8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or Section 15(d) of theSecurities Exchange Act of 1934

Date of Report (Date of earliest event reported):January 23, 2023 (January 20, 2023)

CONSTELLATION

ACQUISITION CORP I

(Exact name of registrant as specified in its charter)

+1

914 615 9912

Registrant’s telephone number, including area code

NotApplicable

(Former name or former address, if changed since last report)

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

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

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

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 8.01. Other Events.

On December 30, 2022, Constellation Acquisition Corp I (“Constellation”) filed a definitive proxy statement (the “Extension Proxy Statement”) for an extraordinary general meeting of its shareholders to be held on January 24, 2023 (the “Extraordinary General Meeting”) to consider and act upon a proposal to extend the date (the “Termination Date”) by which Constellation must complete an initial business combination to April 29, 2023 (the “Articles Extension Date”) and to allow Constellation, without the need for another shareholder vote, to elect to extend the Termination Date to consummate a business combination on a monthly basis, for up to nine times, by an additional one month each time, after the Articles Extension Date, by resolution of Constellation’s board of directors, if requested by Constellation Sponsor GmbH & Co. KG, a German limited partnership. The Extension Proxy Statement was mailed to Constellation shareholders of record as of December 27, 2022. Shareholders may obtain a copy of the Extension Proxy Statement at the SEC’s website (www.sec.gov).

Constellation intends to open and promptly adjourn the Extraordinary General Meeting until 8:00 AM ET on January 26, 2023 in order to allow additional time for Constellation to engage with its shareholders. All Constellation shareholders of record as of the close of business on December 27, 2022 are entitled to vote at the Extraordinary General Meeting. Constellation shareholders who have not already voted, or wish to change their vote, are strongly encouraged to submit their proxies as soon as possible. Valid proxies submitted by shareholders prior to the Extraordinary General Meeting will continue to be valid for purposes of the rescheduled Extraodrinary General Meeting. For more information on how to vote, please call Constellation’s proxy solicitor, Morrow Sodali, at (800) 662-5200 for shareholders or (203) 658-9400 for bankers and brokers or email CSTA.info@investor.morrowsodali.com.

1

SIGNATURE

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: January 23, 2023

2