MMC / Marsh & McLennan Companies, Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Marsh & McLennan Companies, Inc.
US ˙ NYSE ˙ US5717481023

Mga Batayang Estadistika
LEI 549300XMP3KDCKJXIU47
CIK 62709
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Marsh & McLennan Companies, Inc.
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
July 17, 2025 EX-10.2

Description of Compensation Arrangements for Independent Directors of Marsh & McLennan Companies, Inc. effective June 1, 2025.

Description of Compensation Arrangements for Independent Directors Effective June 1, 2025, which will be the start of the Board’s annual pay cycle, Marsh & McLennan Companies, Inc.

July 17, 2025 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 17, 2025 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

July 17, 2025 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 +1 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 +1 212 345 5000 www.

July 17, 2025 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2025 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to. Marsh & McLennan Companies, Inc. 1166 Avenue of the Ameri

July 9, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 9, 2025 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

July 9, 2025 EX-99.1

1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

June 24, 2025 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2024 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2024 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN COMPANIES 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: M

June 24, 2025 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2024 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2024 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN AGENCY 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: MARS

May 19, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 19, 2025 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

April 17, 2025 EX-10.7

Non-Competition and Non-Solicitation Agreement, effective as of April 1, 2024, between Marsh & McLennan Companies, Inc. and Patrick Tomlinson.

NON-COMPETITION AND NON-SOLICITATION AGREEMENT AGREEMENT, dated as of March 20, 2024, between Marsh & McLennan Companies, Inc.

April 17, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 17, 2025 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commis

April 17, 2025 EX-10.1

Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and John Q. Doyle.

Steven A. Mills Chairman of the Compensation Committee of the Board of Directors Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com February 18, 2025 John Q. Doyle Electronic Delivery Subject: Terms of Employment Dear John, This third amendment to the Letter Agreement, dated November 10, 2022, between you and Marsh & McLennan Companies, Inc. as subsequently

April 17, 2025 EX-10.2

Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Mark C. McGivney.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com February 18, 2025 Mark C. McGivney Electronic Delivery Subject: Terms of Employment Dear Mark, This fifth amendment to the Letter Agreement, dated September 17, 2015, between you and Marsh & McLennan Companies, Inc. as subsequently amended on January 17, 2

April 17, 2025 EX-10.5

Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Patrick Tomlinson.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com February 18, 2025 Patrick Tomlinson Electronic Delivery Subject: Terms of Employment Dear Pat, This amendment to the Letter Agreement, dated March 20, 2024, between you and Marsh & McLennan Companies, Inc. (taken together, the “Letter Agreement”), revises

April 17, 2025 EX-10.4

Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Dean M. Klisura.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com February 18, 2025 Dean Klisura Electronic Delivery Subject: Terms of Employment Dear Dean, This second amendment to the Letter Agreement, dated December 1, 2021, between you and Marsh & McLennan Companies, Inc. as subsequently amended on February 22, 2024

April 17, 2025 EX-10.10

Form of Restricted Stock Unit Award, dated as of February 18, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF RESTRICTED STOCK UNIT AWARDS GRANTED ON [DATE], 2025 TABLE OF CONTENTS Page I. BACKGROUND..............................................................................1 II. AWARDS......................................................................................1 III. EMPLOYMENT EVENTS..................

April 17, 2025 EX-10.9

Form of Performance Stock Unit Award, dated as of February 18, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF PERFORMANCE STOCK UNIT AWARDS GRANTED ON [DATE], 2025 TABLE OF CONTENTS Page I. BACKGROUND....................................................................................1 II. AWARDS............................................................................................1 III. EMPLOYMENT EVENTS.....

April 17, 2025 EX-10.6

Letter Agreement, effective as of April 1, 2024, between Marsh & McLennan Companies, Inc. and Patrick Tomlinson.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com March 20, 2024 Patrick Tomlinson Hand Delivery Subject: Terms of Employment Dear Pat, This letter agreement sets forth the terms of your continued employment by Mercer Consulting Group, Inc. (“Mercer”) as its President and Chief Executive Officer. This pos

April 17, 2025 EX-10.3

Letter Agreement Amendment, dated February 18, 2025, between Marsh & McLennan Companies, Inc. and Martin South.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com February 18, 2025 Martin South Electronic Delivery Subject: Terms of Employment Dear Martin, This second amendment to the Letter Agreement, dated December 1, 2021, between you and Marsh & McLennan Companies, Inc. as subsequently amended on February 22, 202

April 17, 2025 EX-10.8

Form of Stock Option Award, dated as of February 18, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF STOCK OPTION AWARDS GRANTED ON [DATE], 2025 TABLE OF CONTENTS Page I. BACKGROUND...................................................................................................1 II. AWARDS.............................................................................................................1 III.

April 17, 2025 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2025 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to. Marsh & McLennan Companies, Inc. 1166 Avenue of the Amer

April 17, 2025 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

April 9, 2025 PX14A6G

Notice of Exempt Solicitation Pursuant to Rule 14a-103

Notice of Exempt Solicitation Pursuant to Rule 14a-103 Name of Registrant: Marsh & McLennan Companies, Inc.

March 28, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Pro

March 28, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defi

February 10, 2025 EX-10.34

*First Amendment to the January 1, 2022 Amended and Restated Marsh & McLennan Companies Supplemental Savings & Investment Plan effective August 1, 2024

FIRST AMENDMENT TO THE JANUARY 1, 2022 AMENDED AND RESTATED MARSH & MCLENNAN COMPANIES SUPPLEMENTAL SAVINGS & INVESTMENT PLAN WHEREAS, Marsh & McLennan Companies, Inc.

February 10, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2024 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Commission File No. 1-5998 Marsh & McLennan Companies, Inc. (Exact name of registr

February 10, 2025 EX-21.1

List of Subsidiaries of Marsh & McLennan Companies, Inc.

Exhibit 21 - MMC Subsidiary List Marsh & McLennan Companies, Inc. as of February 10, 2025 Company Name Country 1 A. Constantinidi & CIA. S.C. Uruguay 2 Acumen Solutions Group LLC United States 3 Advance Asset Management Limited Australia 4 Aermetric Technology Group, Inc United States 5 AFCO Premium Credit LLC United States 6 Agnew Higgins Pickering & Co. (Bermuda) Ltd Bermuda 7 Alpha Consultants

February 10, 2025 EX-4.23

, between Marsh & McLennan Companies, Inc. and the Bank of New York Mellon, as trustee

MARSH & McLENNAN COMPANIES, INC., Issuer, and The Bank of New York Mellon, Trustee TWENTIETH SUPPLEMENTAL INDENTURE Dated as of December 13, 2024 TWENTIETH SUPPLEMENTAL INDENTURE, dated as of December 13, 2024, between MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”), and THE BANK OF NEW YORK MELLON, a New York banking corporation, as Trustee (the “Trustee”). W I T N E S S E

February 10, 2025 EX-97.1

Marsh & McLennan Companies, Inc. Compensation Clawback Policy

Marsh & McLennan Companies, Inc. Compensation Clawback Policy 1.Purpose It is the purpose of this Compensation Clawback Policy (the “Policy”) to set forth the guidelines for the recoupment of certain incentive-based compensation in the event of an accounting restatement resulting from noncompliance with financial reporting requirements under U.S. federal securities laws. This Policy is intended to

February 10, 2025 EX-19.1

Trading Securities Policy

Compliance Policy Live The Greater Good TRADING SECURITIES This Policy applies to all colleagues.

February 10, 2025 EX-19.2

Insider Trading Policy

TRANSACTIONS IN MARSH MCLENNAN SECURITIES BY DIRECTORS AND EXECUTIVE OFFICERS TRANSACTIONS IN MARSH MCLENNAN SECURITIES BY DIRECTORS AND EXECUTIVE OFFICERS POLICY OVERVIEW PURPOSE This Policy is designed to help •prevent the potentially severe personal legal consequences to directors and executive officers of insider trading violations and •meet personal regulatory reporting obligations in the U.

January 30, 2025 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 30, 2025 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

January 30, 2025 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

November 15, 2024 EX-99.1

Marsh McLennan

Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.

November 15, 2024 8-K

Termination of a Material Definitive Agreement, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 15, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (C

November 8, 2024 EX-4.1

Nineteenth Supplemental Indenture, dated November 8, 2024, between Marsh & McLennan Companies, Inc. and The Bank of New York Mellon, as trustee.

