Item 9B. Other Information

During the three months ended December 31, 2023, none of the Company’s directors or officers, as defined in Section 16 of the Exchange Act, adopted or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K of the Exchange Act.

On February 8, 2024, the Board of Directors (the “Board”) of MSCI Inc. (the “Company”) approved and adopted amendments to the Company’s Amended and Restated Bylaws (the “Bylaws”), effective as of February 8, 2024, to permit one or more stockholders of record or beneficial owners holding not less than 15% of the voting power of shares of the Company’s capital stock continuously for at least one year the right to call a special meeting of stockholders (the “Special Meeting Right”).

In connection with the adoption of the Special Meeting Right, the Bylaws were also amended to provide for certain procedural requirements for stockholders to call a special meeting of stockholders and to provide for other technical, conforming and clarifying revisions.

The foregoing description of the Bylaws does not purport to be complete and is qualified in its entirety by reference to the Bylaws, a copy of which is which is attached to this Annual Report on Form 10-K as Exhibit 3.2 and incorporated herein by reference.