Tax withholding changes Ameren (NYSE: AEE) insider share holdings

Rhea-AI Filing Summary

Ameren Corp insider Gwendolyn G. Mizell reported a Form 4 showing 943 shares of common stock were disposed of at $113.28 per share to satisfy tax withholding from vesting stock awards. After this tax-withholding disposition, she directly owns 6,324 shares and indirectly holds 2,424 share equivalents through the Ameren Savings Investment Plan as of February 28, 2026.

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

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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)
02/27/2026

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								2,424(1)	I	By 401(K)
Common Stock, $.01 Par Value	02/27/2026		F		943	D	$113.28	6,324(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 February 28, 2026.

2. Shares withheld by the issuer to satisfy tax withholding obligations arising in connection with the vesting of performance share units and restricted stock units.

Remarks:

	Jonathan T. Shade, Deputy Corp. Secy. of Ameren Corporation, attorney-in-fact for Gwendolyn G. Mizell	03/03/2026
	** 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 insider transaction did Ameren (AEE) executive Gwendolyn Mizell report on this Form 4?

Gwendolyn G. Mizell reported a tax-withholding disposition of 943 Ameren common shares at $113.28 per share. The shares were withheld by Ameren to cover taxes triggered by the vesting of performance share units and restricted stock units, not an open-market sale.

How many Ameren (AEE) shares does Gwendolyn Mizell own after the reported Form 4 transaction?

After the tax-withholding disposition, Gwendolyn Mizell directly owns 6,324 Ameren common shares. She also indirectly holds an estimated 2,424 share equivalents in a unitized stock fund within the Ameren Corporation Savings Investment Plan as of February 28, 2026.

Was the Ameren (AEE) Form 4 transaction an open-market sale of shares?

The Form 4 transaction was not an open-market sale. Ameren withheld 943 shares to satisfy tax obligations related to vesting performance share units and restricted stock units, a routine tax-withholding disposition coded as “F,” rather than a discretionary sale into the market.

At what price were Ameren (AEE) shares withheld in Gwendolyn Mizell’s Form 4 filing?

The 943 Ameren common shares were withheld at $113.28 per share. This price is used to calculate the value of shares applied to satisfy Mizell’s tax withholding obligations that arose when her performance share units and restricted stock units vested on February 27, 2026.

How are Gwendolyn Mizell’s indirect Ameren (AEE) holdings structured in this Form 4?

Her indirect holdings represent an estimated 2,424 share equivalents in a unitized stock fund under the Ameren Corporation Savings Investment Plan. These equivalents, as of February 28, 2026, reflect retirement-plan investments rather than directly held Ameren common shares in a brokerage account.