Bain Capital Specialty Finance (BCSF) 10-Q 2018 Q3 Quarterly report

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Bain Capital Specialty Finance, Inc. (the “Company”) for the quarterly period ended September 30, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael A. Ewald, Chief Executive Officer of the Company, and I, Sally F. Dornaus, Chief Financial Officer of the Company, each certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to our knowledge:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: October 17, 2018

/s/ Michael A. Ewald

Michael A. Ewald

Chief Executive Officer

Bain Capital Specialty Finance, Inc.

/s/ Sally F. Dornaus

Sally F. Dornaus

Chief Financial Officer

Bain Capital Specialty Finance, Inc.