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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>As filed with the Securities and Exchange
Commission on February 21, 2019</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B></P>

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<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B></P>

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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>WASHINGTON, D.C. 20549</B><BR>
<BR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 18pt"><B>FORM S-8</B></FONT><BR>
<BR>
<FONT STYLE="font-size: 12pt"><B>REGISTRATION STATEMENT</B></FONT><BR>
<FONT STYLE="font-size: 12pt"><B>UNDER</B></FONT><BR>
<FONT STYLE="font-size: 12pt"><B>THE SECURITIES ACT OF 1933</B></FONT></P>

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<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>MARSH &amp; McLENNAN COMPANIES, INC.</B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Exact Name of Registrant as Specified in
Its Charter)</P>

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    <TD STYLE="width: 50%; font-size: 10pt; text-align: center"><B>Delaware</B><BR>
<B>(State or Other Jurisdiction of</B><BR>
<B>Incorporation or Organization)</B></TD>
    <TD STYLE="width: 50%; font-size: 10pt; text-align: center"><FONT STYLE="background-color: white"><B>36-2668272</B></FONT><BR>
<B>(I.R.S. Employer</B><BR>
<B>Identification No.)</B></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>1166 Avenue of the Americas</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>New York, New York 10036-2774</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(212) 345-5000</B><BR>
        <B>(<FONT STYLE="font-size: 10pt">Address, including zip code, and telephone number, including area code, of Registrant&rsquo;s
        principal executive offices</FONT>)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>MARSH &amp; McLENNAN COMPANIES 401(K)
SAVINGS &amp; INVESTMENT PLAN</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>MARSH &amp; McLENNAN AGENCY 401(K) SAVINGS
&amp; INVESTMENT PLAN</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Full Title of the Plan)<BR>
</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Katherine J. Brennan&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Marsh &amp; McLennan Companies, Inc.&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">1166 Avenue of the Americas&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">New York, New York 10036-2774&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Name and Address of Agent for Service)<BR>
</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(212) 345-5000<BR>
<FONT STYLE="font-size: 10pt">(Telephone Number, Including Area Code, of Agent for Service)</FONT><BR>
</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Indicate by check mark whether the registrant is a large
accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See
the definitions of &ldquo;large accelerated filer,&rdquo; &ldquo;accelerated filer,&rdquo; &ldquo;smaller reporting company&rdquo;
and &ldquo;emerging growth company&rdquo; in Rule 12b-2 of the Exchange Act.</B><BR>
</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

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    <TD STYLE="width: 70%"><B>Large accelerated filer </B>&#9746;<B></B></TD>
    <TD STYLE="width: 30%"><B>Accelerated filer </B>&#9744;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD><B>Non-accelerated filer </B>&#9744; <B>(Do not check if a smaller reporting company)</B></TD>
    <TD><B>Smaller reporting company </B>&#9744;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD><B>Emerging
Growth Company </B>&#9744;</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If an emerging growth company, indicate by check mark if the
registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards
provided pursuant to Section 7(a)(2)(B) of the Securities Act. &#9744;</P>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">CALCULATION OF REGISTRATION FEE</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

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<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 46%; border: Black 1pt solid; padding: 1pt 2pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; border-bottom: Black 0.5pt solid">Title
of Securities to be Registered&nbsp;</P></TD>
    <TD STYLE="width: 13%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Amount
to be Registered(1)&nbsp;</P></TD>
    <TD STYLE="width: 13%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Proposed
Maximum Offering Price Per Share(2)&nbsp;</P></TD>
    <TD STYLE="width: 14%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Proposed
Maximum Aggregate Offering Price(2)&nbsp;</P></TD>
    <TD STYLE="width: 14%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Amount
of<BR>
Registration Fee(3)&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-indent: 0in"><B>Common Stock, $1.00 par value, to be issued under the Marsh &amp; McLennan Companies 401(k) Savings &amp; Investment Plan</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>2,000,000</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>$90.35</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>$180,700,000</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>$21,900.84</B></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-indent: 0in"><B>Common Stock, $1.00 par value, to be issued under the Marsh &amp; McLennan Agency 401(k) Savings &amp; Investment Plan</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>500,000</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>$90.35</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>$45,175,000</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding: 1pt 2pt; font-size: 10pt; text-align: center"><B>$5,475.21</B></TD></TR>
</TABLE>

