Ameren Illinois Co SEC filings AILLM
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 |
|---|---|---|---|
| DEFA14C | Filing | Mar 31, 2026 | — |
| DEFA14C | Filing | Mar 25, 2025 | — |
| UPLOAD | Letter from the SEC | Apr 18, 2024 | — |
| DEFA14C | Filing | Apr 5, 2024 | — |
| UPLOAD | Letter from the SEC | Mar 27, 2024 | — |
| DEFA14C | Filing | Mar 28, 2023 | — |
| DEFA14C | Filing | Mar 29, 2022 | — |
| DEFA14C | Filing | Mar 23, 2021 | — |
| DEFA14C | Definitive additional information statement materials including rule 14(a)(12) | Mar 26, 2020 | — |
| DEFA14C | Definitive additional information statement materials including rule 14(a)(12) | Mar 19, 2019 | — |
| DEFA14C | Filing | Mar 19, 2018 | — |
| DEFA14C | Filing | Mar 15, 2017 | — |
| UPLOAD | Letter from the SEC | Jun 20, 2016 | — |
| UPLOAD | Letter from the SEC | Jun 8, 2016 | — |
| DEFA14C | Filing | Mar 18, 2016 | — |
| UPLOAD | Letter from the SEC | Jun 15, 2012 | — |
| UPLOAD | Letter from the SEC | May 25, 2012 | — |
| EFFECT | Filing | Jul 8, 2010 | — |
| UPLOAD | Letter from the SEC | May 4, 2010 | — |
| UPLOAD | Letter from the SEC | Apr 19, 2010 | — |
| 425 | Form 8-k | Apr 16, 2010 | — |
| 425 | Form 8-k | Mar 15, 2010 | — |
| CORRESP | Letter to the SEC | Jan 23, 2007 | — |
| CORRESP | Letter to the SEC | Dec 13, 2006 | — |
| U-6B-2 | U-6b-2 - amerencips 11-23-04 | Nov 23, 2004 | — |
| 10-K405 | Cips10k2001 | Mar 28, 2002 | Dec 31, 2001 |
| U-6B-2 | Amerencips u-6b-2 filing 6/15/2001 | Jun 15, 2001 | — |
| 10-K405 | Form 10-k | Mar 30, 2001 | Dec 31, 2000 |
| 11-K | Employee savings plan report | Jun 28, 2000 | Dec 31, 1999 |
| 11-K | Employee savings plan report | Jun 28, 2000 | Dec 31, 1999 |
| 10-K405 | Form 10-k | Mar 30, 2000 | Dec 31, 1999 |
| 11-K | Employee savings plan report | Jun 29, 1999 | Dec 31, 1998 |
| 11-K | Employee savings plan report | Jun 29, 1999 | Dec 31, 1998 |
| 11-K | Employee savings plan report | Jun 29, 1999 | Oct 27, 1998 |
| RW | Request for withdrawal | Jan 6, 1998 | — |
| RW | Request for withdrawal | Jan 6, 1998 | — |
| 11-K | Employee savings plan report | Jun 27, 1997 | Dec 31, 1996 |
| U-3A-2 | Filing | Feb 28, 1997 | Dec 31, 1996 |
| 11-K | Employee savings plan report | Jun 27, 1996 | Dec 31, 1995 |
| U-3A-2 | Filing | Feb 29, 1996 | Dec 31, 1995 |
| 11-K | Employee savings plan report | Jun 29, 1995 | Dec 31, 1994 |
| U-3A-2 | Filing | Feb 28, 1995 | Dec 31, 1994 |
| 8-A12G | Filing | Dec 21, 1994 | — |
| 11-K | Employee savings plan report | Jun 24, 1994 | Dec 31, 1993 |
| U-3A-2 | Filing | Feb 28, 1994 | Dec 31, 1993 |
Showing 45 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.
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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
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- 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.