[Form 4] AMEREN CORP Insider Trading Activity

Rhea-AI Filing Summary

Mark C. Lindgren, Executive Vice President and Chief HR Officer of a subsidiary of Ameren Corporation (AEE), reported a sale and current holdings in a Form 4 filing. On 09/12/2025 he sold 3,500 shares of Ameren common stock at $100.89 per share. After the transaction he beneficially owns 42,574 shares, which includes an estimated 1,701 share equivalents in the Ameren Savings Investment Plan as of August 31, 2025, and 48 accrued dividend equivalents from reinvested restricted stock units. The Form 4 was signed by an attorney-in-fact on 09/15/2025. The filing discloses the sale, the composition of holdings, and that dividend reinvestment affected the reported balance.

Positive

• Transparent disclosure of insider transaction and composition of holdings including 401(k) and dividend reinvestment
• Post-transaction holdings remain substantial at 42,574 shares, showing continued ownership

Negative

• Insider sale of 3,500 shares at $100.89 reduced the reporting person's position by approximately 7.6% of the post-transaction balance
• No 10b5-1 plan checkbox is marked on the filing to indicate a pre-arranged trading plan

Insights

Corporate Governance Expert

TL;DR: Routine insider sale disclosed; holdings remain meaningful and include retirement plan and dividend reinvestment.

The Form 4 documents a common, transparent disclosure of an insider sale rather than an unexplained ownership change. The reporting person retains a material position of 42,574 shares after selling 3,500 shares, and the filing clarifies that 1,701 share equivalents are held via the company savings plan and 48 dividend equivalents were added via reinvestment. From a governance perspective, the filing meets disclosure requirements and provides necessary detail on indirect ownership components.

Securities Analyst

TL;DR: Insider sold ~8% of post-transaction holdings at $100.89; transaction is notable but not necessarily material to ownership control.

The sale of 3,500 shares at $100.89 reduces the reporting person's stake to 42,574 shares. Given the combination of direct and indirect holdings (401(k) unitized fund and accrued dividend equivalents), the disclosure helps analysts reconcile changes in insider positions with plan activity. The filing contains no derivatives or option exercises and does not indicate any additional compensatory grants or plans beyond the dividend reinvestment note.

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^*

Lindgren Mark C

(Last) (First) (Middle)

P.O. BOX 66149

(Street)

ST. LOUIS MO 63166-6149

(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)
			EVP & Chief HR Officer of Sub

3. Date of Earliest Transaction (Month/Day/Year)
09/12/2025

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								1,701(1)	I	By 401(K)
Common Stock, $.01 Par Value	09/12/2025		S		3,500	D	$100.89	42,574(2)	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.

2. Amount includes 48 accrued dividend equivalents acquired during the third quarter of 2025 pursuant to a dividend reinvestment feature of 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 Mark C. Lindgren	09/15/2025
	** 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 Ameren (AEE) insider Mark C. Lindgren report on Form 4?

The filing reports a sale of 3,500 shares at $100.89 on 09/12/2025 and shows 42,574 shares beneficially owned after the transaction.

How much of Lindgren's Ameren holdings are in a retirement plan?

The filing states an estimated 1,701 share equivalents are held in the Ameren Corporation Savings Investment Plan as of 08/31/2025.

Did dividend reinvestment affect the reported holdings?

Yes. The reported total includes 48 accrued dividend equivalents from dividend reinvestment of restricted stock units during Q3 2025.

Was the Form 4 signed and when?

The Form 4 was signed by the attorney-in-fact, Jonathan T. Shade, on 09/15/2025.

Are there any derivative or option transactions reported?

No. Table II (derivative securities) shows no derivative or option transactions in this filing.