<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>This Registration Statement on Form S-8 (this &ldquo;Registration Statement&rdquo;) covers shares of Common Stock, par value
$1.00 per share (&ldquo;Common Stock&rdquo;) of Marsh &amp; McLennan Companies, Inc. (the &ldquo;Company&rdquo; or the &ldquo;Registrant&rdquo;)
issuable pursuant to (i) the Marsh and McLennan Companies 401(k) Savings &amp; Investment Plan, (ii) the Marsh &amp; McLennan Agency
401(k) Savings &amp; Investment Plan ((i) and (ii) together, the &ldquo;Plans&rdquo;), (iii) any additional shares of Common Stock
that become issuable under the Plans by reason of any stock dividend, stock split, or other similar transaction pursuant to Rule
416(a) under the Securities Act of 1933, as amended (the &ldquo;Securities Act&rdquo;), and (iv) pursuant to Rule 416(c) under
the Securities Act, an indeterminate amount of interests to be offered or sold pursuant to the Plans.</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(2)</TD><TD>Estimated pursuant to Rule 457(h) and Rule 457(c) under the Securities Act, solely for the purpose of computing the registration
fee, based on the average of the high and low prices reported for a share of Common Stock on the New York Stock Exchange on February
14, 2019.</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left">(3)</TD><TD>Rounded up to the nearest penny.</TD>
</TR></TABLE>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">EXPLANATORY NOTE</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; text-align: left"><FONT STYLE="font-weight: normal; background-color: white">This
Registration Statement has been prepared and filed pursuant to and in accordance with the requirements of General Instruction E
to Form S-8 for the purpose of registering an additional </FONT><FONT STYLE="font-weight: normal">2,500,000 <FONT STYLE="background-color: white">shares
of Common Stock that are issuable at any time or from time to time under the Plans.&nbsp;&nbsp;Pursuant to General Instruction
E, the contents of the Registration Statement on Form S-8 filed for the Plans with the Securities and Exchange Commission (the
&ldquo;Commission&rdquo;) on August 5, 2011 (Registration No. 333-176085), including the documents incorporated by reference therein,
are incorporated by reference into this Registration Statement, except as supplemented by the information set forth below.</FONT></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; text-align: left">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; text-align: left"><FONT STYLE="font-weight: normal; background-color: white">The
Plans are part of the same master trust.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; text-align: left">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">PART 1</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">The information specified in Item 1 and
Item 2 of Part I of Form S-8 is omitted from this filing in accordance with the provisions of Rule 428 under the Securities Act
and the introductory note to Part I of the Form S-8 instructions. The document containing the information specified in Part I will
be delivered to the participants in the Plan as required by Rule 428(b)(1).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">PART II</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">INFORMATION REQUIRED IN THE REGISTRATION
STATEMENT</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">Item 3. Incorporation of Documents by Reference</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">The following documents filed are incorporated
herein by reference:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company&rsquo;s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the Commission on February 21, 2019
(File No. 001-05998).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">(b) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Marsh &amp; McLennan Companies 401(k)
Savings &amp; Investment Plan Annual Report on Form 11-K for the fiscal year ended December 31, 2017.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">(c) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Marsh
&amp; McLennan Agency 401(k) Savings &amp; Investment Plan Annual Report on Form 11-K for the fiscal year ended December 31, 2017.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">(d) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company&rsquo;s current reports on Form 8-K filed after the fiscal year ended December 31, 2018.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">(e)&nbsp; The Company&rsquo;s Registration
Statement on Form 8-B dated May 22, 1969, as amended by an Amendment on Form 8, dated February 3, 1987, describing the Common Stock,
including any amendment or reports filed for the purpose of updating such description.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">In addition, all documents subsequently
filed by the Company pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange
Act&rdquo;), prior to the filing of a post-effective amendment to this Registration Statement which indicates that all securities
offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference
in this Registration Statement and to be a part hereof from the date of the filing of such documents.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Any statement contained in a document incorporated
or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration
Statement to the extent that a statement contained herein (or in any other subsequently filed document which also is incorporated
or deemed to be incorporated by reference herein), modifies or supersedes such statement. Any such statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">Item 5. Interests of Named Experts and Counsel</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">Item 8. Exhibits.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TR>
    <TD STYLE="vertical-align: bottom; width: 9%; padding-top: 1pt; padding-bottom: 1pt"><B>Exhibit</B><BR>
<B>Number</B></TD>
    <TD STYLE="vertical-align: top; width: 91%; padding-top: 1pt; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000006270908000150/ex3-1restatedcertofinc.htm">3.1</A></TD>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000006270908000150/ex3-1restatedcertofinc.htm">Restated Certificate of Incorporation of Marsh &amp; McLennan Companies, Inc. (incorporated by reference to the Company&rsquo;s Current Report on Form 8-K filed on July 18, 2008).*</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000006270917000002/mmcbylawsproxyaccessfinal0.htm">3.2</A></TD>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000006270917000002/mmcbylawsproxyaccessfinal0.htm">Amended and Restated Bylaws of Marsh &amp; McLennan Companies, Inc. (incorporated by reference to the Company&rsquo;s Current Report on Form 8-K filed on January 12, 2017).*</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex0401.htm" STYLE="color: Blue; text-decoration: underline">4.1</A></TD>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex0401.htm" STYLE="color: Blue; text-decoration: underline">Marsh &amp; McLennan Companies 401(k) Savings &amp; Investment Plan.</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex0402.htm" STYLE="color: Blue; text-decoration: underline">4.2</A></TD>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex0402.htm" STYLE="color: Blue; text-decoration: underline">Marsh &amp; McLennan Agency 401(k) Savings &amp; Investment Plan.</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex2301.htm" STYLE="color: Blue; text-decoration: underline">23.1</A></TD>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex2301.htm" STYLE="color: Blue; text-decoration: underline">Consent of Independent Registered Public Accounting Firm, Deloitte &amp; Touche LLP.</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex2302.htm" STYLE="color: Blue; text-decoration: underline">23.2</A></TD>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="dp102460_ex2302.htm" STYLE="color: Blue; text-decoration: underline">Consent of Independent Registered Public Accounting Firm, Deloitte &amp; Touche LLP.</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF=#poa" STYLE="color: Blue; text-decoration: underline">24</A></TD>
    <TD STYLE="vertical-align: top; padding-top: 1pt; padding-bottom: 1pt"><A HREF="#poa" STYLE="color: Blue; text-decoration: underline">Power of Attorney (included on the signature pages of this Registration Statement).</A></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">*Incorporated herein by reference</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 5.75pt 0pt 6.1pt; text-indent: 22.85pt">The use of original issuance
securities under this Registration Statement is not contemplated. If original issuance securities are hereafter offered and sold,
an opinion of counsel will be filed by amendment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 5.75pt 0pt 6.1pt; text-indent: 22.85pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 7.5pt 0pt 6.1pt; text-align: justify; text-indent: 22.85pt">The
undersigned registrant hereby undertakes: (i) to submit or has submitted the Plans and any amendments thereto to the Internal Revenue
Service (&ldquo;IRS&rdquo;) in a timely manner for the purpose of obtaining determinations that the form of the Plans meet the
qualification requirements under the Internal Revenue Code of 1986, as amended, and (ii) will make or has made all changes required
by the IRS in order to qualify the Plans.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 7.5pt 0pt 6.1pt; text-align: justify; text-indent: 22.85pt">&nbsp;</P>


