X0508 4 2026-02-17 0000067716 MDU RESOURCES GROUP INC MDU 0001718179 Sievert Stephanie A 1200 WEST CENTURY AVENUE BISMARCK ND 58503 1 ChiefAccntg&RegAffairsOfficer 0 Common Stock 2026-02-17 4 A 0 4544.0000 0.0000 A 100941.0510 D Common Stock 2026-02-18 4 F 0 10438.0000 20.3600 D 90503.0510 D Common Stock 27.5770 I By Custodian Common Stock - 401(k) 2238.1404 I By Trustee Represents restricted stock units (RSUs) that will vest on December 31, 2028, subject to the reporting person's continued employment through the vesting date. Includes (a) Common Stock, including 15,633 net shares, which vested on December 31, 2025; and (b) shares of Common Stock acquired through dividend reinvestment since the reporting person's most recent Form 4. Shares withheld in payment of tax liability in connection with the vesting of a previously reported award of RSUs, which vested December 31, 2025. Price is equal to the closing price of a share of Common Stock on February 18, 2026. These shares are held in the name of the reporting person's child. The reporting person disclaims beneficial ownership of these securities, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose, except to the extent of his pecuniary interest. Anthony D. Foti, Attorney-in-Fact for Stephanie A. Sievert 2026-02-19