Sec Form 4/A Filing - Cline Darren S @ SEATTLE GENETICS INC /WA - 2015-08-25

FORM 4/A 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 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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1. Name and Address of Reporting Person Cline Darren S 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 _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, Commercial (Last) (First) (Middle) 21823 30TH DRIVE SE 3. Date of Earliest Transaction (MM/DD/YY) 08/25/2015 (Street) BOTHELL, WA98021 4. If Amendment, Date Original Filed (MM/DD/YY) 08/22/2016 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 40,973 ( 1 ) ( 2 ) D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Incentive Stock Option Right to Buy $ 39.15 08/25/2015( 2 ) A 2,220 ( 3 ) 08/25/2025 Common Stock 2,220 $ 0 2,220 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Cline Darren S 21823 30TH DRIVE SE BOTHELL, WA98021 EVP, Commercial Signatures /s/ Darren S. Cline 08/24/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Amount of securities beneficially owned following reported transactions includes restricted stock units subject to vesting. ( 2 )Due to administrative error, on August 22, 2016, a Form 4 that had already been filed on August 25, 2015 was refiled (SEC Accession No. 0001203311-16-000118). This amendment to Form 4 is being filed solely to "withdraw" the mistakenly re-filed Form 4. One of the transactions reported in the August 22, 2016 Form 4 (an acquisition of 2,200 incentive stock options to purchase Common Stock) is being repeated in this amendment solely to be able to file this amendment with the SEC's EDGAR system. The Reporting Person's holdings as of the date of this Form 4/A filing are set forth in Table 1 above. ( 3 )The option shares shall vest at a rate of 25% on 08/25/2016 and monthly thereafter until all shares are fully vested four years from grant 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 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).

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