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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SIGNATURES</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Pursuant to the requirements of the Securities
Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing
on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized,
in the City of New York, State of New York, on the 21st day of February, 2019.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left"><B>MARSH &amp; McLENNAN COMPANIES, INC. </B></TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: bottom; width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 27%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 6%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 6%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 4%">By:</TD>
    <TD STYLE="vertical-align: top; width: 52%; border-bottom: Black 1pt solid">/s/ Daniel S. Glaser</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Daniel S. Glaser</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Title:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Director, President and Chief Executive Officer</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Pursuant to the requirements of the Securities
Act of 1933, the persons who administer the Marsh &amp; McLennan Companies 401(k) Savings &amp; Investment Plan have duly caused
this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York,
State of New York, on the 21st day of February, 2019.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left"><B>MARSH &amp; McLENNAN COMPANIES<BR>
401(k) SAVINGS &amp; INVESTMENT PLAN </B></TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: bottom; width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 27%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 6%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 6%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 4%">By:</TD>
    <TD STYLE="vertical-align: top; width: 52%; border-bottom: Black 1pt solid">/s/ Alexander P. Voitovich</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alexander P. Voitovich</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="padding-left: 50.1pt; text-indent: -50.1pt">Title:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Authorized Representative of the Benefits Administration Committee</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Pursuant to the requirements of the Securities
Act of 1933, the persons who administer the Marsh &amp; McLennan Agency 401(k) Savings &amp; Investment Plan have duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, State
of New York, on the 21st day of February, 2019.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left"><B>MARSH &amp; McLENNAN AGENCY<BR>
401(k) SAVINGS &amp; INVESTMENT PLAN</B></TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: left">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: bottom; width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 27%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 6%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 6%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 4%">By:</TD>
    <TD STYLE="vertical-align: top; width: 52%; border-bottom: Black 1pt solid">/s/ Alexander P. Voitovich</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Alexander P. Voitovich</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="padding-left: 50.1pt; text-indent: -49.5pt">Title:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Authorized Representative of the Benefits Administration Committee</TD></TR>
</TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0"></P>

