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ALLIANT ENERGY CORP — 10-K Filings

28 10-K filings on record

This page lists all 10-K 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 28 10-K 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
10-K 10-K 0000352541-26-000007 Feb 20, 2026 Dec 31, 2025
10-K 10-K 0000352541-25-000014 Feb 21, 2025 Dec 31, 2024
10-K 10-K 0000352541-24-000014 Feb 16, 2024 Dec 31, 2023
10-K 10-K 0000352541-23-000017 Feb 24, 2023 Dec 31, 2022
10-K 10-K 0000352541-22-000020 Feb 18, 2022 Dec 31, 2021
10-K 10-K 0000352541-21-000022 Feb 19, 2021 Dec 31, 2020
10-K 10-K 0000352541-20-000021 Feb 21, 2020 Dec 31, 2019
10-K 10-K 0000352541-19-000013 Feb 22, 2019 Dec 31, 2018
10-K 10-K 0000352541-18-000019 Feb 23, 2018 Dec 31, 2017
10-K 10-K 0000352541-17-000017 Feb 24, 2017 Dec 31, 2016
10-K 10-K 0000352541-16-000076 Feb 24, 2016 Dec 31, 2015
10-K 10-K 0000352541-15-000005 Feb 25, 2015 Dec 31, 2014
10-K 10-K 0000352541-14-000006 Feb 25, 2014 Dec 31, 2013
10-K FORM 10-K 0000352541-13-000007 Feb 26, 2013 Dec 31, 2012
10-K FORM 10-K 0001193125-12-081622 Feb 27, 2012 Dec 31, 2011
10-K FORM 10-K 0001193125-11-049662 Feb 28, 2011 Dec 31, 2010
10-K FORM 10-K 12/31/09 0000352541-10-000009 Feb 26, 2010 Dec 31, 2009
10-K FORM 10-K 12/31/08 0000107832-09-000001 Feb 27, 2009 Dec 31, 2008
10-K FORM 10-K 12/31/07 0000107832-08-000019 Feb 28, 2008 Dec 31, 2007
10-K FORM 10-K 12/31/06 0000107832-07-000058 Mar 1, 2007 Dec 31, 2006
10-K FORM 10-K 12-31-05 0000107832-06-000055 Mar 3, 2006 Dec 31, 2005
10-K FORM 10-K 12-31-2004 0000107832-05-000069 Mar 4, 2005 Dec 31, 2004
10-K FORM 10-K 12/31/03 0000107832-04-000096 Mar 11, 2004 Dec 31, 2003
10-K FORM 10-K 12/31/02 0000107832-03-000014 Mar 26, 2003 Dec 31, 2002
10-K 1999 10-K 0000107832-00-000027 Mar 29, 2000 Dec 31, 1999
10-K FORM 10-K 0000897069-99-000197 Mar 31, 1999 Dec 31, 1998
10-K WPL HOLDINGS, INC. FORM 10-K 0000897069-95-000018 Mar 14, 1995 Dec 31, 1994
10-K FORM 10-K 0000897069-94-000044 Feb 28, 1994 Dec 31, 1993