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): April 30, 2026

CALISA ACQUISITION CORP

(Exact Name of Registrant as Specified in Charter)

205 W. 37th Street

New York, NY 10018

(Address of Principal Executive Offices) (Zip Code)

(203) 998-5540

(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 (§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 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On April 30, 2026, Calisa Acquisition Corp (the “Company”) received a written notice (the “Notice”) from the Listing Qualifications Department of The Nasdaq Stock Market (“Nasdaq”) indicating that the Company is not in compliance with Listing Rule 5450(a)(2) (the “Minimum Total Holders Rule”), which requires the Company to have at least of 400 “Total Holders” (generally defined as both beneficial holders and holders of record) of the Company’s ordinary shares for continued listing on the exchange.

The Notice stated that no later than June 15, 2026, the Company is required to submit a plan to regain compliance with the Minimum Total Holders Rule. If Nasdaq accepts the Company’s plan, Nasdaq may grant the Company an extension of up to 180 calendar days from the date of the Notice to evidence compliance with the Minimum Total Holders Rule. If Nasdaq does not accept the Company’s plan, the Company will have the opportunity to appeal the decision in front of a Nasdaq Hearings Panel. The Company intends to submit a plan with Nasdaq on or before June 15, 2026 to maintain its Nasdaq listing.

Cautionary Note Regarding Forward Looking Statements

This Current Report on Form 8-K include “forward-looking statements” made pursuant to the safe harbor provisions of the United States Private Securities Litigation Reform Act of 1995. Actual results may differ from expectations, estimates and projections and consequently, you should not rely on these forward-looking statements as predictions of future events. These forward-looking statements generally are identified by the words or phrases such as “aspire,” “expect,” “estimate,” “project,” “budget,” “forecast,” “anticipate,” “intend,” “plan,” “may,” “will,” “will be,” “will continue,” “will likely result,” “could,” “should,” “believe(s),” “predicts,” “potential,” “continue,” “future,” “opportunity,” seek,” “intend,” “strategy,” or the negative version of those words or phrases or similar expressions are intended to identify such forward-looking statements.

The Company cautions readers not to place undue reliance upon any forward-looking statements, which speak only as of the date made. The Company does not undertake or accept any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements to reflect any change in its expectations or any change in events, conditions or circumstances on which any such statement is based.

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: May 4, 2026