X0306 4 2019-05-24 0 0001621434 Black Stone Minerals, L.P. BSM 0001638374 Thacker Allison K. 1001 FANNIN STREET, SUITE 2020 HOUSTON TX 77002 1 0 0 0 Common units representing limited partner interests 2019-05-24 4 C 0 11396 A 67199 D Common units representing limited partner interests 25000 I By The Troy and Allison Thacker Family Trust Subordinated units representing limited partner interests 2019-05-24 4 C 0 11396 D Common units representing limited partner interests 11396 0 D On May 24, 2019, each subordinated unit representing limited partner interests in the Issuer converted into one common unit representing limited partner interests in the Issuer pursuant to the terms of the Issuer's First Amended and Restated Agreement of Limited Partnership, as amended. /s/ Steve Putman, attorney-in-fact for Allison K. Thacker 2019-05-29