Shareholder Vote

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 17, 2024 Name of Registrant, State of Incorporation, Address of Principal Executive Offices, Telephone Number, Commission File Number, IRS Employer Identification Number ALLIANT ENERGY CORP ORATION (a Wisconsin corporation) 4902 N. Biltmore Lane Madison , Wisconsin 53718 Telephone ( 608 ) 458-3311 Commission File Number - 1-9894 IRS Employer Identification Number - 39-1380265 Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Alliant Energy Corporation, Common Stock, $0.01 Par Value , Trading Symbol LNT , Nasdaq Global Select Market Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 5.07      Submission of Matters to a Vote of Security Holders. The final results of voting on each of the matters submitted to a vote of shareowners during the annual meeting of shareowners of Alliant Energy Corporation (“AEC”) on May 17, 2024 are as follows. 1. Election of directors. Each nominee for director was elected by the following vote: For Against Abstain Broker Non-Votes For a term ending in 2025 Christie Raymond 197,132,914 1,594,042 391,000 25,109,598 For a term ending in 2026 Ignacio Cortina 197,175,001 1,508,179 434,776 25,109,598 For a term ending in 2027 Lisa Barton 196,796,663 1,961,940 359,353 25,109,598 Stephanie Cox 194,190,395 4,511,369 416,192 25,109,598 Roger Newport 194,337,700 4,352,861 427,395 25,109,598 Carol Sanders 183,111,713 15,607,363 398,880 25,109,598 2. Approve, on an advisory, non-binding basis, the compensation of our named executive officers. This matter was approved by the following vote: For Against Abstain Broker Non-Votes 189,645,167 8,498,044 974,745 25,109,598 3. Ratify the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for 2024. This matter was approved by the following vote: For Against Abstain 218,456,446 5,337,649 433,459 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, Alliant Energy Corporation has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ALLIANT ENERGY CORPORATION Date: May 20, 2024 By: /s/ Omar N. Chaudhary Omar N. Chaudhary Corporate Secretary