QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the quarterly period ended June30, 2026OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 MSCI INC.(Exact Name of Registrant as Specified in its Charter)________________________________________ 13-4038723 (I.R.S. EmployerIdentification Number) Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Actof 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has beensubject to such filing requirements for the past 90 days. YesNo Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required tosubmit such files). YesNo Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,”and “emerging growth company” in Rule 12b-2 of the Exchange Act. Non-accelerated filer If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complyingwith any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. As of July14, 2026, there were 72.7 million shares of the registrant’s Common Stock, par value $0.01, outstanding. FOR THE QUARTER ENDED JUNE30, 2026TABLE OF CONTENTS Item 1.Financial Statements4Condensed Consolidated Statements of Financial Condition as of June 30, 2026 and December 31, 20254Condensed Consolidated Statements of Income for the three and six months ended June 30, 2026 and 20255Condensed Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2026 and20256Condensed Consolidated Statements of Shareholders' Equity (Deficit) for the three and six months ended June 30, 2026and 20257Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2026 and 20259Notes to Condensed Consolidated Financial Statements101. Introduction and Basis of Presentation102. Recent Accounting Pronouncements113. Revenue Recognition114. Earnings Per Common Share135. Acquisitions136. Goodwill and Intangible Assets, Net147. Debt168. Leases179. Shareholders’ Equity (Deficit)1810. Income Taxes1911. Segment Information2012. Subsequent Events22Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations23Item 3.Quantitative and Qualitative Disclosures About Market Risk40Item 4.Controls and Procedures41 Part II – Other Information Item 1.Legal ProceedingsItem 1A.Risk FactorsItem 2.Unregistered Sales of Equity Securities and Use of ProceedsItem 5.Other InformationItem 6.Exhibits AVAILABLE INFORMATION Our corporate headquarters is located at 7 World Trade Center, 250 Greenwich Street, 49th Floor, New York, New York, 10007, andour telephone number is (212) 804-3900. We maintain a website on the internet at www.msci.com. The contents of our website are not a part ofor incorporated by reference in this Quarterly Report on Form 10-Q. We file annual, quarterly and current reports, proxy statements and other information with the Securities and Exchange Commission(“SEC”). The SEC maintains a website that contains reports, proxy and information statements and other information that we file electronicallywith the SEC at www.sec.gov. We also make available free of charge, on or through our website, these reports, proxy statements and otherinformation as soon as reasonably practicable following the time they are electronically filed with or furnished to the SEC. To access these,click on the “SEC Filings” link under the “Financial Information” tab found on our investor relations homepage (https://ir.msci.com). We also use our investor relations website ir.msci.com and our social media outlets, such as LinkedIn or X (@MSCI_Inc), as channelsof distribution of Company information. The information we post through these channels may be deemed material. Accordingly, investors should monitor these channels, in addition to following our press releases, SEC filings and public conferencecalls and webcasts. In addition, you may automatically receive email alerts and other information about us when you enroll your email addressby visiting the “Email Alerts” on our investor relations homepage at https://ir.msci.com/email-alerts. The contents of our website, including ourinvestor relations website, and our social media channels are not, however, a part of or incorporated by reference in this Quarterly Report onForm 10