[Form 3] AMEREN CORP Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Ameren Corp (AEE) filed an initial statement of beneficial ownership for a company insider who serves as SVP of a subsidiary. The filing reports 11,535 shares of common stock held directly, which includes 5,694 restricted stock units granted under the 2022 Omnibus Incentive Compensation Plan. It also lists 1,769 share equivalents held indirectly through the Ameren Corporation Savings Investment Plan’s unitized stock fund as of October 31, 2025.

The date of the event requiring the statement was October 25, 2025. This is an administrative disclosure of current holdings under Section 16.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Seidler Eric V

(Last) (First) (Middle)

1901 CHOUTEAU AVENUE

(Street)

SAINT LOUIS MO 63103

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/25/2025

3. Issuer Name and Ticker or Trading Symbol
AMEREN CORP [ AEE ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP of Subsidiary

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, $.01 Par Value	1,769(1)	I	By 401(k)
Common Stock, $.01 Par Value	11,535(2)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the estimated number of share equivalents held by the reporting person in the unitized stock fund included in the Ameren Corporation Savings Investment Plan as of October 31, 2025.

2. Amount includes 5,694 restricted stock units granted under the issuer's 2022 Omnibus Incentive Compensation Plan.

Remarks:

	Jonathan T. Shade, Deputy Corp. Secy. for Ameren Corporation, attorney-in-fact for Eric V. Seidler	11/04/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Ameren (AEE) disclose in this filing?

An insider’s initial beneficial ownership, including 11,535 direct shares and 1,769 share equivalents held via the Savings Investment Plan.

How many Ameren (AEE) shares are held directly?

The filing reports 11,535 shares of common stock held directly.

How many Ameren (AEE) share equivalents are in the 401(k) plan?

It lists 1,769 share equivalents in the unitized stock fund as of October 31, 2025.

How many restricted stock units (RSUs) are included for AEE?

The direct holdings include 5,694 RSUs granted under the 2022 Omnibus Incentive Compensation Plan.

What is the insider’s relationship to Ameren (AEE)?

The reporting person is an officer, identified as SVP of a subsidiary.

What is the event date for this AEE ownership report?

The event date is October 25, 2025.