X0407 4 2023-05-05 0 0001621434 Black Stone Minerals, L.P. BSM 0001319960 Carter Thomas L Jr 1001 FANNIN STREET, SUITE 2020 HOUSTON TX 77002 1 1 0 0 CEO and Chairman 0 Common units representing limited partner interests 2023-05-05 4 P 0 31800 15.5348 A 2652791 D Common units representing limited partner interests 37741 I By Georgia Elizabeth Carter 1995 Trust Common units representing limited partner interests 37741 I By Katherine Ross Carter 1995 Trust Common units representing limited partner interests 37742 I By Molly Leachman Carter 1995 Trust Common units representing limited partner interests 13141 I By Fowler Thomas Carter 1995 Trust Common units representing limited partner interests 11481503 I By Carter2221, Ltd. Common units representing limited partner interests 167155 I By spouse The price reported in Column 4 is a weighted average price. These common units were purchased in multiple transactions at prices ranging from $15.43 to $15.60, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote. /s/ Steve Putman, attorney-in-fact for Thomas L. Carter, Jr. 2023-05-08