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

April 17, 2026

Date of Report (Date of earliest event reported)

FLAG SHIP ACQUISITION CORPORATION

(Exact Name of Registrant as Specified in Charter)

26 Broadway, Suite 934

New York, New York 10004

(Address of Principal Executive Offices, and Zip Code)

(646)-362-0256

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 (see General Instruction A.2. below):

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 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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. ☐

On April 17, 2026, Flag Ship Acquisition Corp. (the “Company”) received a deficiency letter (the “Notice”) from the Nasdaq Listing Qualifications Department of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that it was not in compliance with Nasdaq Listing Rule 5250(c)(1) as a result of its failure to timely file its Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “Form 10-K”), as required for continued listing on The Nasdaq Global Market.

Under Nasdaq’s Listing Rules, the Company must submit a plan to regain compliance with Nasdaq within 60 calendar days of the date of the Notice. If the Company’s plan is accepted, then Nasdaq can grant an exception of up to 180 calendar days from the date that the Form 10-K should have been filed, or October 12, 2026. The Notice has no immediate effect on the listing of the Company’s ordinary shares. The Company continues to work diligently to complete the Form 10-K. There can be no assurance, however, that the Company will be able to regain compliance with the listing requirements discussed above or otherwise satisfy the other Nasdaq listing criteria.

On April 22, 2026, the Company issued a press release announcing the receipt of the Notice. A copy of the press release is being furnished herewith as Exhibit 99.1.

In accordance with General Instruction B.2 of Form 8-K, the information contained or incorporated by reference in this Item 7.01, including the press release furnished herewith as Exhibit 99.1, shall not be deemed “filed” for the 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 to be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing, except as shall be expressly set forth by specific reference in such a filing. 

EXHIBIT INDEX

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Company has duly caused this Report on Form 8-K to be signed on its behalf by the undersigned hereunto duly authorized.