Form 8-K

8-K — Columbus Acquisition Corp/Cayman Islands

Accession: 0001213900-26-085084

Filed: 2026-08-04

Period: 2026-07-30

CIK: 0002028201

SIC: 6770 (BLANK CHECKS)

Item: Entry into a Material Definitive Agreement

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

Item: Unregistered Sales of Equity Securities

Item: Financial Statements and Exhibits

Documents

8-K — ea0300015-8k425_columbus.htm (Primary)

EX-10.1 — TARGET EXTENSION PROMISSORY NOTE DATED JULY 30, 2026, ISSUED BY THE COMPANY TO WISESAT.SPACE CORP (ea030001501ex10-1.htm)

EX-10.2 — SPONSOR EXTENSION PROMISSORY NOTE DATED JULY 30, 2026, ISSUED BY THE COMPANY TO HERCULES CAPITAL MANAGEMENT VII CORP (ea030001501ex10-2.htm)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K — CURRENT REPORT

8-K (Primary)

Filename: ea0300015-8k425_columbus.htm · Sequence: 1

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Singapore

0002028201

Columbus Acquisition Corp/Cayman Islands

00-0000000

0002028201

2026-07-30

0002028201

COLA:UnitsConsistingOfOneOrdinaryShare0.0001ParValueAndOneRightToAcquireOneseventhOfOneOrdinaryShareMember

2026-07-30

0002028201

COLA:OrdinarySharesParValue0.0001PerShareMember

2026-07-30

0002028201

COLA:RightsEachWholeRightToAcquireOneseventhOfOneOrdinaryShareMember

2026-07-30

iso4217:USD

xbrli:shares

iso4217:USD

xbrli:shares

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): August 5, 2026 (July

30, 2026)

COLUMBUS

ACQUISITION CORP

(Exact

name of registrant as specified in its charter)

Cayman

Islands

001-42485

N/A

(State

or other jurisdiction

(Commission

File Number)

(IRS

Employer

incorporation)

Identification

Number)

14 Prudential Tower

Singapore 049712

(Address of principal executive offices)

(+1)

949 899 1827

(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:

☒

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities

registered pursuant to Section 12(b) of the Act.

Title

of each class

Trading

Symbol

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 (§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

☒

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.

Pursuant

to the amended and restated memorandum and articles of association (the “Charter”) of the Columbus Acquisition Corp,

a Cayman Islands exempted company (the “Company”), the Company had until July 22, 2026 to complete its initial business

combination, however the Company may extend the period of time to consummate a business combination up to January 22, 2027, each by a

one-month extension, subject to the deposit of $50,000 (the “Monthly Extension Fee”) into the trust account of the

Company (the “Trust Account”).

July 21, 2026, an aggregate of $50,000 of the Monthly Extension Fee was deposited into the Trust Account for the public shareholders,

which enabled the Company to extend the period of time it has to consummate its initial business combination by one month from July 22,

2026 to August 22, 2026. Among the Monthly Extension Fee, $25,000 was paid by Hercules Capital Management VII Corp, a British Virgin

Islands company and the Sponsor of the Company (the “Sponsor”), and the remaining $25,000 was paid by WISeSat.Space

Corp., a British Virgin Islands business company (the “Target”) pursuant to that certain business combination agreement

dated as of November 9, 2025 (as it may be amended, supplemented, or otherwise modified from time to time, the “Business Combination

Agreement”) by and among the Company, WISeSat.Space Holdings Corp., a British Virgin Islands business company (“Pubco”),

WISeSat Merger Sub Corp., a Cayman Islands exempted company and a wholly owned subsidiary of Pubco (“Merger Sub”),

the Target, and WISeKey International Holding Ltd., a Swiss company (together with its successors, including after its anticipated domestication

to the British Virgin Islands prior to the Closing, the “Seller”).

July 30, 2026, the Company issued an unsecured promissory note in the principal amount of $25,000 to the Target in connection with the

Target’s payment of 50% of the Monthly Extension Fee (the “Target Extension Note”). On July 30, 2026, the Company

issued an unsecured promissory note in the principal amount of $25,000 to the Sponsor in connection with the Sponsor’s payment

of 50% of the Monthly Extension Fee (the “Sponsor Extension Note” and, together with the Target Extension Note, the

“Extension Notes”).

