X0306 4 2020-06-23 0 0001655050 Bain Capital Specialty Finance, Inc. BCSF 0001451084 Richer Clare Stack 200 CLARENDON STREET C/O BAIN CAPITAL CREDIT, LP BOSTON MA 02116 1 0 0 0 Common Stock 2020-06-23 4 J 0 596.00 10.22 A 7367.00 D The reporting person's allocation was confirmed by the broker on June 23, 2020. Reflects additional shares of Common Stock acquired by the reporting person in connection with the Issuer's rights offering pursuant to the over-subscription privilege. /s/ Clare Stack Richer 2020-06-25