X0306 4 2018-02-02 0 0001408198 MSCI Inc. MSCI 0001560708 Zangari Peter J. MSCI INC. 7 WORLD TRADE CENTER, 250 GREENWICH ST. NEW YORK NY 10007 0 1 0 0 Global Head of Research Common Stock 2018-02-02 4 A 0 9307 0.00 A 77024 D Common Stock 2018-02-02 4 F 0 3651 142.53 D 73373 D Common Stock 2018-02-02 4 A 0 1512 0.00 A 74885 D Common Stock 2018-02-02 4 F 0 4780 142.53 D 70105 D Common Stock 2018-02-06 4 A 0 1621 0.00 A 71726 D Represents the number of shares of common stock issued following the vesting and conversion of performance stock units ("PSUs") granted to the reporting person on January 27, 2015, upon certification by the Compensation and Talent Management Committee (the "Committee") of the achievement of certain cumulative performance metrics for the 2015, 2016 and 2017 fiscal years. Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of 9,307 PSUs granted to the reporting person on January 27, 2015. Represents the number of shares of common stock issued following the vesting and conversion of the first tranche of 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 and 2017 fiscal years, and reflects only the number of shares in excess of the amount previously reported with respect to such first 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 first tranche of 9,761 PSUs granted on January 27, 2015. Restricted stock units ("RSUs") ratably vesting and converting to shares on the first, second and third anniversaries of the grant date. Each RSU represents a contingent right to receive one share of MSCI common stock. /s/ Cecilia Aza, attorney-in-fact 2018-02-06