Director D. Mark DeWalch Receives 1,240 Common Units as Board Retainer for Black Stone Minerals

D. Mark DeWalch, a director of Black Stone Minerals, L.P. (BSM), received 1,240 common units representing limited partner interests on April 2, 2026, as compensation for his service on the Board of Directors of the Partnership's General Partner. The units were acquired at $15.12 per share through a pre-arranged election to receive common units in lieu of cash retainer fees. Following this transaction, DeWalch directly owns 393,845 common units. Additionally, he holds indirect ownership through various entities: 558,522 units via DeWalch Diversified LP, 40,809 units through the Donald Mark DeWalch Trust, and 6,749 units through his wife. The filing represents a routine director compensation transaction where equity is provided instead of cash for board service.