The

Target Extension Note bears no interest and is payable in full upon the earliest to occur of (i) the termination date of the Business

Combination Agreement in accordance with its terms other than by the Company pursuant to Section 10.1(e) thereof, (ii) the date on which

the Company consummates its initial business combination, including the proposed business combination with the Target (a “Business

Combination”), and (iii) the date that the winding up of the Company is effective. The Sponsor Extension Note bears no interest

and is payable in full upon the earlier of (i) the date on which the Company consummates its Business Combination, and (ii) the date

that the winding up of the Company is effective.

The

payee of each of the Extension Notes, or its registered assigns or successors in interest (the “Payee”), has the right,

but not the obligation, to convert the outstanding unpaid obligations payable to the Payee under the Extension Notes, as applicable,

in whole or in part, respectively, into private units (the “Conversion Units”) of the Company at a price of $10.00

per unit, each consisting of one ordinary share, par value $0.0001 per share (the “Ordinary Share”) and one right

to receive one-seventh (1/7) of one Ordinary Share upon the consummation of a Business Combination, as described in the prospectus of

the Company (File No: 333-283278).

Notwithstanding

the foregoing, with respect to the Target Extension Note, in the event of a valid termination of the Business Combination Agreement by

the Company pursuant to Section 10.1(e) thereof, upon the completion of a Business Combination of the Company with other targets, other

than the Target or its affiliate, the Payee, at its sole election, may choose (i) either repayment of the outstanding amount under the

Target Extension Note, or (ii) to convert the outstanding amount into common or ordinary shares of the post-closing public company in

such Business Combination (“Conversion Shares”) at a price per share equal to $5.00 (with such price to be equitably

adjusted if the Ordinary Shares, par value are subject to any share splits, share dividends, combinations, recapitalizations and the

like after the date of such Target Extension Note or are not converted into common or ordinary shares of the post-closing public company

in such Business Combination on a one-for-one basis).

The

issuance of the Extension Notes was made pursuant to the exemption from registration contained in Section 4(a)(2) of the Securities Act

of 1933, as amended.

copy of the Target Extension Note is attached as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The foregoing description of the Target Extension Note does not purport to be complete and is subject to, and is qualified in its entirety

by, the full text of the Target Extension Note.

copy of the Sponsor Extension Note is attached as Exhibit 10.2 to this Current Report on Form 8-K and is incorporated herein by reference.

The foregoing description of the Sponsor Extension Note does not purport to be complete and is subject to, and is qualified in its entirety

by, the full text of the Sponsor Extension Note.

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 Conversion Units (and the underlying securities) issuable upon conversion of the Sponsor Extension Note, as applicable,

if any, (1) may not, subject to certain limited exceptions, be transferable or salable by the Sponsor until the completion of a Business

Combination and (2) are entitled to registration rights. The Conversion Units (and the underlying securities) and/or the Conversion Shares,

issuable upon conversion of the Target Extension Note, as applicable, if any, (1) may not, subject to certain limited exceptions, be

transferable or salable by the Target until the expiration of the Lock-up Period (as defined in the Lock-Up Agreement as defined in the

Business Combination Agreement) and (2) are entitled to registration rights.

Forward-Looking

Statements

This

Current Report on Form 8-K contains certain statements that are not historical facts and are forward-looking statements within the meaning

of the federal securities laws with respect to the proposed Business Combination, including without limitation statements regarding the

anticipated benefits of the proposed Business Combination, the anticipated timing of the proposed Business Combination, the implied enterprise

value, future financial condition and performance of the combined company after the Closing and expected financial impacts of the proposed

Business Combination, the satisfaction of closing conditions to the proposed Business Combination, the level of redemptions of the Company’s

public shareholders and the products and markets and expected future performance and market opportunities of the combined company. These

forward-looking statements generally are identified by the words “believe,” “project,” “expect,”

“anticipate,” “estimate,” “intend,” “think,” “strategy,” “future,”

“opportunity,” “potential,” “plan,” “seeks,” “may,” “should,”

“will,” “would,” “will be,” “will continue,” “will likely result,” and similar

expressions, but the absence of these words does not mean that a statement is not forward-looking. Forward-looking statements are predictions,

projections and other statements about future events that are based on current expectations and assumptions and, as a result, are subject

to risks and uncertainties.

