X0303 4 2011-02-21 0000062709 MARSH & MCLENNAN COMPANIES, INC. MMC 0001197664 BURNS M MICHELE 1166 AVENUE OF THE AMERICAS NEW YORK NY 10036 1 Chairman & CEO, Mercer Restricted Stock Units 2011-02-21 4 A 0 15526 0 A Common Stock 15526 91878 D Restricted Stock Units 2011-02-21 4 A 0 7255 0 A Common Stock 7255 99133 D Stock Options (Right to Buy) 30.595 2011-02-21 4 A 0 142429 0 A 2021-02-20 Common Stock 142429 142429 D The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis. These restricted stock units vest in three equal annual installments on February 15, 2012, February 15, 2013, and February 15, 2014. Not Applicable. These restricted stock units relate to performance based restricted stock units that were granted on February 26, 2008. These restricted stock units relate to the 2010 performance year and vest on February 26, 2011. These options vest in four equal annual installments on February 21, 2012, February 21, 2013, February 21, 2014, and February 21, 2015. /s/ Lucy Fato, Attorney-in-Fact 2011-02-23