Company · CIK 352541 # ALLIANT ENERGY CORP | CIK | [352541](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000352541) (SEC EDGAR) | | --- | --- | | Industry (SIC) | 4931 — Electric & Other Services Combined | | Incorporated in | WI | | Business address | WI | | Listed | LNT (Nasdaq) | | First annual or quarterly report | 1994-02-07 | ## Offerings 15 registrations | Registration | Label and status | First filed | Last event | Filings | | --- | --- | --- | --- | --- | | 333-276062 | Shelf Effective | 2023-12-15 | 2026-03-19 | 5 | | 333-275338 | Shelf Effective | 2023-11-06 | 2023-11-06 | 1 | | 333-251353 | Shelf Effective | 2020-12-15 | 2022-12-15 | 2 | | 333-249909 | Shelf Effective | 2020-11-06 | 2020-11-06 | 1 | | 333-222076 | Shelf Effective | 2017-12-15 | 2019-11-14 | 4 | | 333-221355 | Shelf Effective | 2017-11-06 | 2017-11-06 | 1 | | 333-200941 | Shelf Effective | 2014-12-15 | 2017-05-09 | 3 | | 333-200036 | Shelf Effective | 2014-11-10 | 2014-11-10 | 1 | | 333-178577 | Shelf Effective | 2011-12-16 | 2011-12-16 | 1 | | 333-177871 | Shelf Effective | 2011-11-09 | 2011-11-09 | 1 | | 333-162214 | Shelf Effective | 2009-09-30 | 2009-10-01 | 3 | | 333-155573 | Shelf Effective | 2008-11-21 | 2008-11-21 | 1 | | 333-114361 | Shelf Dormant | 2004-04-09 | 2004-04-09 | 1 | | 333-114062 | Shelf Dormant | 2004-03-31 | 2004-03-31 | 1 | | 333-104269 | Shelf Effective | 2003-04-02 | 2003-07-03 | 3 | ## Filings 31 | Filed | Filing | Registration | Accession | | --- | --- | --- | --- | | 2026-03-19 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312526116238/0001193125-26-116238-index.htm) Shelf takedown | 333-276062 | 0001193125-26-116238 | | 2025-09-25 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312525216952/0001193125-25-216952-index.htm) Shelf takedown | 333-276062 | 0001193125-25-216952 | | 2025-09-23 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312525212360/0001193125-25-212360-index.htm) Shelf takedown | 333-276062 | 0001193125-25-212360 | | 2025-05-09 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312525116988/0001193125-25-116988-index.htm) Shelf takedown | 333-276062 | 0001193125-25-116988 | | 2023-12-15 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000035254123000122/0000352541-23-000122-index.htm) Shelf registered | 333-276062 | 0000352541-23-000122 | | 2023-11-06 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000035254123000110/0000352541-23-000110-index.htm) Shelf registered | 333-275338 | 0000352541-23-000110 | | 2022-12-15 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312522304961/0001193125-22-304961-index.htm) Shelf takedown | 333-251353 | 0001193125-22-304961 | | 2020-12-15 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312520318103/0001193125-20-318103-index.htm) Shelf registered | 333-251353 | 0001193125-20-318103 | | 2020-11-06 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312520287796/0001193125-20-287796-index.htm) Shelf registered | 333-249909 | 0001193125-20-287796 | | 2019-11-14 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312519291652/0001193125-19-291652-index.htm) Shelf takedown | 333-222076 | 0001193125-19-291652 | | 2018-12-13 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312518348851/0001193125-18-348851-index.htm) Shelf takedown | 333-222076 | 0001193125-18-348851 | | 2018-05-21 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312518168293/0001193125-18-168293-index.htm) Shelf takedown | 333-222076 | 0001193125-18-168293 | | 2017-12-15 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312517370362/0001193125-17-370362-index.htm) Shelf registered | 333-222076 | 0001193125-17-370362 | | 2017-11-06 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312517333165/0001193125-17-333165-index.htm) Shelf registered | 333-221355 | 0001193125-17-333165 | | 2017-05-09 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312517164381/0001193125-17-164381-index.htm) Shelf takedown | 333-200941 | 0001193125-17-164381 | | 2015-03-04 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312515076990/0001193125-15-076990-index.htm) Shelf takedown | 333-200941 | 0001193125-15-076990 | | 2014-12-15 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312514442050/0001193125-14-442050-index.htm) Shelf registered | 333-200941 | 0001193125-14-442050 | | 2014-11-10 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312514404464/0001193125-14-404464-index.htm) Shelf registered | 333-200036 | 0001193125-14-404464 | | 2011-12-16 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312511343983/0001193125-11-343983-index.htm) Shelf registered | 333-178577 | 0001193125-11-343983 | | 2011-11-09 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312511304822/0001193125-11-304822-index.htm) Shelf registered | 333-177871 | 0001193125-11-304822 | | 2009-10-01 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312509201764/0001193125-09-201764-index.htm) Shelf takedown | 333-162214 | 0001193125-09-201764 | | 2009-09-30 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312509200769/0001193125-09-200769-index.htm) Shelf takedown | 333-162214 | 0001193125-09-200769 | | 2009-09-30 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000119312509200760/0001193125-09-200760-index.htm) Shelf registered | 333-162214 | 0001193125-09-200760 | | 2008-11-21 | [S-3ASR](https://www.sec.gov/Archives/edgar/data/352541/000089706908001787/0000897069-08-001787-index.htm) Shelf registered | 333-155573 | 0000897069-08-001787 | | 2004-07-16 | [RW](https://www.sec.gov/Archives/edgar/data/352541/000095012004000460/0000950120-04-000460-index.htm) Withdrawn | 070-09717 | 0000950120-04-000460 | | 2004-04-09 | [S-3](https://www.sec.gov/Archives/edgar/data/352541/000089706904000790/0000897069-04-000790-index.htm) Shelf registered | 333-114361 | 0000897069-04-000790 | | 2004-03-31 | [S-3](https://www.sec.gov/Archives/edgar/data/352541/000089706904000729/0000897069-04-000729-index.htm) Shelf registered | 333-114062 | 0000897069-04-000729 | | 2004-01-27 | [RW](https://www.sec.gov/Archives/edgar/data/352541/000095012004000067/0000950120-04-000067-index.htm) Withdrawn | 070-09891 | 0000950120-04-000067 | | 2003-07-03 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312503016615/0001193125-03-016615-index.htm) Shelf takedown | 333-104269 | 0001193125-03-016615 | | 2003-06-30 | [424B5](https://www.sec.gov/Archives/edgar/data/352541/000119312503014766/0001193125-03-014766-index.htm) Shelf takedown | 333-104269 | 0001193125-03-014766 | | 2003-04-02 | [S-3](https://www.sec.gov/Archives/edgar/data/352541/000089706903000407/0000897069-03-000407-index.htm) Shelf registered | 333-104269 | 0000897069-03-000407 | [All filings of this company](https://equitycapital.markets/filings?cik=352541) · [CSV](https://equitycapital.markets/filings.csv?cik=352541) --- Source page: https://equitycapital.markets/company/352541 · Data: U.S. SEC EDGAR · CC BY 4.0