lessing
Title: President
/s/ Julian C. Baker
Julian C. Baker
/s/ Felix J. Baker
Felix J. Baker
FBB2, LLC
By: /s/ Julian C. Baker
Name: Julian C. Baker
Title: Manager
FBB3 LLC
By: /s/ Julian C. Baker
Name: Julian C. Baker
Title: Manager

Page 15 of 15 Pages

Follow Seagen Inc. (NASDAQ:SGEN)

Page 15 of 15