X0609 4 2026-05-15 0 0001408198 MSCI Inc. MSCI 0001416750 Fernandez Henry A false MSCI INC. 7 WORLD TRADE CENTER, 250 GREENWICH ST. NEW YORK NY 10007 1 1 0 0 Chairman and CEO 0 Common Stock 2026-05-15 4 P 0 120 559.40 A 1728081 D Common Stock 2026-05-15 4 P 0 240 560.28 A 1728321 D Common Stock 2026-05-15 4 P 0 1238 561.56 A 1729559 D Common Stock 2026-05-15 4 P 0 1122 562.47 A 1730681 D Common Stock 2026-05-15 4 P 0 800 563.39 A 1731481 D Common Stock 2026-05-15 4 P 0 400 564.42 A 1731881 D Common Stock 2026-05-15 4 P 0 80 565.17 A 1731961 D Common Stock 410776 I By Fernandez 2007 Children's Trust Common Stock 15400 I By Son Common Stock 15400 I By Son Common Stock 15400 I By Daughter Option to purchase common stock 549.83 2025-02-03 2032-02-03 Common Stock 29564 29564 D Premium option to purchase common stock 1000 2030-01-31 2035-01-31 Common Stock 36846 36846 D Premium option to purchase common stock 1100 2030-01-31 2035-01-31 Common Stock 40780 40780 D Premium option to purchase common stock 1200 2030-01-31 2035-01-31 Common Stock 44920 44920 D Option to purchase common stock 554.52 2026-02-02 2033-02-02 Common Stock 42193 42193 D This transaction was executed in multiple trades at prices ranging from $558.85 to $559.83. 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 $559.90 to $560.75. 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 $560.91 to $561.88. 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 $562.01 to $562.96. 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 $563.03 to $563.90. 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 $564.12 to $564.74. 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 $565.16 to $565.17. 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 2026-05-18