Company: CSTAF
Filing Date: 2025-02-28
Form Type: DEFA14A
Source: 0001213900-25-018783
Chunk: 0

Company: Constellation Acquisition Corp I
Filing Date: 2025-02-28
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):
February 25, 2025

CONSTELLATION ACQUISITION CORP I

(Exact name of registrant as specified in its charter)</div>

| Cayman Islands               |     | 001-39945               |     | 98-1574835         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission File Number |     | -IRS Employer      
 Identification No. |

| 200 Park Avenue                          
 32nd Floor                               
 New York, NY                             |     |     10166 |
| (Address of principal executive offices) |     | -Zip Code |

<div align='center'>( 646) 585-8975

Registrant’s telephone number, including
area code

Not Applicable

(Former name or former address, if changed since
last report)</div>

Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)                  |
| ☒ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)                 |
| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to
Section 12(b) of the Act:

| Title of each class                                                                                               |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Class A ordinary shares, par value $0.0001 per share                                                              |     | CSTAF             |     | OTCQX® Best Market                        |
| Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 |     | CSTWF             |     | OTCQB