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<title>SEC FORM 
            4</title>
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<body>SEC Form 4 
   <table width="100%" border="0" cellspacing="0" cellpadding="4">
<tr>
<td width="20%" colspan="2" valign="top" align="center" class="FormName">FORM 4</td>
<td rowspan="2" width="60%" valign="middle" align="center">
<span class="FormTitle">UNITED STATES SECURITIES AND EXCHANGE COMMISSION</span><br><span class="MedSmallFormText">Washington, D.C. 20549</span><br><br><span class="FormTitle">STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP</span><br><br><span class="MedSmallFormText">Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934</span><br><span class="MedSmallFormText">or Section 30(h) of the Investment Company Act of 1940</span>
</td>
<td rowspan="2" width="20%" valign="top" align="center"><table width="100%" border="1" summary="OMB Approval Status Box">
<tr><td class="FormTextC">OMB APPROVAL</td></tr>
<tr><td><table width="100%" border="0" summary="OMB Interior Box">
<tr>
<td class="SmallFormText" colspan="3">OMB Number:</td>
<td class="SmallFormTextR">3235-0287</td>
</tr>
<tr><td class="SmallFormText" colspan="4">Estimated average burden</td></tr>
<tr>
<td class="SmallFormText" colspan="3">hours per response:</td>
<td class="SmallFormTextR">0.5</td>
</tr>
</table></td></tr>
</table></td>
</tr>
<tr valign="middle">
<td><table width="100%" border="1" cellpadding="0" cellspacing="0"><tr><td>  </td></tr></table></td>
<td class="SmallFormText">Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. 
         <i>See</i>

