DMLP

SEC source: 0001437749-26-028537 · rdgdoc.xml · nonDerivative · entry 1

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,405

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her Individual Retirement Account.

SEC source: 0001437749-26-019186 · rdgdoc.xml · nonDerivative · entry 3

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-26-019186 · rdgdoc.xml · nonDerivative · entry 2

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 66,016

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-26-019186 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 65,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-26-018250 · rdgdoc.xml · nonDerivative · entry 2

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,517

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-26-018250 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 56,517

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-26-016382 · rdgdoc.xml · nonDerivative · entry 1

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · .

Disclosed balance after: 142,723

F1 · ownership.direct: These common units are held by Quiscalus Ventures, LLC, in which Mr. Ehrman is the sole member.

F2 · ownership.direct: On December 31, 2025, the reporting person received 17,526 units from Bradley J. Ehrman in a transaction exempt from reporting pursuant to Rule 16a-13.

SEC source: 0001437749-26-004085 · rdgdoc.xml · nonDerivative · entry 3

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 55,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-26-004085 · rdgdoc.xml · nonDerivative · entry 2

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 50,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-26-004085 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 45,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-25-038623 · rdgdoc.xml · nonDerivative · entry 2

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 35,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-25-038623 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 25,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-25-038416 · rdgdoc.xml · nonDerivative · entry 2

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 20,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-25-038416 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 4,288

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-12-2025

SEC source: 0001437749-25-038194 · rdgdoc.xml · derivative · entry 3

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,350

Underlying: Common Units · 4,351 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Notional Units granted on December 15, 2023, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 15, 2024. Vested Notional Units are settled within 60 days after the date on which they vest.

F3 · derivative.exercise_date: Notional Units granted on December 15, 2023, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 15, 2024. Vested Notional Units are settled within 60 days after the date on which they vest.

F3 · derivative.expiration_date: Notional Units granted on December 15, 2023, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 15, 2024. Vested Notional Units are settled within 60 days after the date on which they vest.

SEC source: 0001437749-25-038194 · rdgdoc.xml · nonDerivative · entry 2

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,208

F2 · kind: Represents payment of tax liability incident to the grant of common units awarded to the reporting person on December 15, 2025 pursuant to an equity incentive plan, by withholding common units from such grant.

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her Individual Retirement Account.

SEC source: 0001437749-25-038194 · rdgdoc.xml · nonDerivative · entry 1

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 99,964

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her Individual Retirement Account.

SEC source: 0001437749-25-038191 · rdgdoc.xml · derivative · entry 4

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,726

Underlying: Common Units · 4,727 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Notional Units granted on December 15, 2023, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 15, 2024. Vested Notional Units are settled within 60 days after the date on which they vest.

F4 · derivative.exercise_date: Notional Units granted on December 15, 2023, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 15, 2024. Vested Notional Units are settled within 60 days after the date on which they vest.

F4 · derivative.expiration_date: Notional Units granted on December 15, 2023, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 15, 2024. Vested Notional Units are settled within 60 days after the date on which they vest.

SEC source: 0001437749-25-038191 · rdgdoc.xml · nonDerivative · entry 3

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,718

F3 · kind: Represents payment of tax liability incident to the grant of common units awarded to the reporting person on December 15, 2025 pursuant to an equity incentive plan, by withholding common units from such grant.

F2 · ownership.direct: These common units are held by Mr. Ehrman in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-038191 · rdgdoc.xml · nonDerivative · entry 2

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,437

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · ownership.direct: These common units are held by Mr. Ehrman in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-036817 · rdgdoc.xml · nonDerivative · entry 1

Box Frank Damon · CIK 0002042162 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,000

F1 · ownership.direct: These common units are held by Mr. Box jointly with his spouse.

SEC source: 0001437749-25-037042 · rdgdoc.xml · derivative · entry 3

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,033

Underlying: Common Units · 4,017 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Notional Units granted on December 3, 2024, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 3, 2025. Vested Notional Units are settled within 60 days after the date on which they vest.

