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<div><a name="s33BF61795BC050AC9D9699B7FD10B807"></a></div><div style="line-height:120%;text-align:center;-sec-extract:summary;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="1"></td></tr><tr><td style="width:100%;"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:2px solid #000000;"><div style="overflow:hidden;height:5px;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:8px;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">UNITED STATES</font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">SECURITIES AND EXCHANGE COMMISSION</font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">Washington, D.C.&#160;20549</font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">_____________________</font></div><div style="line-height:120%;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">FORM 8-K</font></div><div style="line-height:120%;padding-top:8px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font><font style="font-family:Arial;font-size:10pt;font-weight:bold;">CURRENT REPORT </font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">PURSUANT TO SECTION 13 OR 15(d) </font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">OF THE SECURITIES EXCHANGE ACT OF 1934</font></div><div style="line-height:120%;padding-top:8px;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">For the fiscal year ended December&#160;31, 2017</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">Commission File No.&#160;1-5998</font></div><div style="line-height:120%;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:51%;"></td><td style="width:49%;"></td></tr><tr><td style="vertical-align:top;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Date of report (Date of earliest event reported)</font></div></td><td style="vertical-align:top;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">May 9, 2018</font></div></td></tr></table></div><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div><div style="line-height:120%;text-align:center;"><img src="logommc2015.jpg" alt="logommc2015.jpg" style="height:58px;width:346px;"></div><div style="line-height:120%;text-align:center;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:99.609375%;border-collapse:collapse;text-align:left;"><tr><td colspan="1"></td></tr><tr><td style="width:100%;"></td></tr><tr><td style="vertical-align:top;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Marsh &amp; McLennan Companies, Inc.</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">(Exact Name of Registrant as Specified in Charter)</font></div></td></tr></table></div></div><div style="line-height:120%;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:29%;"></td><td style="width:42%;"></td><td style="width:29%;"></td></tr><tr><td style="vertical-align:top;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Delaware</font></div></td><td style="vertical-align:top;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">1-5998</font></div></td><td style="vertical-align:top;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">36-2668272</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">(State or Other Jurisdiction of Incorporation)</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">(Commission File Number)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">(IRS Employer</font></div><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Identification No.)</font></div></td></tr></table></div></div><div style="line-height:120%;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:51%;"></td><td style="width:49%;"></td></tr><tr><td style="vertical-align:middle;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">1166 Avenue of the Americas, New York, NY</font></div></td><td style="vertical-align:middle;border-bottom:2px solid #000000;padding-left:0px;padding-top:2px;padding-bottom:2px;padding-right:0px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">10036</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">(Address of Principal Executive Offices)</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">(Zip Code)</font></div></td></tr></table></div></div><div style="line-height:120%;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:51%;"></td><td style="width:49%;"></td></tr><tr><td style="vertical-align:middle;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Registrant&#8217;s telephone number, including area code</font></div></td><td style="vertical-align:middle;border-bottom:2px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">(212) 345-5000</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:8px;font-size:11pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font><font style="font-family:Arial;font-size:11pt;">&#160;&#160;&#160;&#160;Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></div><div style="line-height:120%;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:682px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:45px;"></td><td style="width:37px;"></td><td style="width:600px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Wingdings;font-size:11pt;">o</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:682px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:45px;"></td><td style="width:37px;"></td><td style="width:600px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Wingdings;font-size:11pt;">o</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:682px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:45px;"></td><td style="width:37px;"></td><td style="width:600px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Wingdings;font-size:11pt;">o</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:justify;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:682px;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td style="width:45px;"></td><td style="width:37px;"></td><td style="width:600px;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Wingdings;font-size:11pt;">o</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:8px;text-indent:48px;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (&#167;230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (&#167;240.12b-2 of this chapter).</font></div><div style="line-height:120%;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:7%;"></td><td style="width:93%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Emerging growth company      </font><font style="font-family:Wingdings;font-size:11pt;">o</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">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 13(a) of the Exchange Act.       </font><font style="font-family:Wingdings;font-size:11pt;">o</font></div></td></tr></table></div></div><div style="line-height:120%;padding-top:4px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:99.609375%;border-collapse:collapse;text-align:left;"><tr><td colspan="5"></td></tr><tr><td style="width:20%;"></td><td style="width:20%;"></td><td style="width:20%;"></td><td style="width:20%;"></td><td style="width:20%;"></td></tr><tr><td colspan="5" style="vertical-align:bottom;border-bottom:1.5px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:5px;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">1</font></div></div><hr style="page-break-after:always"><div><br></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">Item 8.01&#160;&#160;&#160;&#160;Other Events</font></div><div style="line-height:120%;padding-top:12px;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">As discussed in the Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 filed by Marsh &amp; McLennan Companies, Inc. (the "Company") on April 27, 2018, effective January 1, 2018, the Company adopted an amendment to ASC Topic 715 ("ASC 715") that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. </font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">The guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, the Company is filing this Current Report on Form 8-K to retrospectively reclassify certain previously reported financial information in its Annual Report on Form 10-K for the fiscal year ended December 31, 2017 to reflect this change. Except as specifically provided herein, the Company has not updated this Current Report for any development or event occurring after February 22, 2018, the date on which the Company's 2017 Annual Report on Form 10-K was filed with the SEC.