Alliant Energy Corp SEC filings LNT
Alliant Energy Corp has 1,000 filings in SEC EDGAR's recent list, going back to Jan 31, 2014. Its latest annual report, Form ARS, was filed on Mar 31, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 30, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 30, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Results of operations
|
Oct 30, 2026 | Oct 29, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 28, 2026 | Oct 26, 2026 |
| 8-K |
Current report
Other events
|
Aug 21, 2026 | Aug 21, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2026 | Jul 30, 2026 |
| 8-K |
Current report
Shareholder vote results
|
May 21, 2026 | May 20, 2026 |
| 8-K |
Current report
Results of operations
|
May 1, 2026 | Apr 30, 2026 |
| 8-K |
Current report
Material agreement
|
Mar 19, 2026 | Mar 19, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 4, 2026 | Mar 2, 2026 |
| 8-K |
Current report
Results of operations
|
Feb 20, 2026 | Feb 19, 2026 |
| 8-K |
Current report
Officer or director change
|
Jan 8, 2026 | Jan 5, 2026 |
| 8-K |
Current report
Officer or director change
|
Dec 16, 2025 | Dec 10, 2025 |
| 8-K |
Current report
Other events
|
Dec 5, 2025 | Dec 2, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2025 | Nov 6, 2025 |
| 8-K |
Current report
Other events
|
Sep 26, 2025 | Sep 23, 2025 |
| 8-K |
Current report
Other events
|
Sep 11, 2025 | Sep 8, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2025 | Aug 7, 2025 |
| 8-K |
Current report
Shareholder vote results
|
May 20, 2025 | May 16, 2025 |
| 8-K |
Current report
Other events
|
May 19, 2025 | May 13, 2025 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
May 15, 2025 | May 12, 2025 |
| 8-K |
Current report
Material agreement
|
May 9, 2025 | May 9, 2025 |
| 8-K |
Current report
Results of operations
|
May 9, 2025 | May 8, 2025 |
| 8-K |
Current report
Officer or director change
|
Mar 10, 2025 | Mar 7, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 3, 2025 | Mar 3, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 21, 2025 | Feb 20, 2025 |
| 8-K |
Current report
Officer or director change
|
Feb 11, 2025 | Feb 7, 2025 |
| 8-K |
Current report
New debt
|
Dec 18, 2024 | Dec 18, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 1, 2024 | Oct 31, 2024 |
| 8-K |
Current report
Other events
|
Sep 6, 2024 | Sep 4, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2024 | Aug 1, 2024 |
| 8-K | Current report | Jul 26, 2024 | Jul 22, 2024 |
| 8-K |
Current report
Officer or director change
|
Jul 15, 2024 | Jul 10, 2024 |
| 8-K |
Current report
Impairment
|
Jun 24, 2024 | Jun 20, 2024 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Jun 6, 2024 | Jun 3, 2024 |
| 8-K |
Current report
Shareholder vote results
|
May 20, 2024 | May 17, 2024 |
| 8-K |
Current report
Results of operations
|
May 3, 2024 | May 2, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 8, 2024 | Mar 7, 2024 |
| 8-K |
Current report
Other events
|
Mar 7, 2024 | Mar 4, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 5, 2024 | Mar 1, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 16, 2024 | Feb 15, 2024 |
| 8-K |
Current report
Officer or director change
|
Feb 13, 2024 | Feb 8, 2024 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Nov 13, 2023 | Nov 7, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2023 | Nov 2, 2023 |
| 8-K |
Current report
Officer or director change
|
Oct 26, 2023 | Oct 25, 2023 |
| 8-K |
Current report
Other events
|
Sep 21, 2023 | Sep 18, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2023 | Aug 3, 2023 |
| 8-K |
Current report
Officer or director change
|
Jul 14, 2023 | Jul 11, 2023 |
| 8-K |
Current report
Shareholder vote results
|
May 25, 2023 | May 23, 2023 |
| 8-K |
Current report
Results of operations
|
May 5, 2023 | May 4, 2023 |
| 8-K |
Current report
Other events
|
Mar 30, 2023 | Mar 27, 2023 |
| 8-K |
Current report
New debt
|
Mar 16, 2023 | Mar 15, 2023 |
| 8-K |
Current report
New debt, Unregistered share sale
|
Mar 13, 2023 | Mar 10, 2023 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
Mar 3, 2023 | Feb 27, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2023 | Feb 23, 2023 |
