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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 July 31, 2020</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>&nbsp;</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>
</P>

<P STYLE="font: 12pt 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-align: center"><FONT STYLE="font-size: 18pt"><B>FORM S-8</B><BR>
<BR>
</FONT><FONT STYLE="font-size: 12pt"><B>REGISTRATION STATEMENT<BR>
UNDER<BR>
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></P>

<P STYLE="font: 12pt 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">(Exact Name of Registrant as Specified in
Its Charter)</P>

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

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    <TD STYLE="width: 50%; font-size: 10pt; text-align: center"><B>Delaware<BR>
(State or Other Jurisdiction of<BR>
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><B><BR>
(I.R.S. Employer<BR>
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>&nbsp;</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<BR>
        (<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"></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>MARSH &amp; McLENNAN COMPANIES, INC.</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>2020 INCENTIVE AND STOCK AWARD PLAN</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">(Full Title of the Plan)<BR>
</P>

<P STYLE="font: 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-align: center">Katherine J. Brennan</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">Marsh &amp; McLennan Companies, Inc.</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">1166 Avenue of the Americas</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">New York, New York 10036-2774</P>

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

<P STYLE="font: 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-align: center">(212) 345-5000<BR>
<FONT STYLE="font-size: 10pt">(Telephone Number, Including Area Code, of Agent for Service)</FONT><B><BR>
</B></P>

<P STYLE="font: 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"><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.<BR>
</B></P>

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

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 67%; font-size: 10pt"><B>Large accelerated filer </B>&#9746;</TD>
    <TD STYLE="width: 33%; font-size: 10pt"><B>Accelerated filer </B>&#9744;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt"><B>Non-accelerated filer </B>&#9744;<B>&nbsp;(Do not check if a smaller reporting company)</B></TD>
    <TD STYLE="font-size: 10pt"><B>Smaller reporting company </B>&#9744;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt"><B>Emerging Growth Company </B>&#9744;</TD></TR>
</TABLE>

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

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    <TD STYLE="padding-right: 4pt; padding-left: 4pt; width: 34%; border: Black 1pt solid">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left">Title
of Securities to be Registered&nbsp;</P></TD>
    <TD STYLE="padding-right: 4pt; width: 15%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 4pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Amount
to be Registered(1)&nbsp;</P></TD>
    <TD STYLE="padding-right: 4pt; width: 17%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 4pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Proposed
Maximum Offering Price Per Share(2)&nbsp;</P></TD>
    <TD STYLE="padding-right: 4pt; width: 17%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 4pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Proposed
Maximum Aggregate Offering Price(2)&nbsp;</P></TD>
    <TD STYLE="padding-right: 4pt; width: 17%; border-top: Black 1pt solid; border-right: Black 1pt solid; border-bottom: Black 1pt solid; padding-left: 4pt">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Amount
of<BR>
Registration Fee(3)&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-left: 4pt; border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: Black 1pt solid; font-size: 10pt; text-indent: 0in"><B>Common Stock, $1.00 par value</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt; text-align: center"><B>20,000,000</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt; text-align: center"><B>$114.05</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt; text-align: center"><B>$2,281,000,000</B></TD>
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt; text-align: center"><B>$296,074</B></TD></TR>
</TABLE>

<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>
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<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 the Company&rsquo;s 2020 Incentive and Stock Award Plan (the &ldquo;Plan&rdquo;), and any additional shares
of Common Stock that become issuable under the Plan 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;).</TD></TR></TABLE>

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

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<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 July
27, 2020.</TD></TR></TABLE>

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

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<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>

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


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<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-align: center; text-indent: 0in"><B>INFORMATION REQUIRED
IN THE SECTION 10(a) PROSPECTUS</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: 0.5in">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: 0.5in">&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;The
Company&rsquo;s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the U.S. Securities and Exchange Commission
(the &ldquo;Commission&rdquo;) on February 20, 2020 (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;The Company&rsquo;s current reports
on Form 8-K filed after the fiscal year ended December 31, 2019.</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;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. The Registrant is not incorporating
by reference any document or portion thereof, whether specifically listed above or to be filed in the future, that is not deemed
&ldquo;filed&rdquo; with the Commission.</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: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">Item 4. Description of Securities</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: 0in">Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&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: 0in">Katherine J. Brennan, Deputy General Counsel,
Corporate Secretary &amp; Chief Compliance Officer of the Company will pass upon the validity of the offered securities. Ms. Brennan
is eligible to participate in the Plan.</P>

