KNIFE RIVER CORPORATION REPORTS FIRST QUARTER 2025 FINANCIAL RESULTS Closed on acquisition of Strata Corporation On track for record full-year revenue, net income and adjusted EBITDA Updated full-year 2025 guidance BISMARCK, N.D. — May 6, 2025 — Knife River Corporation (NYSE: KNF), an aggregates-led, vertically integrated construction materials and contracting services company, today announced financial results for the first quarter ended March 31, 2025. PERFORMANCE SUMMARY | | | | | Three Months Ended Marc ...