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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."}],"balance_after":23588,"source":{"system":"sec-edgar","filing":"0002101503-26-000009","document":"wk-form4_1777406449.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1408198/000210150326000009/wk-form4_1777406449.xml","form_type":"4"}},{"id":919265,"issuer":{"id":3075,"kind":"organization","name":"MSCI Inc.","symbol":"MSCI"},"owners":[{"id":51004,"kind":"person","name":"Munari Alvise J.","position":1,"cik":"0002101503","reported_name":"Munari Alvise J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Product Officer"}}],"security":"Common Stock","published_at":"2026-02-04T21:05:32.000Z","date":"2026-02-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":438,"price":624.75,"value":273640.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."}],"balance_after":33548,"source":{"system":"sec-edgar","filing":"0002101503-26-000006","document":"wk-form4_1770239108.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1408198/000210150326000006/wk-form4_1770239108.xml","form_type":"4"}},{"id":921582,"issuer":{"id":3075,"kind":"organization","name":"MSCI Inc.","symbol":"MSCI"},"owners":[{"id":51004,"kind":"person","name":"Munari Alvise J.","position":1,"cik":"0002101503","reported_name":"Munari Alvise J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Product Officer"}}],"security":"Common Stock","published_at":"2026-02-03T21:01:45.000Z","date":"2026-01-30","kind":"grant","planned":false,"acquired":true,"shares":3158,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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)."}],"balance_after":33986,"source":{"system":"sec-edgar","filing":"0002101503-26-000004","document":"wk-form4_1770152502.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1408198/000210150326000004/wk-form4_1770152502.xml","form_type":"4"}},{"id":928897,"issuer":{"id":3075,"kind":"organization","name":"MSCI Inc.","symbol":"MSCI"},"owners":[{"id":51004,"kind":"person","name":"Munari Alvise J.","position":1,"cik":"0002101503","reported_name":"Munari Alvise J.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Product Officer"}}],"security":"Option to purchase common stock","published_at":"2026-01-28T21:04:07.000Z","date":"2026-01-26","kind":"grant","planned":false,"acquired":true,"shares":6042,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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 6,042 shares of common stock, and the PSOs are scheduled to vest on February 2, 2026."}],"balance_after":6042,"derivative":{"exercise_price":554.52,"exercise_date":"2026-02-02","expiration_date":"2033-02-02","underlying":"Common Stock","underlying_shares":6042},"source":{"system":"sec-edgar","filing":"0002101503-26-000002","document":"wk-form4_1769634244.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1408198/000210150326000002/wk-form4_1769634244.xml","form_type":"4"}}]}