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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
1202785	Eric Dobmeier	21823 30Th Drive Se Bothell WA 98021	Chief Operating Officer	No	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
Common Stock	Acquisiton	2011-10-27	10,083	$5.81	69,410	No	4	M	Direct
Common Stock	Disposition	2011-10-27	10,083	$21.95	59,327	No	4	S	Direct
Common Stock	Acquisiton	2011-10-27	10,835	$5.92	70,162	No	4	M	Direct
Common Stock	Disposition	2011-10-27	10,835	$21.95	59,327	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
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	Incentive Stock Option (right to buy)	Disposition	2011-10-27	10,083	$0.00	10,083	$5.81
Common Stock	Incentive Stock Option (right to buy)	Disposition	2011-10-27	10,835	$0.00	10,835	$5.92

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2004-08-29	2013-08-29	No	4	M	Direct
0		2015-01-31	No	4	M	Direct

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Eric Dobmeier on September 15, 2011.
Amount of securities beneficially owned following reported transactions includes 25,220 Restricted Stock Units subject to vesting.
Shares shall vest at a rate of 25% on 8/29/04 and monthly thereafter until all the shares are fully vested on 8/29/07.
Shares shall vest at a rate of 25% on 1/31/06 and monthly thereafter until all the shares are fully vested on 1/31/09.