EXHIBIT 4.1 MARSH & McLENNAN COMPANIES, INC., Issuer, and The Bank of New York Mellon, Trustee NINETEENTH SUPPLEMENTAL INDENTURE Dated as of November 8, 2024 $950,000,000 aggregate principal amount of 4.550% Senior Notes due 2027 $1,000,000,000 aggregate principal amount of 4.650% Senior Notes due 2030 $1,000,000,000 aggregate principal amount of 4.850% Senior Notes due 2031 $2,000,000,000 aggrega

November 8, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 8, 2024 Marsh & McLennan

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 8, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Com

November 8, 2024 EX-4.9

Calculation Agency Agreement, dated November 8, 2024, between Marsh & McLennan Companies, Inc. and The Bank of New York Mellon, as calculation agent.

EXHIBIT 4.9 CALCULATION AGENCY AGREEMENT BETWEEN MARSH & MCLENNAN COMPANIES, INC. AND THE BANK OF NEW YORK MELLON THIS AGREEMENT is made as of November 8, 2024, between MARSH & MCLENNAN COMPANIES, INC., a Delaware corporation, whose principal executive office is at 1166 Avenue of the Americas, New York, New York 10036 (the “Corporation”), and THE BANK OF NEW YORK MELLON, a New York banking corpora

November 8, 2024 EX-1.1

Underwriting Agreement, dated October 30, 2024, by and among Marsh & McLennan Companies, Inc. and Citigroup Global Markets Inc., BofA Securities, Inc., Deutsche Bank Securities Inc., HSBC Securities (USA) Inc., J.P. Morgan Securities LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein.

EXHIBIT 1.1 Marsh & McLennan Companies, Inc. $950,000,000 aggregate principal amount of 4.550% Senior Notes due 2027 $1,000,000,000 aggregate principal amount of 4.650% Senior Notes due 2030 $1,000,000,000 aggregate principal amount of 4.850% Senior Notes due 2031 $2,000,000,000 aggregate principal amount of 5.000% Senior Notes due 2035 $500,000,000 aggregate principal amount of 5.350% Senior Note

November 1, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Marsh & McLennan Companies, Inc.

November 1, 2024 424B2

(continued on the next page)

Table of Contents (continued on the next page) Filed Pursuant to Rule 424(b)(2) Registration Statement No.

October 31, 2024 FWP

Marsh & McLennan Companies, Inc. $950,000,000 4.550% Senior Notes due 2027 $1,000,000,000 4.650% Senior Notes due 2030 $1,000,000,000 4.850% Senior Notes due 2031 $2,000,000,000 5.000% Senior Notes due 2035 $500,000,000 5.350% Senior Notes due 2044 $

Issuer Free Writing Prospectus Filed Pursuant to Rule 433 Supplementing the Preliminary Prospectus Supplement, dated October 30, 2024 Registration Statement No.

October 30, 2024 424B2

PRELIMINARY PROSPECTUS SUPPLEMENT SUBJECT TO COMPLETION, DATED OCTOBER 30, 2024

Table of Contents The information in this preliminary prospectus supplement is not complete and may be changed.

October 17, 2024 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 17, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

October 17, 2024 EX-10.1

Commitment Letter by and among Marsh & McLennan Companies, Inc. and Citigroup Global Markets Inc., dated as of September 29, 2024.

Execution Version CITIGROUP GLOBAL MARKETS INC. 388 Greenwich Street New York, New York 10013 September 29, 2024 Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, New York 10036 Attention: Mark McGivney, Chief Financial Officer Project Bulldog Commitment Letter Ladies and Gentlemen: Marsh & McLennan Companies, Inc., a Delaware corporation (the “Borrower” or “you”), has advised

October 17, 2024 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

October 17, 2024 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2024 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to. Marsh & McLennan Companies, Inc. 1166 Avenue of the

September 30, 2024 EX-99.1

Marsh McLennan

Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.

September 30, 2024 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 29, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (

September 30, 2024 EX-2.1

Agency, LLC, BD Merger Sub, Inc. and TIH Platform Midco, L.P., dated as of

bulldog-mergeragreementx AGREEMENT AND PLAN OF MERGER by and among TIH BLOCKER II, INC.

July 24, 2024 S-3ASR

As filed with the Securities and Exchange Commission on July 24, 2024

As filed with the Securities and Exchange Commission on July 24, 2024 Registration No.

July 24, 2024 EX-25.2

Statement of Eligibility on Form T-1 under the Trust Indenture Act of 1939, as amended, of The Bank of New York Mellon, as trustee for the form of subordinated indenture.

Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdiction

July 24, 2024 EX-25.1

Statement of Eligibility on Form T-1 under the Trust Indenture Act of 1939, as amended, of The Bank of New York Mellon, as trustee for the Indenture dated as of July 15, 2011.

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdiction

July 24, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Marsh & McLennan Companies, Inc.

July 18, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 18, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

July 18, 2024 EX-10.1

Letter Agreement Amendment, dated July 10, 2024, between Marsh & McLennan Companies, Inc. and John Q. Doyle

Steven A. Mills Chairman of the Compensation Committee of the Board of Directors Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com July 10, 2024 John Q. Doyle Hand Delivery Subject: Terms of Employment Dear John, This second amendment to the Letter Agreement, dated November 10, 2022, between you and Marsh & McLennan Companies, Inc. as subsequently amended

July 18, 2024 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2024 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to. Marsh & McLennan Companies, Inc. 1166 Avenue of the Ameri

July 18, 2024 EX-99.1

MARSH McLENNAN REPORTS SECOND QUARTER 2024 RESULTS GAAP Revenue Increases 6%; Underlying Revenue Rises 6% Growth in GAAP Operating Income of 13% and Adjusted Operating Income of 11% Second Quarter GAAP EPS Rises 10% to $2.27 and Adjusted EPS Increase

Exhibit 99.1 NEWS RELEASE Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com MARSH McLENNAN REPORTS SECOND QUARTER 2024 RESULTS GAAP Revenue Increases 6%; Underlying Revenue Rises 6% Growth in GAAP Operating Income of 13% and Adjusted Operating Income of 11% Second Quarter GAAP EPS Rises 10% to $2.27 and Adjusted EPS Increases 10% to $2.41 S

July 10, 2024 EX-99.1

1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

July 10, 2024 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 10, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

June 24, 2024 8-K

Temporary Suspension of Trading Under Registrant's Employee Benefit Plans, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 24, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

June 24, 2024 EX-99.1

1166 Avenue of the Americas

1166 Avenue of the Americas New York, NY 10036 Special Blackout Notice To: Directors & Section 16 officers of Marsh & McLennan Companies, Inc.

June 14, 2024 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2023 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2023 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN COMPANIES 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: M

June 14, 2024 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2023 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2023 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN AGENCY 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: MARS

May 17, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 16, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

April 29, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒    Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy St

April 18, 2024 EX-10.9

Form of Restricted Stock Unit Award, dated as of February 22, 2024, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF RESTRICTED STOCK UNIT AWARDS GRANTED ON [DATE], 2024 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 11 V. DEFINITIONS 12 VI. ADDITIONAL PROVISIONS 13 VII. QUESTIONS AND ADDITIONAL INFORMATION 16 I. BACKGROUND An award (“Award”) has been granted

April 18, 2024 EX-10.10

Form of Performance Stock Unit Award, dated as of February 22, 2024, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF PERFORMANCE STOCK UNIT AWARDS GRANTED ON [DATE], 2024 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 11 V. DEFINITIONS 13 VI. ADDITIONAL PROVISIONS 14 VII. QUESTIONS AND ADDITIONAL INFORMATION 17 I. BACKGROUND A Performance Stock Unit award (“A

April 18, 2024 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2024 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to. Marsh & McLennan Companies, Inc. 1166 Avenue of the Amer

April 18, 2024 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

April 18, 2024 EX-10.4

Letter Agreement Amendment, dated February 22, 2024, between Marsh & McLennan Companies, Inc. and Dean M. Klisura.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com February 22, 2024 Dean Klisura Hand Delivery Subject: Terms of Employment Dear Dean, This first amendment to the Letter Agreement, dated December 1, 2021, between you and Marsh & McLennan Companies, Inc. (the “Letter Agreement”), revises the terms and cond

April 18, 2024 EX-10.3

Letter Agreement Amendment, dated February 22, 2024, between Marsh & McLennan Companies, Inc. and Martin South.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com February 22, 2024 Martin South Hand Delivery Subject: Terms of Employment Dear Martin, This first amendment to the Letter Agreement, dated December 1, 2021, between you and Marsh & McLennan Companies, Inc. (the “Letter Agreement”), revises the terms and co

April 18, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 18, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commis

April 18, 2024 EX-10.6

Non-Competition and Non-Solicitation Agreement, dated as of December 1, 2021, between Marsh & McLennan Companies, Inc. and Dean M. Klisura.