| 8-K |
Current report
Officer or director change
|
Jan 13, 2023 | Jan 13, 2023 |
| 8-K |
Current report
Officer or director change
|
Jan 4, 2023 | Jan 4, 2023 |
| 8-K |
Current report
Material agreement
|
Dec 15, 2022 | Dec 14, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Other events
|
Aug 15, 2022 | Aug 8, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2022 | Aug 4, 2022 |
| 8-K |
Current report
Shareholder vote results
|
May 24, 2022 | May 19, 2022 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2022 | Apr 28, 2022 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 4, 2022 | Mar 3, 2022 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Mar 1, 2022 | Feb 23, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 18, 2022 | Feb 17, 2022 |
| 8-K |
Current report
Officer or director change
|
Feb 8, 2022 | Feb 4, 2022 |
| 8-K |
Current report
New debt, Bylaw or fiscal year change
|
Dec 21, 2021 | Dec 17, 2021 |
| 8-K |
Current report
Other events
|
Nov 19, 2021 | Nov 16, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2021 | Nov 4, 2021 |
| 8-K |
Current report
Other events
|
Nov 4, 2021 | Nov 3, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 28, 2021 | Oct 26, 2021 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Sep 24, 2021 | Sep 23, 2021 |
| 8-K |
Current report
Other events
|
Sep 16, 2021 | Sep 13, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2021 | Aug 5, 2021 |
| 8-K |
Current report
Officer or director change
|
Jul 15, 2021 | Jul 14, 2021 |
| 8-K |
Current report
Shareholder vote results
|
May 25, 2021 | May 20, 2021 |
| 8-K |
Current report
Results of operations
|
May 7, 2021 | May 6, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 19, 2021 | Feb 18, 2021 |
| 8-K |
Current report
Officer or director change
|
Jan 29, 2021 | Jan 27, 2021 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Nov 23, 2020 | Nov 17, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2020 | Nov 2, 2020 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Oct 29, 2020 | Oct 27, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 19, 2020 | Aug 18, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2020 | Aug 6, 2020 |
| 8-K |
Current report
Other events
|
Jun 2, 2020 | May 26, 2020 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 22, 2020 | May 21, 2020 |
| 8-K |
Current report
Results of operations
|
May 8, 2020 | May 7, 2020 |
| 8-K |
Current report
Results of operations
|
Apr 6, 2020 | Apr 3, 2020 |
| 8-K |
Current report
Other events
|
Apr 2, 2020 | Mar 30, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Mar 5, 2020 | Mar 3, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 21, 2020 | Feb 20, 2020 |
| 8-K |
Current report
Officer or director change
|
Dec 13, 2019 | Dec 12, 2019 |
| 8-K |
Current report
Material agreement, Other events
|
Nov 18, 2019 | Nov 14, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2019 | Nov 6, 2019 |
| 8-K |
Current report
Other events
|
Sep 26, 2019 | Sep 19, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2019 | Aug 1, 2019 |
| 8-K |
Current report
Other events
|
Jun 24, 2019 | Jun 17, 2019 |
| 8-K |
Current report
Shareholder vote results
|
May 20, 2019 | May 16, 2019 |
| 8-K |
Current report
Results of operations
|
May 3, 2019 | May 2, 2019 |
| 8-K |
Current report
Other events
|
Apr 1, 2019 | Mar 25, 2019 |
| 8-K |
Current report
Results of operations
|
Feb 22, 2019 | Feb 21, 2019 |
| 8-K |
Current report
Officer or director change
|
Feb 13, 2019 | Feb 11, 2019 |
| 8-K |
Current report
Listing notice, Bylaw or fiscal year change, Other events
|
Dec 18, 2018 | Dec 13, 2018 |
| 8-K |
Current report
Material agreement, Other events
|
Dec 17, 2018 | Dec 13, 2018 |
| 8-K |
Current report
Officer or director change
|
Dec 13, 2018 | Dec 13, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2018 | Nov 6, 2018 |
| 8-K |
Current report
Other events
|
Sep 26, 2018 | Sep 19, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2018 | Aug 2, 2018 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change
|
Jul 26, 2018 | Jul 25, 2018 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Jun 12, 2018 | Jun 6, 2018 |
