ALLIANT ENERGY CORP

For the period ended Mar 31, 2026. Filed May 1, 2026.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 1, 2026

LNT$73.46+1.1%Stored close · as of Nov 9, 2026

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Contents

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 thereunto duly authorized on the 1st day of May 2026.

ALLIANT ENERGY CORPORATION
Registrant
By: /s/ Dylan M. Syse	Chief Accounting Officer and Controller
Dylan M. Syse	(Principal Accounting Officer and Authorized Signatory)

INTERSTATE POWER AND LIGHT COMPANY
Registrant
By: /s/ Dylan M. Syse	Chief Accounting Officer and Controller
Dylan M. Syse	(Principal Accounting Officer and Authorized Signatory)

WISCONSIN POWER AND LIGHT COMPANY
Registrant
By: /s/ Dylan M. Syse	Chief Accounting Officer and Controller
Dylan M. Syse	(Principal Accounting Officer and Authorized Signatory)

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