Ameren Illinois Co SEC filings AILIO
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 |
|---|---|---|---|
| 3 | Initial insider ownership | Aug 12, 2022 | Jul 1, 2022 |
| 3 | Initial insider ownership | Jan 24, 2019 | Jan 16, 2019 |
| 3 | Initial insider ownership | Jan 8, 2013 | Jan 1, 2013 |
| 3 | Initial insider ownership | Jun 25, 2012 | Jun 13, 2012 |
| 3 | Initial insider ownership | Jan 11, 2012 | Jan 1, 2012 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 11, 2011 | — |
| 3 | Initial insider ownership | Apr 29, 2011 | Apr 21, 2011 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 20, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2010 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2010 | — |
| 5 | Annual insider ownership | Apr 22, 2010 | Dec 31, 2009 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2010 | — |
| SC 13G | Ownership over 5% (passive) | Jan 13, 2009 | — |
| SC 13G | Ownership over 5% (passive) | Feb 1, 2008 | — |
| SC 13G | Ownership over 5% (passive) | Apr 11, 2007 | — |
| 3 | Initial insider ownership | Oct 18, 2005 | Oct 16, 2005 |
| 3 | Initial insider ownership | Sep 3, 2004 | Sep 1, 2004 |
| 3 | Initial insider ownership | Sep 1, 2004 | Sep 1, 2004 |
| 3 | Initial insider ownership | Mar 11, 2004 | Aug 30, 2001 |
| 3 | Initial insider ownership | Mar 11, 2004 | Jul 1, 1998 |
| 3 | Initial insider ownership | Mar 11, 2004 | May 20, 2003 |
| 3 | Initial insider ownership | Mar 11, 2004 | Oct 12, 2001 |
| 3 | Initial insider ownership | Mar 11, 2004 | Jan 13, 1997 |
| 3 | Initial insider ownership | Mar 11, 2004 | Apr 22, 2003 |
| 3 | Initial insider ownership | Mar 11, 2004 | Dec 11, 2003 |
| 3 | Initial insider ownership | Mar 11, 2004 | Apr 22, 2003 |
| 3 | Initial insider ownership | Mar 11, 2004 | Oct 22, 2001 |
| 3 | Initial insider ownership | Mar 11, 2004 | Apr 22, 2003 |
| 3 | Initial insider ownership | Mar 11, 2004 | Apr 22, 2003 |
| 3 | Initial insider ownership | Mar 11, 2004 | Feb 1, 2003 |
| 3 | Initial insider ownership | Mar 11, 2004 | Oct 12, 2001 |
| 3 | Initial insider ownership | Mar 11, 2004 | Dec 31, 1997 |
| 3 | Initial insider ownership | Mar 11, 2004 | Apr 22, 1999 |
Showing 33 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.