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 17, 2026

221 W 9^th St #848

Wilmington, DE 19801

(Address of principal executive offices)

909-214-2482

( Registrant’s telephone number, including area code)

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 1.01 Entry into a Material Definitive Agreement.

The disclosures set forth under Item 2.03 are incorporated by reference.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

On April 24, 2026, ST Sponsor II Limited (the “Sponsor”) of Charlton Aria Acquisition Corporation (the “Company”) deposited $850,000 into the trust account, as a result of which, the Company has until July 25, 2026 to complete its initial business combination (the “Extension”).

Pursuant to the Second Amended and Restated Memorandum and Articles of Association of the Company, the Company had until April 25, 2026, or 18 months from the consummation of its initial public company to consummate its initial business combination, provided that the Company may, but is not obligated to, extend the period of time to consummate an initial business combination two times by an additional three months each time if the Sponsor and/or its designees deposit into the trust account $850,000 for each three months extension, for an aggregate of up to $1,700,000. 

In connection with the Extension, the Company issued an unsecured promissory note dated April 23, 2026, in the principal amount of US$850,000 to the Sponsor (the “Extension Note”). The Extension Note does not bear interest, except that overdue amounts accrue default interest at the prevailing short-term U.S. Treasury Bill rate, and the outstanding principal is payable on the earlier of the consummation of the Company’s initial business combination and the Company’s liquidation.

Since the consummation of the initial public offering, the Sponsor advanced the Company in aggregate of approximately $263,681.50 as working capital. On April 17, 2026, the Company issued an unsecured promissory note to the Sponsor in the principal amount of up to US$500,000 (the “Working Capital Note”) partially evidencing the loans provided previously by the Sponsor and partially allowing the Sponsor to provide additional loans thereunder. The Working Capital Note does not bear interest, except that overdue amounts accrue default interest at the prevailing short-term U.S. Treasury Bill rate, and amounts outstanding thereunder are payable on the earlier of the consummation of the Company’s initial business combination and the Company’s liquidation.

The foregoing descriptions of the Extension Note and the Working Capital Note do not purport to be complete and are qualified in their entirety by reference to the full text of the Extension Note and the Working Capital Note, copies of which are filed as Exhibits 10.1 and 10.2 to this Current Report on Form 8-K and are incorporated herein by reference.

Item 3.02 Unregistered Sales of Equity Securities.

The information disclosed under Item 2.03 of this Current Report on Form 8-K is incorporated by reference into this Item 3.02 to the extent required herein. The Units (and the underlying securities) issuable upon conversion of the Extension Note and the Working Capital Note, if any, (1) may not, subject to certain limited exceptions, be transferable or salable by the Payee until the completion of the Company’s initial business combination and (2) are entitled to registration rights.

Item 7.01. Regulation FD Disclosure.

On April 27, 2026, the Company issued a press release announcing the Extension. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

SIGNATURES

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.