X0206 3/A 2016-02-25 2016-03-01 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001668229 Murandu Ngoni 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 VP & CIO Phantom Restricted Stock Units Common Stock 1320 D The phantom restricted stock units (Phantom RSUs) vest in two equal installments on each March 31, 2016 and 2017. These Phantom RSUs were omitted from the original Form 3 filing. Each Phantom RSU is the economic equivalent of one share of Issuer's common stock, plus accrued dividends, payable in cash. Shawn M. Filippi, Attorney-in-Fact 2016-05-06