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          <div>&#160;</div>
        </div>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">United
        States</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Securities
        and Exchange Commission</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Washington,
        D.C.&#160;&#160;20549</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">_______________________</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Form
        8-K</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Current
        Report</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Pursuant
        to Section 13 or 15(d) of the</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Securities
        Exchange Act of 1934</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Date
        of
        Report (Date of earliest event reported):</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">November
        15, 2007</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Ameren
        Corporation</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Exact
        Name of Registrant as Specified in Charter)</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
      <div align="center">
        <table cellpadding="0" cellspacing="0" width="90%">

            <tr>
              <td valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Missouri</font></div>
              </td>
              <td valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">1-14756</font></div>
              </td>
              <td valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">43-1723446</font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(State
                  or Other</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Jurisdiction
                  of Incorporation)</font></div>
              </td>
              <td valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(Commission</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">File
                  Number)</font></div>
              </td>
              <td valign="top" width="30%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">(I.R.S.
                  Employer</font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Identification
                  No.)</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div align="center">&#160;</div>
      <div align="center">
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">1901
          Chouteau Avenue, St. Louis, Missouri 63103</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Address
          of principal executive offices and Zip Code)</font></div>
      </div>
      <div>&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Registrant&#8217;s
        telephone number, including area code:&#160;&#160;&#160;&#160;&#160;(314)
        621-3222</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Check
        the
        appropriate box below if the Form&#160;8-K filing is intended to simultaneously
        satisfy the filing obligation of the registrant under any of the following
        provisions:</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div align="center">
        <table border="0" cellpadding="0" cellspacing="0" width="100%">

            <tr valign="top">
              <td style="WIDTH: 45.35pt">
                <div style="MARGIN-LEFT: 18pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">[&#160;
                  ]</font></div>
              </td>
              <td>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman;">Written
                  communications pursuant to Rule&#160;425 under the Securities Act (17 CFR
                  230.425)</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

            <tr valign="top">
              <td style="WIDTH: 45pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">[&#160;
                  ]</font></div>
              </td>
              <td>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Soliciting
                  material pursuant to Rule&#160;14a-12 under the Exchange Act (17 CFR
                  240.14a-12)</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

            <tr valign="top">
              <td style="WIDTH: 45pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">[&#160;
                  ]</font></div>
              </td>
              <td>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Pre-commencement
                  communications pursuant to Rule&#160;14d-2(b) under the Exchange Act
                  (17&#160;CFR 240.14d-2(b))</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

            <tr valign="top">
              <td style="WIDTH: 45pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 18pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">[&#160;
                  ]</font></div>
              </td>
              <td>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Pre-commencement
                  communications pursuant to Rule&#160;13e-4(c) under the Exchange Act
                  (17&#160;CFR 240.13e-4(c))</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div>&#160;</div>
        <div>
          <div>&#160;</div><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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            <div id="GLFTR" style="WIDTH: 100%" align="left">
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            <div style="WIDTH: 100%; TEXT-ALIGN: center">
            </div>
            <div style="WIDTH: 100%; TEXT-ALIGN: center">
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            </div>
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          <div id="HDR">
            <div id="GLHDR" style="WIDTH: 100%" align="right">
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        </div>
        <div><br></div>
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      <div><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

            <tr valign="top">
              <td style="WIDTH: 84px">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Item&#160;5.04.</font></div>
              </td>
              <td width="902">
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Temporary
                  Suspension of Trading under Registrant&#8217;s Employee Benefit
                  Plans.</font></div>
              </td>
            </tr>

        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">On
        November 15, 2007, Ameren Corporation (the &#8220;Company&#8221;) sent a notice to its
        directors and officers informing them of a blackout period under the Ameren
        Corporation Savings Investment Plan (the &#8220;Plan&#8221;).&#160;&#160;The blackout period
        is being implemented in connection with the transition of the administrative
        functions of the Plan to a new plan administrator and trustee.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">The
        blackout period will be in effect beginning 3:00 p.m. CST on December&#160;18,
        2007 and is expected to end the week of January&#160;6, 2008.&#160;&#160;During
        this time, and for a period of two years after the blackout period has ended,
        directors and officers can determine whether the blackout period has ended
        by
        going to www.myAmeren.com or calling the Ameren Resource Center at
        (866)&#160;367-5236 or (877) 769-2637.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">During
        the blackout period, each director and officer is prohibited from, directly
        or
        indirectly, purchasing, selling or otherwise acquiring or transferring any
        equity security of the Company that was acquired in connection with the
        director&#8217;s or officer&#8217;s service or employment as a director or officer, except
        pursuant to a limited number of exceptions.&#160;&#160;The term equity security
        includes, without limitation, the Company&#8217;s common stock, options to purchase
        the Company&#8217;s common stock and other derivative securities which derive their
        value from the Company&#8217;s common stock.&#160;&#160;At the end of the Plan
        blackout period, directors and officers will be permitted to resume transactions
        in such securities, subject to the requirements of the Company&#8217;s Section 16
        Trading Reporting Program.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Please
        contact the Company&#8217;s Employee Benefits Department by mail at Ameren
        Corporation, 1901 Chouteau Avenue, St. Louis, Missouri 63103 or by telephone
        at
        the numbers listed above with any questions regarding this blackout
        period.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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          <div id="GLFTR" style="WIDTH: 100%" align="left">
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          <div style="WIDTH: 100%; TEXT-ALIGN: center">
          </div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
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          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">SIGNATURE</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Pursuant
        to the requirements of the Securities Exchange Act of 1934, the registrant
        has
        duly caused this report to be signed on its behalf by the undersigned hereunto
        duly authorized.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">
        <div><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