NON-COMPETITION AND NON-SOLICITATION AGREEMENT AGREEMENT, dated as of December 1, 2021, between Marsh & McLennan Companies, Inc.

April 18, 2024 EX-10.11

Form of Stock Option Award, dated as of February 22, 2024, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF STOCK OPTION AWARDS GRANTED ON [DATE], 2024 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 8 V. DEFINITIONS 9 VI. ADDITIONAL PROVISIONS 10 VII. QUESTIONS AND ADDITIONAL INFORMATION 13 I. BACKGROUND A Stock Option award (“Award”) has been grante

April 18, 2024 EX-10.5

Letter Agreement, effective as of January 1, 2022, between Marsh & McLennan Companies, Inc. and Dean M. Klisura.

John Q. Doyle Group President and Chief Operating Officer (effective January 1, 2022) and Vice Chair Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com December 1, 2021 Dean Klisura Hand Delivery Subject: Terms of Employment Dear Dean, This letter agreement sets forth the terms of your continued employment by Guy Carpenter & Company LLC (“Guy Carpenter”) as

April 18, 2024 EX-10.8

Form of Deferred Stock Unit Award, with grant dates from March 1, 2024 through February 1, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Ratable Vesting.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2024 THROUGH FEBRUARY 1, 2025 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 7 V. DEFINITIONS 8 VI. ADDITIONAL PROVISIONS 9 VII. QUESTIONS AND ADDITIONAL INFORMATION 11 I. BACKGROUND An

April 18, 2024 EX-10.7

Form of Deferred Stock Unit Award, with grant dates from March 1, 2024 through February 1, 2025, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Cliff Vesting.

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2024 THROUGH FEBRUARY 1, 2025 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 7 V. DEFINITIONS 8 VI. ADDITIONAL PROVISIONS 9 VII. QUESTIONS AND ADDITIONAL INFORMATION 11 I. BACKGROUND An

March 29, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒    Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy St

March 29, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒    Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ D

March 29, 2024 DEF 14A

DEFINITIVE PROXY STATEMENT COURTESY PDF

2024 Notice of Annual Meeting and Proxy StatementWe partner with clients, colleagues, investors and communities to build the confidence to thrive through the power of perspective.

March 14, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 8, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

February 23, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 22, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Com

February 23, 2024 EX-10.1

10.1 Letter Agreement Amendment, dated February 22, 2024, between Marsh & McLennan Companies, Inc. and John Q. Doyle.

Steven A. Mills Chairman of the Compensation Committee of the Board of Directors Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.mmc.com February 22, 2024 John Q. Doyle Hand delivery Subject: Terms of Employment Dear John, This first amendment to the Letter Agreement, dated November 10, 2022, between you and Marsh & McLennan Companies, Inc. (the “Letter Ag

February 23, 2024 EX-10.2

10.2 Letter Agreement Amendment, dated February 22, 2024, between Marsh & McLennan Companies, Inc. and Mark C. McGivney.

John Q. Doyle President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.mmc.com February 22, 2024 Mark C. McGivney Hand delivery Subject: Terms of Employment Dear Mark, This fourth amendment to the Letter Agreement, dated September 17, 2015, between you and Marsh & McLennan Companies, Inc. as subsequently amended on January 17,

February 20, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 14, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Co

February 20, 2024 EX-1.1

Underwriting Agreement, dated February 14, 2024, by and among Marsh & McLennan Companies, Inc. and J.P. Morgan Securities LLC, Wells Fargo Securities, LLC, Goldman Sachs & Co. LLC, RBC Capital Markets, LLC, Morgan Stanley & Co. LLC and TD Securities (USA) LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 Marsh & McLennan Companies, Inc. $500,000,000 aggregate principal amount of 5.150% Senior Notes due 2034 $500,000,000 aggregate principal amount of 5.450% Senior Notes due 2054 UNDERWRITING AGREEMENT February 14, 2024 February 14, 2024 J.P. Morgan Securities LLC Wells Fargo Securities, LLC Goldman Sachs & Co. LLC RBC Capital Markets, LLC Morgan Stanley & Co. LLC TD Securities (USA) LLC

February 20, 2024 EX-4.1

Eighteenth Supplemental Indenture, dated February 20, 2024, between Marsh & McLennan Companies, Inc. and The Bank of New York Mellon, as trustee.

Exhibit 4.1 MARSH & McLENNAN COMPANIES, INC., Issuer, and  The Bank of New York Mellon, Trustee EIGHTEENTH SUPPLEMENTAL INDENTURE Dated as of February 20, 2024 $500,000,000 aggregate principal amount of 5.150% Senior Notes due 2034 $500,000,000 aggregate principal amount of 5.450% Senior Notes due 2054 EIGHTEENTH SUPPLEMENTAL INDENTURE, dated as of February 20, 2024, between MARSH & McLENNAN COMPA

February 20, 2024 EX-99.1

- 2 -

Exhibit 99.1 Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 News release Media contact: Erick Gustafson Marsh McLennan +1 202 263 7788 [email protected] Investor contact: Sarah DeWitt Marsh McLennan +1 212 345 6750 [email protected] Marsh McLennan Announces Pricing of $1,000,000,000 Senior Notes Offering NEW YORK, February 14, 2024 — Marsh McLenn

February 15, 2024 424B2

$1,000,000,000 Marsh & McLennan Companies, Inc. $500,000,000 5.150% Senior Notes due 2034 $500,000,000 5.450% Senior Notes due 2054

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-258194 Prospectus Supplement February 14, 2024 (To Prospectus Dated July 27, 2021) $1,000,000,000 Marsh & McLennan Companies, Inc. $500,000,000 5.150% Senior Notes due 2034 $500,000,000 5.450% Senior Notes due 2054 We will pay interest on the 5.150% Senior Notes due 2034 (the “2034 Notes”) on March 15 and September 1

February 15, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Fo

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Marsh & McLennan Companies, Inc.

February 14, 2024 424B2

PRELIMINARY PROSPECTUS SUPPLEMENT SUBJECT TO COMPLETION, DATED FEBRUARY 14, 2024

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-258194 The information in this preliminary prospectus supplement is not complete and may be changed. The preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is

February 14, 2024 FWP

Marsh & McLennan Companies, Inc. $500,000,000 5.150% Senior Notes due 2034 $500,000,000 5.450% Senior Notes due 2054 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: February 14, 2024

Final Term Sheet Filed Pursuant to Rule 433 Registration Statement No. 333-258194 February 14, 2024 Marsh & McLennan Companies, Inc. $500,000,000 5.150% Senior Notes due 2034 $500,000,000 5.450% Senior Notes due 2054 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: February 14, 2024 Settlement Date*: February 20, 2024 (T+3) Expected

February 13, 2024 SC 13G/A

MMC / Marsh & McLennan Companies, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: Marsh & McLennan Cos Inc Title of Class of Securities: Common Stock CUSIP Number: 571748102 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is fil

February 12, 2024 EX-97.1

Marsh & McLennan Companies, Inc. Compensation Clawback Policy dated as of December 1, 2023.

Marsh & McLennan Companies, Inc. Compensation Clawback Policy 1.Purpose It is the purpose of this Compensation Clawback Policy (the “Policy”) to set forth the guidelines for the recoupment of certain incentive-based compensation in the event of an accounting restatement resulting from noncompliance with financial reporting requirements under U.S. federal securities laws. This Policy is intended to

February 12, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2023 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Commission File No. 1-5998 Marsh & McLennan Companies, Inc. (Exact name of registr

February 12, 2024 EX-21.1

List of Subsidiaries of Marsh & McLennan Companies, Inc.

