MGEE

8-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

February 24, 2026 Date of report (date of earliest event reported)

Commission File No.

Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No.

IRS Employer Identification No.

000-49965

MGE Energy, Inc. (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mgeenergy.com

39-2040501

000-1125

Madison Gas and Electric Company (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mge.com

39-0444025

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 class

Trading symbol(s)

Name of each exchange on which registered

Common Stock, $1 Par Value Per Share

MGEE

The 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 ☐

1

Item 2.02. Results of Operations and Financial Condition.

On February 24, 2026, MGE Energy, Inc. (the Company) issued a press release announcing its fourth quarter and full year 2025 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.

Item 9.01. Financial Statements and Exhibits.

(a) Financial statements of businesses acquired: None (b) Pro forma financial information: None (c) Shell company transactions: None (d) Exhibits.

Exhibit No.

Description

99.1

Press release of MGE Energy, Inc., issued on February 24, 2026.

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: February 24, 2026

/s/ Jenny L. Lagerwall

Jenny L. Lagerwall Assistant Vice President - Accounting and Controller (Chief Accounting Officer)

3

8-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

November 5, 2025 Date of report (date of earliest event reported)

Commission File No.

Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No.

IRS Employer Identification No.

000-49965

MGE Energy, Inc. (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mgeenergy.com

39-2040501

000-1125

Madison Gas and Electric Company (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mge.com

39-0444025

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 class

Trading symbol(s)

Name of each exchange on which registered

Common Stock, $1 Par Value Per Share

MGEE

The 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 ☐

1

Item 2.02. Results of Operations and Financial Condition.

On November 5, 2025, MGE Energy, Inc. (the Company) issued a press release announcing its third quarter 2025 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.

Item 9.01. Financial Statements and Exhibits.

(a) Financial statements of businesses acquired: None (b) Pro forma financial information: None (c) Shell company transactions: None (d) Exhibits.

Exhibit No.

Description

99.1

Press release of MGE Energy, Inc., issued on November 5, 2025.

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: November 5, 2025

/s/ Jenny L. Lagerwall

Jenny L. Lagerwall Assistant Vice President - Accounting and Controller (Chief Accounting Officer)

3

8-K

false00011617280000061339false0001161728mgee:MgeMember2025-08-062025-08-0600011617282025-08-062025-08-06

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

August 6, 2025 Date of report (date of earliest event reported)

Commission File No.

Name of Registrant, State of Incorporation, Address of Principal Executive Offices, and Telephone No.

IRS Employer Identification No.

000-49965

MGE Energy, Inc. (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mgeenergy.com

39-2040501

000-1125

Madison Gas and Electric Company (a Wisconsin Corporation) 133 South Blair Street Madison, Wisconsin 53788 (608) 252-7000 | mge.com

39-0444025

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 class

Trading symbol(s)

Name of each exchange on which registered

Common Stock, $1 Par Value Per Share

MGEE

The 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 ☐

1

Item 2.02. Results of Operations and Financial Condition.

On August 6, 2025, MGE Energy, Inc. (the Company) issued a press release announcing its second quarter 2025 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.

Item 7.01. Regulation FD Disclosure.

On August 6, 2025, MGE Energy, Inc. posted a financial presentation on its Investor Relations website. A copy of the presentation is attached as Exhibit 99.2. This Form 8-K and the attached exhibits are furnished to, but not filed with, the Securities and Exchange Commission.

Item 9.01. Financial Statements and Exhibits.

(a) Financial statements of businesses acquired: None (b) Pro forma financial information: None (c) Shell company transactions: None (d) Exhibits.

Exhibit No.

Description

99.1

Press release of MGE Energy, Inc., issued on August 6, 2025.

99.2

Presentation Slides.

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: August 6, 2025

/s/ Jenny L. Lagerwall

Jenny L. Lagerwall Assistant Vice President - Accounting and Controller (Chief Accounting Officer)

3