Company Atlasby KadoaStar on GitHub

Ameren AEE

Ameren is the 317th largest S&P 500 company by market cap, worth $29.9 billion. 13 directors have filed with the SEC in the last 12 months (who counts), 1 of them an executive. 8 other officers are on file. At 30 Jun 2026, Vanguard was its largest institutional holder, with 13.4% of the company.

Chair and CEO
Martin J. Lyons
Sector
Utilities
Sub-industry
Multi-Utilities
Headquarters
St. Louis, Missouri
Founded
1902
More
Wikipedia
Market cap
$29.9B
317th largest, 23 Oct 2026 close
Revenue
$8.8B
Fiscal year 2025
Price to sales
3.4
Market cap over revenue
Employees
8,913
10-K, 31 Dec 2025
Market cap per employee
$3.4M
Market cap over employees
Connections
5
S&P 500 companies sharing a director or officer

Largest institutional holders

Each fund group's share of Ameren. Where a company has several share classes, the share is of its total value.

13F filings for the quarter to 30 Jun 2026

These five hold 42.9% of Ameren.

Source: SEC Form 13F data sets, SEC XBRL shares outstanding · All holders

Board and officers

5 people here also hold roles at other S&P 500 companies.

Roles filed up to 30 Sep 2026

NameTitle
Directors (13)
Martin J. LyonsChairman, President & CEOAlso at Martin Marietta MaterialsLast filed 3 Mar 2026Chairman, President & CEO
Cynthia J. BrinkleyDirectorLast filed 7 Jan 2026Director
Catherine S. BruneDirectorLast filed 6 Mar 2026Director
Ward H. DicksonDirectorAlso at Avery DennisonLast filed 7 Jan 2026Director
Jamie L. EngstromDirectorLast filed 7 Jan 2026Director
Ellen M. FitzsimmonsDirectorLast filed 7 Jan 2026Director
Rafael FloresDirectorDirector
Richard J. HarshmanDirectorAlso at PNC Financial ServicesLast filed 7 Jan 2026Director
Craig S. IveyDirectorLast filed 7 Jan 2026Director
Steven H. LipsteinDirectorLast filed 7 Jan 2026Director
Leo S. Mackay Jr.DirectorAlso at CognizantLast filed 7 Jan 2026Director
Timothy S. RauschDirectorLast filed 3 Mar 2026Director
Steven O. VondranDirectorAlso at American TowerLast filed 7 Jan 2026Director
Officers (8)
Ajay K. AroraEVP of SubsidiaryLast filed 6 Jul 2026EVP of Subsidiary
David Matthew FeinbergEVP, GC & SecretaryLast filed 9 Feb 2026EVP, GC & Secretary
Ryan J. MartinSVP FinanceLast filed 20 Aug 2026SVP Finance
Aaron P. MeldaChairman & President of SubLast filed 6 Jul 2026Chairman & President of Sub
Michael L. MoehnGroup President, UtilitiesLast filed 5 Aug 2026Group President, Utilities
Eric V. SeidlerSVP of SubsidiaryLast filed 3 Mar 2026SVP of Subsidiary
Theresa A. ShawSVP and CATOLast filed 17 Aug 2026SVP and CATO
Patrick E. SmithChairman & President of SubLast filed 6 Jul 2026Chairman & President of Sub

Source: SEC insider filings (Forms 3, 4 and 5), Ameren's Form 4 filings · All directors and officers

Companies that share people with Ameren

Each person's title here, then at the other company.

Source: SEC insider filings · See the whole network

Ameren's market cap since December 2008

Marked weeks are changes in the share count, such as a merger, not market moves.

Weekly, up to 23 Oct 2026

Show equal percentage changes as equal steps.
201020122014201620182020202220242026$29.9B

Source: Yahoo Finance closing prices, SEC XBRL shares outstanding

Workforce

Headcount at 31 Dec 2025

Employees
8,913
The following table presents our employee count and their average tenure as of December 31, 2025, and the attrition rate in 2025: … Ameren 8,913
Ameren Form 10-K

Source: Ameren Form 10-K

Insider trades

Open-market buys and sales by directors and officers. Grants, option exercises and shares withheld for tax are left out.

Trades from 30 Sep 2025 to 30 Sep 2026

Directors and officers sold $7.4 million of stock in 19 sales and made no open-market purchases in the 12 months to 30 Sep 2026.

DatePersonTitleTypeSharesValue
11 Sep 2026SaleRafael FloresDirectorDirectorSale248$26K
20 Aug 2026SaleRyan J. MartinSVP FinanceSVP FinanceSale500$55K
18 Aug 2026SaleRyan J. MartinSVP FinanceSVP FinanceSale471$52K
14 Aug 2026SaleTheresa A. ShawSVP and CATOSVP and CATOSale325$35K
3 Aug 2026SaleMichael L. MoehnGroup President, UtilitiesGroup President, UtilitiesSale6,500$708K
14 May 2026SaleTheresa A. ShawSVP and CATOSVP and CATOSale325$35K
12 May 2026SaleTheresa A. ShawSVP and CATOSVP and CATOSale1,500$164K
1 May 2026SaleMichael L. MoehnGroup President, UtilitiesGroup President, UtilitiesSale6,500$739K
4 Mar 2026SaleRyan J. MartinSVP FinanceSVP FinanceSale1,300$147K
3 Mar 2026SaleMartin J. LyonsChairman, President & CEOChairman, President & CEOSale26,818$3.0M

Showing 10 of 19 trades

Source: SEC insider transactions data sets, Ameren's Form 4 filings

Trades by members of Congress and officials

Trades members of Congress and senior executive branch officials disclosed, including their families'. Amounts are filed as ranges.

Trades from 20 Oct 2023 to 20 Oct 2026

5 people disclosed 7 purchases and 7 sales of Ameren stock since October 2023.

DateMember or officialTypeAmount
25 Sep 2026Rohit Khanna (House, D-CA)House, D-CA · SoldSale$1,001 to $15,000$1K to $15K
29 Jan 2026Rohit Khanna (House, D-CA)House, D-CA · BoughtPurchase$15,001 to $50,000$15K to $50K
23 Jan 2026Donald J Trump (President)President · BoughtPurchase$1,001 to $15,000$1K to $15K
6 Jan 2026Donald J Trump (President)President · BoughtPurchase$100,001 to $250,000$100K to $250K
17 Dec 2025Rohit Khanna (House, D-CA)House, D-CA · BoughtPurchase$1,001 to $15,000$1K to $15K
25 Sep 2025Julie Johnson (House, D-TX)House, D-TX · SoldSale$1,001 to $15,000$1K to $15K
23 Sep 2025Julie Johnson (House, D-TX)House, D-TX · SoldSale$1,001 to $15,000$1K to $15K
23 Sep 2025Julie Johnson (House, D-TX)House, D-TX · BoughtPurchase$1,001 to $15,000$1K to $15K
27 Jun 2025Rohit Khanna (House, D-CA)House, D-CA · BoughtPurchase$1,001 to $15,000$1K to $15K
15 May 2025Rob Bresnahan (House, R-PA)House, R-PA · SoldSale$1,001 to $15,000$1K to $15K

Showing 10 of 14 trades

Source: House, Senate and OGE disclosures via the Congress trading monitor

Not on file: no WARN layoff notices under its own name since October 2023.