X0508 4 2025-12-05 0 0001408198 MSCI Inc. MSCI 0001416750 Fernandez Henry A MSCI INC. 7 WORLD TRADE CENTER, 250 GREENWICH ST. NEW YORK NY 10007 1 1 0 0 Chairman and CEO 0 Common Stock 2025-12-05 4 P 0 360 531.98 A 1477197 D Common Stock 2025-12-05 4 P 0 1124 533.12 A 1478321 D Common Stock 2025-12-05 4 P 0 1043 534.55 A 1479364 D Common Stock 2025-12-05 4 P 0 3190 535.51 A 1482554 D Common Stock 2025-12-05 4 P 0 1892 536.34 A 1484446 D Common Stock 2025-12-05 4 P 0 431 537.31 A 1484877 D Common Stock 2025-12-05 4 P 0 504 538.77 A 1485381 D Common Stock 2025-12-05 4 P 0 1106 539.57 A 1486487 D Common Stock 2025-12-05 4 P 0 480 540.46 A 1486967 D Common Stock 2025-12-05 4 P 0 80 541.23 A 1487047 D Common Stock 2025-12-05 4 P 0 140 532.37 A 332919 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 260 533.22 A 333179 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 547 535.10 A 333726 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 552 536.02 A 334278 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 317 536.90 A 334595 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 80 537.75 A 334675 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 114 539.35 A 334789 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 240 540.37 A 335029 I By Fernandez 2007 Children's Trust Common Stock 2025-12-05 4 P 0 40 541.90 A 335069 I By Fernandez 2007 Children's Trust Common Stock 309821 I By Henry Fernandez 2024 MSCI Annuity Trust Common Stock 15400 I By Son Common Stock 15400 I By Son Common Stock 15400 I By Daughter This transaction was executed in multiple trades at prices ranging from $531.57 to $532.56. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. The balance shown reflects the transfer of 196,886 shares previously indirectly held by the Henry Fernandez 2024 MSCI Annuity Trust (the "2024 GRAT"), a grantor retained annuity trust established by the Reporting Person to direct holdings of the Reporting Person following a scheduled annuity payment from the 2024 GRAT. This transaction was executed in multiple trades at prices ranging from $532.72 to $533.55. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $534.00 to $534.86. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $535.00 to $535.99. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $536.00 to $536.97. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $537.12 to $537.74. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $538.16 to $538.97. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $539.27 to $540.15. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $540.35 to $540.50. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $531.79 to $532.60. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $533.12 to $533.26. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $534.59 to $535.58. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $535.67 to $536.59. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $536.75 to $537.15. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $538.95 to $539.66. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. This transaction was executed in multiple trades at prices ranging from $540.05 to $540.46. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the issuer or the security holders of the issuer full information regarding the number of shares and prices at which each transaction was effected. /s/ Cecilia Aza, attorney-in-fact 2025-12-09