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Alliant Energy Corp. SEC filings

In the twelve months since 22 September 2025 Alliant Energy Corp. filed 20 documents with the SEC of the kinds listed here: 12 current reports (8-K), about 4 results of operations; 3 other events; 2 material agreement; 2 officer or director change; 1 shareholder vote; 3 quarterly reports (10-Q), 1 employee plan annual report (11-K), 1 annual report to shareholders (ARS), 1 additional proxy material (DEFA14A), 1 proxy statement (DEF 14A), 1 annual report (10-K). The latest, filed 21 August 2026: 8-K, other events.

FiledFormWhat it was aboutPeriod or event dateFiling
21 August 20268-KOther events21 August 2026EDGAR
31 July 202610-Qquarterly report30 June 2026EDGAR
31 July 20268-KResults of operations30 July 2026EDGAR
16 June 202611-Kemployee plan annual report31 December 2025EDGAR
21 May 20268-KShareholder vote20 May 2026EDGAR
1 May 202610-Qquarterly report31 March 2026EDGAR
1 May 20268-KResults of operations30 April 2026EDGAR
31 March 2026ARSannual report to shareholders31 December 2025EDGAR
31 March 2026DEFA14Aadditional proxy materialEDGAR
31 March 2026DEF 14Aproxy statement20 May 2026EDGAR
19 March 20268-KMaterial agreement19 March 2026EDGAR
4 March 20268-KMaterial agreement, New financial obligation2 March 2026EDGAR
20 February 202610-Kannual report31 December 2025EDGAR
20 February 20268-KResults of operations19 February 2026EDGAR
8 January 20268-KOfficer or director change5 January 2026EDGAR
16 December 20258-KOfficer or director change10 December 2025EDGAR
5 December 20258-KOther events2 December 2025EDGAR
7 November 202510-Qquarterly report30 September 2025EDGAR
7 November 20258-KResults of operations6 November 2025EDGAR
26 September 20258-KOther events23 September 2025EDGAR

An 8-K is what a company files within four business days of a material event; the SEC numbers the events, and the words here are the SEC's own headings, shortened. Form 4, Form 144, 13F and Schedule 13D and 13G have their own pages. Prospectus supplements and correspondence are not listed.

Source

The company's filing index on EDGAR, read from the SEC's submissions feed.

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