X0609 4/A 2026-07-09 2026-07-13 0 0001993004 NorthWestern Energy Group, Inc. NWE 0001182496 YAZDI MAHVASH false 3010 W. 69TH STREET SIOUX FALLS SD 57108 1 0 0 0 0 Common Stock 2026-07-09 4 A 0 524 71.62 A 22932 D This Form 4/A amends the Form 4 filed on July 13, 2026, solely to correct the transaction date reported therein. The original filing inadvertently reported the transaction date as July 6, 2026. The correct transaction date was July 9, 2026. No other information has been changed except as necessary to reflect this correction. Third quarter stock grant for 2026 received pursuant to the NorthWestern Energy Group, Inc. compensation rate schedule for non-employee directors. Includes shares acquired from dividend reinvestment. Emily L. Folsom, by power of attorney 2026-07-09