---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-23-090991"
form_type: "8-K"
ticker: "AEE"
cik: "0001002910"
company_name: "AMEREN CORP"
filed_at: "2023-08-14T23:59:59+00:00"
generated_at: "2026-06-11T09:52:49.921207+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Executive Chairman Warner L. Baxter to retire Nov 2, 2023; CEO Martin Lyons named Chairman

## Summary
- Warner L. Baxter notified Company he will retire from Board and as Executive Chairman effective November 2, 2023.
- Board elected Martin J. Lyons, Jr., President and CEO, to additional role of Chairman, effective same date.
- Chairman role added to Lyons' existing duties; no other changes to executive leadership disclosed.

## SEC filing metadata
- accession: 0001104659-23-090991
- form_type: 8-K
- ticker: AEE
- cik: 0001002910
- company_name: AMEREN CORP
- filed_at: 2023-08-14T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1002910/000110465923090991/0001104659-23-090991-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1002910/000110465923090991/tm2323531d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-23-090991
- JSON: https://secwatch.observer/filing/0001104659-23-090991.json
- Plain text: https://secwatch.observer/filing/0001104659-23-090991.txt

## Key facts
- Executive change
  Martin J. Lyons, Jr. was elected as Chairman at AMEREN CORP.
  - Action: elected
  - Role: Chairman
  source text: The Board has elected Martin J. Lyons, Jr., the President and Chief Executive Officer of the Company and a member of the Board, to the additional role of Chairman, effective upon Mr. Baxter's retirement on November 2, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1002910/000110465923090991/0001104659-23-090991-index.htm
- Executive change
  Warner L. Baxter departed as Executive Chairman at AMEREN CORP.
  - Action: retire
  - Role: Executive Chairman
  source text: Warner L. Baxter, Executive Chairman of Ameren Corporation (the "Company"), notified the Company that he will retire from the Company's Board of Directors (the "Board") and as Executive Chairman, effective November 2, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1002910/000110465923090991/0001104659-23-090991-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.