Alliant Energy said John O. Larsen informed its Boards of Directors on March 7, 2025 that he plans to retire as Chairman of the Board and as a member of the Boards when his term expires after the 2025 Annual Meeting of Shareowners.

1. 01

   Alliant Energy said John O. Larsen informed its Boards of Directors on March 7, 2025 that he plans to retire as Chairman of the Board and as a member of the Boards when his term expires after the 2025 Annual Meeting of Shareowners.

2. 02

   The company said the Boards designated Patrick E. Allen as Board Chair of the Companies on March 7, 2025, effective after the 2025 Annual Meeting of Shareowners.

3. 03

   Alliant Energy said Mr. Allen has served as a member of the Boards since 2011.

4. 04

   The company said this Form 8-K is a combined report separately filed by Alliant Energy, Interstate Power and Light Company and Wisconsin Power and Light Company. The change in Board Chair applies to the Boards of all three companies.

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