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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	Acquisiton	2011-04-14	50,000	$8.43	995,667	No	4	M	Direct
Common Stock	Disposition	2011-04-14	50,000	$15.27	945,667	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2011-04-14	50,000	$0.00	50,000	$8.43

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
100,000		2011-05-21	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	85,000	Indirect	by Trust

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Dr. Siegall on December 15, 2010 and described in a Form 8-K filed on December 17, 2010.
15.2691 represents an average price per share for the shares sold on 4/14/11. The sell price for shares sold on this day ranged from $15.0200 to $15.5702.
Shares shall vest at a rate of 25% on 5/21/02 and monthly thereafter until all the shares are fully vested on 5/21/05.