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ALLIANT ENERGY CORP — 424B5 Filings

16 424B5 filings on record

This page lists all 424B5 filings submitted to the SEC by ALLIANT ENERGY CORP (LNT), sorted by most recent first. Each row links to the full filing on EdgarLookup. ALLIANT ENERGY CORP has filed 16 424B5 documents with the SEC since 2013. To view all SEC filings by ALLIANT ENERGY CORP, see the full filings list.

Overview All Filings Financials Insiders
All 10-K 10-K/A 10-K405 10-K405/A 10-Q 10-Q/A 11-K 15-15D 25 3 3/A 35-CERT 35-CERT/A 4 4/A 424B2 424B3 424B5 5 5/A 8-A12B 8-A12B/A 8-K 8-K/A ARS CERT CORRESP CT ORDER DEF 14A DEFA14A FWP NO ACT NT 10-K NT 11-K POS AMC POSASR PRE 14A PX14A6G RW S-3 S-3/A S-3ASR S-3D S-3MEF S-4 S-4/A S-8 S-8 POS SC 13D SC 13D/A SC 13G SC 13G/A SCHEDULE 13G/A SE U-1 U-1/A U-12-IB U-13-60 U-57 U-6B-2 U-6B-2/A U-9C-3 U5A U5B U5B/A U5S U5S/A UPLOAD
Form Description Accession Number Filed Period
424B5 424B5 0001193125-26-116238 Mar 19, 2026
424B5 424B5 0001193125-25-216952 Sep 25, 2025
424B5 424B5 0001193125-25-212360 Sep 23, 2025
424B5 424B5 0001193125-25-116988 May 9, 2025
424B5 424B5 0001193125-22-304961 Dec 15, 2022
424B5 424B5 0001193125-19-291652 Nov 14, 2019
424B5 424B5 0001193125-18-348851 Dec 13, 2018
424B5 424B5 0001193125-18-168293 May 21, 2018
424B5 424B5 0001193125-17-164381 May 9, 2017
424B5 424B5 0001193125-15-076990 Mar 4, 2015
424B5 FINAL PROSPECTUS SUPPLEMENT WITH BASE PROSPECTUS 0001193125-09-201764 Oct 1, 2009
424B5 PRELIMINARY PROSPECTUS SUPPLEMENT WITH BASE PROSPECTUS 0001193125-09-200769 Sep 30, 2009
424B5 FINAL PROSPECTUS SUPPLEMENT 0001193125-03-016615 Jul 3, 2003
424B5 PRO SUPP 0001193125-03-014766 Jun 30, 2003
424B5 FORM 424B5 0000950134-01-508163 Nov 13, 2001
424B5 PROSPECTUS SUPPLEMENT 0000950124-01-503617 Oct 25, 2001