Star Equity Holdings, Inc.

Star Equity Holdings, Inc. is a diversified holding company that seeks to build long-term shareholder value by acquiring, managing, and growing businesses with strong fundamentals and market opportunities. Its current structure comprises four divisions: Building Solutions, Business Services, Energy Services, and Investments. For more information visit www.starequity.com. On August 22, 2025, the Company completed its previously announced acquisition of Star Operating Companies, Inc. (“Star Operating”, formerly known as Star Equity Holdings, Inc.), pursuant to the Agreement and Plan of Merger, dated as of May 21, 2025 (the “Merger Agreement”), by and among the Company, Star Operating and HSON Merger Sub, Inc., a wholly owned subsidiary of the Company (“Merger Sub”). Upon the terms and subject to the conditions of the Merger Agreement, on August 22, 2025, at the effective time of the merger pursuant to the Merger Agreement (the “Merger”), Merger Sub merged with and into Star Operating, with Star Operating continuing as the surviving corporation of the Merger as a wholly owned subsidiary of the Company. Effective September 5, 2025, the Company changed (i) its name to Star Equity Holdings, Inc. and (ii) its trading symbols on Nasdaq to STRR and STRRP.

Current securities

1. Entry into a Material Definitive Agreement · Regulation FD DisclosureNov 4, 2026
2. Entry into a Material Definitive Agreement · Unregistered Sales of Equity Securities · Regulation FD DisclosureOct 28, 2026
3. S-4 filingOct 19, 2026
4. Regulation FD DisclosureOct 14, 2026
5. Regulation FD DisclosureSep 22, 2026