| 2026-08-04 | 10-Q | 10.1 | KNIFE RIVER CORPORATION DIRECTOR COMPENSATION POLICY |
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| 2026-05-21 | 8-K | 10.1 | Offer Letter, dated May 20, 2026, between Knife River Corporation and Peggy S. Rebstock. |
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| 2026-05-18 | 8-K | 10.1 | Second Amendment, dated as of May 15, 2026, among Knife River Corporation, as |
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| 2026-05-05 | 10-Q | 10.2 | PROMOTION LETTER WITH GLENN PLADSEN |
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| 2026-05-05 | 10-Q | 10.1 | KNIFE RIVER PERFORMANCE STOCK UNIT AWARD AGREEMENT |
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| 2026-02-20 | 10-K | 10.19 | KNIFE RIVER SECTION 16 OFFICERS AND DIRECTORS |
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| 2026-02-20 | 10-K | 10.15 | KNIFE RIVER 401(K) RETIREMENT PLAN |
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| 2026-02-20 | 10-K | 10.14 | KNIFE RIVER CORPORATION DEFERRED COMPENSATION PLAN FOR DIRECTORS |
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| 2025-08-05 | 10-Q | 10.3 | KNIFE RIVER 401(K) RETIREMENT PLAN |
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| 2025-08-05 | 10-Q | 10.2 | KNIFE RIVER 401(K) RETIREMENT PLAN |
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| 2025-08-05 | 10-Q | 10.1 | KNIFE RIVER CORPORATION DIRECTOR COMPENSATION POLICY |
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| 2025-05-06 | 10-Q | 10.6 | KNIFE RIVER DIRECTOR AND/OR EXECUTIVE OFFICER INDEMNIFICATION AGREEMENT |
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| 2025-05-06 | 10-Q | 10.5 | KNIFE RIVER SECTION 16 OFFICERS AND DIRECTORS |
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| 2025-05-06 | 10-Q | 10.4 | KNIFE RIVER 401(K) RETIREMENT PLAN |
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| 2025-05-06 | 10-Q | 10.3 | KNIFE RIVER PERFORMANCE STOCK UNIT AWARD AGREEMENT |
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| 2025-05-06 | 10-Q | 10.2 | KNIFE RIVER RESTRICTIVE STOCK UNIT AWARD AGREEMENT |
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| 2025-03-10 | 8-K | 10.1 | First Amendment, dated as of March 7, 2025, among Knife River Corporation, as |
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| 2025-02-21 | 10-K | 10.18 | KNIFE RIVER 401(K) RETIREMENT PLAN |
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| 2024-08-21 | 8-K | 10.1 | Knife River Corporation Change in Control Severance Plan |
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| 2024-08-06 | 10-Q | 10.A | KNIFE RIVER CORPORATION DIRECTOR COMPENSATION POLICY |
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| 2024-08-06 | 10-Q | 10.B | FORM OF KNIFE RIVER CORPORATION RESTRICTED STOCK UNIT AWARD AGREEMENT |
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| 2024-08-06 | 10-Q | 10.C | KNIFE RIVER SECTION 16 OFFICERS AND DIRECTORS |
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| 2024-02-27 | 10-K | 10.16 | KNIFE RIVER 401(K) RETIREMENT PLAN |
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| 2024-02-27 | 10-K | 10.8 | KNIFE RIVER FORM OF PERFORMANCE SHARE AWARD AGREEMENT |
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| 2024-02-27 | 10-K | 10.7 | KNIFE RIVER RESTRICTED STOCK AWARD AGREEMENT |
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| 2023-11-06 | 10-Q | 10.A | KNIFE RIVER RESTRICTIVE STOCK UNIT AWARD AGREEMENT |
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| 2023-08-08 | 10-Q | 10.L | KNIFE RIVER 401K RETIREMENT PLAN |
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| 2023-06-01 | 8-K | 10.11 | Knife River Corporation Deferred Compensation Plan for Directors. |
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| 2023-06-01 | 8-K | 10.10 | Knife River Corporation Director Compensation Policy. |
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| 2023-06-01 | 8-K | 10.9 | Knife River Corporation Nonqualified Defined Contribution Plan.† |
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| 2023-06-01 | 8-K | 10.8 | Knife River Corporation Supplemental Income Security Plan.† |
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| 2023-06-01 | 8-K | 10.7 | Knife River Corporation Deferred Compensation Plan—Plan Document and Adoption Agreement. |
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| 2023-06-01 | 8-K | 10.6 | Knife River Corporation Executive Incentive Compensation Plan, including Rules and Regulations. |
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| 2023-06-01 | 8-K | 10.5 | Knife River Corporation Long Term Performance-Based Incentive Plan. |
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| 2023-06-01 | 8-K | 10.4 | Credit Agreement, dated as of May 31, 2023, by and among Knife River Corporation, JPMorgan Chase Bank, N.A. and Lenders and L/C Issuers party thereto.† |
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| 2023-06-01 | 8-K | 10.3 | Employee Matters Agreement, dated as of May 30, 2023, by and between Knife River Corporation and MDU Resources Group, Inc. |
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| 2023-06-01 | 8-K | 10.2 | Tax Matters Agreement, dated as of May 30, 2023, by and between Knife River Corporation and MDU Resources Group, Inc. |
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| 2023-06-01 | 8-K | 10.1 | Transition Services Agreement, dated as of May 30, 2023, by and between Knife River Corporation and MDU Resources Group, Inc.† |
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| 2023-05-16 | 10-Q | 10.9 | PROMOTION LETTER WITH BRIAN R. GRAY |
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| 2023-05-16 | 10-Q | 10.8 | PROMOTION LETTER WITH TREVOR J. HASTINGS |
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| 2023-05-16 | 10-Q | 10.7 | PROMOTION LETTER WITH KARL A. LIEPITZ |
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| 2023-05-16 | 10-Q | 10.6 | PROMOTION LETTER WITH NANCY K. CHRISTENSON |
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| 2023-05-16 | 10-Q | 10.5 | PROMOTION LETTER WITH GLENN R. PLADSEN |
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| 2023-05-16 | 10-Q | 10.4 | PROMOTION LETTER WITH MARNEY L. KADRMAS |
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| 2023-05-16 | 10-Q | 10.3 | PROMOTION LETTER WITH NATHAN W. RING |
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| 2023-05-16 | 10-Q | 10.2 | PROMOTION LETTER WITH JOHN F. QUADE |
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