</font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">The adoption of this guidance impacts the line item presentation of the Company's results of operations, but does not change income before taxes, net income or earnings per share.</font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Exhibit 99.1 to this Current Report is incorporated by reference herein and includes updates only to the extent necessary to reflect reclassifications made to the following items of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2017:</font></div><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:11pt;padding-left:36px;"><font style="font-family:Arial;font-size:11pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Item  6. Selected Financial Data</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:11pt;padding-left:36px;"><font style="font-family:Arial;font-size:11pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Item  7. Management&#8217;s Discussion and Analysis of Financial Condition and Results of Operations; and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:4px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:11pt;padding-left:36px;"><font style="font-family:Arial;font-size:11pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Item  8. Financial Statements and Supplementary Data</font></div></td></tr></table><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br></font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">Item 9.01&#160;&#160;&#160;&#160;Financial Statements and Exhibits</font></div><div style="line-height:120%;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">(d)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Exhibits</font></div><div style="line-height:120%;text-align:left;padding-left:0px;text-indent:0px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:92.7734375%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:11%;"></td><td style="width:89%;"></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">23.1</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">Consent of Independent Registered Public Accounting Firm</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">99.1</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">Retrospective revisions to the following portions of Marsh &amp; McLennan Companies, Inc.&#8217;s Annual Report on Form 10-K for the year ended December&#160;31, 2017, as originally filed with the Securities and Exchange Commission on February 22, 2018: Item 6. Selected Financial Data; Item 7. Management&#8217;s Discussion and Analysis of Financial Condition and Results of Operations; and Item 8. Financial Statements and Supplementary Data.</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.INS</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Instance Document</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.SCH</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Schema</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.CAL</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Calculation Linkbase</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.DEF</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Definition Linkbase</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.LAB</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Label Linkbase</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.PRE</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Presentation Linkbase</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">2</font></div></div><hr style="page-break-after:always"><div><br></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">SIGNATURES</font></div><div style="line-height:120%;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</font></div><div style="line-height:120%;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;font-size:11pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="4"></td></tr><tr><td style="width:50%;"></td><td style="width:12%;"></td><td style="width:36%;"></td><td style="width:2%;"></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">MARSH &amp; McLENNAN COMPANIES, INC.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">By:</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">/s/ Katherine J. Brennan&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Name:</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Katherine J. Brennan</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;-sec-extract:summary;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Title:</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Deputy General Counsel, </font></div><div style="font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Chief Compliance Officer &amp;</font></div><div style="font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Corporate Secretary</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div><div style="line-height:120%;-sec-extract:summary;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div><div style="line-height:120%;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;">Date:&#160;&#160;&#160;&#160;&#160; May 9, 2018</font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">3</font></div></div><hr style="page-break-after:always"><div><br></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;font-weight:bold;">EXHIBIT INDEX</font></div><div style="line-height:120%;font-size:11pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:98.828125%;border-collapse:collapse;text-align:left;"><tr><td colspan="2"></td></tr><tr><td style="width:17%;"></td><td style="width:83%;"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;text-decoration:underline;">Exhibit No.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-bottom:12px;text-align:left;font-size:11pt;"><font style="font-family:Arial;font-size:11pt;text-decoration:underline;">Exhibit</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;-sec-extract:exhibit;" href="mmc12312017ex_231restateme.htm"><font style="font-family:Arial;font-size:10pt;">23.1</font></a></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;-sec-extract:exhibit;" href="mmc12312017ex_231restateme.htm"><font style="font-family:Arial;font-size:10pt;">Consent of Independent Registered Public Accounting Firm</font></a></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;-sec-extract:exhibit;" href="ex_991mmc10-krestatement20.htm"><font style="font-family:Arial;font-size:10pt;">99.1</font></a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;-sec-extract:exhibit;" href="ex_991mmc10-krestatement20.htm"><font style="font-family:Arial;font-size:10pt;">Retrospective revisions to the following portions of Marsh &amp; McLennan Companies, Inc.&#8217;s Annual Report on Form 10-K for the year ended December&#160;31, 2017, as originally filed with the Securities and Exchange Commission on February 22, 2018: Item 6. Selected Financial Data; Item 7. Management&#8217;s Discussion and Analysis of Financial Condition and Results of Operations; and Item 8. Financial Statements and Supplementary Data.</font></a></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.INS</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Instance Document</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.SCH</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Schema</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.CAL</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Calculation Linkbase</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.DEF</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Definition Linkbase</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.LAB</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Label Linkbase</font></div></td></tr><tr><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">101.PRE</font></div></td><td style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">XBRL Taxonomy Extension Presentation Linkbase</font></div></td></tr></table></div></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div><br></div><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">4</font></div></div>	</body>
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Document
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
_____________________
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2017
Commission File No. 1-5998
Date of report (Date of earliest event reported)
May 9, 2018
Marsh & McLennan Companies, Inc.