              <tr valign="top">
                <td style="WIDTH: 247.7pt">
                  <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Date:&#160;
                    November 15, 2007</font></div>
                </td>
                <td>
                  <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 90pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">Ameren
                    Corporation</font></div>
                </td>
              </tr>

          </table>
        </div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

              <tr valign="top">
                <td style="WIDTH: 247.7pt">
                  <div>&#160;</div>
                </td>
                <td>
                  <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 90pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">(Registrant)</font></div>
                </td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

              <tr valign="top">
                <td style="WIDTH: 248.4pt">
                  <div>&#160;</div>
                </td>
                <td>
                  <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 90pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">By
                    <u>/s/ Martin J.
                    Lyons&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
                    </u></font></div>
                </td>
              </tr>

          </table>
        </div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

              <tr valign="top">
                <td style="WIDTH: 248.4pt">
                  <div>&#160;</div>
                </td>
                <td>
                  <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 99pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;Martin
                    J. Lyons</font></div>
                </td>
              </tr>

          </table>
        </div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

              <tr valign="top">
                <td style="WIDTH: 248.4pt">
                  <div>&#160;</div>
                </td>
                <td>
                  <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 99pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;Vice
                    President and Controller</font></div>
                </td>
              </tr>

          </table>
        </div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">

              <tr valign="top">
                <td style="WIDTH: 248.4pt">
                  <div>&#160;</div>
                </td>
                <td>
                  <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 99pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;(Principal
                    Accounting Officer)</font></div>
                </td>
              </tr>

          </table>
        </div>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>&#160;</div>
      <div>&#160;</div>
      <div>&#160;</div>
      <div>&#160;</div>
      <div>&#160;</div>
      <div>&#160;</div>
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{"company-data": {"conformed-name": "AMEREN CORP", "cik": "0001002910", "assigned-sic": "4931", "irs-number": "431723446", "state-of-incorporation": "MO", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-14756", "film-number": "071249722"}, "business-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63166-6149", "phone": "314-621-3222"}, "mail-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63103"}}
ameren8k11152007.htm
United
        States
Securities
        and Exchange Commission
Washington,
        D.C.  20549
_______________________
Form
        8-K
Current
        Report
Pursuant
        to Section 13 or 15(d) of the
Securities
        Exchange Act of 1934
Date
        of
        Report (Date of earliest event reported):
November
        15, 2007
Ameren
        Corporation
(Exact
        Name of Registrant as Specified in Charter)
Missouri
1-14756
43-1723446
(State
                  or Other
Jurisdiction
                  of Incorporation)
(Commission
File
                  Number)
(I.R.S.
                  Employer
Identification
                  No.)
1901
          Chouteau Avenue, St. Louis, Missouri 63103
(Address
          of principal executive offices and Zip Code)
Registrant's
        telephone number, including area code:     (314)
        621-3222
Check
        the
        appropriate box below if the Form 8-K filing is intended to simultaneously
        satisfy the filing obligation of the registrant under any of the following
        provisions:
[ 
                  ]
Written
                  communications pursuant to Rule 425 under the Securities Act (17 CFR
                  230.425)
[ 
                  ]
Soliciting
                  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
                  240.14a-12)
[ 
                  ]
Pre-commencement
                  communications pursuant to Rule 14d-2(b) under the Exchange Act
                  (17 CFR 240.14d-2(b))
[ 
                  ]
Pre-commencement
                  communications pursuant to Rule 13e-4(c) under the Exchange Act
                  (17 CFR 240.13e-4(c))
Item 5.04.
Temporary
                  Suspension of Trading under Registrant's Employee Benefit
                  Plans.
On
        November 15, 2007, Ameren Corporation (the "Company") sent a notice to its
        directors and officers informing them of a blackout period under the Ameren
        Corporation Savings Investment Plan (the "Plan").  The blackout period
        is being implemented in connection with the transition of the administrative
        functions of the Plan to a new plan administrator and trustee.
The
        blackout period will be in effect beginning 3:00 p.m. CST on December 18,
        2007 and is expected to end the week of January 6, 2008.  During
        this time, and for a period of two years after the blackout period has ended,
        directors and officers can determine whether the blackout period has ended
        by
        going to www.myAmeren.com or calling the Ameren Resource Center at
        (866) 367-5236 or (877) 769-2637.
During
        the blackout period, each director and officer is prohibited from, directly
        or
        indirectly, purchasing, selling or otherwise acquiring or transferring any
        equity security of the Company that was acquired in connection with the
        director's or officer's service or employment as a director or officer, except
        pursuant to a limited number of exceptions.  The term equity security
        includes, without limitation, the Company's common stock, options to purchase
        the Company's common stock and other derivative securities which derive their
        value from the Company's common stock.  At the end of the Plan
        blackout period, directors and officers will be permitted to resume transactions
        in such securities, subject to the requirements of the Company's Section 16
        Trading Reporting Program.
Please
        contact the Company's Employee Benefits Department by mail at Ameren
        Corporation, 1901 Chouteau Avenue, St. Louis, Missouri 63103 or by telephone
        at
        the numbers listed above with any questions regarding this blackout
        period.
SIGNATURE
Pursuant
        to the requirements of the Securities Exchange Act of 1934, the registrant
        has
        duly caused this report to be signed on its behalf by the undersigned hereunto
        duly authorized.
Date: 
                    November 15, 2007
Ameren
                    Corporation
(Registrant)
By
/s/ Martin J.
                    Lyons
Martin
                    J. Lyons
Vice
                    President and Controller
(Principal
                    Accounting Officer)