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Exhibit 8.1

PRINCIPAL SUBSIDIARIES OF NEBIUS GROUP N.V.

Name of Subsidiary(1)

Jurisdiction of Organization

NEBIUS B.V.

Netherlands

AVRIDE B.V.

Netherlands

TOLOKA AI INC.

U.S.

TRIPLETEN INC.

U.S.

NEBIUS ISRAEL LTD.

Israel

TOLOKA AI B.V.

Netherlands

EDTECH PLUS B.V.

Netherlands


(1) Directly or indirectly held