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

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">Item 6. Indemnification of Directors and Officers.</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: 24.5pt; background-color: white">Section 145 of
the General Corporation Law of the State of Delaware (the &ldquo;DGCL&rdquo;) provides that a corporation may indemnify directors
and officers, as well as employees and other individuals, against expenses (including attorneys&rsquo; fees), judgments, fines
and amounts paid in settlement actually and reasonably incurred by such person in connection with any threatened, pending or completed
actions, suits or proceedings in which such</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt; background-color: white">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">person is made a party by reason of
such person being or having been a director, officer, employee or agent of the corporation. The DGCL provides that Section 145
is not exclusive of other rights to which those seeking indemnification may be entitled under any bylaw, agreement, vote of stockholders
or disinterested directors or otherwise. Section 6.01 of the Company&rsquo;s amended and restated bylaws provides for indemnification
by the Company of its directors, officers and employees to the fullest extent permitted by the DGCL.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt; background-color: white">Section 102(b)(7)
of the DGCL permits a corporation to provide in its certificate of incorporation that a director of the corporation shall not be
personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except
for liability for any breach of the director&rsquo;s duty of loyalty to the corporation or its stockholders, for acts or omissions
not in good faith or which involve intentional misconduct or a knowing violation of law, for unlawful payments of dividends or
unlawful stock purchases, redemptions or other distributions, or for any transaction from which the director derived an improper
personal benefit. The Company&rsquo;s restated certificate of incorporation provides for such limitation of liability.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt; background-color: white">The Company maintains
standard policies of insurance under which coverage is provided to its directors and officers against loss arising from claims
made by reason of breach of duty, misstatement, error or omission committed in their capacity as directors or officers of the Company.
Such policies of insurance also provide coverage to the Company with respect to payments which may be made by the Company to such
officers and directors pursuant to the above indemnification provision or otherwise as a matter of law.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 24.5pt; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in"><B>Item 7. Exemption from Registration Claimed.</B></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">Not applicable.</P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: bottom; width: 9%"><B>Exhibit<BR>
Number</B></TD>
    <TD STYLE="vertical-align: bottom; width: 2%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 89%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000006270908000150/ex3-1restatedcertofinc.htm">4.1</A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><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"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000006270917000002/mmcbylawsproxyaccessfinal0.htm">4.2</A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><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"><A HREF="dp133194_ex0501.htm">5.1</A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><A HREF="dp133194_ex0501.htm">Opinion of Katherine J. Brennan.</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><A HREF="dp133194_ex2301.htm">23.1</A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><A HREF="dp133194_ex2301.htm">Consent of Independent Registered Public Accounting Firm, Deloitte &amp; Touche LLP.</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><A HREF="dp133194_ex0501.htm">23.2</A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><A HREF="dp133194_ex0501.htm">Consent of Counsel (included in Exhibit 5.1).</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><A HREF="#poa">24</A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><A HREF="#poa">Power of Attorney (included on the signature pages of this Registration Statement).</A></TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000119312520098080/d821972ddef14a.htm">99.1</A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><A HREF="http://www.sec.gov/Archives/edgar/data/62709/000119312520098080/d821972ddef14a.htm">Marsh &amp; McLennan Companies, Inc. 2020 Incentive and Stock Award Plan (incorporated by reference from Exhibit C to the Registrant&rsquo;s Definitive Proxy Statement on Schedule 14A filed on April 3, 2020).* </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 0; text-indent: 0in"><B>Item 9. Undertakings</B>.</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: 0.25in">(a)&nbsp;&nbsp;&nbsp;The
undersigned Registrant hereby undertakes:</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 0pt 0.25in; text-indent: 0.25in">(1)&nbsp;&nbsp;&nbsp;To
file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.25in">(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
include any prospectus required by Section 10(a)(3) of the Securities Act;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.25in">(ii)&nbsp;&nbsp;&nbsp;&nbsp;To
reflect in the prospectus any facts or events arising after the effective date of this Registration Statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set
forth in this Registration Statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if
the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high
end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.25in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">pursuant to Rule 424(b) if, in the
aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set
forth in the &ldquo;Calculation of Registration Fee&rdquo; table in this registration statement; and</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.25in">(iii)&nbsp;&nbsp;&nbsp;To
include any material information with respect to the Plans not previously disclosed in this Registration Statement or any material
change to such information in this Registration Statement;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0in"><I>provided</I>, <I>however</I>,
that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in periodic reports filed with or furnished to the Commission by the Registrant pursuant to Section
13 or Section 15(d) of the Exchange Act that are incorporated by reference in this Registration Statement.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.25in">(2)&nbsp;&nbsp;&nbsp;That,
for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall
be deemed to be the initial <I>bona fide</I> offering thereof.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.25in">(3)&nbsp;&nbsp;&nbsp;To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the
termination of the offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; 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;The
undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing
of the Registrant&rsquo;s annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable,
each filing of an employee benefit plan&rsquo;s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated
by reference in this Registration Statement shall be deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be the initial <I>bona fide</I> offering thereof.</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;Insofar
as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the provisions referenced in Item&nbsp;6 of this Registration Statement, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities
(other than the payment by the Registrant of expenses incurred or paid by a director, officer, or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection
with the securities being registered hereunder, the Registrant will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the question of whether such indemnification by it is against
public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.</P>