These

forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on as,

a guarantee, an assurance, a prediction or a definitive statement of fact or probability. Actual events and circumstances are difficult

or impossible to predict and will differ from assumptions. Many factors could cause actual future events to differ materially from the

forward-looking statements in this communication, including but not limited to: (i) the risk that the proposed Business Combination may

not be completed in a timely manner or at all, which may adversely affect the price of the Company’s securities; (ii) the risk

that the proposed Business Combination may not be completed by the Company’s business combination deadline; (iii) the failure to

satisfy the conditions to the consummation of the proposed Business Combination, including the approval of the Business Combination Agreement

by the shareholders of the Company, the satisfaction of the closing requirements and the receipt of certain governmental, regulatory

and third party approvals; (iv) the occurrence of any event, change or other circumstance that could give rise to the termination of

the Business Combination Agreement; (v) redemptions exceeding anticipated levels; (vi) the failure to meet Nasdaq initial listing standards

in connection with the consummation of the proposed Business Combination; (vii) the effect of the announcement or pendency of the proposed

Business Combination on the Target’s business relationships, operating results, and business generally; (viii) risks that the proposed

Business Combination disrupts current plans and operations of the Target and the Seller; (ix) the outcome of any legal proceedings that

may be instituted against the Company, Pubco, the Target or the Seller related to the Business Combination Agreement or the proposed

Business Combination; (x) changes in the markets in which the Target competes, including with respect to its competitive landscape, technology

evolution, or regulatory changes; (xi) changes in domestic and global general economic conditions; (xii) the risk that Pubco and the

Target may not be able to execute its growth strategies; (xiii) risks related to supply chain disruptions; (xiv) the risk that Pubco

may not be able to develop and maintain effective internal controls; (xv) costs related to the proposed Business Combination and the

failure to realize anticipated benefits of the proposed Business Combination or to realize estimated pro forma results and underlying

assumptions, including with respect to estimated shareholders redemptions; (xvi) the ability to recognize the anticipated benefits of

the proposed Business Combination and to achieve commercialization and development plans, and identify and realize additional opportunities,

which may be affected by, among other things, competition, the ability of the Target to grow and manage growth economically and hire

and retain key employees; (xvii) inability to achieve successful results or to obtain licensing of third-party intellectual property

rights for future discovery and development of the Target’s projects; (xviii) failure to commercialize products and achieve market

acceptance of such products; (xix) the risk that the Target will need to raise additional capital to execute its business plan, which

may not be available on acceptable terms or at all; (xx) the risk that Pubco, post-combination, experiences difficulties in managing

its growth and expanding operations; (xxi) the risk of product liability or regulatory lawsuits or proceedings relating to the Target’s

business; (xxii) risks associated with intellectual property protection; (xxiii) the risk that the Target is unable to secure or protect

its intellectual property; and (xxiv) those factors discussed in the Company’s and Pubco’s filings with the SEC and that

will be contained in the Registration Statement relating to the proposed Business Combination.

The

foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties

that will be described in the “Risk Factors” section of the Registration Statement on Form F-4 (the “Registration Statement”)

and the amendments thereto, and other documents to be filed by the Company and Pubco from time to time with the SEC. These filings identify

and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained

in the forward-looking statements. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put

undue reliance on forward-looking statements, and while the Pubco and the Company may elect to update these forward-looking statements

at some point in the future, they assume no obligation to update or revise these forward-looking statements, whether as a result of new

information, future events or otherwise, except as required by applicable law. None of Pubco, the Seller, the Target or the Company gives

any assurance that Pubco, the Seller, the Target or the Company will achieve expectations. These forward-looking statements should not

be relied upon as representing Pubco’s, the Company’s, the Seller’s or the Target’s assessments as of any date

subsequent to the date of this Current Report. Accordingly, undue reliance should not be placed upon the forward-looking statements.

Additional

Information About the Proposed Business Combination and Where to Find It

connection with the Business Combination Agreement and the Business Combination, Pubco intends to file relevant materials with the

SEC, including the Registration Statement, which will include a proxy statement of the Company and a prospectus for the registration

of Pubco securities in connection with the Business Combination.

