Other Information
−Removed: During the three months ended March 31, 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.
+Added: 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.
See the index to exhibits immediately preceding the signature page to this report.
9 unchanged sentences
8-K 3.2 5/28/25 1-41642
−Removed: Form of Performance Stock Unit Award Agreement under the Long-Term Performance-Based Incentive Plan, effective March 4, 2026
−Removed: Promotion Letter with Glenn R.
−Removed: Pladsen dated as of January 1, 2025
+Added: 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.
+Added: Bank Trust Company, National Association
+Added: 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
+Added: 8-K 10.1 5/18/26 1-41642
+Added: Knife River Corporation Director Compensation Policy, as amended May 20, 2026
+Added: Offer Letter, dated May 20, 2026, between Knife River Corporation and Peggy S.
+Added: 8-K 10.1 5/21/26 1-41642
Certification of Chief Executive Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
13 unchanged sentences
Knife River Corporation
−Removed: May 5, 2026 BY:
+Added: August 4, 2026 BY:
/s/ Nathan W.
Vice President and Chief Financial Officer
−Removed: /s/ Marney L.
−Removed: Vice President and Chief Accounting Officer
+Added: Vice President, Chief Accounting Officer and Controller
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.