D. Mark DeWalch Acquires Black Stone Minerals Common Units

D. Mark DeWalch, a director of Black Stone Minerals, L.P. (BSM), acquired 37,650 common units representing limited partner interests on May 28, 2026, at a weighted average price of $13.2096 per unit. The transaction was executed in multiple purchases at prices ranging from $13.19 to $13.205. Following this purchase, DeWalch directly owns 431,495 common units. Additionally, he has indirect ownership through various entities: 558,522 units through DeWalch Diversified LP, 40,809 units through the Donald Mark DeWalch Trust, and 6,749 units held by his wife. The filing was signed by attorney-in-fact Steve Putman on behalf of DeWalch. This transaction represents a significant increase in DeWalch's direct ownership position in the company where he serves as a director.