AMEREN CORP — Director's Dealing 2011

Jan 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMEREN CORP (AEE)
CIK: 0001002910
Period of Report: 2011-01-18

Reporting Person: Heflin Adam C (Sr. Vice Pres. of Subsidiary)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-01-18	Common Stock, $.01 Par Value	F	585	$28.19	Disposed	0	Direct
2011-01-18	Common Stock, $.01 Par Value	M	1011	—	Acquired	1011	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-01-18	Performance Units	$	M	1596	Disposed	2010-12-31	Common Stock (1596)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, $.01 Par Value	2420	Indirect

Footnotes

F1: Amount includes a total of 704 shares acquired either monthly through exempt purchases or quarterly through reinvested dividends from January through December 2010 at prices ranging from $24.00 to $29.60 per share.

F2: Sold to cover Mr. Heflin's tax liability for acquiring performance shares that have vested.

F3: 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.