Dorchester Minerals, L.P. Announces the Retirement of Mr. William Casey McManemin from the Board of Managers; Appointments of Mr. Robert C. Vaughn as Interim Chairman and Mr. Albert G. Nance III to the Board of Managers

Core Viewpoint - Dorchester Minerals, L.P. announces the retirement of Mr. William Casey McManemin from the Board of Managers effective December 31, 2025, after over 37 years of service to the organization [1][2]. Group 1: Leadership Transition - Mr. McManemin served as CEO for over 19 years and has been a member and Chairman of the Board since the Partnership's inception in 2003 [2]. - Mr. Bradley Ehrman, the current CEO, emphasized Mr. McManemin's significant contributions and leadership in shaping the foundation of Dorchester Minerals [3]. - Mr. Robert C. Vaughn, a current Board member and co-founder, has been appointed as Interim Chairman, ensuring continuity in governance during the transition [4]. Group 2: Recognition and Future Commitment - The Board has named Mr. McManemin Chairman Emeritus, an honorary title reflecting his ongoing commitment to the Partnership [3]. - Mr. McManemin expressed gratitude for the trust and support from partners and reaffirmed his personal and financial commitment to the Partnership's strategy despite stepping away from official duties [4]. Group 3: New Board Appointment - In connection with Mr. McManemin's retirement, Mr. Albert G. Nance III has been appointed to the Board of Managers effective January 1, 2026, bringing over 38 years of oil and gas experience [4].