MDU Resources Reports 2025 Year-End Results; Initiates 2026 Guidance BISMARCK, ND – Feb. 5, 2026 – MDU Resources Group, Inc. (NYSE: MDU) today announced its financial results for 2025, reflecting continued execution of the company's strategy as a pure-play regulated energy delivery business. During 2025, the company advanced significant infrastructure investments, achieved customer growth across its electric and natural gas utilities, and benefited from key pipeline expansion projects recently placed into s ...