Sec Form 4 Filing - Seitz Paul G @ Horizon Technology Finance Corp - 2026-04-14

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 Seitz Paul G 2. Issuer Name and Ticker or Trading Symbol Horizon Technology Finance Corp [ HRZN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Investment Officer (Last) (First) (Middle) 312 FARMINGTON AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 04/14/2026 (Street) FARMINGTON, CT06032 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 Common Stock 04/14/2026 A 142 A 742 D

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 Seitz Paul G 312 FARMINGTON AVENUE FARMINGTON, CT06032 Chief Investment Officer Signatures /s/ Paul G. Seitz 04/14/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Acquired upon the completion of, and pursuant to, the transactions contemplated by the Agreement and Plan of Merger, dated as of August 7, 2025, by and among Horizon Technology Finance Corporation ("HRZN"), a Delaware corporation, Monroe Capital Corporation ("MRCC"), a Maryland corporation, HMMS, Inc., a Maryland corporation, Monroe Capital BDC Advisors, LLC, a Delaware limited liability company, and Horizon Technology Finance Management LLC, a Delaware limited liability company (the "Merger Agreement"). Pursuant to the Merger Agreement, each share of MRCC common stock, par value $0.001 per share, was converted into the right to receive 0.9402 shares of HRZN common stock, par value $0.001 per share. The market price of HRZN common stock at the close of trading on April 13, 2026, the last trading day prior to closing of the merger, was $4.57.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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