Form 8-K

8-K — Columbus Acquisition Corp/Cayman Islands

Accession: 0001213900-26-106089

Filed: 2026-10-02

Period: 2026-10-01

CIK: 0002028201

SIC: 6770 (BLANK CHECKS)

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — ea0307500-8k425_columbus.htm (Primary)

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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.

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)

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

EX-99.1 — PRESS RELEASE DATED OCTOBER 1, 2026

EX-99.1

Filename: ea030750001ex99-1.htm · Sequence: 2

Exhibit 99.1

WISeSat.Space Holdings Corp. Announces Closing

of Business Combination with Columbus Acquisition Corp

GENEVA, Switzerland, October 1, 2026 -- WISeSat.Space

Holdings Corp., a British Virgin Islands business company (“Pubco” or “WISeSat”), today announced the completion

today October 1, 2026 (“Closing”) of its previously announced business combination with Columbus Acquisition Corp (“CAC”)

(the “Business Combination”). The ordinary shares of Pubco, the combined company following the Business Combination, will

commence trading on the Nasdaq on October 2, 2026, under the ticker symbol “SAIQ.”

The Business Combination was approved by CAC’s

shareholders at an extraordinary general meeting of shareholders on September 30, 2026, and all remaining closing conditions of the Business

Combination were satisfied or waived among the parties as of October 1, 2026 prior to Closing.

Advisors

Maxim Group LLC served as WISeSat’s financial

advisor. Ellenoff Grossman & Schole LLP represented WISeSat as legal counsel and Harney Westwood & Riegels (BVI) LP represented

WISeSat as British Virgin Islands legal counsel. Loeb & Loeb LLP represented CAC as legal counsel and Ogier represented CAC as Cayman

legal counsel. The Equity Group, Inc., served as WISeSat’s strategic communications advisor.

About WISeSat

WISeSat is a space technology company focused

on secure satellite communications for Internet of Things applications. Its approach combines satellite infrastructure with cybersecurity

and digital identity technologies to support trusted communications between connected devices and ground-based systems.

About Columbus Acquisition Corp.

Columbus Acquisition Corp.

is a blank check company, also commonly referred to as a special purpose acquisition company (SPAC) formed for the purpose of effecting

a merger, share exchange, asset acquisition, share purchase, reorganization, or similar business combination with one or more businesses

or entities. Columbus is led by Fen “Eric” Zhang, Chairman and Chief Executive Officer, and Jie “Janet” Hu, Chief

Financial Officer, who are growth-oriented executives with a long track record of value creation across industries.

Forward-Looking Statements

This press release includes “forward-looking

statements” within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform

Act of 1995. Forward-looking statements may be identified by the use of words such as “estimate,” “plan,” “project,”

“forecast,” “intend,” “will,” “expect,” “anticipate,” “believe,”

“seek,” “target” or other similar expressions that predict or indicate future events or trends or that are not

statements of historical matters. These forward-looking statements also include, but are not limited to, statements regarding estimation

of the listing. These statements are based on various assumptions, whether or not identified in this press release, and on the current

expectations of WISeSat’s management and are not predictions of actual performance. These statements involve risks, uncertainties

and other factors that may cause the actual results, levels of activity, performance, or achievements to be materially different from

those expressed or implied by these forward-looking statements. Although WISeSat believes that it has a reasonable basis for each forward-looking

statement contained in this press release, WISeSat cautions you that these statements are based on a combination of facts and factors

currently known and projections of the future, which are inherently uncertain. The forward-looking statements in this press release represent

the views of WISeSat as of the date of this press release. Subsequent events and developments may cause those views to change. Except

as may be required by law, WISeSat does not undertake any duty to update these forward-looking statements.

CONTACTS

WISeSat:

Carlos Moreira

Chairman & CEO

Tel: +41 22 594 3000

info@wisekey.com

WISeSat Investor Relations:

The Equity Group Inc.

Lena Cati

Tel: +1 212 836-9611

Lena.cati@theequitygroup.com

Columbus

Fen Zhang

Chairman and Chief Executive Officer

Email: eric.zhang@herculescapital.group

Tel: (+1) 949 899 1827

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