X0306 4 2019-02-27 0 0001733998 Northwest Natural Holding Co NWN 0001605072 Imeson Thomas J 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 VP, Public Affairs Common Stock 2019-02-27 4 A 0 484 0 A 3882.168 D Common Stock 2019-02-27 4 A 0 190 0 A 3821.992 I See Footnote Common Stock 2019-02-27 4 A 0 1502 0 A 5384.168 D Common Stock 67.8080 I See Footnote Shares are issuable as a result of satisfaction of the performance threshold for 2018 under restricted stock unit awards. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date. Includes 1,151 time-based restricted stock units (RSUs) granted under issuer's Long Term Incentive Plan. The RSUs vest on March 31, 2019. Shares are issuable as a result of satisfaction of the performance threshold for 2018 under restricted stock unit award, and credited to reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives pursuant to a prior election. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold occurred on the transaction date. Shares have been credited to the reporting person's account under Northwest Natural Gas Company's Deferred Compensation Plan for Directors and Executives. Shares are issuable as a result of satisfaction of performance goals for 2016-2018 under a performance share award. Organization and Executive Compensation Committee certification of the award payout level occurred on the transaction date. Shares held in reporting person's account under the Northwest Natural Gas Company's Retirement K Savings Plan as of January 31, 2019. Shawn M. Filippi, Attorney-in-Fact 2019-02-28