Ameren (NYSE: AEE) SVP Mizell awarded RSUs and shares vest on 2026 grant

Rhea-AI Filing Summary

Ameren Corporation insider activity centers on equity awards and vesting. Gwendolyn G. Mizell, SVP and Chief Sustainability Officer of a subsidiary, received 865 shares of common stock on February 5, 2026 as restricted stock units granted at $0 under Ameren’s 2022 Omnibus Incentive Compensation Plan, scheduled to vest by March 15, 2029. On the same date, 2,276 shares were acquired upon vesting of previously granted performance share units. Following these transactions, she directly held 10,815 common shares and indirectly held an estimated 2,423 share equivalents through the Ameren Corporation Savings Investment Plan as of January 31, 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

OMB APPROVAL

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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)
02/05/2026

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								2,423(1)	I	By 401(K)
Common Stock, $.01 Par Value	02/05/2026		A		865(2)	A	$0	8,494	D
Common Stock, $.01 Par Value	02/05/2026		A		2,276(3)	A	$0	10,815(4)	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 January 31, 2026.

2. These restricted stock units were granted under the issuer's 2022 Omnibus Incentive Compensation Plan (the "Plan") and are scheduled to vest upon the payment date in 2029, which shall be no later than March 15, 2029, subject to the terms of the Plan and the applicable award agreement issued thereunder.

3. Shares acquired upon vesting of previously-granted performance share units.

4. Amount includes 45 accrued dividend equivalents acquired during the third through fourth quarters of 2025 pursuant to a dividend reinvestment feature of restricted stock units granted under the Plan.

Remarks:

	Jonathan T. Shade, Deputy Corp. Secy. of Ameren Corporation, attorney-in-fact for Gwendolyn G. Mizell	02/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider stock transactions did Ameren (AEE) report for Gwendolyn G. Mizell?

Ameren reported that Gwendolyn G. Mizell received 865 shares of common stock as restricted stock units and acquired 2,276 shares upon vesting of performance share units on February 5, 2026, increasing her direct and indirect shareholdings in the company.

How many Ameren (AEE) shares does Gwendolyn G. Mizell hold after the reported Form 4 transactions?

After the reported transactions, Gwendolyn G. Mizell directly holds 10,815 Ameren common shares. She also has an estimated 2,423 share equivalents indirectly through the Ameren Corporation Savings Investment Plan, reflecting both direct ownership and retirement-plan-related exposure to Ameren stock.

What are the key details of the restricted stock units granted to Gwendolyn G. Mizell at Ameren (AEE)?

Mizell was granted 865 restricted stock units under Ameren’s 2022 Omnibus Incentive Compensation Plan. These units are scheduled to vest on a payment date in 2029, no later than March 15, 2029, subject to the plan’s terms and the applicable award agreement.

What does the vesting of performance share units mean in Ameren (AEE) Gwendolyn Mizell’s Form 4?

The Form 4 notes that 2,276 Ameren shares were acquired when previously granted performance share units vested. This means performance-based equity awards converted into actual Ameren common shares, increasing Mizell’s direct ownership position in the company on February 5, 2026.

How are Ameren (AEE) shares held by Gwendolyn G. Mizell through the savings plan reported?

The filing reports 2,423 estimated share equivalents held in a unitized stock fund within the Ameren Corporation Savings Investment Plan as of January 31, 2026. These are reported as indirect ownership, reflecting retirement-plan investments tied to Ameren common stock.

Under which equity plan were Gwendolyn G. Mizell’s Ameren (AEE) restricted stock units granted?

Her restricted stock units were granted under Ameren’s 2022 Omnibus Incentive Compensation Plan. The plan governs grant terms, vesting conditions, and the applicable award agreement, including the schedule for vesting no later than March 15, 2029.