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MADISON GAS & ELECTRIC CO

For the period ended Nov 4, 2026. Filed Nov 4, 2026.

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About this filing

A notice of a major event between regular reports, such as results, a deal or a change of executives. It is often the first formal record of the news.

Nov 4, 2026 · Filed Nov 4, 2026

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MGEE$80.26+2.4%Stored close · as of Nov 6, 2026
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UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549
November 4, 2026Date of report (date of earliest event reported)
CommissionFile No.Name of Registrant, State of Incorporation, Addressof Principal Executive Offices, and Telephone No.IRS EmployerIdentification No.
000-49965MGE Energy, Inc.(a Wisconsin Corporation)133 South Blair StreetMadison, Wisconsin 53788(608) 252-7000 | mgeenergy.com39-2040501
000-1125Madison Gas and Electric Company(a Wisconsin Corporation)133 South Blair StreetMadison, Wisconsin 53788(608) 252-7000 | mge.com39-0444025

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading symbol(s)Name of each exchange on which registered
Common Stock, $1 Par Value Per ShareMGEEThe NASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

MGE Energy, Inc. ☐ Madison Gas and Electric Company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

MGE Energy, Inc. ☐Madison Gas and Electric Company ☐

On November 4, 2026, MGE Energy, Inc. (the Company) issued a press release announcing its third quarter 2026 earnings. The Company is furnishing a copy of that press release as Exhibit 99.1 to this report.

This combined Form 8-K is being furnished separately by the Company and Madison Gas and Electric Company. Information contained herein relating to any individual registrant has been furnished by such registrant on its own behalf. Neither registrant makes any representation as to information relating to the other registrant.

(a) Financial statements of businesses acquired: None

(b) Pro forma financial information: None

(c) Shell company transactions: None

(d) Exhibits.

Exhibit No.Description
99.1Press release of MGE Energy, Inc., issued on November 4, 2026.
104Cover Page Interactive Data File (the cover page XBRL tags are embedded in the Inline XBRL document).

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: November 4, 2026/s/ Jenny L. Lagerwall
Jenny L. LagerwallAssistant Vice President - Accounting and Controller(Chief Accounting Officer)
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