FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * GALLEN JONATHAN   2. Issuer Name and Ticker or Trading Symbol SEATTLE GENETICS INC /WA [SGEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 299 PARK AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 12/14/2006 (Street) NEW YORK, NY 10171 4. If Amendment, Date 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 (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, par value $0.001 per share 12/14/2006   S   50,000 D $ 5.7237 5,583,300 I By partnerships, corporations and private investment accounts (1) Common Stock, par value $0.001 per share 12/15/2006   S   250,000 D $ 5.7 5,333,300 I By partnerships, corporations and private investment accounts (1)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GALLEN JONATHAN 299 PARK AVENUE NEW YORK, NY 10171		X

Signatures

/s/ Jonathan Gallen		12/15/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(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).
(1)	As of December 15, 2006, Ahab Partners, L.P. ("Partners"), Ahab International, Ltd. ("International"), Queequeg Partners, L.P. ("Queequeg"), Queequeg, Ltd. ("Limited") and various private investment accounts (the "Accounts") held in the aggregate 5,333,300 shares of common stock, par value $0.001 per share (the "Shares"), of Seattle Genetics, Inc. Jonathan Gallen possesses sole power to vote and direct the disposition of 4,200,000 Shares held by Ahab, International, Queequeg and Limited. In addition, Mr. Gallen possesses sole power to direct the disposition of 1,133,300 Shares held by the Accounts. Accordingly, for the purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, Mr. Gallen is deemed to beneficially own 5,333,300 Shares. Jonathan Gallen's interest in the securities reported herein is limited to the extent of his pecuniary interest in Partners, International, Queequeg, Limited and the Accounts, respectively, if any.

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