X0609 4 2026-08-07 0 0001476765 GOLUB CAPITAL BDC, Inc. GBDC 0001298389 Golub David false C/O GOLUB CAPITAL BDC, INC. 200 PARK AVENUE, 25TH FLOOR NEW YORK NY 10166 1 1 0 0 Chairman & CEO 0 Common Stock, par value $0.001 per share 2026-08-07 4 S 0 1676387 13.06 D 0 I By GEMS Fund 4, L.P. Common Stock, par value $0.001 per share 188676 I By CDGPE, LLC Common Stock, par value $0.001 per share 166672 I By CDGQ LLC Common Stock, par value $0.001 per share 125388 D Due to his control of GEMS Fund 4, L.P., Mr. Golub may be viewed as having investment power over all of the shares owned by such entity although voting rights were passed through to the limited partners.Mr. Golub disclaims beneficial ownership of such shares of GBDC common stock held by GEMS Fund 4, L.P., except to the extent of his pecuniary interest therein. The shares reported herein are directly beneficially owned by CDGPE, LLC and are held for the benefit of Mr. Golub's family trust. The shares reported herein are directly beneficially owned by CDGQ, LLC and are held for the benefit of Mr. Golub's family trust. /s/ David B. Golub 2026-08-11