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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1060736	Seattle Genetics Inc	SGEN	Biological Products, (No Disgnostic Substances) (2836)	911874389

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1167496	B Clay Siegall	21823 30Th Drive Se Bothell WA 98021	President And Ceo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2013-08-19	7,653	$40.91	1,069,558	No	4	S	Direct
Common Stock	Acquisiton	2013-08-19	55,000	$0.00	1,124,558	No	4	A	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	A	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Incentive Stock Option (right to buy)	Acquisiton	2013-08-19	2,436	$41.04	2,436	$41.04
Common Stock	Non-Qualified Stock Option (right to buy)	Acquisiton	2013-08-19	135,064	$41.04	135,064	$41.04

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
2,436		2023-08-19	No	4	A	Direct
135,064		2023-08-19	No	4	A	Direct

Footnotes

Shares sold pursuant to a 10b5-1 arrangement to satisfy tax obligations arising out of the vesting of previously granted restricted stock units.
These shares represent restricted stock units and will be settled in common stock upon vesting.
Restricted stock units shall vest in full on August 19, 2016.
Amount of Securities beneficially owned following reported transactions includes 189,250 Restricted Stock Units subject to vesting.
Shares shall vest at a rate of 25% on August 19, 2014 and monthly thereafter until all the shares are fully vested on August 19, 2017.