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Exhibit 21

LIST OF SUBSIDIARIES

The following is a list of subsidiaries of the Company as of December 31, 2023

Name of Subsidiary                 Jurisdiction of Incorporation or Organization

14 Firstfield Holdings, LLC                Delaware

Novavax NL B.V.             The Netherlands

Novavax DE GmbH                    Germany

Novavax AB                 Sweden

Novavax CZ (formerly Praha Vaccines a.s.)     The Czech Republic

Novavax UK Limited                     United Kingdom

Novavax CH GmbH             Switzerland

Novavax FR SAS                    France

Novavax ES S.L.U.                    Spain

Novavax IT S.r.L                    Italy