Knife River Corp 10-Q

Item 5. Other Information During the three months ended June 30, 2026, no director or officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K. Item 6. Exhibits See the index to exhibits immediately preceding the signature page to this report. 40 Index Exhibits Index Incorporated by Reference Exhibit Number Exhibit Description Filed Herewith Furnished Herewith Form Period Ended Exhibit Filing Date File Number 3.1 Second Amended and Restated Certificate of Incorporation of Knife River Corporation 8-K 3.1 5/28/25 1-41642 3.2 Second Amended and Restated Bylaws of Knife River Corporation 8-K 3.2 5/28/25 1-41642 4.1 Fourth Supplemental Indenture, dated as of April 20, 2026, by and among the parties that are signatories hereto as Guarantors, Knife River Corporation and U.S. Bank Trust Company, National Association X 4.2 Second Amendment, dated as of May 15, 2026, among Knife River Corporation, as borrower, the guarantors party thereto, the lenders and other parties party thereto, and JPMorgan Chase Bank, N.A., as administrative agent 8-K 10.1 5/18/26 1-41642 10.1+ Knife River Corporation Director Compensation Policy, as amended May 20, 2026 X 10.2+ Offer Letter, dated May 20, 2026, between Knife River Corporation and Peggy S. Rebstock 8-K 10.1 5/21/26 1-41642 31.1 Certification of Chief Executive Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 X 31.2 Certification of Chief Financial Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 X 32 Certification of Chief Executive Officer and Chief Financial Officer furnished pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 X 95 Mine Safety Disclosures X 101.INS XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document 101.SCH XBRL Taxonomy Extension Schema Document 101.CAL XBRL Taxonomy Extension Calculation Linkbase Document 101.DEF XBRL Taxonomy Extension Definition Linkbase Document 101.LAB XBRL Taxonomy Extension Label Linkbase Document 101.PRE XBRL Taxonomy Extension Presentation Linkbase Document 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) + Management contract, compensatory plan or arrangement. 41 Index Signatures Pursuant to the requirements of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Knife River Corporation DATE: August 4, 2026 BY: /s/ Nathan W. Ring Nathan W. Ring Vice President and Chief Financial Officer BY: /s/ Peggy S. Rebstock Peggy S. Rebstock Vice President, Chief Accounting Officer and Controller 42