Document:

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: capitalize; text-align: right">Exhibit 10.13</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">FIRST AMENDMENT
TO SUBLEASE</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in; color: #0F0F0F">This First
Amendment to Sublease (&#8220;<B><I>First Amendment</I></B>&#8221;) is entered into as of the 9th day of September, 2019, by and between
<B>NOVAVAX, INC., </B>a Delaware corporation (&#8220;<B><I>Sublandlord</I></B>&#8221;), and MAXCYTE, INC., a Delaware corporation (&#8220;<B><I>Subtenant</I></B>&#8221;).</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; color: #0F0F0F"><B><U>WITNESSETH</U>:</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in; color: #0F0F0F"><B>WHEREAS</B>,
Sublandlord and Subtenant entered into a Sublease dated as of April 11, 2017 (the &#8220;<B><I>Sublease</I></B>&#8221;), whereby Subtenant
leases from Sublandlord certain premises containing approximately 5,743 rentable square feet of space, known as Suite 180 (the &#8220;<B><I>Subleased
Premises</I></B>&#8221;), on the first (1<SUP>st</SUP>) floor of the building located at 22 Firstfield Road, Gaithersburg, Maryland 20878
(the &#8220;<B><I>Building</I></B>&#8221;), for a Sublease Term which is currently scheduled to expire on January 31, 2020 (the &#8220;<B><I>Current
Sublease Term</I></B>&#8221;); and</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in; color: #0F0F0F"><B>WHEREAS</B>,
Sublandlord and Subtenant wish to amend the Sublease so as to extend the Sublease Term, and to make certain additional modifications to
the terms of the Sublease as set forth herein.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in; color: #0F0F0F"><B>NOW, THEREFORE</B>,
in consideration of the covenants hereinafter set forth, and of other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto agree as follows:</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">1.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><U>Recitals: Defined Terms</U>. The foregoing recitals are incorporated herein by this reference. Capitalized terms used and not
defined herein shall have the meanings set forth in the Sublease, as amended hereby.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">2.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Sublease Term</U>. Notwithstanding any provision of the Sublease to the contrary, Sublandlord and
Subtenant hereby acknowledge and agree that the Sublease Term shall be extended beyond the Current Sublease Term. The &#8220;Extension
Sublease Term&#8221; shall commence on February 1, 2020 (the &#8220;<B><I>Extension Sublease Term Commencement Date</I></B>&#8221;) and
shall expire on October 30, 2023 (the &#8220;<B><I>Extension Sublease Term Expiration Date</I></B>&#8221;). Subtenant shall have no right
to further extend the Sublease Term beyond the Extension Sublease Term Expiration Date, unless mutually agreed to in writing by Sublandlord
and Subtenant and consented to by Landlord (as such term &#8220;<B><I>Landlord</I></B>&#8221; is used and defined in the Sublease).</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">3.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Subleased Premises</U>. Subtenant acknowledges that Subtenant is currently in possession of the
Subleased Premises and Subtenant agrees to accept the Subleased Premises in its &#8220;as is&#8221; condition for the remainder of the
Current Sublease Term and the duration of the Extension Sublease Term.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">4.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Early Termination Option</U>. Section 3 of the Sublease is amended by adding the following paragraph
at the end thereof:</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-align: justify; text-indent: 0in; color: #0F0F0F">Notwithstanding
anything provided in the Sublease (as amended) to the contrary, commencing at any time from and after February 1, 2021, either
Sublandlord or Subtenant, as the case may be, may elect to terminate the Sublease (other than those provisions which are expressly
stated to survive termination) upon delivering to the other party to the Sublease at least twelve (12) months&#8217; prior written
notice of termination, provided that if it is Subtenant that elects to terminate, Subtenant shall, simultaneously with its notice of
termination, pay to Sublandlord a termination fee in an amount equal to the unamortized cost of the brokerage fees (amortized on a
straight line basis) paid by Sublandlord to Jones Lang LaSalle Brokerage, Inc. and Edge Commercial Real Estate in connection with
the Sublease and this First Amendment.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">5.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Base Rent</U>. Subtenant shall continue to pay Base Rent to Sublandlord for the remainder of the
Current Sublease Term in the amounts and upon the terms and conditions set forth in the Sublease. Throughout the Extension Sublease Term,
Subtenant shall pay Base Rent to Sublandlord in the amounts set forth in the schedule below, and otherwise upon the terms and conditions
set forth in the Sublease:</FONT></P>

