DMLP · Insider Trading
Dorchester Minerals LP
Every open-market purchase and sale reported by DMLP officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-19 | Leslie A Moriyama | Chief Financial Officer | Buy | +5,197 | +$147.08K |
| 2026-06-02 | DORCHESTER MINERALS OPERATING LP | — | Buy | +7,500 | +$206.72K |
| 2026-05-22 | DORCHESTER MINERALS OPERATING LP | — | Buy | +7,500 | +$212.28K |
| 2026-05-12 | Bradley J Ehrman | Chief Executive Officer | Buy | +4,000 | +$107.12K |
| 2026-02-13 | DORCHESTER MINERALS OPERATING LP | — | Buy | +20,000 | +$504.75K |
| 2025-12-23 | DORCHESTER MINERALS OPERATING LP | — | Buy | +15,000 | +$334.12K |
| 2025-12-19 | DORCHESTER MINERALS OPERATING LP | — | Buy | +20,000 | +$445.22K |
| 2025-12-17 | Leslie A Moriyama | Chief Financial Officer | MIXED | +2,595 | — |
| 2025-12-17 | Bradley J Ehrman | Chief Executive Officer | MIXED | +3,008 | — |
| 2025-12-05 | Leslie A Moriyama | Chief Financial Officer | MIXED | +2,396 | — |
| 2025-12-05 | Bradley J Ehrman | Chief Executive Officer | MIXED | +3,061 | — |
| 2025-12-03 | Frank Damon Box | Director | Buy | +5,000 | +$109.83K |
| 2025-12-03 | Leslie A Moriyama | Chief Financial Officer | MIXED | +9,544 | +$206.44K |
| 2025-12-03 | Bradley J Ehrman | Chief Executive Officer | MIXED | +11,457 | +$247.81K |
| 2025-12-02 | DORCHESTER MINERALS OPERATING LP | — | J | −58,000 | −$1.27M |
| 2025-12-02 | Robert C Vaughn | Director | Buy | +195 | +$4.17K |
| 2025-11-28 | Leslie A Moriyama | Chief Financial Officer | Buy | +3,041 | +$65.38K |
| 2025-11-28 | Robert C Vaughn | Director | Buy | +4,615 | +$98.80K |
| 2025-11-26 | Bradley J Ehrman | Chief Executive Officer | Buy | +3,487 | +$74.98K |
| 2025-09-08 | Frank Damon Box | Director | Buy | +4,000 | +$102.28K |
| 2025-05-01 | DORCHESTER MINERALS OPERATING LP | — | Buy | +10,000 | +$287.60K |
| 2025-03-04 | Bradley J Ehrman | Chief Executive Officer | Buy | +3,356 | +$100.01K |
| 2025-02-07 | DORCHESTER MINERALS OPERATING LP | — | Buy | +335 | +$10.41K |
| 2025-02-04 | DORCHESTER MINERALS OPERATING LP | — | Buy | +14,000 | +$438.52K |
| 2024-12-30 | DORCHESTER MINERALS OPERATING LP | — | Buy | +954 | +$31.66K |
| 2024-12-26 | DORCHESTER MINERALS OPERATING LP | — | Buy | +10,500 | +$340.83K |
| 2024-12-17 | Bradley J Ehrman | Chief Executive Officer | MIXED | +2,866 | — |
| 2024-12-17 | Bradley J Ehrman | Chief Executive Officer | A | +14,430 | — |
| 2024-12-17 | Leslie A Moriyama | Chief Financial Officer | A | +12,050 | — |
| 2024-12-17 | Leslie A Moriyama | Chief Financial Officer | MIXED | +2,725 | — |
| 2024-12-12 | DORCHESTER MINERALS OPERATING LP | — | Buy | +22,000 | +$725.30K |
| 2024-12-05 | Leslie A Moriyama | Chief Financial Officer | MIXED | +6,507 | +$223.91K |
| 2024-12-05 | DORCHESTER MINERALS OPERATING LP | — | J | −66,124 | −$2.28M |
| 2024-12-05 | Bradley J Ehrman | Chief Executive Officer | MIXED | +8,751 | +$301.12K |
| 2024-11-15 | Leslie A Moriyama | Chief Financial Officer | Buy | +3,218 | +$104.91K |
| 2024-07-23 | DORCHESTER MINERALS OPERATING LP | — | Buy | +2,900 | +$93.46K |
| 2024-07-18 | DORCHESTER MINERALS OPERATING LP | — | Buy | +4,878 | +$158.00K |
| 2024-06-18 | Bradley J Ehrman | Chief Executive Officer | Buy | +2,800 | +$82.60K |
| 2024-05-23 | DORCHESTER MINERALS OPERATING LP | — | Buy | +10,000 | +$316.86K |
| 2024-05-20 | Leslie A Moriyama | Chief Financial Officer | Buy | +2,430 | +$77.14K |
| 2024-04-11 | William Casey McManemin | Chairman of the Board | G | −25,000 | — |
| 2024-02-21 | Bradley J Ehrman | Chief Executive Officer | A | +14,180 deriv. | — |
| 2024-02-21 | Leslie A Moriyama | Chief Financial Officer | A | +13,052 deriv. | — |
| 2024-02-05 | DORCHESTER MINERALS OPERATING LP | — | Buy | +1,275 | +$39.40K |
| 2024-02-01 | DORCHESTER MINERALS OPERATING LP | — | Buy | +5,000 | +$158.32K |
| 2024-01-29 | DORCHESTER MINERALS OPERATING LP | — | Buy | +7,500 | +$250.98K |
| 2023-12-27 | DORCHESTER MINERALS OPERATING LP | — | Buy | +4,920 | +$156.96K |
| 2023-12-22 | DORCHESTER MINERALS OPERATING LP | — | Buy | +8,506 | +$270.98K |
| 2023-12-21 | DORCHESTER MINERALS OPERATING LP | — | Buy | +21,306 | +$669.63K |
| 2023-12-18 | Bradley J Ehrman | Chief Executive Officer | MIXED | +10,727 | +$332.86K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Bradley J Ehrman | Chief Executive Officer | 157,915 | $4.34M |
| Leslie A Moriyama | Chief Financial Officer | 103,405 | $2.84M |
| DORCHESTER MINERALS OPERATING LP | — | 66,016 | $1.81M |
| Robert C Vaughn | Director | 40,547 | $1.11M |
| Frank Damon Box | Director | 9,000 | $247.14K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the DMLP quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.