(Exact Name of Registrant as Specified in Charter)
Delaware
1-5998
36-2668272
(State or Other Jurisdiction of Incorporation)
(Commission File Number)
(IRS Employer
Identification No.)
1166 Avenue of the Americas, New York, NY
10036
(Address of Principal Executive Offices)
(Zip Code)
Registrant's telephone number, including area code
(212) 345-5000
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company
o
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 13(a) of the Exchange Act.
o
1
Item 8.01    Other Events
As discussed in the Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 filed by Marsh & McLennan Companies, Inc. (the "Company") on April 27, 2018, effective January 1, 2018, the Company adopted an amendment to ASC Topic 715 ("ASC 715") that changes the presentation of net periodic pension cost and net periodic postretirement cost (''net periodic benefit costs"). The new guidance requires employers to report the service cost component of net periodic benefit costs in the same line item as other compensation costs in the income statement. The other components of net periodic benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations.
The guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. The new guidance requires retrospective application for the presentation of the service cost component and the other components of net periodic benefit costs. Accordingly, the Company is filing this Current Report on Form 8-K to retrospectively reclassify certain previously reported financial information in its Annual Report on Form 10-K for the fiscal year ended December 31, 2017 to reflect this change. Except as specifically provided herein, the Company has not updated this Current Report for any development or event occurring after February 22, 2018, the date on which the Company's 2017 Annual Report on Form 10-K was filed with the SEC.
The adoption of this guidance impacts the line item presentation of the Company's results of operations, but does not change income before taxes, net income or earnings per share.
Exhibit 99.1 to this Current Report is incorporated by reference herein and includes updates only to the extent necessary to reflect reclassifications made to the following items of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2017:
•
Item  6. Selected Financial Data
•
Item  7. Management's Discussion and Analysis of Financial Condition and Results of Operations; and
•
Item  8. Financial Statements and Supplementary Data
Item 9.01    Financial Statements and Exhibits
(d)        Exhibits
23.1
Consent of Independent Registered Public Accounting Firm
99.1
Retrospective revisions to the following portions of Marsh & McLennan Companies, Inc.'s Annual Report on Form 10-K for the year ended December 31, 2017, as originally filed with the Securities and Exchange Commission on February 22, 2018: Item 6. Selected Financial Data; Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations; and Item 8. Financial Statements and Supplementary Data.
101.INS
XBRL Instance Document
101.SCH
XBRL Taxonomy Extension Schema
101.CAL
XBRL Taxonomy Extension Calculation Linkbase
101.DEF
XBRL Taxonomy Extension Definition Linkbase
101.LAB
XBRL Taxonomy Extension Label Linkbase
101.PRE
XBRL Taxonomy Extension Presentation Linkbase
2
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
MARSH & McLENNAN COMPANIES, INC.
By:
/s/ Katherine J. Brennan
Name:
Katherine J. Brennan
Title:
Deputy General Counsel,
Chief Compliance Officer &
Corporate Secretary
Date:      May 9, 2018
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EXHIBIT INDEX
Exhibit No.
Exhibit
23.1
Consent of Independent Registered Public Accounting Firm
99.1
Retrospective revisions to the following portions of Marsh & McLennan Companies, Inc.'s Annual Report on Form 10-K for the year ended December 31, 2017, as originally filed with the Securities and Exchange Commission on February 22, 2018: Item 6. Selected Financial Data; Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations; and Item 8. Financial Statements and Supplementary Data.
101.INS
XBRL Instance Document
101.SCH
XBRL Taxonomy Extension Schema
101.CAL
XBRL Taxonomy Extension Calculation Linkbase
101.DEF
XBRL Taxonomy Extension Definition Linkbase
101.LAB
XBRL Taxonomy Extension Label Linkbase
101.PRE
XBRL Taxonomy Extension Presentation Linkbase
4