LNT: Financial results

Item 2.02 Results of Operations and Financial Condition. On July 30, 2026, Alliant Energy Corporation issued a press release announcing its financial results for the three and six months ended June 30, 2026. A copy of such press release is furnished as Exhibit 99.1 and is incorporated by reference herein. Item 9.01 Financial Statements and Exhibits. (a) Not applicable. (b) Not applicable. (c) Not applicable. (d) Exhibits . The following exhibits are being furnished herewith: Exhibit Number Description (99.1) Alliant Energy Corporation press release dated July 30, 2026 (104) Cover Page Interactive Data File (embedded within the Inline XBRL document) SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned hereunto duly authorized. ALLIANT ENERGY CORPORATION Date: July 30, 2026 By: /s/ Dylan M. Syse Dylan M. Syse Chief Accounting Officer and Controller INTERSTATE POWER AND LIGHT COMPANY Date: July 30, 2026 By: /s/ Dylan M. Syse Dylan M. Syse Chief Accounting Officer and Controller WISCONSIN POWER AND LIGHT COMPANY Date: July 30, 2026 By: /s/ Dylan M. Syse Dylan M. Syse Chief Accounting Officer and Controller