Exhibit 21.1 - MMC Subsidiary List Marsh & McLennan Companies, Inc. as at February 12, 2024 Company Name Country 1 A. Constantinidi & CIA. S.C. Uruguay 2 Advance Asset Management Limited Australia 3 AFCO Premium Credit LLC United States 4 Agnew Higgins Pickering & Co. (Bermuda) Ltd Bermuda 5 Aldgate Trustees Ltd United Kingdom 6 Alpha Consultants Limited New Zealand 7 Altius Associates GP Ltd Guer

February 9, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 5, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

February 8, 2024 SC 13G/A

MARSH & MCLENNAN COMPANIES, INC. - AMENDMENT NO. 9 TO SCHEDULE 13G

SC 13G/A 1 audax13ga4q2022.htm AMENDMENT NO. 9 TO SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 9) Audax Credit BDC Inc. (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class of Securities) 05070P 108 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing

January 25, 2024 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

January 25, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 25, 2024 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

October 19, 2023 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2023 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the A

October 19, 2023 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

October 19, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 19, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

October 19, 2023 EX-10.1

Amended and Restated 5 Year Credit Agreement,

Exhibit 10.1 US$3,500,000,000 AMENDED AND RESTATED 5 YEAR CREDIT AGREEMENT dated as of October 11, 2023 Among Marsh & McLennan Companies, Inc. Calm Treasury Holdings Limited and the Designated Subsidiaries referred to herein as Borrowers, The Lenders Listed Herein and Citibank, N.A. as Administrative Agent Bank of America, N.A., Deutsche Bank Securities Inc. HSBC Bank USA, National Association JPM

October 12, 2023 EX-99.1

Media Contact: Erick Gustafson Marsh McLennan +1 202 263 7788 [email protected] Investor Contact: Sarah DeWitt Marsh McLennan +1 212 345 6750 [email protected]

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

October 12, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 9, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commi

September 11, 2023 EX-4.1

, between Marsh & McLennan Companies, Inc. and the Bank of New York Mellon, as trustee (incorporated by reference to the Company's Current Report on Form 8-K dated

Exhibit 4.1 MARSH & McLENNAN COMPANIES, INC., Issuer, and The Bank of New York Mellon, Trustee SEVENTEENTH SUPPLEMENTAL INDENTURE Dated as of September 11, 2023 $600,000,000 aggregate principal amount of 5.400% Senior Notes due 2033 $1,000,000,000 aggregate principal amount of 5.700% Senior Notes due 2053 SEVENTEENTH SUPPLEMENTAL INDENTURE, dated as of September 11, 2023, between MARSH & McLENNAN

September 11, 2023 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 6, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Com

September 11, 2023 EX-99.1

- 2 -

Exhibit 99.1 Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 News release Media contact: Erick Gustafson Marsh McLennan +1 202 263 7788 [email protected] Investor contact: Sarah DeWitt Marsh McLennan +1 212 345 6750 [email protected] Marsh McLennan Announces Pricing of $1.6 Billion Senior Notes Offering NEW YORK, September 6, 2023 — Marsh McLennan

September 11, 2023 EX-1.1

Underwriting Agreement, dated September 6, 2023, by and among Marsh & McLennan Companies, Inc. and BofA Securities, Inc., Citigroup Global Markets Inc, J.P. Morgan Securities and Deutsche Bank Securities, as representatives of the several underwriters named therein.

Exhibit 1.1 Marsh & McLennan Companies, Inc. $600,000,000 aggregate principal amount of 5.400% Senior Notes due 2033 $1,000,000,000 aggregate principal amount of 5.700% Senior Notes due 2053 UNDERWRITING AGREEMENT September 6, 2023 September 6, 2023 BofA Securities, Inc. Citigroup Global Markets Inc. J.P. Morgan Securities LLC Deutsche Bank Securities Inc. For themselves and as Representatives of

September 7, 2023 424B2

Marsh & McLennan Companies, Inc. $600,000,000 5.400% Senior Notes due 2033 $1,000,000,000 5.700% Senior Notes due 2053

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-258194 Prospectus Supplement September 6, 2023 (To Prospectus Dated July 27, 2021) Marsh & McLennan Companies, Inc. $600,000,000 5.400% Senior Notes due 2033 $1,000,000,000 5.700% Senior Notes due 2053 We will pay interest on the 5.400% Senior Notes due 2033 (the “2033 Notes”) on March 15 and September 15 of each yea

September 7, 2023 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Marsh & McLennan Companies, Inc.

September 6, 2023 424B2

PRELIMINARY PROSPECTUS SUPPLEMENT SUBJECT TO COMPLETION, DATED SEPTEMBER 6, 2023

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-258194 The information in this preliminary prospectus supplement is not complete and may be changed. The preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is

September 6, 2023 FWP

Marsh & McLennan Companies, Inc. $600,000,000 5.400% Senior Notes due 2033 $1,000,000,000 5.700% Senior Notes due 2053 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: September 6, 202

Final Term Sheet Filed Pursuant to Rule 433 Registration Statement No. 333-258194 September 6, 2023 Marsh & McLennan Companies, Inc. $600,000,000 5.400% Senior Notes due 2033 $1,000,000,000 5.700% Senior Notes due 2053 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: September 6, 2023 Settlement Date*: September 11, 2023 (T+3) Expec

July 20, 2023 EX-10.1

*Description of compensation arrangements for independent directors of Marsh & McLennan Companies, Inc. effective June 1, 202

Description of Compensation Arrangements for Independent Directors Effective June 1, 2023, which will be the start of the Board’s annual pay cycle, Marsh & McLennan Companies, Inc.

July 20, 2023 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

July 20, 2023 EX-10.2

Amendment No. 1, dated as of May 22, 2023, to the Amended and Restated 5 Year Credit Agreement among Marsh & McLennan Companies, Inc., the designated subsidiaries party thereto as borrowers, Citibank, N.A., as administrative agent, and the lenders from time to time party thereto

marshmclennanamendmentno EXECUTION COPY AMENDMENT NO. 1 TO THE CREDIT AGREEMENT Dated as of May 22, 2023 AMENDMENT NO. 1 TO THE CREDIT AGREEMENT (this “Amendment”) among MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Company”), the Lenders (as defined below) and CITIBANK, N.A., a national banking association, as administrative agent (the “Agent”) for the Lenders. PRELIMINARY STATEM

July 20, 2023 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2023 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the Americ

July 20, 2023 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 20, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

July 12, 2023 CORRESP

December 31, 2022 As reported

Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, NY 10036 T+ 212 345 5000 www.mmc.com Stacy Mills Chief Accounting Officer Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, New York 10036 Mr. John Spitz and Mr. Michael Volley Division of Corporation Finance, Office of Finance U.S. Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 2054

June 16, 2023 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2022 SEC NO. 1-5998

11-K 1 mmcsip11k12312022.htm MMC SIP 11-K 12.31.2022 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2022 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN COMPANIES 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan

June 16, 2023 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2022 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2022 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN AGENCY 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: MARS

June 12, 2023 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) June 12, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

June 12, 2023 EX-99.1

Hafize Gaye Erkan Resigns from Marsh McLennan Board of Directors Departure Follows Ms. Erkan’s Appointment as Governor of Türkiye’s Central Bank

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

May 22, 2023 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 18, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

April 20, 2023 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2023 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the Ameri

April 20, 2023 EX-10.6

Form of Performance Stock Unit Award, dated as of February 23, 2023, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF PERFORMANCE STOCK UNIT AWARDS GRANTED ON [DATE], 2023 TABLE OF CONTENTS Page I. BACKGROUND...................................................................................... 1 II. AWARDS............................................................................................. 1 III. EMPLOYMENT EVENTS

April 20, 2023 EX-10.4

Form of Deferred Stock Unit Award, with grant dates from March 1, 2023 through February 1, 2024, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Ratable Vesting

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2023 THROUGH FEBRUARY 1, 2024 TABLE OF CONTENTS Page I. BACKGROUND...................................................................................... 1 II. AWARDS....................................................................................

April 20, 2023 EX-10.7

Form of Stock Option Award, dated as of February 23, 2023, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF STOCK OPTION AWARDS GRANTED ON [DATE], 2023 TABLE OF CONTENTS Page I. BACKGROUND.................................................................................... 1 II. AWARDS........................................................................................... 1 III. EMPLOYMENT EVENTS..............

April 20, 2023 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

April 20, 2023 EX-10.5

Form of Restricted Stock Unit Award, dated as of February 23, 2023, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF RESTRICTED STOCK UNIT AWARDS GRANTED ON [DATE], 2023 TABLE OF CONTENTS Page I. BACKGROUND............................................................................... 1 II. AWARDS...................................................................................... 1 III. EMPLOYMENT EVENTS...............

