[Form 4] Ameren Corporation Insider Trading Activity

Rhea-AI Filing Summary

Ameren Corporation insider transaction reported for reporting person Gwendolyn G. Mizell. The Form 4 shows a sale of 1,500 shares of Ameren common stock on 09/03/2025 at a price of $99.50 per share. After the sale, the reporting person beneficially owns 7,629 shares directly and indirectly, and holds an additional estimated 2,385 share equivalents indirectly in the Ameren Savings Investment Plan as of August 31, 2025. The filing was signed by an attorney-in-fact on behalf of Ms. Mizell on 09/04/2025. The document provides transaction details and an explanatory remark about the 401(k) share-equivalent estimate.

Positive

• Transaction fully disclosed with date, price, and post-transaction holdings
• Includes explanatory remark clarifying the 2,385 share-equivalent 401(k) estimate as of August 31, 2025
• Form executed by attorney-in-fact and signed, meeting signature disclosure requirements

Negative

• Insider sale of 1,500 shares reduces the reporting person's direct beneficial holdings
• Filing does not state whether the sale was pre-planned under a Rule 10b5-1 plan (no box checked indicating such)

Insights

Financial Analyst

TL;DR: Insider sold a small number of shares at market, leaving modest residual ownership; transaction appears routine and not materially transformational.

The sale of 1,500 shares at $99.50 is clearly disclosed and represents a limited portion of the reporting person's combined direct and indirect holdings (7,629 shares plus 2,385 share equivalents). There is no indication of derivative transactions, pledges, or atypical disposition codes. For investors, this disclosure documents routine liquidity by an officer of a subsidiary and does not, by itself, alter company fundamentals or capitalization.

Corporate Governance Expert

TL;DR: Filing meets Section 16 disclosure requirements and includes an explanation for indirect 401(k) holdings.

The Form 4 is executed by an attorney-in-fact and includes an explanatory remark identifying the unitized stock fund estimate as of August 31, 2025, which improves transparency. The report indicates individual filing (not joint) and lists the reporting person as an officer of a subsidiary. There are no indications of late filing or exemptions noted on the face of the document.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mizell Gwendolyn G

(Last) (First) (Middle)

1901 CHOUTEAU AVE

(Street)

ST LOUIS MO 63103

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
09/03/2025

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $.01 Par Value								2,385(1)	I	By 401(K)
Common Stock, $.01 Par Value	09/03/2025		S		1,500	D	$99.5	7,629	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	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 August 31, 2025.

Remarks:

	Jonathan T. Shade, Deputy Corp. Secy. of Ameren Corporation, attorney-in-fact for Gwendolyn G. Mizell	09/04/2025
	** 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 4 (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 the Ameren (AEE) Form 4 filed by Gwendolyn G. Mizell disclose?

The Form 4 discloses a sale of 1,500 Ameren shares on 09/03/2025 at $99.50 per share and shows 7,629 shares beneficially owned after the sale plus 2,385 share equivalents in a 401(k) plan as of August 31, 2025.

How many Ameren shares does Gwendolyn G. Mizell beneficially own after the reported transaction?

The filing reports 7,629 shares beneficially owned following the sale, with an additional estimated 2,385 share equivalents

At what price were the Ameren (AEE) shares sold in the Form 4?

The reported sale price was $99.50 per share for the 1,500 shares sold on 09/03/2025.

Does the Form 4 indicate the sale was part of a Rule 10b5-1 plan?

No box or statement in the filing indicates the transaction was made pursuant to a Rule 10b5-1(c) plan.

Who signed the Form 4 for Gwendolyn G. Mizell?

The Form 4 was signed by Jonathan T. Shade, Deputy Corporate Secretary, acting as attorney-in-fact for Gwendolyn G. Mizell on 09/04/2025.