Company: CSTAF
Filing Date: 2025-06-05
Form Type: 8-K
Source: 0001213900-25-051595
Chunk: 0

Company: Constellation Acquisition Corp I
Filing Date: 2025-06-05
Form: 8-K
Item: Item 1.01
Chunk 0
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Item 1.01 Entry into a Material Definitive Agreement.

On January 29, 2024, Constellation Acquisition
Corp I, a Cayman Islands exempted company (the “ Company”), issued an unsecured promissory note (the “ Promissory Note”)
in the principal amount of $1,660,000 to Constellation Sponsor LP, a Delaware limited partnership, bearing no interest and maturing once
the Company closes its initial business combination. On June 5, 2025, the Company amended the promissory note (the “ Amendment”),
to increase the principal amount by $590,000 from $1,660,000 to $2,250,000. Unless otherwise set forth in the Amendment, all other provisions
of the Promissory Note remain in full force and effect.

The foregoing description of the Amendment is
qualified in its entirety by reference to the full text of the Amendment, which is incorporated by reference herein and filed herewith
as Exhibit 10.1.

Item 2.03 Creation of a Direct Financial Obligation
or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The disclosure contained in Item 1.01 of this
Current Report on Form 8-K is incorporated by reference in this Item 2.03.

Item 9.01. Exhibits.

(d) Exhibits

  Exhibit No.      Exhibit                                                                                                                       
         10.1      Amendment to the Promissory Note, dated June 5, 2025, between Constellation Acquisition Corp I and Constellation Sponsor LP.  
          104      Cover Page Interactive Data File (embedded within the Inline XBRL document).                                                  

SIGNATURES

Pursuant to the requirements of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

                           CONSTELLATION ACQUISITION CORP I                               
  Dated: June 5, 2025      By:                                   /s/ Chandra R. Patel     
                                                                 Chandra R. Patel         
                                                                 Chief Executive Officer