April 20, 2023 EX-10.1

(incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 20

John Q. Doyle Group President and Chief Operating Officer (effective January 1, 2022) and Vice Chair Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com December 1, 2021 Martin South Hand Delivery Subject: Terms of Employment Dear Martin, This letter agreement sets forth the terms of your continued employment by Marsh (“Marsh”) as its President and Chief Exe

April 20, 2023 EX-10.3

Form of Deferred Stock Unit Award, with grant dates from March 1, 2023 through February 1, 2024, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Cliff Vesting

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2023 THROUGH FEBRUARY 1, 2024 TABLE OF CONTENTS Page I. BACKGROUND............................................................................... 1 II. AWARDS...................................................................................... 1 II

April 20, 2023 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 20, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commis

April 20, 2023 EX-10.2

(incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 20

NON-COMPETITION AND NON-SOLICITATION AGREEMENT AGREEMENT, dated as of December 1, 2021, between Marsh & McLennan Companies, Inc.

March 31, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registran

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

March 31, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the C o mmission Only (as permitted by Rule 14a-6(e)(2)) ☒ De

March 31, 2023 DEF 14A

DEFINITIVE PROXY STATEMENT COURTESY PDF

Marsh & McLennan Companies, Inc. Notice of Annual Meeting and 2023 Proxy Statement 00 2023 Notice of Annual Meeting and Proxy Statement00 Marsh & McLennan Companies, Inc. Notice of Annual Meeting and 2023 Proxy Statement Risk & Insurance Services Marsh Insurance Broking & Risk Management Guy Carpenter Reinsurance & Capital Strategies Consulting Mercer Health, Wealth & Career Consulting Oliver Wyma

March 29, 2023 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 29, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commis

March 29, 2023 EX-99.1

Marsh McLennan

Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.

March 29, 2023 CORRESP

* * * * *

Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, NY 10036 T+ 212 345 5000 www.mmc.com Stacy Mills Chief Accounting Officer Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, New York 10036 Mr. John Spitz and Mr. Michael Volley Division of Corporation Finance, Office of Finance U.S. Securities and Exchange Commission 100 F Street, N.E. Washington, D.C. 2054

March 9, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 6, 2023 Marsh & McLennan Com

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) March 6, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

March 9, 2023 EX-99.1

Marsh McLennan Announces Pricing of $600 Million Senior Notes Offering

EX-99.1 Exhibit 99.1 Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 News release Media contact: Erick Gustafson Marsh McLennan +1 202 263 7788 [email protected] Investor contact: Sarah DeWitt Marsh McLennan +1 212 345 6750 [email protected] Marsh McLennan Announces Pricing of $600 Million Senior Notes Offering NEW YORK, March 6, 2023 — Marsh McLe

March 9, 2023 EX-4.1

, 2023, between Marsh & McLennan Companies, Inc. and the Bank of New York Mellon, as trustee (incorporated by reference to the Company's Current Report on Form 8-K dated March 9, 2023)

EX-4.1 Exhibit 4.1 MARSH & McLENNAN COMPANIES, INC., Issuer, and The Bank of New York Mellon, Trustee SIXTEENTH SUPPLEMENTAL INDENTURE Dated as of March 9, 2023 $600,000,000 aggregate principal amount of 5.450% Senior Notes due 2053 SIXTEENTH SUPPLEMENTAL INDENTURE, dated as of March 9, 2023, between MARSH & McLENNAN COMPANIES, INC., a Delaware corporation (the “Issuer”), and THE BANK OF NEW YORK

March 9, 2023 EX-1.1

Underwriting Agreement, dated March 6, 2023, by and among Marsh & McLennan Companies, Inc. and Barclays Capital Inc., HSBC Securities (USA) Inc. and Morgan Stanley & Co. LLC, as representatives of the several underwriters named therein.

EX-1.1 Exhibit 1.1 Marsh & McLennan Companies, Inc. $600,000,000 aggregate principal amount of 5.450% Senior Notes due 2053 UNDERWRITING AGREEMENT March 6, 2023 March 6, 2023 Barclays Capital Inc. HSBC Securities (USA) Inc. Morgan Stanley & Co. LLC For themselves and as Representatives of the other Underwriters named in Schedule I hereto Barclays Capital Inc. 745 Seventh Avenue New York, New York

March 8, 2023 EX-FILING FEES

You’ve Exceeded the SEC’s Traffic Limit

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Marsh & McLennan Companies, Inc.

March 8, 2023 424B2

Marsh & McLennan Companies, Inc. $600,000,000 5.450% Senior Notes due 2053

424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No.

March 6, 2023 424B2

PRELIMINARY PROSPECTUS SUPPLEMENT SUBJECT TO COMPLETION, DATED MARCH 6, 2023

424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No.

March 6, 2023 FWP

Marsh & McLennan Companies, Inc. $600,000,000 5.450% Senior Notes due 2053 Issuer: Marsh & McLennan Companies, Inc. Securities: 5.450% Senior Notes due 2053 Offering Format: SEC-Registered Trade Date: March 6, 2023 Settlement Date*: March 9, 2023 (T+

FWP Final Term Sheet Filed Pursuant to Rule 433 Registration Statement No. 333-258194 March 6, 2023 Marsh & McLennan Companies, Inc. $600,000,000 5.450% Senior Notes due 2053 Issuer: Marsh & McLennan Companies, Inc. Securities: 5.450% Senior Notes due 2053 Offering Format: SEC-Registered Trade Date: March 6, 2023 Settlement Date*: March 9, 2023 (T+3) Expected Ratings / Outlook (Moody’s / S&P / Fit

February 13, 2023 EX-21.1

List of Subsidiaries of Marsh & McLennan Companies, Inc.

Exhibit 21.1 Marsh & McLennan Companies, Inc. List of Subsidiaries as of February 13, 2023 Company Name Country 1 8WORKS LTD United Kingdom 2 A. Constantinidi & CIA. S.C. Uruguay 3 Access Equity Enhanced Fund GP, LLC United States 4 AFCO Premium Acceptance, Inc. United States 5 AFCO Premium Credit LLC United States 6 Agnew Higgins Pickering & Co. (Bermuda) Ltd Bermuda 7 Al Heloul Al Mushrikah Lest

February 13, 2023 EX-10.54

l Savings & Investment Plan (formerly the Marsh & McLenn

MARSH & MCLENNAN COMPANIES SUPPLEMENTAL SAVINGS & INVESTMENT PLAN (formerly the Marsh & McLennan Companies Stock Investment Supplemental Plan) Restatement effective January 1, 2022 {00835594-7} PREAMBLE Effective July 1, 1992, Marsh & McLennan Companies, Inc.

February 13, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2022 OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Commission File No. 1-5998 Marsh & McLennan Companies, Inc. (Exact name of registr

February 13, 2023 EX-10.45

2023 Amendment to the Marsh & McLennan C

2023 AMENDMENT TO THE MARSH & MCLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN Effective January 12, 2023, the last sentence of Section 10(e) of the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan shall be deleted in its entirety.

February 9, 2023 SC 13G/A

MMC / Marsh & McLennan Companies, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01372-marshmclennancosinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Marsh & McLennan Cos. Inc. Title of Class of Securities: Common Stock CUSIP Number: 571748102 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box

February 8, 2023 SC 13G/A

MARSH & MCLENNAN COMPANIES, INC. - AMENDMENT NO. 8 TO SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 8) Audax Credit BDC Inc. (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class of Securities) 05070P 108 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the r

January 26, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 26, 2023 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

January 26, 2023 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

November 14, 2022 EX-10.1

, 2022, between Marsh & McLennan Companies, Inc. and John Q. Doyle

Exhibit 10.1 Steven Mills Chairman of the Compensation Committee of the Board of Directors Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com November 10, 2022 John Q. Doyle Hand delivery Subject: Terms of Employment Dear John: This letter agreement sets forth the terms of your employment by Marsh & McLennan Companies, Inc. (?Marsh McLennan?, and together w

November 14, 2022 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 26, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (

October 31, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 31, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

October 31, 2022 EX-4.1

Fifteenth Supplemental Indenture, dated October 31, 2022, between Marsh & McLennan Companies, Inc. and the Bank of New York Mellon, as trustee (incorporated by reference to the Company's Current Report on Form 8-K dated October 31, 2022)

