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 |
|---|---|---|---|
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Oct 14, 2026 | Oct 9, 2026 |
| 4 | Insider transaction | Aug 12, 2026 | Aug 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| 4 | Insider transaction | Jul 14, 2026 | Jul 10, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 28, 2026 | — |
| 4 | Insider transaction | Apr 16, 2026 | Apr 15, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4/A | Form 4/a | Mar 19, 2026 | Feb 19, 2026 |
| 3 | Initial insider ownership | Mar 4, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 4 | Insider transaction | Feb 23, 2026 | Feb 19, 2026 |
| 3 | Initial insider ownership | Jan 15, 2026 | Jan 5, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 12, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Oct 14, 2025 | Oct 10, 2025 |
| 4 | Insider transaction | Oct 14, 2025 | Oct 10, 2025 |
| 4 | Insider transaction | Oct 14, 2025 | Oct 10, 2025 |
| 4 | Insider transaction | Oct 14, 2025 | Oct 10, 2025 |
| 4 | Insider transaction | Oct 14, 2025 | Oct 10, 2025 |
| 4 | Insider transaction | Oct 14, 2025 | Oct 10, 2025 |
| 4 | Insider transaction | Jul 15, 2025 | Jul 11, 2025 |
| 4 | Insider transaction | Jul 15, 2025 | Jul 11, 2025 |
| 4 | Insider transaction | Jul 15, 2025 | Jul 11, 2025 |
| 4 | Insider transaction | Jul 15, 2025 | Jul 11, 2025 |
| 4 | Insider transaction | Jul 15, 2025 | Jul 11, 2025 |
| 4 | Insider transaction | Jul 15, 2025 | Jul 11, 2025 |
| 4 | Insider transaction | Apr 16, 2025 | Apr 15, 2025 |
| 3 | Initial insider ownership | Apr 16, 2025 | Apr 7, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 11, 2025 |
| 3 | Initial insider ownership | Mar 12, 2025 | Mar 2, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Jan 14, 2025 | Jan 10, 2025 |
| 4 | Insider transaction | Jan 14, 2025 | Jan 10, 2025 |
| 4 | Insider transaction | Jan 14, 2025 | Jan 10, 2025 |
| 4 | Insider transaction | Jan 14, 2025 | Jan 10, 2025 |
| 4 | Insider transaction | Jan 14, 2025 | Jan 10, 2025 |
| 4 | Insider transaction | Jan 14, 2025 | Jan 10, 2025 |
| 4 | Insider transaction | Nov 20, 2024 | Nov 20, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 16, 2024 | — |
| 4 | Insider transaction | Oct 15, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Oct 15, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Oct 15, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Oct 15, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Oct 15, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Oct 15, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Oct 15, 2024 | Oct 11, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 12, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 12, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 12, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 12, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 12, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 12, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 12, 2024 |
| 4 | Insider transaction | May 9, 2024 | May 7, 2024 |
| 4 | Insider transaction | May 9, 2024 | May 7, 2024 |
| 3 | Initial insider ownership | May 9, 2024 | May 1, 2024 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 12, 2024 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 12, 2024 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 12, 2024 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 12, 2024 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 12, 2024 |
| 4 | Insider transaction | Apr 16, 2024 | Apr 12, 2024 |
| 3 | Initial insider ownership | Apr 1, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| 4 | Insider transaction | Feb 20, 2024 | Feb 15, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 30, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 24, 2024 | — |
| 4 | Insider transaction | Jan 17, 2024 | Jan 12, 2024 |
| 4 | Insider transaction | Jan 17, 2024 | Jan 12, 2024 |
| 4 | Insider transaction | Jan 17, 2024 | Jan 12, 2024 |
| 4 | Insider transaction | Jan 17, 2024 | Jan 12, 2024 |
| 4 | Insider transaction | Jan 17, 2024 | Jan 12, 2024 |
| 4 | Insider transaction | Jan 17, 2024 | Jan 12, 2024 |
