Msci 4: Rattray Sandy C. sold 32 shares of Common Stock at $N/A on… (May 5, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: MSCI Inc. (MSCI) CIK: 0001408198 --- Reporting Owner --- Name: Rattray Sandy C. CIK: 0001801716 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-01 | Code: F (Payment of exercise/tax) Shares: -32 | Price: $0.00 Shares Owned After: 2,417 | Ownership: D (Direct) Footnotes: [F1] 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. [Transaction #2] Security: Common Stock Date: 2026-05-01 | Code: A (Grant or award) Shares: +388 | Price: $0.00 Shares Owned After: 2,805 | Ownership: D (Direct) Footnotes: [F2] Restricted stock units vesting on May 1, 2027. --- Footnotes (Complete Index) --- F1: 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. F2: Restricted stock units vesting on May 1, 2027. --- Signature --- /s/ /s/ Cecilia Aza, attorney-in-fact (2026-05-05)