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


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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 July 31, 2020.</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>&nbsp;</TD>
    <TD COLSPAN="2"><B>MARSH &amp; McLENNAN COMPANIES, INC. </B></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; width: 55%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 5%">By:</TD>
    <TD STYLE="vertical-align: top; width: 33%; border-bottom: Black 1pt solid">/s/ Daniel S. Glaser</TD>
    <TD STYLE="vertical-align: top; width: 7%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Daniel S. Glaser</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Title:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Director, President and Chief Executive Officer</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>

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

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt"></P></DIV>
    <!-- Field: /Page -->

<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 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 July 31, 2020.</P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-right: 5pt; width: 37%">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Signature&nbsp;</P></TD>
    <TD STYLE="width: 63%">
        <P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Title&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-right: 5pt">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Daniel S. Glaser&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director, President and Chief Executive Officer <BR>
(Principal Executive Officer)</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Daniel S. Glaser</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Mark C. McGivney&nbsp;</P></TD>
    <TD STYLE="text-align: center">Chief Financial Officer<BR>
(Principal Financial Officer)</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Mark C. McGivney</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Stacy M. Mills&nbsp;</P></TD>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Vice President and Controller</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">(Principal Accounting Officer)&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Stacy M. Mills</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Anthony K. Anderson&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Anthony K. Anderson</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Oscar Fanjul&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Oscar Fanjul</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
H. Edward Hanway&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>H. Edward Hanway</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Deborah C. Hopkins&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Deborah C. Hopkins</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Tamara Ingram&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Tamara Ingram</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Jane H. Lute&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Jane H. Lute</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
</TABLE>

