| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G | 2019-02-08 | BlackRock Inc. | SEATTLE GENETICS INC /WA | 9,104,981 | 5.6% | EDGAR |
| SC 13G/A | 2018-12-06 | BAILLIE GIFFORD & CO | SEATTLE GENETICS INC /WA | 6,611,197 | 4.1% | EDGAR |
| SC 13D/A | 2018-06-05 | SEATTLE GENETICS INC /WA | IMMUNOMEDICS INC | 8,282,804 | 4.9% | EDGAR |
| SC 13D/A | 2018-05-02 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 50,693,189 | 32.0% | EDGAR |
| SC 13G/A | 2018-03-08 | BlackRock Inc. | SEATTLE GENETICS INC /WA | 7,821,527 | 5.0% | EDGAR |
| SC 13G/A | 2018-02-27 | PRIMECAP MANAGEMENT CO/CA/ | SEATTLE GENETICS INC /WA | 12,714,100 | 8.8% | EDGAR |
| SC 13G | 2018-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | SEATTLE GENETICS INC /WA | 7,798,646 | 5.4% | EDGAR |
| SC 13G | 2018-02-14 | Capital International Investors | SEATTLE GENETICS INC /WA | 7,616,084 | 5.2% | EDGAR |
| SC 13G/A | 2018-02-13 | FMR LLC | SEATTLE GENETICS INC /WA | 6,428,347 | 4.5% | EDGAR |
| SC 13G/A | 2018-02-09 | VANGUARD GROUP INC | SEATTLE GENETICS INC /WA | 7,784,502 | 5.4% | EDGAR |
| SC 13D/A | 2018-02-05 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 49,680,229 | 31.6% | EDGAR |
| SC 13G | 2018-02-01 | BlackRock Inc. | SEATTLE GENETICS INC /WA | 7,756,494 | 5.4% | EDGAR |
| SC 13G/A | 2018-01-24 | BAILLIE GIFFORD & CO | SEATTLE GENETICS INC /WA | 14,964,511 | 10.4% | EDGAR |
| SC 13D/A | 2017-12-06 | SEATTLE GENETICS INC /WA | IMMUNOMEDICS INC | 11,655,804 | 7.3% | EDGAR |
| SC 13D | 2017-07-07 | SEATTLE GENETICS INC /WA | IMMUNOMEDICS INC | 11,655,804 | 8.2% | EDGAR |
| SC 13D/A | 2017-05-17 | BAKER BROS. ADVISORS LP | SEATTLE GENETICS INC /WA | 45,834,076 | 32.1% | EDGAR |
| SC 13G/A | 2017-02-14 | FMR LLC | SEATTLE GENETICS INC /WA | 11,777,880 | 8.3% | EDGAR |
| SC 13G | 2017-02-13 | VANGUARD GROUP INC | SEATTLE GENETICS INC /WA | 7,087,643 | 5.0% | EDGAR |
| SC 13G/A | 2017-02-09 | PRIMECAP MANAGEMENT CO/CA/ | SEATTLE GENETICS INC /WA | 13,230,162 | 9.4% | EDGAR |
| SC 13G/A | 2017-02-06 | BAILLIE GIFFORD & CO | SEATTLE GENETICS INC /WA | 16,570,644 | 11.7% | EDGAR |