X0306 4 2019-02-06 0 0001408198 MSCI Inc. MSCI 0001416752 Pettit CD Baer MSCI INC. 7 WORLD TRADE CENTER, 250 GREENWICH ST NEW YORK NY 10007 0 1 0 0 President Common Stock 2019-02-06 4 F 0 578 171.95 D 178706 D Common Stock 2019-02-07 4 A 0 2445 0.00 A 181151 D Common Stock 2019-02-07 4 F 0 6319 172.45 D 174832 D Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of the first tranche of 1,229 restricted stock units granted on February 6, 2018. Represents the number of shares of common stock issued following the vesting and conversion of the second tranche of performance stock units ("PSUs") granted to the reporting person on January 27, 2015, upon certification by the Committee of the achievement of certain cumulative performance metrics for the 2015, 2016, 2017 and 2018 fiscal years, and reflects only the number of shares in excess of the amount previously reported with respect to such second tranche of PSUs on the Form 4 filed by the reporting person with the SEC on January 29, 2015. Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of the second tranche of 13,443 PSUs granted on January 27, 2015. /s/ Cecilia Aza, attorney-in-fact 2019-02-08