[Form 3] AMEREN CORP Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Ameren Corp (AEE): Initial insider holdings reported. Ryan J. Martin, SVP Corporate Strategy, Risk & Investor Relations, filed an initial statement of beneficial ownership effective 10/25/2025.

He reported 25,417 shares of common stock held directly, which includes 5,746 restricted stock units granted under the 2022 Omnibus Incentive Compensation Plan. He also reported 1,770 share equivalents held indirectly through the Ameren Corporation Savings Investment Plan as of October 31, 2025.

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^*

Martin Ryan J

(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 Corp Strat Risk & Inv Rel

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	1,770(1)	I	By 401(k)
Common Stock, $.01 Par Value	25,417(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 5,746 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 Ryan J. Martin	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 initial statement of beneficial ownership (Form 3) for officer Ryan J. Martin, effective 10/25/2025.

How many Ameren (AEE) shares does the officer hold directly?

He reported 25,417 shares of common stock held directly.

How many Ameren (AEE) shares are held indirectly by the officer?

He reported 1,770 share equivalents indirectly via the Ameren Corporation Savings Investment Plan as of October 31, 2025.

How many RSUs are included in the officer’s direct holdings?

Direct holdings include 5,746 restricted stock units granted under the 2022 Omnibus Incentive Compensation Plan.

What is the officer’s role at Ameren (AEE)?

He serves as SVP Corporate Strategy, Risk & Investor Relations.