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 23, 2023 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 23, 2023 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 2024 Stephanie L. Cox 188,432,521 1,274,882 449,734 25,325,105 For a term ending in 2026 Patrick E. Allen 173,063,970 16,672,609 420,558 25,325,105 Michael D. Garcia 187,565,087 2,153,954 438,096 25,325,105 Susan D. Whiting 187,097,567 2,677,445 382,125 25,325,105 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 181,184,866 7,956,109 1,016,162 25,325,105 3. Advisory vote on the frequency of the advisory vote on the compensation of our named executive officers. One Year was chosen by the following vote: 1 Year 2 Years 3 Years Abstain Broker Non-Votes 186,253,391 938,356 2,204,601 760,789 25,325,105 In light of these voting results and other factors, AEC decided to hold annual advisory votes on the compensation of its named executive officers until the next vote on the frequency of such votes. A vote on the frequency of the advisory vote on compensation of its named executive officers is required at least once every six years. 4. Ratify the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for 2023. This matter was approved by the following vote: For Against Abstain 209,098,452 5,731,229 652,561 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 25, 2023 By: /s/ Robert J. Durian Robert J. Durian Executive Vice President and Chief Financial Officer