         Instruction 1(b).</td>
</tr>
</table>
<table width="100%" border="1" cellspacing="0" cellpadding="4">
<tr>
<td rowspan="3" width="35%" valign="top">
<span class="MedSmallFormText">1. Name and Address of Reporting Person<sup>*</sup></span><table border="0" width="100%"><tr><td><a href="/cgi-bin/browse-edgar?action=getcompany&amp;CIK=0001342823">Glenn Gregory M</a></td></tr></table>
<hr width="98%">
<table border="0" width="100%"><tr>
<td width="33%" class="MedSmallFormText">(Last)</td>
<td width="33%" class="MedSmallFormText">(First)</td>
<td width="33%" class="MedSmallFormText">(Middle)</td>
</tr></table>
<table border="0" width="100%">
<tr><td><span class="FormData">C/O NOVAVAX, INC.</span></td></tr>
<tr><td><span class="FormData">21 FIRSTFIELD ROAD</span></td></tr>
</table>
<hr width="98%">
<span class="MedSmallFormText">(Street)</span><table border="0" width="100%"><tr>
<td width="33%"><span class="FormData">GAITHERSBURG</span></td>
<td width="33%"><span class="FormData">MD</span></td>
<td width="33%"><span class="FormData">20878</span></td>
</tr></table>
<hr width="98%">
<table border="0" width="100%"><tr>
<td width="33%" class="MedSmallFormText">(City)</td>
<td width="33%" class="MedSmallFormText">(State)</td>
<td width="33%" class="MedSmallFormText">(Zip)</td>
</tr></table>
</td>
<td width="35%" valign="top">
<span class="MedSmallFormText">2. Issuer Name <b>and</b> Ticker or Trading Symbol
      </span><br><a href="/cgi-bin/browse-edgar?action=getcompany&amp;CIK=0001000694">NOVAVAX INC</a>
     [ <span class="FormData">NVAX</span> ]
   </td>
<td rowspan="2" valign="top">
<span class="MedSmallFormText">5. Relationship of Reporting Person(s) to Issuer
      </span><br><span class="MedSmallFormText">(Check all applicable)</span><table border="0" width="100%">
<tr>
<td width="15%" align="center"></td>
<td width="35%" class="MedSmallFormText">Director</td>
<td width="15%" align="center"></td>
<td width="35%" class="MedSmallFormText">10% Owner</td>
</tr>
<tr>
<td align="center"><span class="FormData">X</span></td>
<td class="MedSmallFormText">Officer (give title below)</td>
<td align="center"></td>
<td class="MedSmallFormText">Other (specify below)</td>
</tr>
<tr>
<td width="15%" align="center"></td>
<td width="35%" align="left" style="color: blue">President, R&amp;D</td>
<td width="15%" align="center"></td>
<td width="35%" align="left" style="color: blue"></td>
</tr>
</table>
</td>
</tr>
<tr><td valign="top">
<span class="MedSmallFormText">3. Date of Earliest Transaction
         (Month/Day/Year)</span><br><span class="FormData">09/29/2021</span>
</td></tr>
<tr>
<td valign="top">
<span class="MedSmallFormText">4. If Amendment, Date of Original Filed
         (Month/Day/Year)</span><br>
</td>
<td valign="top">
<span class="MedSmallFormText">6. Individual or Joint/Group Filing (Check Applicable Line)
      </span><table border="0" width="100%">
<tr>
<td width="15%" align="center"><span class="FormData">X</span></td>
<td width="85%" class="MedSmallFormText">Form filed by One Reporting Person</td>
</tr>
<tr>
<td width="15%" align="center"></td>
<td width="85%" class="MedSmallFormText">Form filed by More than One Reporting Person</td>
</tr>
</table>
</td>
</tr>
</table>
<table width="100%" border="1" cellspacing="0" cellpadding="4">
<thead>
<tr><th width="100%" valign="top" colspan="11" align="center" class="FormTextC"><b>Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned</b></th></tr>
<tr>
<th width="36%" valign="top" rowspan="2" align="left" class="MedSmallFormText">1. Title of Security (Instr. 
      3)
   </th>
<th width="6%" valign="top" rowspan="2" align="left" class="SmallFormText">2. Transaction Date
      (Month/Day/Year)</th>
<th width="5%" valign="top" rowspan="2" align="left" class="SmallFormText">2A. Deemed Execution Date, if any
      (Month/Day/Year)</th>
<th width="7%" valign="top" colspan="2" align="left" class="SmallFormText">3. Transaction Code (Instr. 
      8)
   </th>
<th width="19%" valign="top" colspan="3" align="left" class="SmallFormText">4. Securities Acquired (A) or Disposed Of (D) (Instr. 
      3, 4 and 5)
   </th>
<th width="11%" valign="top" rowspan="2" align="left" class="SmallFormText">5. 
      Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 
      3 and 4)
   </th>
<th width="9%" valign="top" rowspan="2" align="left" class="SmallFormText">6. Ownership Form: Direct (D) or Indirect (I) (Instr. 
      4)
   </th>
<th width="8%" valign="top" rowspan="2" align="left" class="SmallFormText">7. Nature of Indirect Beneficial Ownership (Instr. 
      4)
   </th>
</tr>
<tr>
<th width="4%" align="center" class="SmallFormText">Code</th>
<th width="3%" align="center" class="SmallFormText">V</th>
<th width="8%" align="center" class="SmallFormText">Amount</th>
<th width="5%" align="center" class="SmallFormText">(A) or (D)</th>
<th width="6%" align="center" class="SmallFormText">Price</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">M</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">2,083</span></td>
<td align="center"><span class="FormData">A</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">5.95</span>
</td>
<td align="center"><span class="FormData">6,144</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">57</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">228.12</span>
</td>
<td align="center"><span class="FormData">6,087</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">225</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">229.9924</span><span class="FootnoteData"><sup>(2)</sup></span>
</td>
<td align="center"><span class="FormData">5,862</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">272</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">231.0668</span><span class="FootnoteData"><sup>(3)</sup></span>
</td>
<td align="center"><span class="FormData">5,590</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">318</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">231.9969</span><span class="FootnoteData"><sup>(4)</sup></span>
</td>
<td align="center"><span class="FormData">5,272</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">262</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">233.2368</span><span class="FootnoteData"><sup>(5)</sup></span>
</td>
<td align="center"><span class="FormData">5,010</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">217</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">233.8694</span><span class="FootnoteData"><sup>(6)</sup></span>
