ALLIANT ENERGY CORP

For the period ended Jun 30, 2025. Filed Aug 8, 2025.

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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.

Jun 30, 2025 · Filed Aug 8, 2025

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 8th day of August 2025.

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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