NORTHWEST NATURAL GAS CO
For the period ended Sep 30, 2026. Filed Nov 5, 2026.
View on SEC.govAbout this filing
A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.
Sep 30, 2026 · Filed Nov 5, 2026
Extracted filing text, with the paragraph anchors used by the comparison.
See the whole filing, with its images and exhibitsContents
Item 6. Exhibits
See the Exhibit Index below, which is incorporated by reference herein.
Exhibit Index to Quarterly Report on Form 10-Q
For the Quarter Ended September 30, 2026
| Exhibit Index | |
|---|---|
| Exhibit Number | Document |
| *4.1 | Twenty-ninth Supplemental Indenture, providing for, among other things, (i) First Mortgage Bonds, 5.62% Series due 2036, and (ii) First Mortgage Bonds, 6.26% Series due 2056, dated as of August 15, 2026, by and between Northwest Natural Gas Company and Deutsche Bank Trust Company Americas. (incorporated by reference to Exhibit 4.1 to the Form 8-K dated September 3, 2026, File No. 1-15973). |
| 31.1 | Certification of Principal Executive Officer of Northwest Natural Gas Company Pursuant to Rule 13a-14(a)/15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| 31.2 | Certification of Principal Financial Officer of Northwest Natural Gas Company Pursuant to Rule 13a-14(a)/15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| 31.3 | Certification of Principal Executive Officer of Northwest Natural Holding Company Pursuant to Rule 13a-14(a)/15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| 31.4 | Certification of Principal Financial Officer of Northwest Natural Holding Company Pursuant to Rule 13a-14(a)/15-d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| **32.1 | Certification of Principal Executive Officer and Principal Financial Officer of Northwest Natural Gas Company Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |
| **32.2 | Certification of Principal Executive Officer and Principal Financial Officer of Northwest Natural Holding Company Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |
| 101 | The following materials formatted in Inline Extensible Business Reporting Language (Inline XBRL):(i) Consolidated Statements of Income;(ii) Consolidated Balance Sheets;(iii) Consolidated Statements of Cash Flows; and(iv) Related notes.The instance document does not appear in the interactive data file because XBRL tags are embedded within the Inline XBRL document. |
| 104 | The cover page from the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2026, formatted in Inline XBRL. |
- Incorporated by reference as indicated.
** Pursuant to Item 601(b)(32)(ii) of Regulation S-K, this certification is furnished and not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.
The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.