SC 13D/A

SEATTLE GENETICS INC /WA

Security class unavailable · CUSIP: 812578102

Event date: 2017-05-15

Legacy cover-page extraction is best effort and may not include every reporting person.

Filing-level shares

45,834,076

Percent of class

32.1000%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.