Columbus Acquisition closes WISeSat.Space merger

The attached press release carries the closing announcement but is not incorporated by reference into Securities Act or Exchange Act filings.

Rhea-AI Filing Summary

Columbus Acquisition Corp. disclosed that WISeSat.Space Holdings Corp., a British Virgin Islands business company, issued a press release on October 1, 2026, announcing the closing of its business combination with Columbus. The press release is attached to the report. Its information is not deemed filed for purposes of Section 18 of the Exchange Act and is not incorporated by reference into filings under the Securities Act or the Exchange Act.

Key Figures

Ordinary shares per unit: 1 ordinary share Right entitlement: one-seventh of one ordinary share Ordinary-share par value: $0.0001 per share

3 metrics

Ordinary shares per unit 1 ordinary share Unit composition

Right entitlement one-seventh of one ordinary share Entitlement for one whole right

Ordinary-share par value $0.0001 per share Listed ordinary shares

Key Terms

business combination, Regulation FD Disclosure, incorporated by reference

3 terms

business combination financial

"closing of its business combination with Columbus Acquisition Corp."

A business combination happens when two or more companies join together to operate as one, like two friends merging their teams into a single group. This is important because it can change how companies grow, compete, and make money, often making them bigger and more powerful in the market.

Regulation FD Disclosure regulatory

"Item 7.01 Regulation FD Disclosure."

Regulation FD disclosure requires public companies to share important, market-moving information with everyone at the same time instead of tipping off analysts or large investors first. Think of it as making sure all players on a field hear the same announcement simultaneously; that fairness helps investors trust that stock prices reflect the same information and reduces the risk of sudden, unfair trading advantages or regulatory penalties for selective leaks.

incorporated by reference regulatory

"shall not be deemed incorporated by reference into any filing"

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What business combination did COLA report?

WISeSat.Space Holdings Corp. issued a press release on October 1, 2026, announcing the closing of its business combination with Columbus Acquisition Corp.

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Available on EDGAR 10/02/2026 - 05:43 PM Accepted by SEC EDGAR 10/02/2026 - 07:39 AM Learn about SEC filing dates

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

October 1, 2026

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 October 1, 2026, WISeSat.Space Holdings Corp., a British Virgin Islands business company, issued a press release announcing the closing of its business combination with Columbus Acquisition Corp., a Cayman Islands exempted company. 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.

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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 October 1, 2026
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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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: October 2, 2026

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