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

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid; width: 37%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt; text-indent: -9.35pt">/s/
Steven A. Mills&nbsp;</P></TD>
    <TD STYLE="text-align: center; width: 63%">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Steven A. Mills </TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">/s/ Bruce P. Nolop</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Bruce P. Nolop</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt">/s/ Marc D. Oken</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt"></P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Marc D. Oken</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt">/s/ Morton O. Schapiro</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt"></P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Morton O. Schapiro</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt">/s/ Lloyd M. Yates</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt"></P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>Lloyd M. Yates</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt">/s/ R. David Yost</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 9.35pt; text-indent: -9.35pt"></P></TD>
    <TD STYLE="text-align: center">Director</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>R. David Yost </TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
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[{"type": "S-8", "sequence": "1", "filename": "dp133194_s8.htm", "description": "FORM S-8", "secsgml_size_bytes": 48533}]
{"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": "333-240223", "film-number": "201063694"}, "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 July 31, 2020
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, INC.
2020 INCENTIVE AND STOCK AWARD 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
20,000,000
$114.05
$2,281,000,000
$296,074
(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 the Company's 2020 Incentive and Stock Award Plan (the "Plan"), and any additional shares
of Common Stock that become issuable under the Plan 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").
(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 July
27, 2020.
(3)
Rounded up to the nearest penny.
PART 1
INFORMATION REQUIRED
IN THE SECTION 10(a) PROSPECTUS
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, 2019, filed with the U.S. Securities and Exchange Commission
(the "Commission") on February 20, 2020 (File No. 001-05998).
(b)  The Company's current reports
on Form 8-K filed after the fiscal year ended December 31, 2019.
(c)  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. The Registrant is not incorporating
by reference any document or portion thereof, whether specifically listed above or to be filed in the future, that is not deemed
"filed" with the Commission.
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 4. Description of Securities
Not applicable.
Item 5. Interests of Named Experts and Counsel
Katherine J. Brennan, Deputy General Counsel,
Corporate Secretary & Chief Compliance Officer of the Company will pass upon the validity of the offered securities. Ms. Brennan
is eligible to participate in the Plan.
Item 6. Indemnification of Directors and Officers.
Section 145 of
the General Corporation Law of the State of Delaware (the "DGCL") provides that a corporation may indemnify directors
and officers, as well as employees and other individuals, against expenses (including attorneys' fees), judgments, fines
and amounts paid in settlement actually and reasonably incurred by such person in connection with any threatened, pending or completed
actions, suits or proceedings in which such
person is made a party by reason of
such person being or having been a director, officer, employee or agent of the corporation. The DGCL provides that Section 145
is not exclusive of other rights to which those seeking indemnification may be entitled under any bylaw, agreement, vote of stockholders
or disinterested directors or otherwise. Section 6.01 of the Company's amended and restated bylaws provides for indemnification
by the Company of its directors, officers and employees to the fullest extent permitted by the DGCL.
Section 102(b)(7)
of the DGCL permits a corporation to provide in its certificate of incorporation that a director of the corporation shall not be
personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except
for liability for any breach of the director's duty of loyalty to the corporation or its stockholders, for acts or omissions
not in good faith or which involve intentional misconduct or a knowing violation of law, for unlawful payments of dividends or
unlawful stock purchases, redemptions or other distributions, or for any transaction from which the director derived an improper
personal benefit. The Company's restated certificate of incorporation provides for such limitation of liability.
The Company maintains
standard policies of insurance under which coverage is provided to its directors and officers against loss arising from claims
made by reason of breach of duty, misstatement, error or omission committed in their capacity as directors or officers of the Company.
Such policies of insurance also provide coverage to the Company with respect to payments which may be made by the Company to such
officers and directors pursuant to the above indemnification provision or otherwise as a matter of law.
Item 7. Exemption from Registration Claimed.
Not applicable.
Item 8. Exhibits.
Exhibit
Number
4.1
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).*
4.2
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).*
5.1
Opinion of Katherine J. Brennan.
23.1
Consent of Independent Registered Public Accounting Firm, Deloitte & Touche LLP.
23.2
Consent of Counsel (included in Exhibit 5.1).
24
Power of Attorney (included on the signature pages of this Registration Statement).
99.1
Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan (incorporated by reference from Exhibit C to the Registrant's Definitive Proxy Statement on Schedule 14A filed on April 3, 2020).*
*Incorporated herein by reference
Item 9. Undertakings
.
(a)   The
undersigned Registrant hereby undertakes:
(1)   To
file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:
(i)     To
include any prospectus required by Section 10(a)(3) of the Securities Act;
(ii)    To
reflect in the prospectus any facts or events arising after the effective date of this Registration Statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set
forth in this Registration Statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if
the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high
end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission
pursuant to Rule 424(b) if, in the
aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set
forth in the "Calculation of Registration Fee" table in this registration statement; and
(iii)   To
include any material information with respect to the Plans not previously disclosed in this Registration Statement or any material
change to such information in this Registration Statement;
provided
,
however
,
that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in periodic reports filed with or furnished to the Commission by the Registrant pursuant to Section
13 or Section 15(d) of the Exchange Act that are incorporated by reference in this Registration Statement.
(2)   That,
for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall
be deemed to be the initial
bona fide
offering thereof.
(3)   To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the
termination of the offering.
(b)   The
undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing
of the Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable,
each filing of an employee benefit plan's annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated
by reference in this Registration Statement shall be deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be the initial
bona fide
offering thereof.
(c)   Insofar
as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the provisions referenced in Item 6 of this Registration Statement, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities
(other than the payment by the Registrant of expenses incurred or paid by a director, officer, or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection
with the securities being registered hereunder, the Registrant will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the question of whether such indemnification by it is against
public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.
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 July 31, 2020.
MARSH & McLENNAN COMPANIES, INC.
By:
/s/ Daniel S. Glaser
Name:      Daniel S. Glaser
Title:        Director, President and Chief Executive Officer
POWER OF ATTORNEY
The undersigned directors and officers of
the Marsh & McLennan Companies, Inc. hereby appoint each of Katherine J. Brennan 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 July 31, 2020.
Signature
Title
/s/
Daniel S. Glaser
Director, President and Chief Executive Officer
(Principal Executive Officer)
Daniel S. Glaser
/s/
Mark C. McGivney
Chief Financial Officer
(Principal Financial Officer)
Mark C. McGivney
/s/
Stacy M. Mills
Vice President and Controller
(Principal Accounting Officer)
Stacy M. Mills
/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/
Tamara Ingram
Director
Tamara Ingram
/s/
Jane H. Lute
Director
Jane H. Lute
/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