Ameren Illinois Co SEC filings AILLN
Ameren Illinois Co has 473 filings in SEC EDGAR's recent list, going back to Feb 28, 1994. Its latest annual report, Form 10-K, was filed on Feb 18, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 3, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 24, 2026 (other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| DEF 14C | Information statement | Mar 31, 2026 | May 14, 2026 |
| DEF 14C | Information statement | Mar 25, 2025 | May 8, 2025 |
| DEF 14C | Information statement | Apr 5, 2024 | May 9, 2024 |
| DEF 14C | Information statement | Mar 28, 2023 | — |
| DEF 14C | Information statement | Mar 29, 2022 | May 12, 2022 |
| DEF 14C | Information statement | Mar 23, 2021 | May 6, 2021 |
| DEF 14C | Information statement | Mar 26, 2020 | May 7, 2020 |
| DEF 14C | Information statement | Mar 19, 2019 | May 2, 2019 |
| DEF 14C | Information statement | Mar 19, 2018 | May 3, 2018 |
| DEF 14C | Information statement | Mar 15, 2017 | Apr 27, 2017 |
| DEF 14C | Information statement | Mar 18, 2016 | Apr 28, 2016 |
| DEF 14C | Information statement | Mar 12, 2015 | Apr 23, 2015 |
| DEF 14C | Information statement | Mar 11, 2014 | Apr 24, 2014 |
| DEF 14C | Information statement | Mar 7, 2013 | Apr 23, 2013 |
| DEF 14C | Information statement | Mar 9, 2012 | Apr 24, 2012 |
| DEF 14C | Information statement | Mar 9, 2011 | Apr 21, 2011 |
| DEF 14C | Information statement | Mar 10, 2010 | Apr 27, 2010 |
| DEF 14C | Information statement | Mar 11, 2009 | Apr 28, 2009 |
| DEF 14C | Information statement | Mar 6, 2008 | Apr 22, 2008 |
| DEF 14C | Information statement | Mar 13, 2007 | Apr 24, 2007 |
| DEF 14C | Information statement | Mar 15, 2006 | May 2, 2006 |
| DEF 14C | Information statement | Mar 15, 2005 | Apr 26, 2005 |
| DEF 14A | Proxy statement | Mar 23, 2004 | Apr 27, 2004 |
| DEF 14A | Proxy statement | Mar 27, 2003 | Mar 27, 2003 |
| DEF 14A | Proxy statement | Mar 28, 2002 | Apr 23, 2002 |
| DEF 14A | Proxy statement | Mar 26, 2001 | Apr 24, 2001 |
| DEF 14A | Proxy statement | Mar 29, 2000 | Apr 25, 2000 |
| DEF 14A | Proxy statement | Mar 29, 1999 | Apr 22, 1999 |
| DEF 14A | Proxy statement | Mar 30, 1998 | Apr 28, 1998 |
| DEF 14A | Proxy statement | Mar 7, 1997 | Mar 7, 1997 |
| DEF 14A | Proxy statement | Mar 4, 1996 | Mar 4, 1996 |
| DEF 14A | Proxy statement | Mar 6, 1995 | Apr 26, 1995 |
| DEF 14A | Proxy statement | Mar 3, 1995 | Mar 6, 1995 |
| DEF 14A | Proxy statement | Mar 14, 1994 | Apr 27, 1994 |
| PRE 14A | Preliminary proxy statement | Mar 1, 1994 | Mar 16, 1994 |
Showing 35 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.
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
- AILIH (OTC), AILLI (OTC), AILLM (OTC), AILLN (OTC), AILIM (OTC), AILLO (OTC), AILIN (OTC), AILLP (OTC), AILIO (OTC), AILIP (OTC)
- Fiscal year ends
- December 31
- Incorporated in
- IL
- Headquarters
- Collinsville, IL
- SEC CIK
- 18654
- Former names
- CENTRAL ILLINOIS PUBLIC SERVICE CO (until Sep 13, 2010)
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.