Form 4 Filing for Stuart Alexander D.

Stuart Alexander D., a director at Black Stone Minerals, L.P. (BSM), acquired 1570 common units on April 2, 2026, at a price of $15.12 per unit. This acquisition was made in lieu of a cash retainer for his board services, as indicated by footnote F1. Following this transaction, Stuart Alexander D. has a total of 2,054,275 common units. The filing also details various indirect holdings through trusts and other entities, including RDS Investments, L.P. (1,251,634 units) and Topsfield Energy Ltd. (2,112,711 units).