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

December 29, 2025

Date of Report (Date of earliest event reported)

COLUMBUS ACQUISITION CORP

(Exact Name of Registrant as Specified in its Charter)

Cayman Islands		001-42485		N/A
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

14 Prudential Tower

Singapore 049712

(Address of Principal Executive Offices)

(+1) 949 899 1827

Registrant’s telephone number, including area code

N/A

(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:

☐	Written communications pursuant to Rule 425 under the Securities Act

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act

Securities registered pursuant to Section 12(b) of the Act: None.

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Units, consisting of one ordinary share, $0.0001 par value, and one Right to acquire one-seventh of one ordinary share	COLAU	The Nasdaq Stock Market LLC
Ordinary shares, par value $0.0001 per share	COLA	The Nasdaq Stock Market LLC
Rights, each whole right to acquire one-seventh of one ordinary share	COLAR	The Nasdaq Stock Market LLC

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. ☐

Item 7.01 Regulation FD Disclosure.

On December 29, 2025, WISeKey International Holding AG (SIX: WIHN, NASDAQ: WKEY), a Swiss company of unlimited duration with limited liability under the laws of Switzerland, and Columbus Acquisition Corp (“CAC”), issued a joint press release announcing the confidential submission of a draft registration statement on Form F-4 with the U.S. Securities and Exchange Commission (“SEC”) on December 23, 2025. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by reference.

The press release shall not be deemed “filed” for any purpose, including 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. The information in this Item 7.01, including Exhibit 99.1, shall not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act regardless of any general incorporation language in the filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

The following exhibits are being filed herewith:

Exhibit No.		Description of Exhibits
99.1		Press Release dated December 29, 2025

104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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.

	Columbus Acquisition Corp

	By:	/s/ Fen Zhang
	Name:	Fen Zhang
	Title:	Chief Executive Officer

Dated: December 29, 2025

Columbus Acquisition Corp filed SEC Form 8-K: Regulation FD Disclosure, Financial Statements and Exhibits