F3 · derivative.exercise_date: Notional Units granted on December 3, 2024, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 3, 2025. Vested Notional Units are settled within 60 days after the date on which they vest.

F3 · derivative.expiration_date: Notional Units granted on December 3, 2024, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 3, 2025. Vested Notional Units are settled within 60 days after the date on which they vest.

SEC source: 0001437749-25-037042 · rdgdoc.xml · nonDerivative · entry 2

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,613

F2 · kind: Represents payment of tax liability incident to the grant of common units awarded to the reporting person on December 3, 2025 pursuant to an equity incentive plan, by withholding common units from such grant.

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her Individual Retirement Account.

SEC source: 0001437749-25-037042 · rdgdoc.xml · nonDerivative · entry 1

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,234

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her Individual Retirement Account.

SEC source: 0001437749-25-037040 · rdgdoc.xml · derivative · entry 4

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,620

Underlying: Common Units · 4,810 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Notional Units granted on December 3, 2024, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 3, 2025. Vested Notional Units are settled within 60 days after the date on which they vest.

F4 · derivative.exercise_date: Notional Units granted on December 3, 2024, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 3, 2025. Vested Notional Units are settled within 60 days after the date on which they vest.

F4 · derivative.expiration_date: Notional Units granted on December 3, 2024, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 3, 2025. Vested Notional Units are settled within 60 days after the date on which they vest.

SEC source: 0001437749-25-037040 · rdgdoc.xml · nonDerivative · entry 2

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,710

F3 · kind: Represents payment of tax liability incident to the grant of common units awarded to the reporting person on December 3, 2025 pursuant to an equity incentive plan, by withholding common units from such grant.

F2 · ownership.direct: These common units are held by Mr. Ehrman in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-037040 · rdgdoc.xml · nonDerivative · entry 1

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,459

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · ownership.direct: These common units are held by Mr. Ehrman in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-036813 · rdgdoc.xml · derivative · entry 4

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,000

Underlying: Common Units · 18,000 shares

Expires not disclosed

F4 · derivative.exercise_price: Notional Units granted on December 1, 2025, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 1, 2026. Vested Notional Units are settled within 60 days after the date on which they vest.

F4 · derivative.exercise_date: Notional Units granted on December 1, 2025, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 1, 2026. Vested Notional Units are settled within 60 days after the date on which they vest.

F4 · derivative.expiration_date: Notional Units granted on December 1, 2025, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 1, 2026. Vested Notional Units are settled within 60 days after the date on which they vest.

SEC source: 0001437749-25-036813 · rdgdoc.xml · nonDerivative · entry 2

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,649

F3 · kind: Represents payment of tax liability incident to the grant of common units awarded to the reporting person on December 1, 2025 pursuant to an equity incentive plan, by withholding common units from such grant.

F2 · ownership.direct: These common units are held by Mr. Ehrman in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-036813 · rdgdoc.xml · nonDerivative · entry 1

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,192

F2 · ownership.direct: These common units are held by Mr. Ehrman in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-036815 · rdgdoc.xml · derivative · entry 3

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,000

Underlying: Common Units · 16,000 shares

Expires not disclosed

F3 · derivative.exercise_price: Notional Units granted on December 1, 2025, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 1, 2026. Vested Notional Units are settled within 60 days after the date on which they vest.

F3 · derivative.exercise_date: Notional Units granted on December 1, 2025, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 1, 2026. Vested Notional Units are settled within 60 days after the date on which they vest.

F3 · derivative.expiration_date: Notional Units granted on December 1, 2025, pursuant to the Dorchester Minerals Management LP Equity Incentive program. Each Notional Unit entitles the holder to receive either (1) the number of common units representing limited partnership interests in Dorchester Minerals, L.P. (the "Common Units") equal to the number of Notional Units that become vested or (2) the cash equivalent at the time of vesting of the number of Common Units equal to the number of Notional Units that become vested. One-third of the Notional Units vest on each anniversary of the date of the award agreement over a three year period beginning on December 1, 2026. Vested Notional Units are settled within 60 days after the date on which they vest.

