| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13D/A | 2016-11-09 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 45,821,116 | 32.3% | EDGAR |
| SC 13D/A | 2016-09-15 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 44,209,554 | 31.4% | EDGAR |
| SC 13D/A | 2016-03-21 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 43,348,227 | 31.0% | EDGAR |
| SC 13D/A | 2016-03-16 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 43,214,902 | 30.9% | EDGAR |
| SC 13D/A | 2016-03-08 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 41,167,299 | 29.4% | EDGAR |
| SC 13D/A | 2016-02-22 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 39,674,346 | 28.3% | EDGAR |
| SC 13D/A | 2016-02-17 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 38,672,875 | 27.7% | EDGAR |
| SC 13G/A | 2016-02-12 | FMR LLC | SEATTLE GENETICS INC /WA | 17,130,631 | 12.3% | EDGAR |
| SC 13G/A | 2016-02-12 | PRIMECAP MANAGEMENT CO/CA/ | SEATTLE GENETICS INC /WA | 12,882,175 | 9.4% | EDGAR |
| SC 13G/A | 2016-02-09 | BAILLIE GIFFORD & CO | SEATTLE GENETICS INC /WA | 17,152,807 | 12.3% | EDGAR |
| SC 13D/A | 2015-11-20 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 37,403,728 | 26.8% | EDGAR |
| SC 13D/A | 2015-09-15 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 36,139,746 | 25.9% | EDGAR |
| SC 13D/A | 2015-05-08 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 30,029,376 | 24.0% | EDGAR |
| SC 13G/A | 2015-02-13 | FMR LLC | SEATTLE GENETICS INC /WA | 18,583,737 | 15.0% | EDGAR |
| SC 13G/A | 2015-02-13 | CAPITAL GROUP INTERNATIONAL INC | SEATTLE GENETICS INC /WA | 2,866,637 | 2.3% | EDGAR |
| SC 13G/A | 2015-02-13 | PRIMECAP MANAGEMENT CO/CA/ | SEATTLE GENETICS INC /WA | 11,178,050 | 9.0% | EDGAR |
| SC 13G/A | 2015-02-11 | VANGUARD GROUP INC | SEATTLE GENETICS INC /WA | 6,165,667 | 5.0% | EDGAR |
| SC 13G/A | 2015-02-10 | COLUMBIA WANGER ASSET MANAGEMENT LLC | SEATTLE GENETICS INC /WA | 10 | - | EDGAR |
| SC 13G/A | 2015-02-03 | BAILLIE GIFFORD & CO | SEATTLE GENETICS INC /WA | 15,238,601 | 12.3% | EDGAR |
| SC 13D/A | 2014-12-17 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 27,969,470 | 22.6% | EDGAR |