Exhibit 99.1 Blackstone Secured Lending Fund Reports First Quarter 2024 Results NEW YORK — May 8, 2024 — Blackstone Secured Lending Fund (NYSE: BXSL, or the “Company”) today reported its first quarter 2024 results. Brad Marshall and Jonathan Bock, Co-Chief Executive Officers of Blackstone Secured Lending Fund, said, “BXSL reported another quarter of strong net investment income, increased net asset value, higher net income per share, and continued healthy credit performance. Our portfolio remains defensive ...