SEC source: 0001437749-25-036815 · rdgdoc.xml · nonDerivative · entry 2

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,217

F2 · kind: Represents payment of tax liability incident to the grant of common units awarded to the reporting person on December 1, 2025 pursuant to an equity incentive plan, by withholding common units from such grant.

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her individual retirement account.

SEC source: 0001437749-25-036815 · rdgdoc.xml · nonDerivative · entry 1

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 99,673

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her individual retirement account.

SEC source: 0001437749-25-036677 · rdgdoc.xml · nonDerivative · entry 1

VAUGHN ROBERT C · CIK 0001203847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,547

F1 · ownership.direct: These common units are held by Mr. Vaughn in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-036675 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17

F1 · kind: Pro rata distribution to its general and limited partners.

SEC source: 0001437749-25-036433 · rdgdoc.xml · nonDerivative · entry 2

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · .

Disclosed balance after: 121,197

F1 · ownership.direct: These common units are held by Quiscalus Ventures, LLC, in which Mr. Ehrman is the sole member.

SEC source: 0001437749-25-036433 · rdgdoc.xml · nonDerivative · entry 1

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · .

Disclosed balance after: 118,710

F1 · ownership.direct: These common units are held by Quiscalus Ventures, LLC, in which Mr. Ehrman is the sole member.

SEC source: 0001437749-25-036481 · rdgdoc.xml · nonDerivative · entry 2

VAUGHN ROBERT C · CIK 0001203847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,352

F1 · ownership.direct: These common units are held by Mr. Vaughn in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-036481 · rdgdoc.xml · nonDerivative · entry 1

VAUGHN ROBERT C · CIK 0001203847 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,000

F1 · ownership.direct: These common units are held by Mr. Vaughn in his individual name, IRA or Keogh Plan.

SEC source: 0001437749-25-036479 · rdgdoc.xml · nonDerivative · entry 1

MORIYAMA LESLIE A · CIK 0001642865 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83,673

F1 · ownership.direct: These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her Individual Retirement Account.

SEC source: 0001437749-25-028545 · rdgdoc.xml · nonDerivative · entry 1

Box Frank Damon · CIK 0002042162 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,000

F1 · ownership.direct: These common units are held by Mr. Box jointly with his spouse.

SEC source: 0001437749-25-014101 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 58,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024

SEC source: 0001437749-25-006175 · rdgdoc.xml · nonDerivative · entry 1

EHRMAN BRADLEY J · CIK 0001642868 · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · .

Disclosed balance after: 117,710

F2 · balance_after: On 01-08-2025, the reporting person received 11,617 common units from Bradley J Ehrman in a transaction exempt from reporting pursuant to Rule 16a-13.

F1 · ownership.direct: These common units are held by Quiscalus Ventures, LLC, in which Mr. Ehrman is the sole member.

SEC source: 0001437749-25-003192 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 48,017

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024

SEC source: 0001437749-25-002790 · rdgdoc.xml · nonDerivative · entry 2

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 47,682

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024

SEC source: 0001437749-25-002790 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 41,182

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024

SEC source: 0001437749-24-038558 · rdgdoc.xml · nonDerivative · entry 3

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 33,682

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024

SEC source: 0001437749-24-038558 · rdgdoc.xml · nonDerivative · entry 2

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 33,678

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024

SEC source: 0001437749-24-038558 · rdgdoc.xml · nonDerivative · entry 1

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 32,738

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024

SEC source: 0001437749-24-038420 · rdgdoc.xml · nonDerivative · entry 4

DORCHESTER MINERALS OPERATING LP · CIK 0001646289 · Entity Under Common Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 32,728

F1 · kind: Adoption date of referenced 10b5-1 plan is: 11-05-2024