Sec Form 4 Filing - Filippi Shawn M @ NORTHWEST NATURAL GAS CO - 2017-06-09

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 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 Filippi Shawn M 2. Issuer Name and Ticker or Trading Symbol NORTHWEST NATURAL GAS CO [ NWN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) VP, CCO & Corporate Secretary (Last) (First) (Middle) 220 NW SECOND AVE 3. Date of Earliest Transaction (MM/DD/YY) 06/09/2017 (Street) PORTLAND, OR97209 4. If Amendment, Date Original Filed (MM/DD/YY) 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 06/09/2017 M 600 A $ 41.15 1,330.3227 D Common Stock 06/09/2017 S 600 D $ 62.2709 ( 1 ) 730.3227 D Common Stock 06/09/2017 M 600 A $ 44.25 1,330.3227 D Common Stock 06/09/2017 S 600 D $ 62.2709 ( 1 ) 730.3227 D Common Stock 810.0021 I See Footnote ( 2 ) Common Stock 181.416 I See Footnote ( 3 )

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 Employee Stock Option to Buy $ 41.15 06/09/2017 M 600 ( 4 ) 03/04/2019 Common Stock 600 $ 0 ( 6 ) 0 D Employee Stock Option to Buy $ 44.25 06/09/2017 M 600 ( 5 ) 03/02/2020 Common Stock 600 $ 0 ( 6 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Filippi Shawn M 220 NW SECOND AVE PORTLAND, OR97209 VP, CCO & Corporate Secretary Signatures Shawn M. Filippi 06/13/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This transaction was executed in multiple trades for an aggregate of 1,200 shares on reported date with prices ranging from $62.25 - $62.30, resulting in an average price of $62.2709. Northwest Natural Gas Company ("Issuer") will provide upon request by the Commission staff or a security holder of the Issuer full information regarding the number of shares purchased or sold at each separate price. ( 2 )Shares held in reporting person's account in Issuer's Retirement K Savings Plan as of May 31, 2017. ( 3 )Shares have been credited to reporting person's account under the Issuer's Deferred Compensation Plan for Directors and Executives. ( 4 )The option vested in four equal installments on each of February 25, 2010, and January 1, 2011, 2012 and 2013. ( 5 )The option vested in four equal installments on each of February 24, 2011, and January 1, 2012, 2013 and 2014. ( 6 )Option was granted as part of compensation for services. The option was exercised as a cashless exercise.

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