X0306 4 2020-03-12 0001172358 DORCHESTER MINERALS, L.P. DMLP 0001049123 MCMANEMIN WILLIAM CASEY 3838 OAK LAWN AVE SUITE 300 DALLAS TX 75219 1 1 Chief Executive Officer Common Units 2020-03-12 4 P 0 1333 10.33 A 467803 I See footnote Common Units 5531 I See footnote Common Units 53224 I See footnote Common Units 731481 D Held by 1307, Ltd. Mr. McManemin disclaims beneficial ownership of those common units owned by 1307, Ltd. in which he does not have a pecuniary interest. Mr. McManemin is the sole manager of Cabana Management LLC, the sole general partner of 1307, Ltd. Held by SAM Partners Management, Inc. Mr. McManemin disclaims beneficial ownership of those common units owned by SAM Partners Management, Inc. in which he does not have a pecuniary interest. Mr. McManemin is the Vice President and a shareholder of SAM Partners Management, Inc. Held by Smith Allen Oil & Gas, LLP. Mr. McManemin disclaims beneficial ownership of those common units owned by Smith Allen Oil & Gas, LLP in which he does not have a pecuniary interest. Mr. McManemin is the Vice President and a shareholder of Smith Allen Oil & Gas, LLP. /s/ William Casey McManemin 2020-03-16