| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2010-02-16 | FMR LLC | SEATTLE GENETICS INC /WA | 14,875,850 | 14.8% | EDGAR |
| SC 13G | 2010-02-12 | WELLINGTON MANAGEMENT CO LLP | SEATTLE GENETICS INC /WA | 9,352,203 | 9.3% | EDGAR |
| SC 13G/A | 2010-02-10 | COLUMBIA WANGER ASSET MANAGEMENT LP | SEATTLE GENETICS INC /WA | 5,357,784 | 5.3% | EDGAR |
| SC 13G | 2010-02-03 | OPPENHEIMER FUNDS INC | SEATTLE GENETICS INC /WA | 5,666,776 | 5.6% | EDGAR |
| SC 13G/A | 2009-02-17 | FMR LLC | SEATTLE GENETICS INC /WA | 10,366,565 | 13.0% | EDGAR |
| SC 13G/A | 2009-02-17 | GALLEN JONATHAN | SEATTLE GENETICS INC /WA | 1,614,125 | 2.0% | EDGAR |
| SC 13G/A | 2009-02-09 | COLUMBIA WANGER ASSET MANAGEMENT LP | SEATTLE GENETICS INC /WA | 5,807,900 | 7.3% | EDGAR |
| SC 13G/A | 2009-01-29 | OPPENHEIMER FUNDS INC | SEATTLE GENETICS INC /WA | 3,918,765 | 4.9% | EDGAR |
| SC 13D/A | 2008-07-21 | JP MORGAN PARTNERS BHCA LP | SEATTLE GENETICS INC /WA | 2,263,980 | 2.8% | EDGAR |
| SC 13G/A | 2008-02-14 | FMR LLC | SEATTLE GENETICS INC /WA | 8,590,089 | 12.8% | EDGAR |
| SC 13G/A | 2008-02-14 | GALLEN JONATHAN | SEATTLE GENETICS INC /WA | 5,554,250 | 8.2% | EDGAR |
| SC 13G/A | 2008-02-14 | BILL & MELINDA GATES FOUNDATION TRUST | SEATTLE GENETICS INC /WA | 3,521,088 | 4.5% | EDGAR |
| SC 13G | 2008-02-05 | OPPENHEIMER FUNDS INC | SEATTLE GENETICS INC /WA | 3,532,431 | 5.2% | EDGAR |
| SC 13D/A | 2008-01-24 | BAKER JULIAN | SEATTLE GENETICS INC /WA | 13,115,373 | 16.4% | EDGAR |
| SC 13G | 2008-01-23 | COLUMBIA WANGER ASSET MANAGEMENT LP | SEATTLE GENETICS INC /WA | 5,048,800 | 7.5% | EDGAR |
| SC 13D | 2007-03-01 | JP MORGAN PARTNERS BHCA LP | SEATTLE GENETICS INC /WA | 2,753,574 | 5.4% | EDGAR |
| SC 13D/A | 2007-02-16 | BAKER JULIAN | SEATTLE GENETICS INC /WA | 10,325,089 | 17.7% | EDGAR |
| SC 13G/A | 2007-02-14 | FMR CORP | SEATTLE GENETICS INC /WA | 5,101,487 | 10.0% | EDGAR |
| SC 13G/A | 2007-01-12 | GALLEN JONATHAN | SEATTLE GENETICS INC /WA | 5,332,750 | 10.5% | EDGAR |
| SC 13G/A | 2007-01-09 | GALLEN JONATHAN | SEATTLE GENETICS INC /WA | 5,333,300 | 10.5% | EDGAR |