X0306 4 2015-02-28 0000062709 MARSH & MCLENNAN COMPANIES, INC. MMC 0001518326 MOCZARSKI ALEXANDER S 1166 AVENUE OF THE AMERICAS NEW YORK NY 10036 1 President & CEO, Guy Carpenter Common Stock 2015-02-28 4 M 0 33474 0 A 83434.028 D Common Stock 2015-02-28 4 F 0 18687 56.99 D 64747.028 D Restricted Stock Units 2015-02-28 4 M 0 33474 0 D Common Stock 33474 15233 D Vesting and distribution to reporting person of 33,474 shares underlying restricted stock units of which 18,687 were withheld by Marsh & McLennan Companies to cover applicable taxes. These 33,474 shares underlying restricted stock units relate to 3,921 restricted stock units that were granted on February 24, 2012, 23,524 restricted stock units relating to performance stock units that were granted on February 24, 2012 for the performance period 2012-2014, 3,425 restricted stock units that were granted on February 25, 2013 and 2,604 restricted stock units that were granted on February 24, 2014. Includes dividend reinvestment shares acquired on November 17, 2014 and February 13, 2015. The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis. Not Applicable. /s/ Tiffany D. Wooley, Attorney-in-Fact 2015-03-03