THE

PARTIES URGE THEIR INVESTORS, SHAREHOLDERS, AND OTHER INTERESTED PERSONS TO READ, WHEN AVAILABLE, THE PRELIMINARY PROXY STATEMENT/PROSPECTUS

AND DEFINITIVE PROXY STATEMENT/PROSPECTUS, IN EACH CASE WHEN FILED WITH THE SEC AND DOCUMENTS INCORPORATED BY REFERENCE THEREIN BECAUSE

THESE DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION ABOUT THE COMPANY, PUBCO, THE SELLER AND THE PROPOSED BUSINESS COMBINATION. After

the registration statement is declared effective by the SEC, the definitive proxy statement/prospectus and other relevant documents will

be mailed to the shareholders of the Company as of the record date in the future to be established for voting on the Business Combination

and will contain important information about the Business Combination and related matters. Shareholders of the Company and other interested

persons are advised to read, when available, these materials (including any amendments or supplements thereto) and any other relevant

documents in connection with the Company’s solicitation of proxies for the meeting of shareholders to be held to approve, among

other things, the Business Combination, because they will contain important information about the Company, Pubco, the Seller and the

Business Combination. Shareholders and other interested persons will also be able to obtain copies of the preliminary proxy statement/prospectus,

the definitive proxy statement/prospectus, and other relevant materials in connection with the Business Combination, without charge,

once available, at the SEC’s website at www.sec.gov or by directing a request to: Columbus Acquisition Corp, 14 Prudential Tower,

Singapore 049712, telephone: +1 949 899 1827. The information contained on, or that may be accessed through, the websites referenced

in this Current Report on Form 8-K in each case is not incorporated by reference into, and is not a part of, this Current Report on Form

8-K.

Participants

in the Solicitation

The

Company, Pubco, the Seller, and their respective directors, executive officers, other members of management, and employees, under SEC

rules, may be deemed participants in the solicitation of proxies of the Company’s shareholders in connection with the Business

Combination. Investors and security holders may obtain more detailed information regarding the names and interests in the Business Combination

of the directors and officers of the Company, Pubco and the Seller in the Registration Statement to be filed with the SEC by Pubco, which

will include the proxy statement of the Company for the Business Combination. Information about the Company’s directors and executive

officers is also available in the Company’s filings with the SEC.

Non-Solicitation

This

Current Report on Form 8-K is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities

or in respect of the Business Combination and shall not constitute an offer to sell or a solicitation of an offer to buy any securities,

or a solicitation of any vote or approval, nor shall there be any sale of securities in any state or jurisdiction in which such offer,

solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

No offer of securities shall be made except by means of a prospectus meeting the requirements of the Securities Act of 1933, as amended,

or an exemption therefrom.

Item

9.01 Financial Statements and Exhibits.

Exhibit No.

Description of Exhibits

10.1

Target Extension Promissory Note dated July 30, 2026, issued by the Company to WISeSat.Space Corp.

10.2

Sponsor Extension Promissory Note dated July 30, 2026, issued by the Company to Hercules Capital Management VII Corp.

104

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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

Date:

August 4, 2026

EX-10.1 — TARGET EXTENSION PROMISSORY NOTE DATED JULY 30, 2026, ISSUED BY THE COMPANY TO WISESAT.SPACE CORP

EX-10.1

Filename: ea030001501ex10-1.htm · Sequence: 2

Exhibit

10.1

This

Promissory Note (this “Note”) and the securities issuable upon conversion of this Note pursuant to the terms

hereof have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or any

state securities laws and neither this note, such securities nor any interest therein may be offered, sold, transferred, pledged or otherwise

disposed of except pursuant to an effective registration statement under such act or such laws or an exemption from registration under

such act and such laws which, in the opinion of counsel for maker, is available.

CONVERTIBLE

PROMISSORY NOTE

Principal

Amount: $25,000

Dated

as of July 30, 2026

Columbus

Acquisition Corp., a Cayman Islands exempted company (the “Maker”), promises to pay to the order of WISeSat.Space

Corp., a British Virgin Islands business company, or its registered assigns or successors in interest (the “Payee”),

or order, the principal sum of Twenty-Five Thousand U.S. Dollars ($25,000) (the “Principal Amount”) in lawful

money of the United States of America, on the terms and conditions described below. Except to the extent that the obligations under this

Note are converted into Conversion Units (as defined below) in accordance with Section 2(a) below or Conversion Shares (as defined

below) in accordance with Section 2(b) below, all payments on this Note shall be made by check or wire transfer of immediately

available funds or as otherwise determined by the Maker to such account as Payee may from time to time designate by written notice in

accordance with the provisions of this Note. Reference is hereby made to that certain Business Combination Agreement, dated as of November

9, 2025 (as may be amended in accordance with the terms thereof, the “BCA”), by and among Maker, the Payee,

WISeKey International Holding Ltd., a Swiss company (together with its successors, the “Seller”), and the other

parties named therein. This Note is a “Company Note” under the BCA and reflects the terms of the loan made by the Payee to

Maker on or about the date hereof in an amount equal to the Principal Amount pursuant to Section 8.19(a) of the BCA for fifty percent

(50%) of an Extension Payment (as defined in the BCA).

