LNT - Company ID 0000352541
ALLIANT ENERGY CORP has filed 3,106 public company documents between 1994 and 2026. The most frequent type is insider trade (2,041 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Type | Filing | Filed | Period covered | Open |
|---|---|---|---|---|
| 424B5 | Prospectus supplement | 3mo ago2026-03-19 | - | View filing |
| 424B5 | Prospectus supplement | 9mo ago2025-09-25 | - | View filing |
| 424B5 | Prospectus supplement | 9mo ago2025-09-23 | - | View filing |
| 424B5 | Prospectus supplement | 1y ago2025-05-09 | - | View filing |
| 424B5 | Prospectus supplement | 3y ago2022-12-15 | - | View filing |
| 424B5 | Prospectus supplement | 6y ago2019-11-14 | - | View filing |
| 424B5 | Prospectus supplement | 7y ago2018-12-13 | - | View filing |
| 424B5 | Prospectus supplement | 8y ago2018-05-21 | - | View filing |
| 424B5 | Prospectus supplement | 9y ago2017-05-09 | - | View filing |
| 424B5 | Prospectus supplement | 11y ago2015-03-04 | - | View filing |
| 424B5 | Prospectus supplement | 16y ago2009-10-01 | - | View filing |
| 424B5 | Prospectus supplement | 16y ago2009-09-30 | - | View filing |
| 424B5 | Prospectus supplement | 23y ago2003-07-03 | - | View filing |
| 424B5 | Prospectus supplement | 23y ago2003-06-30 | - | View filing |
| 424B5 | Prospectus supplement | 24y ago2001-11-13 | - | View filing |
| 424B5 | Prospectus supplement | 24y ago2001-10-25 | - | View filing |