</td>
<td align="center"><span class="FormData">4,793</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">203</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">235.1024</span><span class="FootnoteData"><sup>(7)</sup></span>
</td>
<td align="center"><span class="FormData">4,590</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">98</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">236.295</span><span class="FootnoteData"><sup>(8)</sup></span>
</td>
<td align="center"><span class="FormData">4,492</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">57</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">237.29</span>
</td>
<td align="center"><span class="FormData">4,435</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">124</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">239.041</span><span class="FootnoteData"><sup>(9)</sup></span>
</td>
<td align="center"><span class="FormData">4,311</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">99</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">240.3657</span><span class="FootnoteData"><sup>(10)</sup></span>
</td>
<td align="center"><span class="FormData">4,212</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">56</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">243.9805</span><span class="FootnoteData"><sup>(11)</sup></span>
</td>
<td align="center"><span class="FormData">4,156</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">S</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">95</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">248.134</span><span class="FootnoteData"><sup>(12)</sup></span>
</td>
<td align="center"><span class="FormData">4,061</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">M</span><span class="FootnoteData"><sup>(1)</sup></span><span class="FootnoteData"><sup>(13)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">1,377</span></td>
<td align="center"><span class="FormData">A</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">5.95</span>
</td>
<td align="center"><span class="FormData">5,438</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">D</span><span class="FootnoteData"><sup>(1)</sup></span><span class="FootnoteData"><sup>(13)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">36</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">231.04</span>
</td>
<td align="center"><span class="FormData">5,402</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="FormData">Common Stock</span></td>
<td align="center"><span class="FormData">09/27/2021</span></td>
<td align="center"><span class="FormData"></span></td>
<td align="center">
<span class="SmallFormData">F</span><span class="FootnoteData"><sup>(1)</sup></span><span class="FootnoteData"><sup>(13)</sup></span>
</td>
<td align="center"></td>
<td align="center"><span class="FormData">648</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="center">
<span class="FormText">$</span><span class="FormData">231.04</span>
</td>
<td align="center"><span class="FormData">4,754</span></td>
<td align="center"><span class="FormData">D</span></td>
<td align="left"></td>
</tr>
</tbody>
</table>
<table width="100%" border="1" cellspacing="0" cellpadding="4">
<thead>
<tr><th width="100%" valign="top" colspan="16" align="center" class="FormTextC">
<b>Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned</b><br><b>(e.g., puts, calls, warrants, options, convertible securities)</b>
</th></tr>
<tr>
<th width="13%" valign="top" rowspan="2" align="left" class="SmallFormText">1. Title of Derivative Security (Instr. 
      3)
   </th>
<th width="5%" valign="top" rowspan="2" align="left" class="SmallFormText">2. Conversion or Exercise Price of Derivative Security
   </th>
<th width="5%" valign="top" rowspan="2" align="left" class="SmallFormText">3. Transaction Date
      (Month/Day/Year)</th>
<th width="5%" valign="top" rowspan="2" align="left" class="SmallFormText">3A. Deemed Execution Date, if any
      (Month/Day/Year)</th>
<th width="9%" valign="top" colspan="2" align="left" class="SmallFormText">4. Transaction Code (Instr. 
      8)
   </th>
<th width="10%" valign="top" colspan="2" align="left" class="SmallFormText">5. 
      Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 
      3, 4 and 5)
   </th>
<th width="9%" valign="top" colspan="2" align="left" class="SmallFormText">6. Date Exercisable and Expiration Date 
      (Month/Day/Year)</th>
<th width="17%" valign="top" colspan="2" align="left" class="SmallFormText">7. Title and Amount of Securities Underlying Derivative Security (Instr. 
      3 and 4)
   </th>
<th width="6%" valign="top" rowspan="2" align="left" class="SmallFormText">8. Price of Derivative Security (Instr. 
      5)
   </th>
<th width="6%" valign="top" rowspan="2" align="left" class="SmallFormText">9. 
      Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 
      4)
   </th>
<th width="6%" valign="top" rowspan="2" align="left" class="SmallFormText">10. Ownership Form: Direct (D) or Indirect (I) (Instr. 
      4)
   </th>
<th width="7%" valign="top" rowspan="2" align="left" class="SmallFormText">11. Nature of Indirect Beneficial Ownership (Instr. 
      4)
   </th>
</tr>
<tr>
<th width="4%" valign="bottom" align="center" class="SmallFormText">Code</th>
<th width="4%" valign="bottom" align="center" class="SmallFormText">V</th>
<th width="5%" valign="bottom" align="center" class="SmallFormText">(A)</th>
<th width="5%" valign="bottom" align="center" class="SmallFormText">(D)</th>
<th width="5%" valign="bottom" align="center" class="SmallFormText">Date Exercisable</th>
<th width="4%" valign="bottom" align="center" class="SmallFormText">Expiration Date</th>
<th width="10%" valign="bottom" align="center" class="SmallFormText">Title</th>
<th width="7%" valign="bottom" align="center" class="SmallFormText">Amount or Number of Shares</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left"><span class="SmallFormData">Stock Option (Right to Buy)</span></td>
<td align="center">
<span class="SmallFormText">$</span><span class="SmallFormData">5.95</span>
</td>
<td align="center"><span class="SmallFormData">09/27/2021</span></td>
<td align="center"><span class="SmallFormData"></span></td>
<td align="center">
<span class="SmallFormData">M</span><span class="FootnoteData"><sup>(1)</sup></span>
</td>
<td align="center"></td>
<td align="center"></td>
<td align="center"><span class="SmallFormData">2,083</span></td>
<td align="center">
<span class="SmallFormData">
                
