Form 10-K/A NOVAVAX INC For: Dec 31

Exhibit 31.3

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Stanley C. Erck, certify that:

1. I have reviewed this Amendment No. 1 to Annual Report on Form 10-K/A of Novavax, Inc.; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

Exhibit 31.4

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

I, John J. Trizzino, certify that:

1. I have reviewed this Amendment No. 1 to Annual Report on Form 10-K/A of Novavax, Inc.; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

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