MGE Energy: Departure Of Directors Or Certain Officers; Election Of Directors; Appointment Of Certain Officers; Compensatory Arrangements Of Certain Officers, Financial Statements And Exhibits

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On April 17, 2026, the Boards of Directors of MGE Energy, Inc. (“MGE Energy”) and Madison Gas and Electric Company (“MGE”) promoted Jared Bushek, the Vice President – Chief Financial Officer and Treasurer of both MGE Energy and MGE, to the position of Executive Vice President – Chief Financial Officer and Treasurer of both MGE Energy and MGE, effective as of May 1, 2026. In connection with his promotion, Mr. Bushek was granted a one-time retention award in the form of restricted stock units under MGE Energy’s 2021 Long-Term Incentive Plan with respect to 25,000 shares of MGE Energy’s common stock. To support retention of Mr. Bushek, the retention award is scheduled to cliff vest on the fifth anniversary of the grant date, subject to Mr. Bushek’s continued employment through such date, subject to earlier vesting in the event of Mr. Bushek’s death, disability or termination without cause or resignation for good reason within 24 months following a change in control of MGE Energy. Item 9.01. Financial Statements and Exhibits.(d) Exhibits. Exhibit No. Description 104 Cover Page Interactive Data File (the cover page XBRL tags are embedded in the Inline XBRL document). 2 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned hereunto duly authorized. MGE Energy, Inc.Madison Gas and Electric Company (Registrants) Date: April 21, 2026 /s/ Jenny L. Lagerwall Jenny L. LagerwallAssistant Vice President - Accounting and Controller(Chief Accounting Officer) 3

MGE Energy: Departure Of Directors Or Certain Officers; Election Of Directors; Appointment Of Certain Officers; Compensatory Arrangements Of Certain Officers, Financial Statements And Exhibits

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