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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * McDonald Scott   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) President and CEO of OWG (Last) (First) (Middle) 1166 AVENUE OF THE AMERICAS 3. Date of Earliest Transaction (Month/Day/Year) 02/28/2018 (Street) NEW YORK, NY 10036 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 02/28/2018   M(1)   11,791 A $ 0 50,103.3748 (2) D   Common Stock 02/28/2018   F(1)   5,543 D $ 84.87 44,560.3748 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction 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 (Month/Day/Year)

7. Title and Amount of Underlying Securities (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)

02/28/2018

M(1)

11,791

(4)

(4)

Common Stock

11,791

$ 0

10,051

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
McDonald Scott 1166 AVENUE OF THE AMERICAS NEW YORK, NY 10036			President and CEO of OWG

Signatures

/s/ Tiffany D. Wooley, Attorney-in-Fact		03/02/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Vesting and distribution to reporting person of 11,791 shares underlying restricted stock units of which 5,543 were withheld by Marsh & McLennan Companies to cover applicable taxes. These 11,791 shares underlying restricted stock units relate to 1,833 restricted stock units that were granted on February 23, 2015, 6,433 restricted stock units relating to performance stock units that were granted on February 23, 2015 for the performance period 2015-2017, 1,817 restricted stock units that were granted on February 22, 2016 and 1,708 restricted stock units that were granted on February 22, 2017.
(2)	Includes dividend reinvestment shares acquired on February 15, 2018.
(3)	The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis.
(4)	Not Applicable.

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