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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * MUELLER MICHAEL G   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) President of Subsidiary (Last) (First) (Middle) P.O. BOX 66149 3. Date of Earliest Transaction (Month/Day/Year) 01/18/2011 (Street) ST. LOUIS, MO 63166-6149 4. If Amendment, Date 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 (City) (State) (Zip) 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               1,738 (1) I By 401(K) Common Stock, $.01 Par Value               127 (2) I By ESOP Common Stock, $.01 Par Value               67 (3) I Custodian for Daughter #1 Common Stock, $.01 Par Value               80 (4) I Custodian for Daughter #2 Common Stock, $.01 Par Value               57 (5) I Custodian for Son Common Stock, $.01 Par Value 01/18/2011   F   388 (7) D $ 28.19 8,746 (6) D   Common Stock, $.01 Par Value 01/18/2011   M   670 A $ 0 9,416 D

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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 Underlying Securities (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 of Derivative Security: 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

Performance Units

(8)

01/18/2011

M

1,058 (9)

(8)

12/31/2010

Common Stock

1,058 (9)

$ 0

1,037

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MUELLER MICHAEL G P.O. BOX 66149 ST. LOUIS, MO 63166-6149				President of Subsidiary

Signatures

G. L. Waters, Asst. Secy. of Ameren Corporation, attorney in fact for Michael G. Mueller		01/20/2011
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Amount includes a total of 211 shares acquired monthly from January through December 2010 at prices ranging from $24.00 to $29.60 per share.
(2)	Amount includes a total of 7 shares acquired during the first through fourth quarters of 2010 through reinvested dividends at prices ranging from $24.00 to $28.45 per share.
(3)	Amount includes a total of 3 shares acquired during the first through fourth quarters of 2010 through reinvested dividends at prices ranging from $24.00 to $28.45 per share.
(4)	Amount includes a total of 4 shares acquired during the first through fourth quarters of 2010 through reinvested dividends at prices ranging from $24.00 to $28.45 per share.
(5)	Amount includes a total of 3 shares acquired during the first through fourth quarters of 2010 through reinvested dividends at prices ranging from $24.00 to $28.45 per share.
(6)	Amount includes a total of 480 shares acquired during the first through fourth quarters of 2010 through reinvested dividends at prices ranging from $24.00 to $28.45 per share.
(7)	Sold to cover Mr. Mueller's tax liability for acquiring performance shares that have vested.
(8)	Each performance unit represents a contingent right to receive one share of Ameren common stock. The performance units vest after a two year holding period.
(9)	Amount adjusted for an understated amount of 67 units which had been inaccurately reported on previous filings.

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