| 4 | Insider transaction | Dec 11, 2023 | Dec 7, 2023 |
| 4 | Insider transaction | Oct 17, 2023 | Oct 13, 2023 |
| 4 | Insider transaction | Oct 17, 2023 | Oct 13, 2023 |
| 4 | Insider transaction | Oct 17, 2023 | Oct 13, 2023 |
| 4 | Insider transaction | Oct 17, 2023 | Oct 13, 2023 |
| 4 | Insider transaction | Oct 17, 2023 | Oct 13, 2023 |
| 4 | Insider transaction | Aug 9, 2023 | Aug 8, 2023 |
| 3 | Initial insider ownership | Jul 19, 2023 | Jul 14, 2023 |
| 4 | Insider transaction | Jul 13, 2023 | Jul 11, 2023 |
| 4 | Insider transaction | Jul 13, 2023 | Jul 11, 2023 |
| 4 | Insider transaction | Jul 13, 2023 | Jul 11, 2023 |
| 4 | Insider transaction | Jul 13, 2023 | Jul 11, 2023 |
| 4 | Insider transaction | Jul 13, 2023 | Jul 11, 2023 |
| 4 | Insider transaction | Jul 13, 2023 | Jul 11, 2023 |
| 4 | Insider transaction | Jun 14, 2023 | Jun 12, 2023 |
| 3 | Initial insider ownership | Jun 14, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 23, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 23, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 23, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 23, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 23, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 23, 2023 |
| 4 | Insider transaction | Feb 27, 2023 | Feb 27, 2023 |
| 3 | Initial insider ownership | Feb 27, 2023 | Feb 27, 2023 |
| 3 | Initial insider ownership | Feb 14, 2023 | Feb 11, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 8, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 27, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2023 | — |
| 4 | Insider transaction | Jan 11, 2023 | Jan 9, 2023 |
| 4 | Insider transaction | Jan 11, 2023 | Jan 9, 2023 |
| 4 | Insider transaction | Jan 11, 2023 | Jan 9, 2023 |
| 4 | Insider transaction | Jan 11, 2023 | Jan 9, 2023 |
| 4 | Insider transaction | Jan 11, 2023 | Jan 9, 2023 |
| 4 | Insider transaction | Dec 20, 2022 | Aug 18, 2022 |
| 4 | Insider transaction | Oct 13, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Oct 13, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Oct 13, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Oct 13, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Oct 13, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Oct 13, 2022 | Oct 11, 2022 |
| 4 | Insider transaction | Jul 13, 2022 | Jul 11, 2022 |
| 4 | Insider transaction | Jul 13, 2022 | Jul 11, 2022 |
| 4 | Insider transaction | Jul 13, 2022 | Jul 11, 2022 |
| 4 | Insider transaction | Jul 13, 2022 | Jul 11, 2022 |
| 4 | Insider transaction | Jul 13, 2022 | Jul 11, 2022 |
| 4 | Insider transaction | Jul 13, 2022 | Jul 11, 2022 |
| 4 | Insider transaction | Jun 13, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Apr 14, 2022 | Apr 13, 2022 |
| 4 | Insider transaction | Apr 14, 2022 | Apr 13, 2022 |
| 4 | Insider transaction | Apr 14, 2022 | Apr 13, 2022 |
| 4 | Insider transaction | Apr 14, 2022 | Apr 13, 2022 |
| 4 | Insider transaction | Apr 14, 2022 | Apr 13, 2022 |
| 4 | Insider transaction | Apr 14, 2022 | Apr 13, 2022 |
| 4 | Insider transaction | Apr 12, 2022 | Apr 11, 2022 |
| 3 | Initial insider ownership | Apr 11, 2022 | Apr 11, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Mar 1, 2022 | Feb 25, 2022 |
| 4 | Insider transaction | Feb 22, 2022 | Feb 17, 2022 |
| 4 | Insider transaction | Feb 22, 2022 | Feb 17, 2022 |
| 4 | Insider transaction | Feb 22, 2022 | Feb 17, 2022 |
| 4 | Insider transaction | Feb 22, 2022 | Feb 17, 2022 |
| 4 | Insider transaction | Feb 22, 2022 | Feb 17, 2022 |
| 4 | Insider transaction | Feb 22, 2022 | Feb 17, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 27, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2022 | — |
Showing 200 filings, the most recent 200. 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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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
- Duke Energy CORP DUK
- Xcel Energy Inc XEL
- Exelon Corp EXC
- Consolidated Edison Inc ED
- PG&E Corp PCG
- Wec Energy Group, Inc. WEC
- Public Service Enterprise Group Inc PEG
- Ameren Corp AEE
Source: SEC EDGAR filings. This is company-reported data, not investment advice.