Exhibit 4.1 MARSH & McLENNAN COMPANIES, INC., Issuer, and The Bank of New York Mellon, Trustee FIFTEENTH SUPPLEMENTAL INDENTURE Dated as of October 31, 2022 $500,000,000 aggregate principal amount of 5.750% Senior Notes due 2032 $500,000,000 aggregate principal amount of 6.250% Senior Notes due 2052 FIFTEENTH SUPPLEMENTAL INDENTURE, dated as of October 31, 2022, between MARSH & McLENNAN COMPANIES,

October 27, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 27, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

October 27, 2022 EX-99.1

MARSH McLENNAN ANNOUNCES PRICING OF $1 BILLION SENIOR NOTES OFFERING

Exhibit 99.1 Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.marshmclennan.com News release Media contact: Erick Gustafson Marsh McLennan +1 202 263 7788 [email protected] Investor contact: Sarah DeWitt Marsh McLennan +1 212 345 6750 [email protected] MARSH McLENNAN ANNOUNCES PRICING OF $1 BILLION SENIOR NOTES OFFERING NEW YORK, October 24, 20

October 27, 2022 EX-1.1

Underwriting Agreement, dated October 24, 2022, by and among Marsh & McLennan Companies, Inc. and Deutsche Bank Securities Inc., J.P. Morgan Securities LLC, Goldman Sachs & Co. LLC and Wells Fargo Securities, LLC, as representatives of the several underwriters named therein.

Exhibit 1.1 Marsh & McLennan Companies, Inc. $500,000,000 aggregate principal amount of 5.750% Senior Notes due 2032 $500,000,000 aggregate principal amount of 6.250% Senior Notes due 2052 UNDERWRITING AGREEMENT October 24, 2022 October 24, 2022 Deutsche Bank Securities Inc. J.P. Morgan Securities LLC Goldman Sachs & Co. LLC Wells Fargo Securities, LLC For themselves and as Representatives of the

October 26, 2022 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Fo

Exhibit 107 Calculation of Filing Fee Tables 424(b)(2) (Form Type) Marsh & McLennan Companies, Inc.

October 26, 2022 CORRESP

Connor Kuratek

CORRESP 1 filename1.htm Connor Kuratek Deputy General Counsel & Corporate Secretary Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T+ 212 345 8796 www.mmc.com October 26, 2022 Jennifer Gowetski Amanda Ravitz Division of Corporation Finance Disclosure Review Program U.S. Securities and Exchange Commission, 100 F Street, N.E. Washington, DC 20549 Re: Marsh & McLennan Companies, Inc. D

October 26, 2022 424B2

$1,000,000,000 Marsh & McLennan Companies, Inc. $500,000,000 5.750% Senior Notes due 2032 $500,000,000 6.250% Senior Notes due 2052

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-258194 Prospectus Supplement October 24, 2022 (To Prospectus Dated July 27, 2021) $1,000,000,000 Marsh & McLennan Companies, Inc. $500,000,000 5.750% Senior Notes due 2032 $500,000,000 6.250% Senior Notes due 2052 We will pay interest on the 5.750% Senior Notes due 2032 (the ?2032 Notes?) on May 1 and November 1 of each year,

October 24, 2022 FWP

Marsh & McLennan Companies, Inc. $500,000,000 5.750% Senior Notes due 2032 $500,000,000 6.250% Senior Notes due 2052 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: October 24, 2022 S

Final Term Sheet Filed Pursuant to Rule 433 Registration Statement No. 333-258194 October 24, 2022 Marsh & McLennan Companies, Inc. $500,000,000 5.750% Senior Notes due 2032 $500,000,000 6.250% Senior Notes due 2052 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: October 24, 2022 Settlement Date*: October 31, 2022 (T+5) Expected Ra

October 24, 2022 424B2

PRELIMINARY PROSPECTUS SUPPLEMENT SUBJECT TO COMPLETION, DATED OCTOBER 24, 2022

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-258194 The information in this preliminary prospectus supplement is not complete and may be changed. The preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permi

October 20, 2022 EX-10.2

*Letter Agreement, effective as of September 22, 2022, between Marsh & McLennan Companies, Inc. and Mark C. McGivney (incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2022)

Daniel S. Glaser President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com September 22, 2022 Subject: Terms of Employment Dear Mark, This third amendment to the Letter Agreement, dated September 17, 2015, between you and Marsh & McLennan Companies, Inc. as subsequently amended on January 17, 2018 and February 19, 2019 (togeth

October 20, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 20, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

October 20, 2022 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

October 20, 2022 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2022 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the A

September 26, 2022 EX-99.1

Marsh McLennan Announces John Q. Doyle to Succeed Daniel S. Glaser as President and Chief Executive Officer

Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.

September 26, 2022 EX-10.1

*Letter Agreement Amendment, dated September 23, 2022, between Marsh & McLennan Companies, Inc. and Daniel S. Glaser (incorporated by reference to the Company’s Current Report on Form 8-K dated September 23, 2022)

EX-10.1 2 letteragreementdatedseptem.htm EX-10.1 Steven A. Mills Chairman of the Compensation Committee of the Board of Directors Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 www.mmc.com September 23, 2022 Daniel S. Glaser Hand delivery Subject: 2020 and 2021 Terms and Conditions of Performance Stock Unit Awards Dear Dan, This letter agreement (the “Letter Agreement”) shall serve

September 26, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) September 23, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Co

July 21, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 21, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

July 21, 2022 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2022 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the Americ

July 21, 2022 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

June 17, 2022 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2021 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2021 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN AGENCY 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: MARS

June 17, 2022 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2021 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2021 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN COMPANIES 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: M

May 24, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 19, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

April 21, 2022 EX-10.5

Form of Restricted Stock Unit Award, dated as of February 23, 2022, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF RESTRICTED STOCK UNIT AWARDS GRANTED ON [DATE], 2022 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 3 IV. CHANGE IN CONTROL PROVISIONS 9 V. DEFINITIONS 10 VI. ADDITIONAL PROVISIONS 11 VII. QUESTIONS AND ADDITIONAL INFORMATION 13 I. BACKGROUND An award (?Award?) has been granted

April 21, 2022 EX-10.3

*Form of Deferred Stock Unit Award, with grant dates from March 1, 2022 through February 1, 2023, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Cliff Vesting (incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022)

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2022 THROUGH FEBRUARY 1, 2023 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 3 IV. CHANGE IN CONTROL PROVISIONS 6 V. DEFINITIONS 7 VI. ADDITIONAL PROVISIONS 8 VII. QUESTIONS AND ADDITIONAL INFORMATION 10 I. BACKGROUND An

April 21, 2022 EX-10.2

*Letter Agreement, effective as of April 1, 2022, between Marsh & McLennan Companies, Inc. and Martine Ferland (incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022)

John Q. Doyle Group President and Chief Operating Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 www.mmc.com Subject: Terms of Employment Dear Martine, This second amendment to the Letter Agreement, dated January 16, 2019, between you and Marsh & McLennan Companies, Inc. (?Marsh McLennan?) as subsequently amended on February 22, 2021 (the ?Letter Agreement?), revises the ter

April 21, 2022 EX-10.7

Form of Stock Option Award, dated as of February 23, 2022, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF STOCK OPTION AWARDS GRANTED ON [DATE], 2022 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 3 IV. CHANGE IN CONTROL PROVISIONS 6 V. DEFINITIONS 7 VI. ADDITIONAL PROVISIONS 8 VII. QUESTIONS AND ADDITIONAL INFORMATION 10 I. BACKGROUND A Stock Option award (?Award?) has been granted

April 21, 2022 EX-10.4

*Form of Deferred Stock Unit Award, with grant dates from March 1, 2022 through February 1, 2023, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Ratable Vesting (incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022)

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2022 THROUGH FEBRUARY 1, 2023 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 3 IV. CHANGE IN CONTROL PROVISIONS 6 V. DEFINITIONS 7 VI. ADDITIONAL PROVISIONS 8 VII. QUESTIONS AND ADDITIONAL INFORMATION 10 I. BACKGROUND An

April 21, 2022 EX-10.6

Form of Performance Stock Unit Award, dated as of February 23, 2022, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF PERFORMANCE STOCK UNIT AWARDS GRANTED ON [DATE], 2022 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 11 V. DEFINITIONS 10 VI. ADDITIONAL PROVISIONS 12 VII. QUESTIONS AND ADDITIONAL INFORMATION 14 I. BACKGROUND A Performance Stock Unit award (?A

April 21, 2022 EX-10.1

*Letter Agreement, effective as of January 1, 2022, between Marsh & McLennan Companies, Inc. and Peter C. Hearn (incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022)

Daniel S. Glaser President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com Subject: Terms of Employment Dear Peter, This letter agreement sets forth the terms of your continued employment as Vice Chair of Marsh & McLennan Companies, Inc. (?Marsh McLennan?, and together with its subsidiaries and affiliates, the ?Company?). This

April 21, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 21, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commis

April 21, 2022 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2022 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the Ameri

April 21, 2022 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

April 1, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registran

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

April 1, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registran

DEF 14A 1 d310397ddef14a.htm DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Com

April 1, 2022 DEF 14A

DEFINITIVE PROXY STATEMENT COURTESY PDF

March 29, 2022 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 11, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (C

February 16, 2022 EX-21.1

List of Subsidiaries of Marsh & McLennan Companies, Inc.

