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): September 9, 2025

CONSTELLATION ACQUISITION CORP I

(Exact name of registrant as specified in its charter)

(646) 585-8975

Registrant’s telephone number, including area code

Not Applicable

(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 of 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 (§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 7.01 Regulation FD Disclosure.

On September 8, 2025 ET (September 9, 2025 AEDT), Jindalee Lithium Limited, an Australian public company listed on the Australian Securities Exchange (“Jindalee”), issued a press release announcing that Jindalee and Constellation Acquisition Corp I (the “Company”) had entered into a non-binding term sheet related to a business combination between the Company and HiTech Minerals, Inc., a Nevada corporation and wholly-owned subsidiary of Jindalee. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Form 8-K”) and is incorporated by reference in this Item 7.01.

The information in this Item 7.01 and Exhibit 99.1 is being furnished pursuant to Item 7.01 of Form 8-K and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing made by the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

No Offer or Solicitation

This filing is for information purposes only and is not intended to and does not constitute, or form part of, an offer, invitation or the solicitation of an offer or invitation to purchase, otherwise acquire, subscribe for, sell or otherwise dispose of any securities, or the solicitation of any vote or approval in any jurisdiction, pursuant to the proposed business combination or otherwise, nor shall there be any sale, issuance or transfer of securities in any jurisdiction in contravention of applicable law.

Forward-Looking Statements

All statements other than statements of historical facts contained in this filing are forward-looking statements. Forward-looking statements may generally be identified by the use of words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “should,” “would,” “plan,” “project,” “forecast,” “predict,” “potential,” “seem,” “seek,” “future,” “outlook,” “target” or other similar expressions (or the negative versions of such words or expressions) that predict or indicate future events or trends or that are not statements of historical matters. These forward-looking statements include, but are not limited to, statements regarding the financial position, business strategy and the plans and objectives of management for future operations including as they relate to the proposed business combination and related transactions, pricing and market opportunity, the satisfaction of closing conditions to the proposed business combination and related transactions, the level of redemptions by the Company’s public shareholders and the timing of the completion of the proposed business combination, including the anticipated closing date of the proposed business combination and the use of the cash proceeds therefrom. These statements are based on various assumptions, whether or not identified in this filing, and on the current expectations of Jindalee’s and the Company’s management and are not predictions of actual performance. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on by any investor as a guarantee, an assurance, a prediction or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and may differ from such assumptions, and such differences may be material. Many actual events and circumstances are beyond the control of Jindalee and the Company. These forward-looking statements are subject to a number of risks and uncertainties, including: (i) that the parties have not entered into a definitive, binding agreement related to the business combination and may never do so, or may do so on terms materially different than those in the non-binding term sheet; (ii) changes in domestic and foreign business, market, financial, political and legal conditions; (iii) if a binding agreement is entered into, the inability of the parties to successfully or timely consummate the proposed business combination, including the risk that any required regulatory approvals are not obtained, are delayed or are subject to unanticipated conditions that could adversely affect the combined company or the expected benefits of the proposed business combination, or that the approval of the shareholders of Jindalee or the Company is not obtained; (iv) the ability to maintain the listing of the combined company’s securities on a national securities exchange following consummation of the proposed business combination; (v) the ability of the parties to complete any private placement financing, in an amount and on terms favorable to the parties; (vi) the risk that any of the proposed conditions to closing of the business combination are not satisfied in the anticipated manner or on the anticipated timeline or are waived by any of the parties thereto; and (vii) the failure by the combined company to realize the anticipated benefits of the proposed business combination and related transactions. If any of these risks materialize or the Company’s or Jindalee’s assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. There may be additional risks that neither the Company nor the Jindalee presently know or that the Company and Jindalee currently believes are immaterial that could also cause actual results to differ from those contained in the forward-looking statements. In addition, forward-looking statements reflect the Company’s and Jindalee’s expectations, plans or forecasts of future events and views as of the date of this filing; the Company and Jindalee anticipate that subsequent events and developments will cause these assessments to change. However, while the Company and Jindalee may elect to update these forward-looking statements at some point in the future, the Company and Jindalee specifically disclaim any obligation to do so, unless required by applicable law. These forward-looking statements should not be relied upon as representing the Company’s and Jindalee’s assessments as of any date subsequent to the date of this filing. Accordingly, undue reliance should not be placed upon the forward-looking statements.

Item 9.01 Financial Statements and Exhibits. Financial Statements and Exhibits.

(d) Exhibits

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: September 9, 2025