<P STYLE="margin: 0">&nbsp;</P>

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<P STYLE="margin: 0"></P>

<P STYLE="margin: 0">&nbsp;&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in"><B><A NAME="poa"></A>POWER OF ATTORNEY</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">The undersigned directors and officers of
the Marsh &amp; McLennan Companies, Inc. hereby appoint each of Katherine J. Brennan, Tiffany D. Wooley and Connor Kuratek as attorneys-in-fact
for the undersigned, with full power of substitution for, and in the name, place and stead of the undersigned, to sign and file
with the Securities and Exchange Commission under the Securities Act of 1933, any and all amendments (including post-effective
amendments) and exhibits to this registration statement on Form S-8 (or any other registration statement for the same offering
that is to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933) and any and all applications and
other documents to be filed with the Securities and Exchange Commission pertaining to the registration of the securities covered
hereby, with full power and authority to do and perform any and all acts and things whatsoever requisite and necessary or desirable,
hereby ratifying and confirming all that said attorney-in-fact, or his her substitute or substitutes, may lawfully do or cause
to be done by virtue hereof.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">Pursuant to the requirements of the Securities
Act of 1933, this registration statement has been signed by the following persons in the following capacities on February 21, 2019.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in"></P>

<P STYLE="margin: 0"></P>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="text-align: center; border-bottom: Black 1pt solid"><B>Signature</B></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center; border-bottom: Black 1pt solid"><B>Title</B></TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Daniel S. Glaser</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director, President and Chief Executive Officer </TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Daniel S. Glaser </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">(Principal Executive Officer)</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Mark C. McGivney</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Chief Financial Officer</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Mark C. McGivney &nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">(Principal Financial Officer)</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Stacy M. Mills</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Vice President and Controller</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 33%">Stacy M. Mills</TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="text-align: center">(Principal Accounting Officer)</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Anthony K. Anderson</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Anthony K. Anderson </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Oscar Fanjul</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Oscar Fanjul</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ H. Edward Hanway</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>H. Edward Hanway </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Deborah C. Hopkins</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Deborah C. Hopkins </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Elaine La Roche</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Elaine La Roche</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Steven A. Mills</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Steven A. Mills </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left; vertical-align: bottom">/s/ Bruce P. Nolop</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Bruce P. Nolop </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
</TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0">&nbsp;</P>