| 8-K |
Current report
Shareholder vote results
|
May 21, 2018 | May 17, 2018 |
| 8-K |
Current report
Material agreement
|
May 21, 2018 | May 18, 2018 |
| 8-K |
Current report
Results of operations
|
May 3, 2018 | May 2, 2018 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 30, 2018 | Apr 26, 2018 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change
|
Mar 15, 2018 | Mar 9, 2018 |
| 8-K |
Current report
Results of operations
|
Feb 22, 2018 | Feb 22, 2018 |
| 8-K |
Current report
Change to shareholder rights
|
Jan 18, 2018 | Jan 15, 2018 |
| 8-K |
Current report
Officer or director change
|
Dec 11, 2017 | Dec 7, 2017 |
| 8-K |
Current report
Other events
|
Nov 15, 2017 | Nov 9, 2017 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2017 | Nov 2, 2017 |
| 8-K |
Current report
Other events
|
Oct 10, 2017 | Oct 2, 2017 |
| 8-K |
Current report
New debt
|
Aug 21, 2017 | Aug 16, 2017 |
| 8-K |
Current report
Officer or director change
|
Aug 8, 2017 | Aug 7, 2017 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2017 | Aug 3, 2017 |
| 8-K |
Current report
Shareholder vote results
|
May 25, 2017 | May 23, 2017 |
| 8-K |
Current report
Material agreement
|
May 9, 2017 | May 9, 2017 |
| 8-K |
Current report
Results of operations
|
May 4, 2017 | May 3, 2017 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2017 | Feb 23, 2017 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2016 | Nov 3, 2016 |
| 8-K |
Current report
Results of operations
|
Oct 21, 2016 | Oct 21, 2016 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 7, 2016 | Oct 7, 2016 |
| 8-K |
Current report
Officer or director change
|
Sep 23, 2016 | Sep 22, 2016 |
| 8-K |
Current report
Other events
|
Sep 15, 2016 | Sep 12, 2016 |
| 8-K |
Current report
Results of operations
|
Aug 2, 2016 | Aug 1, 2016 |
| 8-K |
Current report
Shareholder vote results
|
May 19, 2016 | May 19, 2016 |
| 8-K |
Current report
Results of operations
|
May 5, 2016 | May 4, 2016 |
| 8-K |
Current report
Results of operations
|
Feb 23, 2016 | Feb 22, 2016 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2015 | Nov 5, 2015 |
| 8-K |
Current report
Officer or director change
|
Sep 24, 2015 | Sep 21, 2015 |
| 8-K |
Current report
Other events
|
Aug 18, 2015 | Aug 13, 2015 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2015 | Jul 31, 2015 |
| 8-K |
Current report
Officer or director change
|
Jul 27, 2015 | Jul 27, 2015 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
May 13, 2015 | May 7, 2015 |
| 8-K |
Current report
Results of operations
|
May 1, 2015 | Apr 30, 2015 |
| 8-K |
Current report
Material agreement
|
Mar 4, 2015 | Mar 4, 2015 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2015 | Feb 23, 2015 |
| 8-K |
Current report
Officer or director change
|
Dec 12, 2014 | Dec 10, 2014 |
| 8-K |
Current report
Other events
|
Nov 24, 2014 | Nov 17, 2014 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2014 | Nov 6, 2014 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 14, 2014 | Oct 7, 2014 |
| 8-K |
Current report
Other events
|
Oct 14, 2014 | Oct 6, 2014 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2014 | Aug 6, 2014 |
| 8-K |
Current report
Shareholder vote results
|
May 16, 2014 | May 13, 2014 |
| 8-K |
Current report
Results of operations
|
May 2, 2014 | May 1, 2014 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 1, 2014 | Apr 1, 2014 |
| 8-K |
Current report
Officer or director change
|
Mar 12, 2014 | Mar 12, 2014 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2014 | Feb 25, 2014 |
| 8-K |
Current report
Officer or director change
|
Feb 11, 2014 | Feb 10, 2014 |
Showing 157 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Electric & Other Services Combined (SIC 4931)
- Listed as
- LNT (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- WI
- Headquarters
- Madison, WI
- SEC filer status
- Large accelerated filer
- SEC CIK
- 352541
- Former names
- ALLIANT ENERGY CORP (until Oct 30, 2026); INTERSTATE ENERGY CORP (until May 13, 1999); WPL HOLDINGS INC (until Feb 23, 1998)
Other Electric & Other Services Combined companies
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.