FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * Klisura Dean Michael 2. Date of Event Requiring Statement (MM/DD/YYYY)
1/1/2022 

3. Issuer Name and Ticker or Trading Symbol MARSH & MCLENNAN COMPANIES, INC. [MMC]
(Last)       (First)       (Middle)
1166 AVENUE OF THE AMERICAS
4. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
President & CEO, Guy Carpenter /
(Street)
NEW YORK, NY       
(City)             (State)             (Zip)
5. If Amendment, Date Original Filed(MM/DD/YYYY)
 

6. Individual or Joint/Group Filing(Check Applicable Line)_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock  25615  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options (Right to Buy)   (1) 2/21/2026  Common Stock  12976  $57.325  D   
Stock Options (Right to Buy)   (2) 2/21/2027  Common Stock  9994  $73.195  D   
Stock Options (Right to Buy)   (3) 2/20/2028  Common Stock  9569  $83.046  D   
Stock Options (Right to Buy)   (4) 2/18/2029  Common Stock  10516  $90.785  D   
Stock Options (Right to Buy)   (5) 2/18/2030  Common Stock  11856  $118.865  D   
Stock Options (Right to Buy)   (6) 2/21/2031  Common Stock  11237  $117.53  D   
Restricted Stock Units   (7)  (7) Common Stock  14461   (8) D   
Restricted Stk. Units (SSIP)   (7)  (7) Common Stock  1575.971   (8) D   

Explanation of Responses:
(1)  These options were granted on February 22, 2016 and vested in four equal annual installments on February 22nd of 2017, 2018, 2019 and 2020.
(2)  These options were granted on February 22, 2017 and vested in four equal annual installments on February 22nd of 2018, 2019, 2020 and 2021.
(3)  These options were granted on February 21, 2018 and vested in four equal annual installments on February 21st of 2019, 2020, 2021 and 2022.
(4)  These options were granted on February 19, 2019 and vest in four equal annual installments on February 19th of 2020, 2021, 2022 and 2023.
(5)  These options were granted on February 19, 2020 and vest in four equal annual installments on February 19th of 2021, 2022, 2023 and 2024.
(6)  These options were granted on February 22, 2021 and vest in four equal annual installments on February 22nd of 2022, 2023, 2024 and 2025.
(7)  Not Applicable.
(8)  The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Klisura Dean Michael
1166 AVENUE OF THE AMERICAS
NEW YORK, NY 


President & CEO, Guy Carpenter

Signatures
/s/ Courtenay Birchler, Attorney-in-fact 1/10/2022
**Signature of Reporting Person Date
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