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Exhibit 21.1

List of Subsidiaries

Magnite Australia PTY Limited

Magnite Holdings Pty Ltd

Magnite CTV Pty Ltd

SpotX Australia Pty Ltd

Magnite Servicos De Internet Ltda

Magnite Canada, Inc.

The Rubicon Project Canada ULC

Magnite SARL

Magnite GmbH

Magnite Advertising Solutions India Private Limited

Magnite S.R.L.

Magnite K.K.

SpotX Japan G.K.

Magnite Netherlands B.V.

Magnite CTV (NZ) Limited

Magnite Singapore Pte Ltd.

Magnite Spain, S.L.

Magnite AB

Magnite Ltd

SpotX Limited

Magnite Apex, Inc.

Magnite Bell, Inc.

Rubicon Project Unlatch, Inc.

Magnite Hopper, Inc.

Project Daylight, LLC

Rubicon Project Daylight, Inc.