Company: CSTAF
Filing Date: 2025-02-28
Form Type: DEFA14A
Source: 0001213900-25-018783
Chunk: 1

Company: Constellation Acquisition Corp I
Filing Date: 2025-02-28
Form: DEFA14A
Chunk 1
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® Venture Market                     |
| Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant                      |     | CSTUF             |     | OTCQX® Best Market                        |

Indicate by check mark whether the registrant is an emerging growth
company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange
Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐

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

On February 25, 2025, Constellation Acquisition
Corp I (the “Company”) drew an aggregate of $5,000 (the “Extension Funds”), as approved by unanimous director
resolution, dated February 25, 2025, pursuant to the unsecured promissory note, dated January 30, 2024 between the Company and Constellation
Sponsor LP (the “Note”), which Extension Funds the Company deposited into the Company’s trust account for its public
shareholders. This deposit enables the Company to extend the date by which it must complete its initial business combination from February
28, 2025 to March 29, 2025 (the “Extension”). The Extension is the first of eleven one-month extensions permitted under the
Company’s amended and restated memorandum and articles of association and provides the Company with additional time to complete
its initial business combination. The Note does not bear interest and matures upon closing of the Company’s initial business combination.
In the event that the Company does not consummate a business combination, the Note will be repaid only from amounts remaining outside
of the Company’s trust account, if any.

<div align='center'>1

SIGNATURE</div>

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.

Dated: February 28, 2025

| CONSTELLATION ACQUISITION CORP I |                         |
| By: