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Thomas L. Carter Jr., who serves as CEO, President, Chairman and a director of Black Stone Minerals, L.P. (BSM), reported purchases of common units in two transactions. On 09/11/2025 he purchased 1,300 common units at a weighted-average price of $12.3915, bringing his reported beneficial ownership to 3,498,701 units. On 09/12/2025 he purchased 14,000 common units at a weighted-average price of $12.586, increasing reported ownership to 3,512,701 units. The Form 4 also lists multiple indirect holdings attributed to trusts, a spouse, and Carter2221, Ltd., including an indirect holding of 11,481,503 units by Carter2221, Ltd. The filing is signed by attorney-in-fact Steve Putman on 09/12/2025.