ALLIANT ENERGY CORP
For the period ended Dec 31, 2025. Filed Feb 20, 2026.
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FY2025 · Filed Feb 20, 2026
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Signatures
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorized on the 20th day of February 2026.
| ALLIANT ENERGY | INTERSTATE POWER | WISCONSIN POWER |
|---|---|---|
| CORPORATION | AND LIGHT COMPANY | AND LIGHT COMPANY |
| By: /s/ Lisa M. Barton | By: /s/ Lisa M. Barton | By: /s/ Lisa M. Barton |
| Lisa M. Barton | Lisa M. Barton | Lisa M. Barton |
| President and Chief Executive Officer | Chief Executive Officer | Chief Executive Officer |
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrants and in the capacities indicated on the 20th day of February 2026.
| ALLIANT ENERGY | INTERSTATE POWER | WISCONSIN POWER |
|---|---|---|
| CORPORATION | AND LIGHT COMPANY | AND LIGHT COMPANY |
| /s/ Lisa M. Barton | /s/ Lisa M. Barton | /s/ Lisa M. Barton |
| Lisa M. Barton | Lisa M. Barton | Lisa M. Barton |
| President, Chief Executive Officer and Director (Principal Executive Officer) | Chief Executive Officer and Director (Principal Executive Officer) | Chief Executive Officer and Director (Principal Executive Officer) |
| /s/ Robert J. Durian | /s/ Robert J. Durian | /s/ Robert J. Durian |
| Robert J. Durian | Robert J. Durian | Robert J. Durian |
| Executive Vice President and Chief Financial Officer (Principal Financial Officer) | Executive Vice President and Chief Financial Officer (Principal Financial Officer) | Executive Vice President and Chief Financial Officer (Principal Financial Officer) |
| /s/ Dylan M. Syse | /s/ Dylan M. Syse | /s/ Dylan M. Syse |
| Dylan M. Syse | Dylan M. Syse | Dylan M. Syse |
| Chief Accounting Officer and Controller (Principal Accounting Officer) | Chief Accounting Officer and Controller (Principal Accounting Officer) | Chief Accounting Officer and Controller (Principal Accounting Officer) |
| /s/ Patrick E. Allen | /s/ Patrick E. Allen | /s/ Patrick E. Allen |
| Patrick E. Allen, Board Chair and Director | Patrick E. Allen, Board Chair and Director | Patrick E. Allen, Board Chair and Director |
| /s/ Ignacio A. Cortina | /s/ Ignacio A. Cortina | /s/ Ignacio A. Cortina |
| Ignacio A. Cortina, Director | Ignacio A. Cortina, Director | Ignacio A. Cortina, Director |
| /s/ Stephanie L. Cox | /s/ Stephanie L. Cox | /s/ Stephanie L. Cox |
| Stephanie L. Cox, Director | Stephanie L. Cox, Director | Stephanie L. Cox, Director |
| /s/ N. Joy Falotico | /s/ N. Joy Falotico | /s/ N. Joy Falotico |
| N. Joy Falotico, Director | N. Joy Falotico, Director | N. Joy Falotico, Director |
| /s/ Michael D. Garcia | /s/ Michael D. Garcia | /s/ Michael D. Garcia |
| Michael D. Garcia, Director | Michael D. Garcia, Director | Michael D. Garcia, Director |
| /s/ Roger K. Newport | /s/ Roger K. Newport | /s/ Roger K. Newport |
| Roger K. Newport, Director | Roger K. Newport, Director | Roger K. Newport, Director |
| /s/ Thomas F. O’Toole | /s/ Thomas F. O’Toole | /s/ Thomas F. O’Toole |
| Thomas F. O’Toole, Director | Thomas F. O’Toole, Director | Thomas F. O’Toole, Director |
| /s/ Christie Raymond | /s/ Christie Raymond | /s/ Christie Raymond |
| Christie Raymond, Director | Christie Raymond, Director | Christie Raymond, Director |
| /s/ Carol P. Sanders | /s/ Carol P. Sanders | /s/ Carol P. Sanders |
| Carol P. Sanders, Director | Carol P. Sanders, Director | Carol P. Sanders, Director |
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