MMC Marsh and McLennan Companies Inc

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 * Mills Stacy	2. Issuer Name and Ticker or Trading Symbol MARSH & MCLENNAN COMPANIES, INC. [ MMC ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) Vice President and Controller
(Last)          (First)          (Middle) 1166 AVENUE OF THE AMERICAS	3. Date of Earliest Transaction (MM/DD/YYYY) 2/28/2021
(Street) NEW YORK NY (City)        (State)        (Zip)	4. 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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	2/28/2021		M(1)		2598	A	$0	5521.083 (2)	D
Common Stock	2/28/2021		F(1)		1164	D	$116.83	4357.083	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(3)	2/28/2021		M (1)			2598	(4)	(4)	Common Stock	2598	$0	3151	D

Explanation of Responses:
(1)	Vesting and distribution to reporting person of 2,598 shares underlying restricted stock units of which 1,164 were withheld by Marsh & McLennan Companies to cover applicable taxes. These 2,598 shares underlying restricted stock units relate to 603 restricted stock units that were granted on February 21, 2018, 995 restricted stock units relating to performance stock units that were granted on February 21, 2018 for the performance period 2018-2020, 551 restricted stock units that were granted on February 19, 2019 and 449 restricted stock units that were granted on February 19, 2020.
(2)	Includes dividend reinvestment shares acquired on May 15, 2020, August 14, 2020, November 13, 2020 and February 12, 2021.
(3)	The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis.
(4)	Not Applicable.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mills Stacy 1166 AVENUE OF THE AMERICAS NEW YORK NY			Vice President and Controller

Signatures
/s/ Tiffany D. Wooley, Attorney-in-Fact		3/2/2021
**Signature of Reporting Person		Date