Sec Form 4 Filing - Zhang Fen @ Columbus Acquisition Corp/Cayman Islands - 2025-03-10

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Zhang Fen 2. Issuer Name and Ticker or Trading Symbol Columbus Acquisition Corp/Cayman Islands [ COLA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) CEO (Last) (First) (Middle) C/O COLUMBUS ACQUISITION CORP, 14 PRUDENTIAL TOWER 3. Date of Earliest Transaction (MM/DD/YY) 03/10/2025 (Street) SINGAPORE, U0049712 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Ordinary Shares 03/10/2025 J( 2 ) 225,000 ( 1 ) ( 2 ) D 1,698,290 ( 1 ) ( 3 ) I See Footnote ( 1 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Zhang Fen C/O COLUMBUS ACQUISITION CORP 14 PRUDENTIAL TOWER SINGAPORE, U0049712 X X CEO Signatures /s/ Fen Zhang 03/11/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Hercules Capital Management VII Corp (the "Sponsor") is the record holder of the shares reported herein. Dr. Fen Zhang is the sole director of the Sponsor. As such, Dr. Zhang may be deemed to have beneficial ownership of the ordinary shares held directly by the Sponsor. ( 2 )Representing 225,000 ordinary shares of Columbus Acquisition Corp (the "Issuer") forfeited by the Sponsor for no consideration pursuant to that certain subscription agreement dated March 21, 2024, as further amended on July 25, 2024 and December 20, 2024 by and between the Issuer and the Sponsor. On March 10, 2025, the Sponsor forfeited 225,000 ordinary shares of Columbus Acquisition Corp (the "Issuer") for no consideration as the underwriters of the Issuer's initial public offering (the "IPO") did not exercise the over-allotment option within 45-days from the effective date of the Issuer's Registration Statement on Form S-1 (File No. 333-283278), which was declared effective on January 22, 2025 (the "Forfeiture"). ( 3 )As previously reported on the Form 3 of Dr. Fen Zhang filed on January 22, 2025, immediately prior to the Forfeiture, the Sponsor held collectively 1,923,290 ordinary shares of the Issuer, including (i) 1,689,000 ordinary shares, and (ii) 234,290 ordinary shares included in the private units ("Private Units") acquired by the Sponsor simultaneously with the completion of the IPO on January 24, 2025. As a result of the Forfeiture, the Sponsor currently holds 1,698,290 ordinary shares in total, including (i) 1,464,000 ordinary shares, and (ii) 234,290 ordinary shares included in the Private Units.

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