1. Repayment

of Principal. The principal balance of this Note shall be payable by the Maker on the earliest to occur of (i) the date on which

the BCA is terminated in accordance with its terms other than by Maker pursuant to Section 10.1(e) thereof, (ii) the date on which Maker

consummates its initial business combination (as described in the IPO Prospectus (as defined below), including pursuant to the BCA (the

“Business Combination”), and (iii) the date that the winding up of Maker is effective (such earlier date, the

“Maturity Date”). The principal balance may be prepaid at any time, at the election of Maker. Under no circumstances

shall any individual, including any officer, director, employee or shareholder of the Maker, be obligated personally for any obligations

or liabilities of the Maker hereunder. Notwithstanding anything to the contrary contained herein, Maker and Payee agree that in the event

that the transactions contemplated by the BCA are consummated, this Note will be deemed to be automatically assigned to by the Payee

to the Seller immediately prior to the consummation of the transactions contemplated by the BCA and the Seller will have all rights of

the Payee under this Note, including the right to receive payment of Maker’s obligations hereunder (whether in cash or by delivery

of Conversion Units).

2. Conversion.

(a) Notwithstanding

anything to the contrary contained in this Note, at any time at or prior to the consummation of the Business Combination, Payee shall

have the right to convert all or any portion of the outstanding unpaid obligations owed to Payee under this Note into securities of Maker

equivalent to the CAC Private Units (as such term is defined in the BCA) that were issued by the Maker in the private placement that

was consummated in connection with Maker’s initial public offering (the “IPO”) (together with any replacement

securities issued by the successor public company to Maker in the Business Combination, “Conversion Units”)

at a price of $10.00 per Conversion Unit.

(b) Notwithstanding

anything to the contrary contained herein, Maker and the Payee agree that in the event of a valid termination of the BCA by Maker pursuant

to Section 10.1(e) thereof, the obligations under this Note will be satisfied by Maker upon the consummation of a Business Combination

with a person or entity other than the Payee or its affiliates by either, at the sole election of Maker, (i) repayment in cash in accordance

with the terms of this Note or (ii) conversion into common or ordinary shares of the post-closing public company in such Business Combination

(“Conversion Shares”) at a price per share equal to Five U.S. Dollars ($5.00) (with such price to be equitably

adjusted if Maker’s ordinary shares, par value $0.0001 per share, are subject to any share splits, share dividends, combinations,

recapitalizations and the like after the date of this Note or are not converted into common or ordinary shares of the post-closing public

company in such Business Combination on a one-for-one basis).

any complete or partial conversion of the outstanding obligations under this Note in accordance with this Section 2, (i) the amount

of such obligations shall be so converted and such converted portion of this Note shall become fully paid and satisfied, (ii) Payee shall

surrender and deliver this Note, duly endorsed, to Maker or such other address which Maker shall designate against delivery of the Conversion

Units or Conversion shares, as applicable, (iii) Maker shall promptly deliver a new duly executed Note to Payee in the principal amount

that remains outstanding, if any, after any such conversion, and (iv) in exchange for all or any portion of the surrendered Note, Maker

shall, at the direction of Payee, deliver to Payee or its designees the Conversion Units or Conversion Shares, as applicable, which shall

bear such legends as are required, in the opinion of counsel to Maker or by any other agreement between Maker and Payee and applicable

state and federal securities laws.

3. Interest.

No interest shall accrue on the unpaid principal balance of this Note.

4. Events

of Default. The following shall constitute an event of default (“Event of Default”):

(a) Failure

to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to this Note within three (3) business days

of the Maturity Date.

(b) Other

Maker Breach. The material breach by Maker of any of its covenants or agreements set forth in this Note (other than as described

in Section 4(a) above) which is not cured within ten (10) business days after receipt by Maker of written notice of such material

breach from the Payee.

Bankruptcy, Etc. The commencement by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation

or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian,

sequestrator, restructuring officer (or other similar official) of Maker or for any substantial part of its property, or the making by

it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the

taking of corporate action by Maker in furtherance of any of the foregoing.

(d) Involuntary

Bankruptcy, Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in respect of Maker in

an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee,

custodian, trustee, sequestrator, restructuring officer (or similar official) of Maker or for any substantial part of its property, or

ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a period

of sixty (60) consecutive days.

