MSCI · MSCI Inc.

This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 3, 2025.

Represents shares received, at the Reporting Person's election, in lieu of the Reporting Person's pro-rated cash retainer for committee service.

Shares acquired by the Reporting Person in connection with MSCI Inc.'s payment of a dividend. Of the shares reported, 1 share is attributable to the Reporting Person's unvested RSUs and remains subject to the same vesting conditions as the underlying RSUs. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the earlier of June 1, 2033 and the 60th day after such Reporting Person's "separation from service" as a director.

Shares acquired by the Reporting Person in connection with MSCI Inc.'s payment of a dividend. Of the shares reported, 1 share is attributable to the Reporting Person's unvested RSUs and remains subject to the same vesting conditions as the underlying RSUs. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of 1 share until the 60th day after such Reporting Person's "separation from service" as a director and 1 share until the earlier of June 1, 2031 and the 60th day after such Reporting Person's "separation from service" as a director.

Shares acquired by the Reporting Person in connection with MSCI Inc.'s payment of a dividend. Of the shares reported, 1 share is attributable to the Reporting Person's unvested RSUs and remains subject to the same vesting conditions as the underlying RSUs. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the 60th day after such Reporting Person's "separation from service" as a director.

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 $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 $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 $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 $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.

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.

Restricted stock units vesting on May 1, 2027. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the 60th day after such Reporting Person's "separation from service" as a director.

Restricted stock units vesting on May 1, 2027.

Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of 385 restricted stock units ("RSUs") granted on May 1, 2025.

Restricted stock units vesting on May 1, 2027.

Restricted stock units vesting on May 1, 2027.

Restricted stock units vesting on May 1, 2027. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the earlier of June 1, 2033 and the 60th day after such Reporting Person's "separation from service" as a director.

Restricted stock units vesting on May 1, 2027.

Restricted stock units vesting on May 1, 2027.

Restricted stock units vesting on May 1, 2027.

Restricted stock units vesting on May 1, 2027.

Restricted stock units vesting on May 1, 2027. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the earlier of June 1, 2031 and the 60th day after such Reporting Person's "separation from service" as a director.

The reported transaction reflects the distribution of the remaining shares held by the 2024 GRAT to The Fernandez 2007 Children's Trust upon the scheduled termination of the 2024 GRAT. The spouse of the Reporting Person is the trustee of The Fernandez 2007 Children's Trust.

The balance shown reflects the transfer of 234,114 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, reflecting the final scheduled annuity payment from the 2024 GRAT.

The reported transaction reflects the distribution of the remaining shares held by the 2024 GRAT to The Fernandez 2007 Children's Trust upon the scheduled termination of the 2024 GRAT. The spouse of the Reporting Person is the trustee of The Fernandez 2007 Children's Trust.

This transaction was executed in multiple trades at prices ranging from $592.00 to $592.99. The price reported above reflects the weighted average sale 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 effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 3, 2025.

Shares acquired by the Reporting Person in connection with MSCI Inc.'s payment of a dividend. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the earlier of June 1, 2033 and the 60th day after such Reporting Person's "separation from service" as a director.

Shares acquired by the Reporting Person in connection with MSCI Inc.'s payment of a dividend. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the 60th day after such Reporting Person's "separation from service" as a director.

Shares acquired by the Reporting Person in connection with MSCI Inc.'s payment of a dividend. Pursuant to the MSCI Inc. Non-Employee Directors Deferral Plan, the Reporting Person has elected to defer receipt of the shares until the 60th day after such Reporting Person's "separation from service" as a director.

This transaction was executed in multiple trades at prices ranging from $542.645 to $543.50. 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.

The balance shown reflects the transfer of 759 shares previously directly held by the Reporting Person to indirect holdings by the Reporting Person.

The reported shares of the Issuer are directly held by 1000396766 Ontario Inc. ("Ontario Inc."), an entity over which the Reporting Person retains sole investment and voting control. The common shares of Ontario Inc. are held by the Ashe Trust, a trust of which the Reporting Person and his spouse are trustees and the Reporting Person, his spouse and his children are beneficiaries.

This transaction was executed in multiple trades at prices ranging from $518.97 to $519.89. 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 $516.77 to $517.67. 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 $523.68 to $524.65. 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.

Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of 1,001 restricted stock units granted on February 2, 2023.

Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of 1,218 restricted stock units granted on February 2, 2023.

Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of 1,137 restricted stock units granted on February 2, 2023.

Represents shares reacquired by MSCI Inc. to satisfy tax withholding obligations in connection with the vesting and conversion to shares of 731 restricted stock units granted on February 2, 2023.

Restricted stock units ("RSUs") that are expected to vest and convert to shares on the third anniversary of the grant date. The final number of shares issued upon vesting will be between 100% and 130% of the target number of RSUs based on achievement of a performance metric for the for the 2026 fiscal year (January 1, 2026 through December 31, 2026).

Restricted stock units ("RSUs") that are expected to vest and convert to shares on the third anniversary of the grant date. The final number of shares issued upon vesting will be between 100% and 130% of the target number of RSUs based on achievement of a performance metric for the for the 2026 fiscal year (January 1, 2026 through December 31, 2026).

Restricted stock units ("RSUs") that are expected to vest and convert to shares on the third anniversary of the grant date. The final number of shares issued upon vesting will be between 100% and 130% of the target number of RSUs based on achievement of a performance metric for the for the 2026 fiscal year (January 1, 2026 through December 31, 2026).

Restricted stock units ("RSUs") that are expected to vest and convert to shares on the third anniversary of the grant date. The final number of shares issued upon vesting will be between 100% and 130% of the target number of RSUs based on achievement of a performance metric for the for the 2026 fiscal year (January 1, 2026 through December 31, 2026).

Restricted stock units ("RSUs") that are expected to vest and convert to shares on the third anniversary of the grant date. The final number of shares issued upon vesting will be between 100% and 130% of the target number of RSUs based on achievement of a performance metric for the for the 2026 fiscal year (January 1, 2026 through December 31, 2026).

Represents the number of performance stock options ("PSOs") to purchase common stock earned by the reporting person following the certification by the Compensation, Talent and Culture Committee on January 26, 2026 of the achievement of the performance condition applicable to the PSOs. The PSOs were granted on February 2, 2023 and vest on the third anniversary of the grant date, subject to continuous service through such date and satisfaction of the performance condition for the performance period from January 1, 2023 and ending on December 31, 2025. The performance condition for the PSOs was met with respect to 23,781 shares of common stock, and the PSOs are scheduled to vest on February 2, 2026.

Represents the number of performance stock options ("PSOs") to purchase common stock earned by the reporting person following the certification by the Compensation, Talent and Culture Committee on January 26, 2026 of the achievement of the performance condition applicable to the PSOs. The PSOs were granted on February 2, 2023 and vest on the third anniversary of the grant date, subject to continuous service through such date and satisfaction of the performance condition for the performance period from January 1, 2023 and ending on December 31, 2025. The performance condition for the PSOs was met with respect to 3,624 shares of common stock, and the PSOs are scheduled to vest on February 2, 2026.

Represents the number of performance stock options ("PSOs") to purchase common stock earned by the reporting person following the certification by the Compensation, Talent and Culture Committee on January 26, 2026 of the achievement of the performance condition applicable to the PSOs. The PSOs were granted on February 2, 2023 and vest on the third anniversary of the grant date, subject to continuous service through such date and satisfaction of the performance condition for the performance period from January 1, 2023 and ending on December 31, 2025. The performance condition for the PSOs was met with respect to 5,639 shares of common stock, and the PSOs are scheduled to vest on February 2, 2026.