Bain Capital Specialty Finance(BCSF) - 2025 Q4 - Annual Report

FORM 10-K F1, UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from __ to __ Commission file number: 814-01175 BAIN CAPITAL SPECIALTY FINANCE, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 81-2878769 (Sta ...