Supplement No.1 to Joint Proxy/Prospectus (HRZN) updates Jan 16, 2026 filing

Rhea-AI Filing Summary

Horizon Technology Finance Corporation filed Supplement No. 1 dated March 5, 2026 to the joint proxy statement/prospectus dated January 16, 2026. The supplement amends, supplements or modifies information in the combined prospectus and definitive joint proxy statement of HRZN and Monroe Capital Corporation.

The supplement incorporates by reference previously filed SEC documents and states that the Joint Proxy Statement/Prospectus is available free of charge at www.sec.gov or via the HRZN and MRCC investor relations contact details provided in the text.

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Accepted by SEC EDGAR 03/05/2026 - 09:44 PM Learn about SEC filing dates

FAQ

What does Supplement No.1 for HRZN dated March 5, 2026 do?

It amends, supplements or modifies information in the Joint Proxy Statement/Prospectus dated January 16, 2026. The supplement also incorporates by reference previously filed SEC documents and updates the combined prospectus and definitive joint proxy statement for HRZN and MRCC.

Where can I obtain the HRZN/MRCC Joint Proxy Statement/Prospectus?

You can obtain the Joint Proxy Statement/Prospectus free of charge at www.sec.gov. The supplement also lists investor relations contact numbers and mailing addresses for HRZN and MRCC to request copies directly.

What date is the joint proxy statement/prospectus that the supplement amends?

The joint proxy statement/prospectus was dated January 16, 2026. Supplement No. 1 is dated March 5, 2026 and states it should be read in conjunction with the January 16, 2026 filing.

Does the supplement change defined terms from the Joint Proxy Statement/Prospectus?

Capitalized terms not defined in the supplement retain the meanings assigned in the Joint Proxy Statement/Prospectus. The supplement explicitly states that undefined capitalized terms have the meanings set forth in the joint filing.

Filed Pursuant to Rule 424(b)(3)

Registration No. No. 333-290114

HORIZON TECHNOLOGY FINANCE CORPORATION

MONROE CAPITAL CORPORATION

Supplement No. 1, dated March 5, 2026, to the

Joint Proxy Statement/Prospectus, dated January 16, 2026

This supplement contains information that amends, supplements or modifies certain information contained in the combined prospectus of Horizon Technology Finance Corporation (“HRZN”), and definitive joint proxy statement of HRZN and Monroe Capital Corporation (“MRCC”), dated January 16, 2026 (the “Joint Proxy Statement/Prospectus”). This supplement is part of, and should be read in conjunction with, the Joint Proxy Statement/Prospectus. The Joint Proxy Statement/Prospectus has been filed with the U.S. Securities and Exchange Commission (the “SEC”), and is available free of charge at www.sec.gov or by calling HRZN at (860) 676-8654, or by writing to HRZN at 312 Farmington Avenue, Farmington, Connecticut 06032, Attention: Investor Relations, or by calling MRCC at (312) 258-8300, or by writing to MRCC at 155 North Wacker Drive, 35th Floor, Chicago, Illinois 60606, Attention: Investor Relations. Capitalized terms used herein but not defined shall have the meanings ascribed to such terms in the Joint Proxy Statement/Prospectus.

INCORPORATION BY REFERENCE FOR HRZN

This supplement incorporates by reference the documents set forth below that have previously been filed with the SEC:

• HRZN’s Annual Report on Form 10-K for the period ended December 31, 2025, filed with the SEC on March 3, 2026; and

• HRZN’s Current Report on Form 8-K (other than information furnished rather than filed) filed with the SEC on February 11, 2026.

INCORPORATION BY REFERENCE FOR MRCC

This supplement incorporates by reference the documents set forth below that have previously been filed with the SEC:

• MRCC’s Annual Report on Form 10-K for the period ended December 31, 2025, filed with the SEC on March 5, 2026; and

• MRCC’s Current Report on Form 8-K (other than information furnished rather than filed) filed with the SEC on January 15, 2026.