Exhibit 21.1 Marsh & McLennan Companies, Inc. List of Subsidiaries as of February 16, 2022 Company Name Country 1 8WORKS INC. United States 2 8WORKS LTD United Kingdom 3 A. Constantinidi & CIA. S.C. Uruguay 4 A.C.N. 000 951 146 Pty Limited Australia 5 A.C.N. 001 572 961 Pty Limited Australia 6 A.C.N. 076 935 683 Pty Limited Australia 7 A.C.N. 102 322 574 Pty Limited Australia 8 Access Equity Enhan

February 16, 2022 EX-10.75

e as of January 1, 2022 between Marsh & McLenna

Exhibit 10.75 Daniel S. Glaser President and Chief Executive Officer Marsh McLennan 1166 Avenue of the Americas New York, NY 10036 T +1 212 345 5000 www.mmc.com December 1, 2021 John Q. Doyle Hand delivery Subject: Terms of Employment Dear John, This amendment to the Letter Agreement, dated September 14, 2017, between you and Marsh & McLennan Companies, Inc. as subsequently amended on February 19,

February 16, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ? Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2021 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Commission File No. 1-5998 Marsh & McLennan Companies, Inc. (Exact name of registr

February 14, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) February 11, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Com

February 14, 2022 EX-99.1

Marsh McLennan Appoints Hafize Gaye Erkan to its Board of Directors

Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.

February 10, 2022 SC 13G/A

MMC / Marsh & McLennan Companies, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Marsh & McLennan Cos. Inc. Title of Class of Securities: Common Stock CUSIP Number: 571748102 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is f

February 7, 2022 SC 13G/A

MARSH & MCLENNAN COMPANIES, INC. - AMENDMENT NO. 7 TO SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 7) Audax Credit BDC Inc. (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class of Securities) 05070P 108 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the r

January 27, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) January 27, 2022 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

January 27, 2022 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

December 9, 2021 EX-4.1

Fourteenth Supplemental Indenture, dated December 8, 2021, between Marsh & McLennan Companies, Inc. and The Bank of New York Mellon, as trustee.

Exhibit 4.1 MARSH & McLENNAN COMPANIES, INC., Issuer, and The Bank of New York Mellon, Trustee FOURTEENTH SUPPLEMENTAL INDENTURE Dated as of December 8, 2021 $400,000,000 aggregate principal amount of 2.375% Senior Notes due 2031 $350,000,000 aggregate principal amount of 2.900% Senior Notes due 2051 FOURTEENTH SUPPLEMENTAL INDENTURE, dated as of December 8, 2021, between MARSH & McLENNAN COMPANIE

December 9, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 9, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

December 7, 2021 EX-99.1

MARSH McLENNAN ANNOUNCES PRICING OF $750 MILLION SENIOR NOTES OFFERING

Exhibit 99.1 Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.marshmclennan.com News release Media contact: Erick Gustafson Marsh McLennan +1 202 263 7788 erick,[email protected] Investor contact: Sarah DeWitt Marsh McLennan +1 212 345 6750 [email protected] MARSH McLENNAN ANNOUNCES PRICING OF $750 MILLION SENIOR NOTES OFFERING NEW YORK, December 1,

December 7, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) December 7, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

December 7, 2021 EX-1.1

Underwriting Agreement, dated December 1, 2021, by and among Marsh & McLennan Companies, Inc. and BofA Securities, Inc., Citigroup Global Markets Inc., J.P. Morgan Securities LLC, Wells Fargo Securities, LLC, Barclays Capital Inc. and HSBC Securities (USA) Inc., as representatives of the several underwriters named therein.

Exhibit 1.1 Marsh & McLennan Companies, Inc. $400,000,000 aggregate principal amount of 2.375% Senior Notes due 2031 $350,000,000 aggregate principal amount of 2.900% Senior Notes due 2051 UNDERWRITING AGREEMENT December 1, 2021 December 1, 2021 BofA Securities, Inc. Citigroup Global Markets Inc. J.P. Morgan Securities LLC Wells Fargo Securities, LLC Barclays Capital Inc. HSBC Securities (USA) Inc

December 3, 2021 424B2

CALCULATION OF REGISTRATION FEE Title Of Each Class of Securities To Be Registered Maximum Aggregate Offering Price Amount of Registration Fee(1) 2.375% Senior Notes due 2031 $400,000,000 $37,080 2.900% Senior Notes due 2051 $350,000,000 $32,445

424B2 1 d228327d424b2.htm 424B2 Table of Contents Filed Pursuant to Rule 424(b)(2) Registration Statement No. 333-258194 CALCULATION OF REGISTRATION FEE Title Of Each Class of Securities To Be Registered Maximum Aggregate Offering Price Amount of Registration Fee(1) 2.375% Senior Notes due 2031 $400,000,000 $37,080 2.900% Senior Notes due 2051 $350,000,000 $32,445 (1) Calculated in accordance with

December 1, 2021 424B2

PRELIMINARY PROSPECTUS SUPPLEMENT SUBJECT TO COMPLETION, DATED DECEMBER 1, 2021

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-258194 The information in this preliminary prospectus supplement is not complete and may be changed. The preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities and we are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permi

December 1, 2021 FWP

Marsh & McLennan Companies, Inc. $400,000,000 2.375% Senior Notes due 2031 $350,000,000 2.900% Senior Notes due 2051 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: December 1, 2021 S

Final Term Sheet Filed Pursuant to Rule 433 Registration Statement No. 333-258194 December 1, 2021 Marsh & McLennan Companies, Inc. $400,000,000 2.375% Senior Notes due 2031 $350,000,000 2.900% Senior Notes due 2051 Terms Applicable to the Notes Issuer: Marsh & McLennan Companies, Inc. Offering Format: SEC-Registered Trade Date: December 1, 2021 Settlement Date*: December 8, 2021 (T+5) Expected Ra

November 22, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) November 17, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Com

November 22, 2021 EX-99.1

Marsh McLennan Appoints John Doyle Group President and Chief Operating Officer Martin South named President and CEO of Marsh Dean Klisura named President and CEO of Guy Carpenter

Marsh McLennan 1166 Avenue of the Americas New York, New York, 10036-2774 T +212 345 5000 www.

October 21, 2021 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.marshmclennan.com

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

October 21, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) October 21, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Comm

October 21, 2021 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended September 30, 2021 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the A

July 27, 2021 EX-25.2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTE

Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdiction

July 27, 2021 EX-25.1

Statement of Eligibility on Form T-1 under the Trust Indenture Act of 1939, as amended, of The Bank of New York Mellon, as trustee for the Indenture dated as of July 15, 2011.

Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) || THE BANK OF NEW YORK MELLON (Exact name of trustee as specified in its charter) New York (Jurisdiction

July 27, 2021 S-3ASR

As filed with the Securities and Exchange Commission on July 27, 2021

As filed with the Securities and Exchange Commission on July 27, 2021 Registration No.

July 22, 2021 EX-99.1

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.mmc.com MARSH McLENNAN REPORTS SECOND QUARTER 2021 RESULTS GAAP Revenue Increases 20%; Underlying Revenue Rises 13% Growth in GAAP Operating Income of 39% and A

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

July 22, 2021 EX-10.1

gements for Independent Directors of Marsh & McLenna

Description of Compensation Arrangements for Independent Directors Effective June 1, 2021, which will be the start of the Board?s annual pay cycle, Marsh & McLennan Companies, Inc.