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<P STYLE="margin: 0"></P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0"></P>

<P STYLE="margin: 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid">/s/ Marc D. Oken</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 33%">Marc D. Oken </TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid">/s/ Morton O. Schapiro</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Morton O. Schapiro </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid">/s/ Lloyd M. Yates</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>Lloyd M. Yates </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="border-bottom: Black 1pt solid">/s/ R. David Yost</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>R. David Yost </TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
</TABLE>

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[{"type": "S-8", "sequence": "1", "filename": "dp102460_s8.htm", "description": "FORM S-8", "secsgml_size_bytes": 47561}]
{"company-data": {"conformed-name": "MARSH & MCLENNAN COMPANIES, INC.", "cik": "0000062709", "assigned-sic": "6411", "irs-number": "362668272", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-229776", "film-number": "19622525"}, "business-address": {"street1": "1166 AVENUE OF THE AMERICAS", "city": "NEW YORK", "state": "NY", "zip": "10036", "phone": "2123455000"}, "mail-address": {"street1": "1166 AVENUE OF THE AMERICAS", "city": "NEW YORK", "state": "NY", "zip": "10036"}, "former-company": [{"former-conformed-name": "MARSH & MCLENNAN COMPANIES INC", "date-changed": "19920703"}, {"former-conformed-name": "MARLENNAN CORP", "date-changed": "19760505"}]}
As filed with the Securities and Exchange
Commission on February 21, 2019
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
MARSH & McLENNAN COMPANIES, INC.
(Exact Name of Registrant as Specified in
Its Charter)
Delaware
(State or Other Jurisdiction of
Incorporation or Organization)
36-2668272
(I.R.S. Employer
Identification No.)
1166 Avenue of the Americas
New York, New York 10036-2774
(212) 345-5000
(
Address, including zip code, and telephone number, including area code, of Registrant's
        principal executive offices
)
MARSH & McLENNAN COMPANIES 401(K)
SAVINGS & INVESTMENT PLAN
MARSH & McLENNAN AGENCY 401(K) SAVINGS
& INVESTMENT PLAN
(Full Title of the Plan)
Katherine J. Brennan
Marsh & McLennan Companies, Inc.
1166 Avenue of the Americas
New York, New York 10036-2774
(Name and Address of Agent for Service)
(212) 345-5000
(Telephone Number, Including Area Code, of Agent for Service)
Indicate by check mark whether the registrant is a large
accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See
the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company"
and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer
☒
Accelerated filer
☐
Non-accelerated filer
☐
(Do not check if a smaller reporting company)
Smaller reporting company
☐
Emerging
Growth Company
☐
If an emerging growth company, indicate by check mark if the
registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards
provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐
CALCULATION OF REGISTRATION FEE
Title
of Securities to be Registered
Amount
to be Registered(1)
Proposed
Maximum Offering Price Per Share(2)
Proposed
Maximum Aggregate Offering Price(2)
Amount
of
Registration Fee(3)
Common Stock, $1.00 par value, to be issued under the Marsh & McLennan Companies 401(k) Savings & Investment Plan
2,000,000
$90.35
$180,700,000
$21,900.84
Common Stock, $1.00 par value, to be issued under the Marsh & McLennan Agency 401(k) Savings & Investment Plan
500,000
$90.35
$45,175,000
$5,475.21
(1)
This Registration Statement on Form S-8 (this "Registration Statement") covers shares of Common Stock, par value
$1.00 per share ("Common Stock") of Marsh & McLennan Companies, Inc. (the "Company" or the "Registrant")
issuable pursuant to (i) the Marsh and McLennan Companies 401(k) Savings & Investment Plan, (ii) the Marsh & McLennan Agency
401(k) Savings & Investment Plan ((i) and (ii) together, the "Plans"), (iii) any additional shares of Common Stock
that become issuable under the Plans by reason of any stock dividend, stock split, or other similar transaction pursuant to Rule
