Statement of Changes in Beneficial Ownership (4)

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

OMB APPROVAL

OMB Number:

3235-0287

Estimated average burden
hours per response...

0.5

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * LIPPMAN MARC E	2. Issuer Name and Ticker or Trading Symbol SEATTLE GENETICS INC /WA [ SGEN ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director                    _____ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) 21823 30TH DRIVE SE	3. Date of Earliest Transaction (MM/DD/YYYY) 11/18/2019
(Street) BOTHELL, WA 98021 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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	11/18/2019		M		17500	A	$19.02	148813 (1)	D
Common Stock	11/18/2019		S		17500	D	$116.17 (2)	131313 (1)	D
Common Stock	11/18/2019		M		17500	A	$12.76	148813 (1)	D
Common Stock	11/18/2019		S		17500	D	$115.43 (3)	131313 (1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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
Non-Qualified Stock Option (right to buy)	$12.76	11/18/2019		M			17500	(4)	5/21/2020	Common Stock	17500	$0.0	0	D
Non-Qualified Stock Option (right to buy)	$19.02	11/18/2019		M			17500	(5)	5/19/2021	Common Stock	17500	$0.0	0	D

Explanation of Responses:
(1)	Amount of securities beneficially owned following reported transactions includes restricted stock units subject to vesting.
(2)	Reflects sales of common stock executed in multiple transactions at prices ranging from $115.89 to $116.61. 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.
(3)	Reflects sales of common stock executed in multiple transactions at prices ranging from $115.06 to $115.89. 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.
(4)	Options were fully vested on 5/20/11.
(5)	Options were fully vested on 5/20/12.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LIPPMAN MARC E 21823 30TH DRIVE SE BOTHELL, WA 98021	X

Signatures
By: /s/ Jean Liu For: Marc E. Lippman		11/20/2019
**Signature of Reporting Person		Date