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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
1809717	R Charles Romp	21823 30Th Drive Se Bothell WA 98021	Evp, Commercial	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	Explanation
Common Stock	Acquisiton	2020-05-08	6,942	$15.46	59,517	No	4	M	Direct
Common Stock	Disposition	2020-05-08	6,942	$163.02	52,575	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	2020-05-08	6,942	$0.00	6,942	$15.46

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
6,942		2021-08-24	No	4	M	Direct

Footnotes

Amount of securities beneficially owned following reported transactions includes restricted stock units subject to vesting.
Reflects sales of common stock executed in multiple transactions at prices ranging from $163.00 to $163.48. The price reported reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the sales were effected.
Options vested at a rate of 25% on 8/24/12 and monthly thereafter until all the shares were fully vested on 12/24/14.