SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* FBB3 LLC (Last) (First) (Middle) 667 MADISON AVENUE 21ST FLOOR (Street) NEW YORK NY 10065 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 12/09/2014	3. Issuer Name and Ticker or Trading Symbol SEATTLE GENETICS INC /WA [ SGEN ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	12,678	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Remarks: Julian C. Baker and Felix J. Baker are the sole managers of FBB3 LLC ("FBB3") and by virtue of their positions as sole managers have full voting and investment power over the shares of common stock of Seattle Genetics, Inc. (the "Issuer") directly held by FBB3. Julian C. Baker and Felix J. Baker have no pecuniary interest in the shares of common stock of the Issuer directly held by FBB3. Julian C. Baker and Felix J. Baker file Section 16 reports separately but may file jointly with FBB3 in the future. The shares of common stock of the Issuer that are subject to this report were received by FBB3 on December 9, 2014 from a contribution of Issuer common stock by members of FBB3 following a pro rata distribution for no consideration by 14159, L.P. conducted on December 9, 2014. For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, FBB3 is deemed a director by deputization by virtue of its representation on the Board of Directors of Seattle Genetics, Inc.

	FBB3 LLC Name: Julian C. Baker, Title: Manager /s/ Julian C. Baker	12/11/2014
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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