5. Remedies.

In each case subject to the provisions of Section 10 of this Note:

(a) Upon

the occurrence of an Event of Default specified in Section 4(a) or 4(b) hereof, Payee may, by written notice to Maker,

declare this Note to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable

hereunder, shall become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which are

hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding.

(b) Upon

the occurrence of an Event of Default specified in Section 4(c) or 4(d) hereof, the unpaid principal balance of this Note,

and all other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases without

any action on the part of Payee.

the occurrence of an Event of Default, Maker hereby agrees to pay for all reasonable out-of-pocket costs of collection and any other

enforcement of this Note, including reasonable out-of-pocket attorneys’ fees and reasonable expenses and court costs.

6. Waivers.

Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor,

protest, and notice of protest with regard to this Note, all errors, defects and imperfections in any proceedings instituted by Payee

under the terms of this Note, and all benefits that might accrue to Maker by virtue of any present or future laws exempting any property,

real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution,

or providing for any stay of execution, exemption from civil process, or extension of time for payment, and Maker agrees that any real

estate that may be levied upon pursuant to a judgment obtained by virtue hereof or any writ of execution issued hereon, may be sold upon

any such writ in whole or in part in any order desired by Payee.

7. Unconditional

Liability. Maker hereby waives all notices in connection with the delivery, acceptance, performance, default, or enforcement of the

payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall

not be affected in any manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee,

and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the

payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto

without notice to Maker or affecting Maker’s liability hereunder.

8. Notices.

All notices, consents, waivers and other communications hereunder shall be in writing and shall be deemed to have been duly given

when delivered (i) in person, (ii) by email, with affirmative confirmation of receipt, (iii) one business day after being sent, if sent

by reputable, nationally recognized overnight courier service or (iv) three (3) business days after being mailed, if sent by registered

or certified mail, in each case to the applicable party at the address set forth underneath such party’s signature on the signature

page hereto (or at such other address for a party as shall be specified by like notice).

Governing Law; Jurisdiction; Waiver of Jury Trial. This Note shall be governed by and

interpreted and enforced in accordance with the laws of the State of New York, without regard to the conflicts of laws rules thereof.

Any legal suit, action or proceeding arising out of or relating to this Note shall be instituted exclusively in the state or federal

courts sitting in or otherwise serving New York, County, New York (or in any appellate courts thereof) (the “Specified Courts”).

The parties hereto hereby: (i) waive any objection which they may now have or hereafter have to the venue of any such suit, action or

proceeding, and (ii) irrevocably consent to the jurisdiction of the Specified Courts in any such suit, action or proceeding. The parties

further agree to accept and acknowledge service of any and all process which may be served in any such suit, action or proceeding in

any Specified Court and agree that service of process upon a party mailed by certified mail to such party’s address in accordance

with Section 8 above shall be deemed in every respect effective service of process upon such party in any such suit, action or

proceeding. Each party agrees that a final judgement in any legal suit, action or proceeding shall be conclusive and may be enforced

in other jurisdictions by suit on the judgement or in any other manner provided by applicable law. Each

party hereto hereby irrevocably waives any and all right to trial by jury in any legal proceeding arising out of or related to this note

or any obligations hereunder.

10. Trust

Waiver. Payee understands that, as described in the final prospectus of Maker, dated as of January 22, 2025, and filed with the U.S.

Securities and Exchange Commission on January 24, 2025 (File Nos. 333- 283278) (the “IPO Prospectus”), Maker

has established a trust account (the “Trust Account”) containing the proceeds of the IPO and the overallotment

securities acquired by its underwriters and from certain private placements occurring simultaneously with the IPO (including interest

accrued from time to time thereon) for the benefit of Maker’s public shareholders (including overallotment shares acquired by Maker’s

underwriters, the “Public Shareholders”), and that Maker may disburse monies from the Trust Account only in

the circumstances described in the IPO Prospectus. For and in consideration of Maker entering into this Note, and for other good and

valuable consideration, the receipt and sufficiency of which is hereby acknowledged, Payee hereby agrees on behalf of itself and its

subsidiaries that, notwithstanding anything to the contrary in this Note, neither Payee nor any of its subsidiaries do now or shall at

any time hereafter have any right, title, interest or claim of any kind in or to any monies in the Trust Account or distributions therefrom

to Public Shareholders (“Public Distributions”), or make any claim against the Trust Account or Public Distributions,

with respect to any claim based upon, arising out of or in connection with this Note or Maker’s obligations hereunder, and regardless

of whether such claim arises based on contract, tort, equity or any other theory of legal liability (collectively, the “Released

