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STATES</font></div>
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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-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Washington,
D.C. 20549</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">_____________________</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">FORM
8-K</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; 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-WEIGHT: bold; 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-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Securities
Exchange Act of 1934</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
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<tr>
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      of report (Date of earliest event reported)<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;</font>March
      16,&#160;2010</font></div>
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            </tr></table>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 9pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 9pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 9pt" align="left">&#160;</div>
      <div>
        <table cellpadding="0" cellspacing="0" width="100%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr>
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      &amp; McLennan Companies, Inc.</font></div>
              </td>
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              <td valign="top" width="98%">
                <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>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br><br>&#160;</div>
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<tr>
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      No.)</font></div>
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<tr>
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      Avenue of the Americas, New York, NY</font></div>
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      of Principal Executive Offices)</font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></div>
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      Code)</font></div>
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      <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><br>&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 9pt" align="left">
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<tr>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Registrant&#8217;s
      telephone number, including area code<font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font id="TAB2" style="LETTER-SPACING: 9pt">&#160;&#160;&#160;</font><font style="DISPLAY: inline">(212) 345-5000</font></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 9pt" align="left"><br>&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 18pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>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:</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr valign="top">
              <td style="WIDTH: 27.7pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#61551;</font></div>
              </td>
              <td>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Written
      communications pursuant to Rule 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%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr valign="top">
              <td style="WIDTH: 27.7pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#61551;</font></div>
              </td>
              <td>
                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Soliciting
      material pursuant to Rule 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%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr valign="top">
              <td style="WIDTH: 27.7pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#61551;</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 14d-2(b) under the Exchange Act (17 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%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr valign="top">
              <td style="WIDTH: 27.7pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#61551;</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 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))</font></div>
              </td>
            </tr></table>
      </div><br>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; WIDTH: 100%; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">&#160;
</font></div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">&#160;
</font></div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">&#160;
</font></div>
        </div>
      </div><br>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
8.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Other
Events</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 32.4pt"></font>The following documents are filed
with reference to the Registration Statement (No. 333-163405) on Form S-4 (the
&#8220;Registration Statement&#8221;), filed by Marsh &amp; McLennan Companies, Inc. with
the Securities and Exchange Commission on November 30, 2009. Such documents are
filed in connection with the issuance of shares under the Registration Statement
pursuant to a Stock Purchase and Plan of Reorganization dated as of March 16,
2010.</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 4.5pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Item
9.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Financial
Statements and Exhibits</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(d)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
Exhibits</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div>
        <table cellpadding="0" cellspacing="0" width="100%" style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">
<tr>
              <td align="left" valign="top" width="5%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">5.1</font></div>
              </td>
              <td align="left" valign="top" width="95%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Opinion
      of the Deputy General Counsel of Marsh &amp; McLennan Companies,
      Inc.</font></div>
              </td>
            </tr></table>
      </div>
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<tr>
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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="left">&#160;</div>
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<tr>
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                <td colspan="2" valign="top" width="33%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; FONT-WEIGHT: bold">MARCH &amp; McLENNAN COMPANIES,
      INC.</font></font></td>
                <td valign="top" width="17%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
              </tr><tr>
                <td valign="top" width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="3%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="30%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="17%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
              </tr><tr>
                <td align="left" valign="top" width="50%" style="BORDER-BOTTOM: #ffffff solid">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></div>
                </td>
                <td valign="top" width="3%" style="BORDER-BOTTOM: #ffffff solid">
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      Fato</font></td>
                <td valign="top" width="17%" style="BORDER-BOTTOM: #ffffff solid">&#160;</td>
              </tr><tr>
                <td valign="top" width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="3%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td align="left" nowrap valign="bottom" width="30%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Name:
      Luciana Fato&#160;</font></td>
                <td valign="top" width="17%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
              </tr><tr>
                <td valign="top" width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="3%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="30%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Title:&#160;&#160;
      Deputy General Counsel &amp;&#160;</font></td>
                <td valign="top" width="17%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
              </tr><tr>
                <td valign="top" width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="3%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                <td valign="top" width="30%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Corporate
      Secretary</font></td>
                <td valign="top" width="17%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
              </tr></table>
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17, 2010</font></div><br>
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        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">&#160;
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          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">&#160;
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INDEX</font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
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No.</font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
<font style="DISPLAY: inline; TEXT-DECORATION: underline">Exhibit</font></font></div>
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<tr>
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      Inc.</font></div>
              </td>
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      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</font></div>
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<tr>
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      of the Deputy General Counsel of Marsh &amp; McLennan Companies, Inc.
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              </td>
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      </div>
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f8kmarch16-2010mma.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)
March
      16, 2010
Marsh
      & McLennan Companies, Inc.
(Exact
      Name of Registrant as Specified in
Charter)
Delaware
1-5998
36-2668272
(State
      or Other Jurisdiction of Incorporation)
(Commission
      File Number)
(IRS
      Employer
Identification
      No.)
1166
      Avenue of the Americas, New York, NY
10036
(Address
      of Principal Executive Offices)
(Zip
      Code)
Registrant's
      telephone number, including area code
(212) 345-5000
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
8.01                      Other
Events
The following documents are filed
with reference to the Registration Statement (No. 333-163405) on Form S-4 (the
"Registration Statement"), filed by Marsh & McLennan Companies, Inc. with
the Securities and Exchange Commission on November 30, 2009. Such documents are
filed in connection with the issuance of shares under the Registration Statement
pursuant to a Stock Purchase and Plan of Reorganization dated as of March 16,
2010.
Item
9.01                      Financial
Statements and Exhibits
(d)          
Exhibits
5.1
Opinion
      of the Deputy General Counsel of Marsh & McLennan Companies,
      Inc.
23.1
Consent
      of the Deputy General Counsel of Marsh & McLennan Companies, Inc.
      (contained in Exhibit 5.1).
SIGNATURES
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.
MARCH & McLENNAN COMPANIES,
      INC.
By:
/s/ Luciana
      Fato
Name:
      Luciana Fato
Title:  
      Deputy General Counsel &
Corporate
      Secretary
Date:           March
17, 2010
EXHIBIT
INDEX
Exhibit
No.
Exhibit
5.1
Opinion
      of the Deputy General Counsel of Marsh & McLennan Companies,
      Inc.
23.1
Consent
      of the Deputy General Counsel of Marsh & McLennan Companies, Inc.
      (contained in Exhibit 5.1).