July 22, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) July 22, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commiss

July 22, 2021 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended June 30, 2021 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the Americ

June 25, 2021 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2020 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2020 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN COMPANIES 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: M

June 25, 2021 11-K

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2020 SEC NO. 1-5998

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE YEAR ENDED DECEMBER 31, 2020 SEC NO. 1-5998 A. Full title of the Plan: MARSH & McLENNAN AGENCY 401(k) SAVINGS & INVESTMENT PLAN B. Name of issuer of the securities held pursuant to the Plan and the address of its principal executive office: MARS

May 24, 2021 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) May 20, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commissi

April 27, 2021 EX-10.5

Form of Deferred Stock Unit Award, with grant dates from March 1, 2021 through February 1, 2022, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Ratable Vesting

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2021 THROUGH FEBRUARY 1, 2022 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 7 V. DEFINITIONS 8 VI. ADDITIONAL PROVISIONS 9 VII. QUESTIONS AND ADDITIONAL INFORMATION 12 I. BACKGROUND An

April 27, 2021 EX-10.3

*Letter Agreement, effective as of January 20, 2021, between Marsh & McLennan Companies, Inc. and Martine Ferland (incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2021)

Daniel S. Glaser President and Chief Executive Office Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, New York 10036 212 345 4874 Fax 212 345 6676 [email protected] www.mmc.com February 22, 2021 Martine Ferland Electronic delivery Subject: Terms of Employment Dear Martine: This first amendment to the Letter Agreement, dated January 16, 2019, between you and Marsh & McLennan

April 27, 2021 EX-10.6

Form of Restricted Stock Unit Award, dated as of February 22, 2021, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF RESTRICTED STOCK UNIT AWARDS GRANTED ON [DATE] 2021 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 11 V. DEFINITIONS 11 VI. ADDITIONAL PROVISIONS 13 VII. QUESTIONS AND ADDITIONAL INFORMATION 16 I. BACKGROUND An award (?Award?) has been granted

April 27, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported) April 27, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commis

April 27, 2021 EX-10.4

Form of Deferred Stock Unit Award, with grant dates from March 1, 2021 through February 1, 2022, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan – Cliff Vesting

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF DEFERRED STOCK UNIT AWARDS WITH GRANT DATES FROM MARCH 1, 2021 THROUGH FEBRUARY 1, 2022 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 3 IV. CHANGE IN CONTROL PROVISIONS 6 V. DEFINITIONS 7 VI. ADDITIONAL PROVISIONS 8 VII. QUESTIONS AND ADDITIONAL INFORMATION 10 I. BACKGROUND An

April 27, 2021 10-Q

Quarterly Report - 10-Q

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the quarterly period ended March 31, 2021 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Marsh & McLennan Companies, Inc. 1166 Avenue of the Ameri

April 27, 2021 EX-10.8

*Form of Stock Option Award, dated as of February, 22, 2021, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award (incorporated by reference to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2021)

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF STOCK OPTION AWARDS GRANTED ON [DATE] 2021 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 3 IV. CHANGE IN CONTROL PROVISIONS 7 V. DEFINITIONS 8 VI. ADDITIONAL PROVISIONS 9 VII. QUESTIONS AND ADDITIONAL INFORMATION 12 I. BACKGROUND A Stock Option award (?Award?) has been granted

April 27, 2021 EX-10.7

Form of Performance Stock Unit Award, dated as of February 22, 2021, under the Marsh & McLennan Companies, Inc. 2020 Incentive and Stock Award Plan

MARSH & McLENNAN COMPANIES, INC. 2020 INCENTIVE AND STOCK AWARD PLAN TERMS AND CONDITIONS OF PERFORMANCE STOCK UNIT AWARDS GRANTED ON [DATE] 2021 TABLE OF CONTENTS Page I. BACKGROUND 1 II. AWARDS 1 III. EMPLOYMENT EVENTS 4 IV. CHANGE IN CONTROL PROVISIONS 11 V. DEFINITIONS 13 VI. ADDITIONAL PROVISIONS 14 VII. QUESTIONS AND ADDITIONAL INFORMATION 17 I. BACKGROUND A Performance Stock Unit award (?Aw

April 27, 2021 EX-99.1

MARSH McLENNAN REPORTS FIRST QUARTER 2021 RESULTS First Quarter Revenue Growth of 9% Including Underlying Revenue Growth of 6% First Quarter GAAP EPS of $1.91; Adjusted EPS Increases 21% to $1.99 GAAP Operating Income Rises 27%; Adjusted Operating In

Marsh McLennan 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.

April 2, 2021 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Termination of a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (Date of earliest event reported) April 2, 2021 Marsh & McLennan Companies, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 1-5998 36-2668272 (State or Other Jurisdiction of Incorporation) (Commission

April 2, 2021 EX-10.1

Amended and Restated 5 Year Credit Agreement, dated as of April 2, 2021, among Marsh & McLennan Companies, Inc., the designated subsidiaries party thereto as borrowers, Citibank, N.A., as administrative agent, and the lenders from time to time party thereto (incorporated by reference to the Company’s Current Report on Form 8-K filed on April 2, 2021)

Exhibit 10.1 EXECUTION COPY US$2,800,000,000 AMENDED AND RESTATED 5 YEAR CREDIT AGREEMENT dated as of April 2, 2021 Among Marsh & McLennan Companies, Inc. MMC Treasury Holdings (UK) Limited and the Designated Subsidiaries referred to herein as Borrowers, The Lenders Listed Herein and Citibank, N.A. as Administrative Agent Bank of America, N.A., Deutsche Bank Securities Inc. HSBC Bank USA, National

March 31, 2021 DEF 14A

DEFINITIVE PROXY STATEMENT COURTESY PDF

2021 Notice of Annual Meeting and Proxy StatementABOUT US Consulting Mercer Health, Wealth & Career Consulting Risk & Insurance Services Marsh Insurance Broking & Risk Management Guy Carpenter Reinsurance & Capital Strategies Oliver Wyman Strategy, Economic & Brand Consulting We are 76,000 colleagues in four global businesses united by a common purpose—to make a difference in the moments that matter.

March 31, 2021 DEFA14A

- DEFA14A

DEFA14A 1 d81851ddefa14a.htm DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule

March 31, 2021 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

February 17, 2021 EX-21.1

List of Subsidiaries of Marsh & McLennan Companies, Inc.

Exhibit 21.1 Marsh & McLennan Companies, Inc. List of Subsidiaries as of February 17, 2021 Company Name Country 1 8WORKS INC. United States 2 8WORKS LTD United Kingdom 3 A. Constantinidi & CIA. S.C. Uruguay 4 A.C.N. 000 951 146 Pty Limited Australia 5 A.C.N. 001 572 961 Pty Limited Australia 6 A.C.N. 076 935 683 Pty Limited Australia 7 A.C.N. 102 322 574 Pty Limited Australia 8 Access Equity Enhan

February 17, 2021 10-K

Annual Report - FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ? Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2020 OR ? Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Commission File No. 1-5998 Marsh & McLennan Companies, Inc. (Exact name of registr

February 17, 2021 EX-10.62

Fourth Amendment to the Marsh & McLennan Companies Supplemental Savings & Investment Plan Restatement effective January 1, 2012

FOURTH AMENDMENT TO THE MARSH & MCLENNAN COMPANIES SUPPLEMENTAL SAVINGS & INVESTMENT PLAN WHEREAS, Marsh & McLennan Companies, Inc.

February 12, 2021 SC 13G/A

MARSH & MCLENNAN COMPANIES, INC. - AMENDMENT NO. 6 TO SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6) Audax Credit BDC Inc. (Name of Issuer) Common Stock, par value $0.001 per share (Title of Class of Securities) 05070P 108 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the r

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: Marsh & McLennan Cos. Inc. Title of Class of Securities: Common Stock CUSIP Number: 571748102 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is f

January 28, 2021 EX-99.1

Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.mmc.com

Marsh & McLennan Companies, Inc. 1166 Avenue of the Americas New York, New York 10036-2774 212 345 5000 www.mmc.com Exhibit 99.1 NEWS RELEASE MARSH & McLENNAN REPORTS FOURTH QUARTER AND FULL-YEAR 2020 RESULTS Full-Year Revenue Growth of 3%; Underlying Revenue Growth of 1% Full-Year GAAP Operating Income Rises 14%; Adjusted Operating Income Increases 9% Full-Year GAAP EPS Increases 16% to $3.94; Ad

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