CONVERTIBLE NOTE

THIS NOTE AND THE SHARES OF COMMON STOCK OF NOVAVAX, INC. (OR OTHER SECURITIES) WHICH MAY BE ISSUABLE AS INTEREST ON OR UPON CONVERSION OF THIS NOTE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE SECURITIES ACT), OR THE SECURITIES LAWS OF ANY OF THE STATES OF THE UNITED STATES, AND MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL (I) SUCH SECURITIES HAVE BEEN REGISTERED UNDER THE SECURITIES ACT, OR (II) THE HOLDER HEREOF PROVIDES (A) A WRITTEN OPINION OF LEGAL COUNSEL, WHICH COUNSEL AND OPINION (IN FORM AND SUBSTANCE) SHALL BE REASONABLY SATISFACTORY TO NOVAVAX, INC., TO THE EFFECT THAT THE PROPOSED TRANSFER OF SUCH SECURITIES MAY BE EFFECTED WITHOUT REGISTRATION UNDER THE SECURITIES ACT, OR (B) A NO ACTION LETTER FROM THE SECURITIES AND EXCHANGE COMMISSION (THE COMMISSION) REASONABLY SATISFACTORY TO NOVAVAX, INC. TO THE EFFECT THAT UNDER THE SECURITIES ACT THE PROPOSED TRANSFER OF THE SECURITIES WITHOUT REGISTRATION WILL NOT RESULT IN A RECOMMENDATION BY THE STAFF OF THE COMMISSION THAT ACTION BE TAKEN WITH RESPECT THERETO, OR (C) SUCH OTHER EVIDENCE AS MAY BE REASONABLY SATISFACTORY TO NOVAVAX, INC. THAT THE PROPOSED TRANSFER OF SUCH SECURITIES MAY BE EFFECTED WITHOUT REGISTRATION UNDER THE SECURITIES ACT.

4% CONVERTIBLE SENIOR NOTE

     NOVAVAX, INC., a Delaware corporation (the Company), for value received, hereby promises to pay to the order of KING PHARMACEUTICALS, INC., a Tennessee corporation, or its registered assigns (Payee), the principal amount of Ten Million Dollars ($10,000,000), on December 19, 2007, with interest from the date hereof on the unpaid balance of such principal amount as provided herein, which interest is payable semi-annually on June 30 and December 31 of each year commencing June 30, 2002, and on the date such unpaid balance shall become due and payable in full (whether at maturity or at a date fixed for repurchase or by declaration or otherwise) (each an Interest Payment Date). Capitalized terms used and not defined in this Note shall have the meanings assigned to them in the Amended and Restated Investor Rights Agreement dated as of the date hereof, as amended, restated, supplemented or otherwise modified from time to time (the Amended and Restated Investor Rights Agreement), by and between the Company and Payee.

     Interest payable on this Note shall be computed on the basis of a 360-day year of twelve 30-day months and applied to the actual number of days elapsed and shall accrue at a fixed rate equal to four percent (4%) per annum. All payments with respect to this Note shall be credited first to the payment of accrued but unpaid interest and then to the repayment of principal. The rate of interest payable hereunder shall in no event exceed the maximum rate permitted by applicable law.

     Payments of principal on this Note shall be made in lawful money of the United States in immediately available funds at the address of Payee set forth below.

     Except as provided in the following sentence, payments of interest on this Note shall be made in lawful money of the United States in immediately available funds at the address of Payee set forth below. If the Average Closing Price calculated with respect to an Interest Payment Date is equal to or greater than the Conversion Price then in effect and no Event of Default shall have occurred and be continuing as of such Interest Payment Date, the Company, at its option, shall have the right to pay up to the full amount of the Stock Interest Portion of the interest due on such Interest Payment Date by issuing to Payee the number of fully paid and nonassessable shares of Common Stock which is determined by dividing such Stock Interest Portion by the Average Closing Price calculated with respect to such Interest Payment Date and by delivering a certificate or certificates for shares of such Common Stock in such denomination or denominations as Payee may request at the address specified by Payee. For purposes of the foregoing provision:
 

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