            </span><span class="FootnoteData"><sup>(14)</sup></span>
</td>
<td align="center"><span class="SmallFormData">09/26/2029</span></td>
<td align="center"><span class="SmallFormData">Common Stock</span></td>
<td align="center"><span class="FormData">2,083</span></td>
<td align="center">
<span class="SmallFormText">$</span><span class="SmallFormData">0.00</span>
</td>
<td align="center"><span class="SmallFormData">50,001</span></td>
<td align="center"><span class="SmallFormData">D</span></td>
<td align="left"></td>
</tr>
<tr>
<td align="left"><span class="SmallFormData">Stock Appreciation Right</span></td>
<td align="center">
<span class="SmallFormText">$</span><span class="SmallFormData">5.95</span>
</td>
<td align="center"><span class="SmallFormData">09/27/2021</span></td>
<td align="center"><span class="SmallFormData"></span></td>
<td align="center">
<span class="SmallFormData">M</span><span class="FootnoteData"><sup>(1)</sup></span><span class="FootnoteData"><sup>(13)</sup></span>
</td>
<td align="center"></td>
<td align="center"></td>
<td align="center"><span class="SmallFormData">1,377</span></td>
<td align="center">
<span class="SmallFormData">
                
            </span><span class="FootnoteData"><sup>(15)</sup></span>
</td>
<td align="center"><span class="SmallFormData">09/26/2029</span></td>
<td align="center"><span class="SmallFormData">Common Stock</span></td>
<td align="center"><span class="FormData">1,377</span></td>
<td align="center">
<span class="SmallFormText">$</span><span class="SmallFormData">0.00</span>
</td>
<td align="center"><span class="SmallFormData">33,051</span></td>
<td align="center"><span class="SmallFormData">D</span></td>
<td align="left"></td>
</tr>
</tbody>
</table>
<table border="0" width="100%">
<tr><td class="MedSmallFormText"><b>Explanation of Responses:</b></td></tr>
<tr><td class="FootnoteData">1. The transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.</td></tr>
<tr><td class="FootnoteData">2. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $229.40 to $230.28, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">3. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $230.58 to $231.37, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">4. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $231.63 to $232.46, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">5. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $232.64 to $233.59, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">6. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $233.76 to $234.08, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">7. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $234.82 to $235.38, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">8. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $235.85 to $236.74, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">9. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $238.57 to $239.16, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">10. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $240.30 to $240.43, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">11. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $243.96 to $243.99, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">12. The reported price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $247.99 to $248.55, inclusive. The reporting person undertakes to provide to Novavax, Inc., any security holder of Novavax, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.</td></tr>
<tr><td class="FootnoteData">13. The reporting person received 693 shares of common stock upon the net exercise of 1,377 stock appreciation rights under the Novavax, Inc. Amended and Restated 2015 Stock Incentive Plan, as amended (the "Plan"). The reporting person forfeited 36 shares of common stock underlying the stock appreciation rights representing the base value and 648 shares of common stock underlying the stock appreciation rights to satisfy the withholding tax obligations resulting from the exercise, using the closing stock price on September 27, 2021 of $231.04.</td></tr>
<tr><td class="FootnoteData">14. Twenty-five percent (25%) of the shares subject to this option grant under the Plan vested on the first anniversary of the September 26, 2019 grant date, and the remaining seventy-five percent (75%) of the shares vested or will vest in equal monthly installments over the following three (3) years subject to continued employment through such vesting date.</td></tr>
<tr><td class="FootnoteData">15. Twenty-five percent (25%) of the shares subject to this stock appreciation right grant under the Plan vested on the first anniversary of the September 26, 2019 grant date, and the remaining seventy-five percent (75%) of the shares vested or will vest in equal monthly installments over the following three (3) years subject to continued employment through such vesting date.</td></tr>
<tr><td class="FormText"><b>Remarks:</b></td></tr>
<tr><td class="FootnoteData"></td></tr>
</table>
<table width="100%" border="0">
<tr>
<td width="60%"></td>
<td width="20%"><u><span class="FormData">/s/ John A. Herrmann III, Attorney-in-Fact</span></u></td>
<td width="20%"><u><span class="FormData">09/29/2021</span></u></td>
</tr>
<tr>
<td></td>
<td class="MedSmallFormText">** Signature of Reporting Person</td>
<td class="MedSmallFormText">Date</td>
</tr>
<tr><td colspan="3" class="MedSmallFormText">Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.</td></tr>
<tr><td colspan="3" class="MedSmallFormText">* If the form is filed by more than one reporting person, 
                  <i>see</i>

                  Instruction 
                  4

                  (b)(v).</td></tr>
<tr><td colspan="3" class="MedSmallFormText">** Intentional misstatements or omissions of facts constitute Federal Criminal Violations 
                  <i>See</i>

                  18 U.S.C. 1001 and 15 U.S.C. 78ff(a).</td></tr>
<tr><td colspan="3" class="MedSmallFormText">Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, 
                  <i>see</i>

                  Instruction 6 for procedure.</td></tr>
<tr><td colspan="3" class="MedSmallFormText"><b>Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.</b></td></tr>
</table>
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