X0306 4 2019-01-11 0 0001621434 Black Stone Minerals, L.P. BSM 0001636921 Longmaid John H. 1001 FANNIN STREET, SUITE 2020 HOUSTON TX 77002 1 0 0 0 Common units representing limited partner interests 2019-01-11 4 A 0 10842 0.00 A 0 D Common units representing limited partner interests 1089188 I By The Longmaid Family Trust Common units representing limited partner interests 353652 I By John H. Longmaid 1965 Trust Common units representing limited partner interests 219479 I By John H. Longmaid 1968 Trust In a previous transaction that was not reportable on Form 4, Mr. Longmaid transferred 9,536 common units owned directly to The Longmaid Family Trust. In a transaction subsequent to this year's award of 10,842 common units but prior to the date of this report, Mr. Longmaid transferred 10,842 common units owned directly to The Longmaid Family Trust. /s/ Steve Putman, Attorney-in-Fact for John H. Longmaid 2019-01-14