Ameren SVP reports 1,296-share tax disposition

Ameren Corp senior vice president Theresa A. Shaw reported a tax-related share disposition.

Rhea-AI Filing Summary

Ameren Corp senior vice president Theresa A. Shaw reported a tax-related share disposition. On February 27, 2026, 1,296 shares of Ameren common stock were withheld by the company at $113.28 per share to cover tax obligations from vesting performance and restricted stock units, rather than being sold in the open market. After this withholding, she directly held 34,397 Ameren shares, and an additional 897 share equivalents were held indirectly through a 401(k) plan as of February 28, 2026.

Insider Trade Summary

Exercise Price or Tax Liability: 1,296 shares

Exercise Price or Tax Liability 2 txns

Insider Shaw Theresa A

Role SVP and CATO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock, $.01 Par Value	1,296	$113.28	$147K
holding	Common Stock, $.01 Par Value	--	--	--

Holdings After Transaction: Common Stock, $.01 Par Value — 34,397 shares (Direct); Common Stock, $.01 Par Value — 897 shares (Indirect, By 401(k))

Footnotes (2)

1. F1. 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. F2. Shares withheld by the issuer to satisfy tax withholding obligations arising in connection with the vesting of performance share units and restricted stock units.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Ameren (AEE) executive Theresa A. Shaw report?

Theresa A. Shaw reported a tax-withholding disposition of 1,296 Ameren shares. The shares were withheld by the company to satisfy tax obligations from vesting performance share units and restricted stock units, rather than sold in the open market.

At what price were Theresa A. Shaw’s Ameren (AEE) shares withheld for taxes?

The 1,296 Ameren shares were withheld at $113.28 per share. This value reflects the price used to cover tax obligations arising from the vesting of performance share units and restricted stock units granted to the executive.

How many Ameren (AEE) shares does Theresa A. Shaw hold after the Form 4 transaction?

After the tax-withholding transaction, Theresa A. Shaw directly held 34,397 Ameren common shares. She also had 897 additional share equivalents held indirectly through a unitized stock fund in the Ameren Corporation Savings Investment Plan.

Was Theresa A. Shaw’s Ameren (AEE) Form 4 transaction an open-market sale?

No, the transaction was not an open-market sale. The 1,296 shares were withheld by Ameren to satisfy tax withholding obligations tied to vesting equity awards, classified as a tax-withholding disposition under transaction code F.

What indirect Ameren (AEE) holdings does Theresa A. Shaw report?

Theresa A. Shaw reports 897 Ameren share equivalents held indirectly. These are in a unitized stock fund within the Ameren Corporation Savings Investment Plan, representing her interest in Ameren stock through a 401(k)-type retirement plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/03/2026 - 04:46 PM EST Learn about SEC filing dates

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^*

Shaw Theresa A

(Last) (First) (Middle)

1901 CHOUTEAU AVENUE

P.O. BOX 66149

(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
X	Officer (give title below)		Other (specify below)
	SVP and CATO

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								897(1)	I	By 401(k)
Common Stock, $.01 Par Value	02/27/2026		F		1,296	D	$113.28	34,397(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 Theresa A. Shaw	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.