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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	Director	Officer	Large Shareholder	Other
1087939	Julian Baker	667 Madison Avenue, 17Th Floor New York NY US 10021	Yes	No	Yes	No
1087940	Felix Baker	667 Madison Avenue, 17Th Floor New York NY US 10021	Yes	No	Yes	No
1244390	Baker Bros. Capital (Gp), Llc	667 Madison Avenue 17Th Floor New York NY US 10021	Yes	No	Yes	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	2009-08-11	798	$10.75	481,890	No	4	P	Indirect	Through Partnership

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	Through Partnership

Footnotes

In addition to Baker Bros. Capital (GP), LLC, this Form 4 is being filed jointly by Felix J. Baker and Julian C. Baker, each of whom has the same business address as Baker Bros. Capital (GP), LLC and may be deemed to have a pecuniary interest in securities owned by it. Felix J. Baker is a director of the Issuer. Because of certain relationships with other security holders of the Issuer, the Reporting Persons are filing solely for informational purposes as if they were members of a group with such security holders. (Continued in footnote 2).
However, the Reporting Persons disclaim that they and any other person or persons, in fact constitute a "group" for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, or Rule 13d-5 thereunder or that they are the beneficial owners of securities owned by any such other persons, and each of them disclaims beneficial ownership of securities reported herein except to the extent of their pecuniary interest, if any, therein.
Represents shares of common stock acquired by Baker Bros. Investments II, L.P.
Represents shares 233,020 shares owned directly by Baker Bros. Investments, L.P. and 248,870 shares owned directly by Baker Bros. Investments II, L.P., limited partnerships of which the sole general partner is Baker Bros. Capital, L.P., a limited partnership of which the sole general partner is Baker Bros. Capital (GP), LLC. Felix J. Baker and Julian C. Baker are controlling members of Baker Bros. Capital (GP), LLC.