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Exhibit 21.1

Subsidiaries of MSCI Inc.

The following is a list of the subsidiaries of MSCI Inc., excluding those subsidiaries that, considered in the aggregate as a single subsidiary, do not constitute a significant subsidiary as of December 31, 2025.

NameJurisdiction of Incorporation/Organization
Barra, LLCDelaware, U.S.A.
Investment Property Databank LimitedUnited Kingdom
MSCI Barra (Suisse) SàrlSwitzerland
MSCI G.K.Japan
MSCI LimitedUnited Kingdom
MSCI Solutions (UK) LimitedUnited Kingdom
MSCI Solutions LLCDelaware, U.S.A.
Real Capital Analytics, Inc.New York, U.S.A.
RiskMetrics Solutions, LLCDelaware, U.S.A.
The Burgiss Group, LLCNew Jersey, U.S.A.