416(a) under the Securities Act of 1933, as amended (the "Securities Act"), and (iv) pursuant to Rule 416(c) under
the Securities Act, an indeterminate amount of interests to be offered or sold pursuant to the Plans.
(2)
Estimated pursuant to Rule 457(h) and Rule 457(c) under the Securities Act, solely for the purpose of computing the registration
fee, based on the average of the high and low prices reported for a share of Common Stock on the New York Stock Exchange on February
14, 2019.
(3)
Rounded up to the nearest penny.
EXPLANATORY NOTE
This
Registration Statement has been prepared and filed pursuant to and in accordance with the requirements of General Instruction E
to Form S-8 for the purpose of registering an additional
2,500,000
shares
of Common Stock that are issuable at any time or from time to time under the Plans.  Pursuant to General Instruction
E, the contents of the Registration Statement on Form S-8 filed for the Plans with the Securities and Exchange Commission (the
"Commission") on August 5, 2011 (Registration No. 333-176085), including the documents incorporated by reference therein,
are incorporated by reference into this Registration Statement, except as supplemented by the information set forth below.
The
Plans are part of the same master trust.
PART 1
The information specified in Item 1 and
Item 2 of Part I of Form S-8 is omitted from this filing in accordance with the provisions of Rule 428 under the Securities Act
and the introductory note to Part I of the Form S-8 instructions. The document containing the information specified in Part I will
be delivered to the participants in the Plan as required by Rule 428(b)(1).
PART II
INFORMATION REQUIRED IN THE REGISTRATION
STATEMENT
Item 3. Incorporation of Documents by Reference
The following documents filed are incorporated
herein by reference:
(a)       The
Company's Annual Report on Form 10-K for the year ended December 31, 2018, filed with the Commission on February 21, 2019
(File No. 001-05998).
(b)        Marsh & McLennan Companies 401(k)
Savings & Investment Plan Annual Report on Form 11-K for the fiscal year ended December 31, 2017.
(c)        Marsh
& McLennan Agency 401(k) Savings & Investment Plan Annual Report on Form 11-K for the fiscal year ended December 31, 2017.
(d)        The
Company's current reports on Form 8-K filed after the fiscal year ended December 31, 2018.
(e)  The Company's Registration
Statement on Form 8-B dated May 22, 1969, as amended by an Amendment on Form 8, dated February 3, 1987, describing the Common Stock,
including any amendment or reports filed for the purpose of updating such description.
In addition, all documents subsequently
filed by the Company pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), prior to the filing of a post-effective amendment to this Registration Statement which indicates that all securities
offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference
in this Registration Statement and to be a part hereof from the date of the filing of such documents.
Any statement contained in a document incorporated
or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration
Statement to the extent that a statement contained herein (or in any other subsequently filed document which also is incorporated
or deemed to be incorporated by reference herein), modifies or supersedes such statement. Any such statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.
Item 5. Interests of Named Experts and Counsel
Not applicable.
Item 8. Exhibits.
Exhibit
Number
3.1
Restated Certificate of Incorporation of Marsh & McLennan Companies, Inc. (incorporated by reference to the Company's Current Report on Form 8-K filed on July 18, 2008).*
3.2
Amended and Restated Bylaws of Marsh & McLennan Companies, Inc. (incorporated by reference to the Company's Current Report on Form 8-K filed on January 12, 2017).*
4.1
Marsh & McLennan Companies 401(k) Savings & Investment Plan.
4.2
Marsh & McLennan Agency 401(k) Savings & Investment Plan.
23.1
Consent of Independent Registered Public Accounting Firm, Deloitte & Touche LLP.
23.2
Consent of Independent Registered Public Accounting Firm, Deloitte & Touche LLP.
