SEC Contract Filing

Filing Date: 2025-06-05

Document Content:
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<TYPE>EX-10.1
<SEQUENCE>2
<FILENAME>ea024405101ex10-1_constell1.htm
<DESCRIPTION>AMENDMENT TO THE PROMISSORY NOTE, DATED JUNE 5, 2025, BETWEEN CONSTELLATION ACQUISITION CORP I AND CONSTELLATION SPONSOR LP
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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right; margin: 0pt 0"><B>Exhibit 10.1</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FIRST AMENDMENT TO PROMISSORY NOTE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">THIS FIRST AMENDMENT TO THE PROMISSORY NOTE (this &ldquo;<B>Amendment</B>&rdquo;)
is dated as of the 5th day of June, 2025 and is made by and between Constellation Acquisition Corp I, a Cayman Islands exempted
company (the &ldquo;<B>Maker</B>&rdquo;), and Constellation Sponsor LP, a Delaware limited partnership, or its registered assigns or successors
in interest (the &ldquo;<B>Payee</B>&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">RECITALS</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">A. Maker executed that certain Promissory Note dated January 30, 2024,
in the original principal amount of up to $1,660,000 (the &ldquo;<B>Note</B>&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">B. Maker and Payee have agreed to amend the Note.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">C. Unless otherwise set forth herein, all other provisions of the Note
shall remain in full force and effect.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">E. All capitalized terms not defined in this Amendment will have the
meanings given to them in the Note.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">In consideration of these promises, the mutual covenants contained
in this Amendment and other good and valuable consideration, the receipt and sufficiency of which are acknowledged, the parties agree
as follows:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">1. The Total Principal Amount of the Note is increased by $590,000
from $1,660,000 to $2,250,000.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-align: justify; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">2. Section 3 of the Note is hereby amended and
restated in its entirety to read as follows:</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.25in">&ldquo;3. <U>Drawdown Requests</U>.
Maker and Payee agree that, in addition to the Initial Principal Amount, Maker may request an additional aggregate amount of up to (i)
$605,000, which may be drawn down in eleven (11) equal tranches subject to a request from Maker and (ii) $1,590,000, which may be drawn
down from time to time until the Maker consummates a Business Combination (each a &ldquo;<B>Drawdown Request</B>&rdquo;). Payee shall
fund each Drawdown Request no later than three (3) business days after receipt of a Drawdown Request. Once an amount is drawn down under
this Note, it shall not be available for future Drawdown Requests even if prepaid. No fees, payments or other amounts shall be due to
Payee in connection with, or as a result of, any Drawdown Request by the Maker.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-align: justify; text-indent: 0.25in">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; margin: 0pt 0; text-indent: 0.5in">IN WITNESS WHEREOF, the Maker
and Payee, intending to be legally bound hereby, have caused this Amendment to the Note to be duly executed as of the day and year first
above written.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
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 <TD>&nbsp;</TD>
 <TD COLSPAN="2"><B>Constellation Acquisition Corp I</B></TD></TR>
 <TR STYLE="vertical-align: top">
 <TD>&nbsp;</TD>
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