AMEREN CORP — Director's Dealing 2012

Jan 19, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMEREN CORP (AEE)
CIK: 0001002910
Period of Report: 2012-01-17

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-01-17	Common Stock, $.01 Par Value	F	577	$28.89	Disposed	1052	Direct
2012-01-17	Common Stock, $.01 Par Value	M	996	—	Acquired	2048	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-01-17	Performance Units	$	M	1573	Disposed	2011-12-31	Common Stock (1573)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, $.01 Par Value	3058	Indirect

Footnotes

F1: Amount includes a total of 638 shares acquired either monthly through exempt purchases or quarterly through reinvested dividends from January through December 2011 at prices ranging from $26.91 to $33.41 per share.

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

F3: Amount includes a total of 40 shares acquired monthly through exempt purchases from January through December 2011 at prices ranging from $28.21 to $33.41 per share.

F4: 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.