24
Power of Attorney (included on the signature pages of this Registration Statement).
*Incorporated herein by reference
The use of original issuance
securities under this Registration Statement is not contemplated. If original issuance securities are hereafter offered and sold,
an opinion of counsel will be filed by amendment.
The
undersigned registrant hereby undertakes: (i) to submit or has submitted the Plans and any amendments thereto to the Internal Revenue
Service ("IRS") in a timely manner for the purpose of obtaining determinations that the form of the Plans meet the
qualification requirements under the Internal Revenue Code of 1986, as amended, and (ii) will make or has made all changes required
by the IRS in order to qualify the Plans.
SIGNATURES
Pursuant to the requirements of the Securities
Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing
on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized,
in the City of New York, State of New York, on the 21st day of February, 2019.
MARSH & McLENNAN COMPANIES, INC.
By:
/s/ Daniel S. Glaser
Name:         Daniel S. Glaser
Title:           Director, President and Chief Executive Officer
Pursuant to the requirements of the Securities
Act of 1933, the persons who administer the Marsh & McLennan Companies 401(k) Savings & Investment Plan have duly caused
this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York,
State of New York, on the 21st day of February, 2019.
MARSH & McLENNAN COMPANIES
401(k) SAVINGS & INVESTMENT PLAN
By:
/s/ Alexander P. Voitovich
Name:         Alexander P. Voitovich
Title:           Authorized Representative of the Benefits Administration Committee
Pursuant to the requirements of the Securities
Act of 1933, the persons who administer the Marsh & McLennan Agency 401(k) Savings & Investment Plan have duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, State
of New York, on the 21st day of February, 2019.
MARSH & McLENNAN AGENCY
401(k) SAVINGS & INVESTMENT PLAN
By:
/s/ Alexander P. Voitovich
Name:         Alexander P. Voitovich
Title:           Authorized Representative of the Benefits Administration Committee
POWER OF ATTORNEY
The undersigned directors and officers of
the Marsh & McLennan Companies, Inc. hereby appoint each of Katherine J. Brennan, Tiffany D. Wooley and Connor Kuratek as attorneys-in-fact
for the undersigned, with full power of substitution for, and in the name, place and stead of the undersigned, to sign and file
with the Securities and Exchange Commission under the Securities Act of 1933, any and all amendments (including post-effective
amendments) and exhibits to this registration statement on Form S-8 (or any other registration statement for the same offering
that is to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933) and any and all applications and
other documents to be filed with the Securities and Exchange Commission pertaining to the registration of the securities covered
hereby, with full power and authority to do and perform any and all acts and things whatsoever requisite and necessary or desirable,
hereby ratifying and confirming all that said attorney-in-fact, or his her substitute or substitutes, may lawfully do or cause
to be done by virtue hereof.
Pursuant to the requirements of the Securities
Act of 1933, this registration statement has been signed by the following persons in the following capacities on February 21, 2019.
Signature
Title
/s/ Daniel S. Glaser
Director, President and Chief Executive Officer
Daniel S. Glaser
(Principal Executive Officer)
/s/ Mark C. McGivney
Chief Financial Officer
Mark C. McGivney
(Principal Financial Officer)
/s/ Stacy M. Mills
Vice President and Controller
Stacy M. Mills
(Principal Accounting Officer)
/s/ Anthony K. Anderson
Director
Anthony K. Anderson
/s/ Oscar Fanjul
Director
Oscar Fanjul
/s/ H. Edward Hanway
Director
H. Edward Hanway
/s/ Deborah C. Hopkins
Director
Deborah C. Hopkins
/s/ Elaine La Roche
Director
Elaine La Roche
/s/ Steven A. Mills
Director
Steven A. Mills
/s/ Bruce P. Nolop
Director
Bruce P. Nolop
/s/ Marc D. Oken
Director
Marc D. Oken
/s/ Morton O. Schapiro
Director
Morton O. Schapiro
/s/ Lloyd M. Yates
Director
Lloyd M. Yates
/s/ R. David Yost
Director
R. David Yost