LNT - CIK 0000352541
ALLIANT ENERGY CORP has filed 3,106 documents with the SEC 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.
| Filing | Type | Filed | Period covered |
|---|---|---|---|
| U-6B-2 | - | 2002-08-14 | - |
| 35-CERT | - | 2002-08-13 | - |
| Major company event | 8-K | 2002-08-09 | 2002-08-09 |
| Quarterly report | 10-Q | 2002-08-09 | 2002-06-30 |
| POS AMC | - | 2002-07-22 | - |
| Major company event | 8-K | 2002-07-19 | 2002-07-18 |
| 35-CERT/A | - | 2002-07-18 | - |
| Employee plan annual report | 11-K | 2002-07-15 | 2001-12-31 |
| POS AMC | - | 2002-07-01 | - |
| NT 11-K | - | 2002-07-01 | 2001-12-31 |
| U-1/A | - | 2002-06-21 | - |
| Major company event | 8-K | 2002-06-12 | 2002-06-12 |
| 35-CERT | - | 2002-05-31 | - |
| 35-CERT | - | 2002-05-31 | - |
| U-9C-3 | - | 2002-05-28 | 2002-03-31 |
| Employee stock plan | S-8 | 2002-05-15 | - |
| Employee stock plan | S-8 | 2002-05-15 | - |
| Quarterly report | 10-Q | 2002-05-15 | 2002-03-31 |
| U-6B-2 | - | 2002-05-09 | - |
| SE | - | 2002-05-02 | - |
| U5S | - | 2002-05-01 | 2001-12-31 |
| Annual report to shareholders | ARS | 2002-04-05 | 2001-12-31 |
| Proxy statement | DEF 14A | 2002-04-03 | 2002-05-15 |
| 35-CERT | - | 2002-03-29 | - |
| 10-K405 | - | 2002-03-27 | 2001-12-31 |
| U-9C-3 | - | 2002-03-25 | 2001-12-31 |
| U-1/A | - | 2002-03-22 | - |
| NO ACT | - | 2002-03-11 | 2002-01-10 |
| Major company event (amended) | 8-K/A | 2002-02-20 | 2002-01-01 |
| POS AMC | - | 2002-02-19 | - |
| U-6B-2/A | - | 2002-02-15 | - |
| 35-CERT | - | 2002-02-12 | - |
| U-1 | - | 2002-02-11 | - |
| U-6B-2 | - | 2002-02-11 | - |
| 35-CERT | - | 2002-02-11 | - |
| Quarterly report (amended) | 10-Q/A | 2002-01-30 | 2001-09-30 |
| Quarterly report (amended) | 10-Q/A | 2002-01-30 | 2001-06-30 |
| Quarterly report (amended) | 10-Q/A | 2002-01-30 | 2001-03-31 |
| Major company event | 8-K | 2002-01-29 | 2002-01-29 |
| Major company event | 8-K | 2002-01-10 | 2002-01-01 |
| 35-CERT | - | 2002-01-02 | - |
| 35-CERT | - | 2002-01-02 | - |
| 424B3 | - | 2001-12-28 | - |
| S-4 | - | 2001-12-13 | - |
| 35-CERT | - | 2001-11-30 | - |
| U-9C-3 | - | 2001-11-16 | 2001-09-30 |
| Major company event | 8-K | 2001-11-15 | 2001-11-15 |
| Quarterly report | 10-Q | 2001-11-14 | 2001-09-30 |
| Prospectus supplement | 424B5 | 2001-11-13 | - |
| 35-CERT | - | 2001-11-13 | - |