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
                                                                                  
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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 *

SIEGALL CLAY B
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
__X__ Officer (give title below)    _____ Other (specify below)
President and CEO
(Last)          (First)          (Middle)

21823 30TH DRIVE SE
3. Date of Earliest Transaction (MM/DD/YYYY)

3/9/2020
(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 3/9/2020  M  100 A$12.0 758884 (1)D  
Common Stock 3/9/2020  S(2)  100 D$113.29 758784 (1)D  
Common Stock 3/9/2020  M  900 A$12.0 759684 (1)D  
Common Stock 3/9/2020  S(2)  900 D$112.53 (3)758784 (1)D  
Common Stock 3/9/2020  M  3926 A$12.0 762710 (1)D  
Common Stock 3/9/2020  S(2)  3926 D$111.47 (4)758784 (1)D  
Common Stock 3/9/2020  M  9797 A$12.0 768581 (1)D  
Common Stock 3/9/2020  S(2)  9797 D$110.79 (5)758784 (1)D  
Common Stock 3/9/2020  M  8661 A$12.0 767445 (1)D  
Common Stock 3/9/2020  S(2)  8661 D$109.75 (6)758784 (1)D  
Common Stock 3/9/2020  M  2386 A$12.0 761170 (1)D  
Common Stock 3/9/2020  S(2)  2386 D$108.68 (7)758784 (1)D  
Common Stock 3/9/2020  M  953 A$12.0 759737 (1)D  
Common Stock 3/9/2020  S(2)  953 D$107.53 (8)758784 (1)D  
Common Stock 3/9/2020  M  1549 A$12.0 760333 (1)D  
Common Stock 3/9/2020  S(2)  1549 D$106.87 (9)758784 (1)D  
Common Stock 3/9/2020  M  200 A$12.0 758984 (1)D  
Common Stock 3/9/2020  S(2)  200 D$105.29 (10)758784 (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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     100   (11)8/27/2020 Common Stock 100 $0.0 170735 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     900   (11)8/27/2020 Common Stock 900 $0.0 169835 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     3926   (11)8/27/2020 Common Stock 3926 $0.0 165909 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     9797   (11)8/27/2020 Common Stock 9797 $0.0 156112 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     8661   (11)8/27/2020 Common Stock 8661 $0.0 147451 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     2386   (11)8/27/2020 Common Stock 2386 $0.0 145065 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     953   (11)8/27/2020 Common Stock 953 $0.0 144112 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     1549   (11)8/27/2020 Common Stock 1549 $0.0 142563 D  
Non-Qualified Stock Option (right to buy) $12.0 3/9/2020  M     200   (11)8/27/2020 Common Stock 200 $0.0 142363 D  

Explanation of Responses:
(1) Amount of securities beneficially owned following reported transactions includes restricted stock units subject to vesting.
(2) The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.
(3) Reflects sales of common stock executed in multiple transactions at prices ranging from $112.19 to $112.74. 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) Reflects sales of common stock executed in multiple transactions at prices ranging from $111.16 to $112.09. 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.
(5) Reflects sales of common stock executed in multiple transactions at prices ranging from $110.16 to $111.14. 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.
(6) Reflects sales of common stock executed in multiple transactions at prices ranging from $109.16 to $110.15. 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
(7) Reflects sales of common stock executed in multiple transactions at prices ranging from $108.14 to $109.09. 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.
(8) Reflects sales of common stock executed in multiple transactions at prices ranging from $107.11 to $107.86. 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.
(9) Reflects sales of common stock executed in multiple transactions at prices ranging from $106.11 to $107.10. 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.
(10) Reflects sales of common stock executed in multiple transactions at prices ranging from $105.00 to $105.57. 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.
(11) Options vested at a rate of 25% on 8/27/11 and monthly thereafter until all the shares were fully vested on 8/27/14.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
SIEGALL CLAY B
21823 30TH DRIVE SE
BOTHELL, WA 98021
X
President and CEO

Signatures
By: Jean Liu For: Clay B. Siegall3/11/2020
**Signature of Reporting PersonDate

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