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
Date of Report (Date of earliest event reported) January 5, 2026
Name of Registrant, State of Incorporation, Address of Principal Executive Offices, Telephone Number, Commission File Number, IRS Employer Identification Number
(a Wisconsin Corporation)
Telephone (608 ) 458-3311
Commission File Number - 1-9894
IRS Employer Identification Number - 39-1380265
(an Iowa corporation)
Telephone (319 ) 786-4411
Commission File Number - 1-4117
IRS Employer Identification Number - 42-0331370
(a Wisconsin corporation)
Telephone (608 ) 458-3311
Commission File Number - 0-337
IRS Employer Identification Number - 39-0714890
(Former name or former address, if changed since last report.)
This combined Form 8-K is separately filed by Alliant Energy Corporation, Interstate Power and Light Company and Wisconsin Power and Light Company.
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:
Securities registered pursuant to Section 12(b) of the Act:
Alliant Energy Corporation, Common Stock, $0.01 Par Value , Trading Symbol LNT , Nasdaq Global Select 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).
Alliant Energy Corporation - Emerging growth company ☐
Interstate Power and Light Company - Emerging growth company ☐
Wisconsin Power and Light Company - Emerging growth 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.
Alliant Energy Corporation ☐
Interstate Power and Light Company ☐
Wisconsin Power and Light Company ☐
Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On January 5, 2026, the Boards of Directors (the “Boards”) of Alliant Energy Corporation (“Alliant Energy”), Interstate Power and Light Company and Wisconsin Power and Light Company increased the number of directors on the Boards to 11 and appointed Manu Asthana as a member of the Boards effective February 23, 2026. Mr. Asthana, 52, was President and Chief Executive Officer of PJM Interconnection from 2020 to 2025. PJM Interconnection oversees the largest power grid in North America and one of the largest electricity markets in the world, serving 67 million people in 13 states and the District of Columbia. Prior to that, he held roles of increasing importance with accountabilities related to financial performance, risk, and operations at public and private utility companies. Mr. Asthana will stand for election at the Alliant Energy 2026 Annual Meeting of Shareowners as a nominee for director to serve until Alliant Energy’s 2029 Annual Meeting of Shareowners, along with the three directors whose terms expire at the 2026 Annual Meeting of Shareowners.
Effective February 23, 2026, Mr. Asthana will serve as a member of the Audit Committee and the Operations Committee of each Board. He will receive compensation as a non-employee director in accordance with the non-employee director compensation practices described in Alliant Energy’s Definitive Proxy Statement filed with the Securities and Exchange Commission on April 1, 2025, except that for 2026 Board service, the annual retainer for service on all Boards will be $300,000.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, Alliant Energy Corporation, Interstate Power and Light Company and Wisconsin Power and Light Company have each duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
| ALLIANT ENERGY CORPORATION | |||||
| Date: January 8, 2026 | By:/s/ Omar N. Chaudhary | ||||
| Omar N. Chaudhary | |||||
| Corporate Secretary | |||||
| INTERSTATE POWER AND LIGHT COMPANY | |||||
| Date: January 8, 2026 | By:/s/ Omar N. Chaudhary | ||||
| Omar N. Chaudhary | |||||
| Corporate Secretary | |||||
| WISCONSIN POWER AND LIGHT COMPANY | |||||
| Date: January 8, 2026 | By:/s/ Omar N. Chaudhary | ||||
| Omar N. Chaudhary | |||||
| Corporate Secretary | |||||