Claims”). Payee on behalf of itself and its subsidiaries hereby irrevocably waives any Released Claims that Payee or any

of its subsidiaries may have against the Trust Account or Public Distributions now or in the future and will not seek recourse against

the Trust Account or Public Distributions for any Released Claims. Payee agrees and acknowledges that such irrevocable waiver is material

to this Note and specifically relied upon by Maker and its affiliates to induce Maker to enter into this Note, and Payee further intends

and understands such waiver to be valid, binding and enforceable against Payee and each of its subsidiaries under applicable law. The

provisions of this Section 10 shall survive any termination or satisfaction of this Note and be in addition to, and not in limitation

of, any releases of any claims provided by Payee pursuant to any other agreement between Payee and the Maker.

11. Miscellaneous.

This Note constitutes the entire agreement between the parties with respect to the subject matter hereof and referenced herein, and

supersedes and terminates any prior agreements between the parties or their respective affiliates (written or oral) with respect to the

subject matter hereof. This Note may not be modified, amended, waived, extended, changed, discharged or terminated orally or by any act

or failure to act on the part of a party hereto but only by an agreement in writing signed by the party against whom enforcement of any

modification, amendment, waiver, extension, change, discharge or termination is sought. No failure or delay by a party in exercising

any right, power or privilege hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any

other or further exercise thereof or the exercise of any other right, power or privilege. Any provision contained in this Note which

is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or

unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction

shall not invalidate or render unenforceable such provision in any other jurisdiction. Except as set forth in Section 1, no assignment

or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without

the prior written consent of the other party hereto and any attempted assignment without the required consent shall be null and void

ab initio. Subject to the foregoing, this Note shall inure to the benefit of and be binding upon the successors and permitted assigns

of Maker and Payee. Other than the Seller, who is an express third party beneficiary of this Note and shall be able to enforce the terms

hereof against Maker as if it were an original party hereto, nothing contained in this Note shall create any rights in, or be deemed

to have been executed for the benefit of, any person that is not a party hereto or a successor or permitted assign of such a party. The

headings set forth in this Note are for convenience of reference only and shall not be used in interpreting this Note. In this Note,

unless the context otherwise requires: (i) any pronoun used shall include the corresponding masculine, feminine or neuter forms, and

the singular form of nouns, pronouns and verbs shall include the plural and vice versa; (ii) the term “including” (and with

correlative meaning “include”) shall be deemed in each case to be followed by the words “without limitation”;

(iii) the words “herein”, “hereto” and “hereby” and other words of similar import shall be deemed

in each case to refer to this Note as a whole and not to any particular portion of this Note; and (iv) a ”business day” shall

any day other than a Saturday or a Sunday or a day on which commercial banks are authorized or required to close in New York County,

New York. This Note was prepared jointly by the parties and no rule that it be construed against the drafter will have any application

in its construction or interpretation. This Note may be executed in multiple counterparts, including by facsimile, pdf or other electronic

document transmission, each of which shall be deemed an original and all of which together shall constitute one and the same instrument.

{Remainder

of page intentionally left blank; signature page follows}

WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to be duly executed by the undersigned as of the

day and year first above written.

Columbus Acquisition Corp.

By:

/s/ Fen Zhang

Name:

Fen Zhang

Title:

Chief Executive Officer

Address

for Notice:

Columbus

Acquisition Corp

Prudential Tower

Singapore

049712

Attn:

Fen “Eric” Zhang, CEO

Telephone

No.: (949) 899-1827

Email:

eric.zhang@herculescapital.group

with

a copy (which will not constitute notice) to:

Loeb

and Loeb LLP

345

Park Ave

New

York, NY 10154

Attn:

Ted Paraskevas

Telephone

No: (212) 407-4971

Email:

tparaskevas@loeb.com

Acknowledged

and agreed as of the date first set forth above:

WISeSat.Space

Corp.

By:

/s/

Carlos Moreira

Name:

Carlos Moreira

Title:

Chief Executive Officer

By:

/s/ Gwenael Rouy-Poirier

Name:

Gwenael Rouy-Poirier

Title:

Chief Financial Officer

Address

for Notice:

WISeSat.Space

Corp.