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<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 75%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid; font-size: 10pt; color: #0F0F0F; text-align: center">Time Period</TD><TD STYLE="font-size: 10pt; color: #0F0F0F">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; color: #0F0F0F; text-align: center">Per Square Foot<BR> Rate</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; color: #0F0F0F">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font-size: 10pt; color: #0F0F0F; text-align: center">Annualized Base<BR> Rent</TD><TD STYLE="font-size: 10pt; color: #0F0F0F">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font-size: 10pt; color: #0F0F0F; text-align: center">Monthly Base<BR> Rent</TD><TD STYLE="font-size: 10pt; color: #0F0F0F">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 27%; font-size: 10pt; color: #0F0F0F; text-align: center"><FONT STYLE="color: #0F0F0F">2/1/20 - 1/31/21</FONT></TD><TD STYLE="width: 1%; font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="width: 1%; font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="width: 10%; font-size: 10pt; color: #0F0F0F; text-align: right">26.96</TD><TD STYLE="width: 1%; font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="width: 1%; font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="width: 10%; font-size: 10pt; color: #0F0F0F; text-align: right">154,831.28</TD><TD STYLE="width: 1%; font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="width: 1%; font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="width: 10%; font-size: 10pt; color: #0F0F0F; text-align: right">12,902.61</TD><TD STYLE="width: 1%; font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: center"><FONT STYLE="color: #0F0F0F">2/1/21 - 1/31/22</FONT></TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">27.76</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">159,425.68</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">13,285.47</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: center"><FONT STYLE="color: #0F0F0F">2/1/22 - 1/31/23</FONT></TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">28.60</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">164,249.80</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">13,687.48</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: center"><FONT STYLE="color: #0F0F0F">2/1/23 - 10/31/23</FONT></TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">29.46</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">169,188.78</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">$</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: right">14,099.07</TD><TD STYLE="font-size: 10pt; color: #0F0F0F; text-align: left">&nbsp;</TD></TR>
  </TABLE>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">6.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Brokerage Fees</U>. The parties hereto represent and warrant to each other that they have not dealt
with any broker other than Jones Lang LaSalle Brokerage, Inc. and Edge Commercial Real Estate. Sublandlord shall pay said brokers a brokerage
commission pursuant to separate agreements between Sublandlord and said brokers in connection with this First Amendment. Each party hereto
agrees to indemnify, defend and hold the other party harmless against any claim or liability for a commission by any broker, arising by
reason of a breach by the indemnifying party of the aforesaid representation and warranty.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">7.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Assignment and Sublease</U>. Section 17 of the Sublease is hereby amended by adding the following:
Other than an assignment to an Affiliate of Subtenant, Subtenant shall split profits, if any, of any sublease, transfer or assignment,
fifty-fifty (50/50) with Sublandlord.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">8.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Representations</U></FONT><FONT STYLE="color: #343434">. </FONT><FONT STYLE="color: #0F0F0F">Sublandlord
and Subtenant hereby acknowledge that the Sublease is in full force and effect and Subtenant acknowledges that Sublandlord has met all
of its obligations under the Sublease and is not currently in default thereunder.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">9.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #0F0F0F"><U>Ratification</U>. Unless a term or condition of the Sublease is expressly contradicted by the terms
of this First Amendment or modified hereby, all terms and conditions of the Sublease shall remain in full force and effect and continue
to bind Sublandlord and Subtenant. In the event that a term of this First Amendment is fundamentally inconsistent with a term of the Sublease,
the terms of this First Amendment shall control. The terms of the Sublease, as modified hereby, are ratified and affirmed by the parties.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">10.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT> <FONT STYLE="color: #111111"><U>Authority</U>. The person executing this First Amendment on behalf of Subtenant represents and
warrants to Sublandlord that Subtenant has full right and authority to enter into this First Amendment and that he is fully authorized
to execute the same on its behalf. The person executing this First Amendment on behalf of Sublandlord represents and warrants to Subtenant
that Sublandlord has full right and authority to enter into this First Amendment and that he is fully authorized to execute the same on
its behalf.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">11.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #111111"><U>Entire Agreement</U>. This First Amendment constitutes the entire agreement of the parties with
respect to the subject matter addressed herein. No terms, conditions, representations, warranties, promises, or understandings, of any
nature whatsoever, express or implied, have been made or relied upon by any party hereto. This First Amendment may not be modified, waived,
discharged or terminated other than by a writing executed by the parties hereto.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">12.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #111111"><U>Binding Effect</U>. The terms of this First Amendment shall be binding upon the parties hereto
and their respective successors and assigns.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">13.<FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</FONT><FONT STYLE="color: #111111"><U>Consent of Landlord</U>. This First Amendment is expressly contingent upon Landlord&#8217;s consent
hereto</FONT><FONT STYLE="color: #2B2B2B">.</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; color: #111111">[<B>Signature
Page Follows</B>]</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in; color: #383638"><B>IN WITNESS
WHEREOF, </B>the parties hereto have executed this First Amendment as of the date first set forth above.</P>

