KNIFE RIVER CORPORATION REPORTS FIRST QUARTER 2026 FINANCIAL RESULTS BISMARCK, N.D. — May 5, 2026 — Knife River Corporation (NYSE: KNF), an aggregates-based, vertically integrated construction materials and contracting services company, today announced financial results for the first quarter ended March 31, 2026. PERFORMANCE SUMMARY | Three Months Ended March 31, | | | | | | | --- | --- | --- | --- | --- | --- | | (In millions, except per share) | | 2026 | | 2025 | % Change | | Revenue | $| 410.1 |$ | 353 ...