General-Guisan-Strasse

CH-6300

Zug Switzerland

Attn:

David Briffod

Telephone

No.: +41 78 323 9913

Email:

dbriffod@wisekey.com

with

a copy (which will not constitute notice) to:

Ellenoff

Grossman & Schole LLP

1345 Avenue of the Americas, 11th Floor

New York, New York 10105, U.S.A.

Attn: Barry I. Grossman, Esq. Matthew A. Gray, Esq.

Telephone No.: (212) 370-1300

Email: bigrossman@egsllp.com; @egsllp.com

{Signature Page to

Company Note}

EX-10.2 — SPONSOR EXTENSION PROMISSORY NOTE DATED JULY 30, 2026, ISSUED BY THE COMPANY TO HERCULES CAPITAL MANAGEMENT VII CORP

EX-10.2

Filename: ea030001501ex10-2.htm · Sequence: 3

Exhibit

10.2

This

Promissory Note (this “Note”) and the securities issuable upon conversion of this Note pursuant to the terms

hereof have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or any

state securities laws and neither this note, such securities nor any interest therein may be offered, sold, transferred, pledged or otherwise

disposed of except pursuant to an effective registration statement under such act or such laws or an exemption from registration under

such act and such laws which, in the opinion of counsel for maker, is available.

CONVERTIBLE

PROMISSORY NOTE

Principal

Amount: $25,000

Dated

as of July 30, 2026

Columbus

Acquisition Corp., a Cayman Islands exempted company (the “Maker”), promises to pay to the order of Hercules

Capital Management VII Corp, or its registered assigns or successors in interest (the “Payee”), or order, the

principal sum of Twenty-Five Thousand Dollars ($25,000) (the “Principal Amount”) in lawful money of the United

States of America, on the terms and conditions described below. Except to the extent that the obligations under this Note are converted

into Conversion Units (as defined below) in accordance with Section 2(a) below, all payments on this Note shall be made by check

or wire transfer of immediately available funds or as otherwise determined by the Maker to such account as Payee may from time to time

designate by written notice in accordance with the provisions of this Note. Reference is hereby made to that certain Business Combination

Agreement, dated as of November 9, 2025 (as may be amended in accordance with the terms thereof, the “BCA”), by and among

Maker, WISeSat.Space Corp., a British Virgin Islands business company, WISeKey International Holding Ltd., a Swiss company, and the other

parties named therein. This Note reflects the terms of the loan made by the Payee to Maker on or about the date hereof in an amount equal

to the Principal Amount pursuant to Section 8.19(a) of the BCA for fifty percent (50%) of an Extension Payment (as defined in the BCA).

1. Repayment

of Principal. The principal balance of this Note shall be payable by the Maker on the earlier of (i) the date on which the Maker

consummates its initial business combination (as described in the IPO Prospectus (as defined below) (a “Business Combination”),

and (ii) the date that the winding up of Maker is effective (such earlier date, the “Maturity Date”). The principal

balance may be prepaid at any time prior to the Maturity Date, at the election of Maker. Under no circumstances shall any individual,

including any officer, director, employee or shareholder of the Maker, be obligated personally for any obligations or liabilities of

the Maker hereunder.

2. Conversion.

(a) Notwithstanding

anything to the contrary contained in this Note, at any time at or prior to the consummation of a Business Combination, Payee shall have

the right, but not the obligation, to convert all or any portion of the outstanding unpaid obligations owed to Payee under this Note

into private units of Maker, each consisting of one ordinary share and one right to receive one-seventh (1/7) of one ordinary share upon

the consummation of a Business Combination, as described in the IPO Prospectus ( “Conversion Units”) at a price

of $10.00 per Conversion Unit, by providing the Maker with written notice of its intention to convert this Note at least two business

days prior to the closing of a Business Combination..

(b) Upon

any complete or partial conversion of the outstanding obligations under this Note in accordance with this Section 2, (i) the amount

of such obligations shall be so converted and such converted portion of this Note shall become fully paid and satisfied, (ii) Payee shall

surrender and deliver this Note, duly endorsed, to Maker or such other address which Maker shall designate against delivery of the Conversion

Units, (iii) Maker shall promptly deliver a new duly executed Note to Payee in the principal amount that remains outstanding, if any,

after any such conversion, and (iv) in exchange for all or any portion of the surrendered Note, Maker shall, at the direction of Payee,

deliver to Payee or its designees the Conversion Units, which shall bear such legends as are required, in the opinion of counsel to Maker

or by any other agreement between Maker and Payee and applicable state and federal securities laws.