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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>WITNESS:</B></FONT></TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SUBLANDLORD:</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Novavax, Inc</B>.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">a Delaware corporation</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Jonathan Wallinger</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ John A. Herrmann III </FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(SEAL)</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name: Jonathan Wallinger</FONT></TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name: John A. Herrmann III</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Title: SVP, General Counsel</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date: 11 September 2019</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>WITNESS:</B></FONT></TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SUBTENANT:</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>MaxCyte, Inc.</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">a Delaware corporation</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; width: 49%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Maher Masoud</FONT></TD>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 45%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Ron Holtz </FONT></TD>
    <TD STYLE="width: 3%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(SEAL)</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name: Maher Masoud</FONT></TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name: Ron Holtz</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Title: Chief Financial Officer</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date: 10 September 2019</FONT></TD></TR>
  </TABLE>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>EX-4.1

 Exhibit 4.1 
  

					
		  	 NUMBER UNITS

U-
	  	
	SEE REVERSE FOR CERTAIN 
DEFINITIONS	  	 CUSIP
	  	

 BLUE WHALE ACQUISITION CORP I 

UNITS CONSISTING OF ONE CLASS A ORDINARY SHARE AND ONE-FOURTH OF ONE 

REDEEMABLE WARRANT, EACH WHOLE WARRANT ENTITLING THE HOLDER TO 

PURCHASE ONE CLASS A ORDINARY SHARE 
 THIS
CERTIFIES THAT                     is the owner
of                    Units. 
 Each Unit
(“Unit”) consists of one (1) Class A Ordinary Share, par value $0.0001 per share (“Class A Ordinary Shares”), of Blue Whale Acquisition Corp I, a Cayman
Islands exempted company (the “Company”), and one-fourth (1/4) of one redeemable warrant (the “Warrant”). Each whole Warrant entitles the holder to purchase one
(1) Class A Ordinary Share (subject to adjustment) for $11.50 per share (subject to adjustment). Only whole Warrants are exercisable. Each Warrant will become exercisable thirty (30) days after the Company’s completion of a
merger, share exchange, asset acquisition, share purchase, reorganization or other similar business combination with one or more businesses (each a “Business Combination”) and will expire, unless exercised before 5:00 p.m.,
New York City Time, on the date that is five (5) years after the date on which the Company completes its initial Business Combination, or earlier upon redemption or liquidation. The Class A Ordinary Shares and Warrants comprising the Units
represented by this certificate will begin separate trading on                 , 2021 unless Goldman Sachs & Co. LLC and BofA Securities, Inc. elect to allow
separate trading earlier, subject to the Company’s filing of a Current Report on Form 8-K with the Securities and Exchange Commission containing an audited balance sheet reflecting the Company’s
receipt of the gross proceeds of its initial public offering (the “Audit 8-K”) and, if the separation date is earlier than trading on
                , 2021, issuing a press release announcing when separate trading will begin. The Company shall file the Audit
8-K. No fractional Warrants will be issued upon separation of the Units. The terms of the Warrants are governed by a Warrant Agreement, dated as of
                , 2021, between the Company and Continental Stock Transfer & Trust Company, as Warrant Agent, and are subject to the terms and provisions
contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. Copies of the Warrant Agreement are on file at the office of the Warrant Agent at One State Street, 30th Floor, New York, New York
10004, and are available to any Warrant holder on written request and without cost. 
 Upon the consummation of the Business Combination,
the Units represented by this certificate will automatically separate into the Class A Ordinary Shares and Warrants comprising such Units. 

This certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar of the Company. 

This certificate shall be governed by and construed in accordance with the laws of the State of New York. 

Witness the facsimile signature of its duly authorized officers. 
  

			
	  
 [TITLE]
	  	  
 [TITLE]

 BLUE WHALE ACQUISITION CORP The Company will furnish without charge to each unitholder who
so requests, a statement of the powers, designations, preferences and relative, participating, optional or other special rights of each class of shares or series thereof of the Company and the qualifications, limitations, or restrictions of such
preferences and/or rights. 
 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed
as though they were written out in full according to applicable laws or regulations: 
  

							
	TEN COM	  	—as tenants in common	  	UNIFI GIFT MIN ACT —	  	                    Custodian

                    
				
	TEN ENT	  	—as tenants by the entireties	  		  	 (Cust) 
(Minor) 
under Uniform Gifts to

Minors

				
	JT TEN	  	 —as joint tenants with right

    of survivorship and not as

    tenants in common
	  		  	 Act
                    
 (State)

 Additional abbreviations may also be used though not in the above list. 

For value received,
                         hereby sell, assign and transfer unto
                         
  

	
	 PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

 

	 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

 

	 
	 
	              Units
represented by the within Certificate, and does hereby irrevocably constitute and appoint

	
	
                          
   Attorney to transfer the said Units on the register of members of the within named Company with full power of substitution in the premises.
  

	 Dated:
                    

 

							
		 		 		 	
		 	 Notice:
	 	 The signature to this assignment

must correspond with the name as
 written upon the face of
the
	 	 

  
 2 

							
		  	 	 	 certificate in every particular,

without alteration or enlargement or
 any change
whatever.
	 	

			
	 Signature(s) Guaranteed:

 

	 THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED).
	  	

 In each case, as more fully described in the Company’s final prospectus dated
                , 2021, the holder(s) of this certificate shall be entitled to receive a pro rata portion of certain funds held in the trust account established in
connection with its initial public offering only in the event that (i) the Company redeems the Class A Ordinary Shares sold in its initial public offering and liquidates because it does not consummate an initial business combination by
                , 2023, or by such later date approved by the Company’s shareholders in accordance with the Company’s amended and restated memorandum and
articles of association, (ii) the Company redeems the Class A Ordinary Shares sold in its initial public offering in connection with a shareholder vote to amend the Company’s amended and restated memorandum and articles of association
(A) to modify the substance or timing of the Company’s obligation to allow redemption in connection with the Company’s initial business combination or to redeem 100% of the Class A Ordinary Shares if it does not complete its
initial business combination by                 , 2023, or by such later date approved by the Company’s shareholders in accordance with the Company’s amended
and restated memorandum and articles of association, or (B) with respect to any other provision relating to the holder(s)’(s) rights or pre-initial business combination activity, or (iii) if the
holder(s) seek(s) to redeem for cash his, her, its or their respective Class A Ordinary Shares in connection with a tender offer (or proxy solicitation, solely in the event the Company seeks shareholder approval of the proposed initial business
combination) setting forth the details of a proposed initial business combination. In no other circumstances shall the holder(s) have any right or interest of any kind to or in the trust account. 

  
 3

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