DORCHESTER MINERALS OPERATING LP - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
DORCHESTER MINERALS OPERATING LP has filed 2 SEC Form 4 filings across 1 company in the last 90 days - buying. Lifetime open-market purchases: $2.31M. Historical track record: 4/5 stars across 22 tracked purchases.
Profile
DORCHESTER MINERALS OPERATING LP is an investment firm that reports beneficial ownership of shares in DORCHESTER MINERALS, L.P. (DMLP) under U.S. securities law. It has submitted 9 SEC insider filings since 2024, most recently in June 2026.
| Filer type | Fund |
|---|---|
| Role | Insider |
| Notability | 20/100 |
Board memberships
- DORCHESTER MINERALS, L.P.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realised performance after each tracked open-market purchase.
| InsiderAlpha rating | ★★★★☆ (4/5) |
|---|---|
| Total purchases tracked | 22 |
| Purchases with forward-return data | 22 |
| 30-day win rate | 77% |
| 90-day win rate | 14% |
| Avg 5-day return | +0.66% |
| Avg 30-day return | +1.55% |
| Avg 90-day return | -6.01% |
| Best 30-day return | +8.01% |
Trading Pattern
InsiderAlpha's records for DORCHESTER MINERALS OPERATING LP go back to 2024: 9 primary Form 4 filings, an average of 3.0 per year. The typical open-market purchase is $86K (27 buys totaling $2.31M). The largest single buy on record is $288K of DMLP in 2025. 26 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role DORCHESTER MINERALS OPERATING LP has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Insider at DORCHESTER MINERALS, L.P. (DMLP) - 9 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-02 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 4.0K | $27.50 | $110K |
| 2026-06-02 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 999 | $27.62 | $28K |
| 2026-06-02 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 2.5K | $27.64 | $69K |
| 2026-05-22 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 6.0K | $28.32 | $170K |
| 2026-05-22 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 1.5K | $28.24 | $42K |
| 2026-02-13 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 5.0K | $25.29 | $126K |
| 2026-02-13 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 5.0K | $25.08 | $125K |
| 2026-02-13 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 10.0K | $25.29 | $253K |
| 2025-12-02 | DMLP | DORCHESTER MINERALS, L.P. | J - Other acquisition / disposition | 58.0K | $21.95 | $1.27M |
| 2025-05-01 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase | 10.0K | $28.76 | $288K |
| 2024-12-30 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 4 | $33.06 | $132 |
| 2024-12-30 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 940 | $33.19 | $31K |
| 2024-12-30 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 10 | $33.15 | $332 |
| 2024-12-27 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 4.0K | $32.86 | $131K |
| 2024-12-27 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 1.0K | $32.27 | $32K |
| 2024-12-27 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 3.0K | $32.20 | $97K |
| 2024-12-27 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 2.5K | $32.21 | $81K |
| 2024-12-12 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 1.0K | $32.84 | $33K |
| 2024-12-12 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 1.0K | $32.84 | $33K |
| 2024-12-12 | DMLP | DORCHESTER MINERALS, L.P. | P - Open-market purchase [10b5-1] | 3.0K | $32.85 | $99K |
Companies - Last 90 Days
- DORCHESTER MINERALS, L.P. (DMLP) - 2 filings, last 2026-06-02
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies DORCHESTER MINERALS OPERATING LP has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Frank Damon Box - $212K of DMLP open-market activity in the last 12 months
- Bradley J. Ehrman - $182K of DMLP open-market activity in the last 12 months
- Robert C. Vaughn - $103K of DMLP open-market activity in the last 12 months
- Leslie A. Moriyama - $65K of DMLP open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Robert W. Duggan
- John Earl
- EcoR1 Capital, LLC
- ECP ControlCo, LLC
- ECP Fiber Holdings GP, LLC
- Electrum Strategic Resources L.P.
- Ariel Emanuel
- Retirement System Of The State Of Hawaii Employees'
Frequently Asked Questions
What is DORCHESTER MINERALS OPERATING LP?
DORCHESTER MINERALS OPERATING LP is an investment firm that reports beneficial ownership of shares in DORCHESTER MINERALS, L.P. (DMLP) under U.S. securities law. It has submitted 9 SEC insider filings since 2024, most recently in June 2026.…
How many SEC Form 4 filings has DORCHESTER MINERALS OPERATING LP submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Has DORCHESTER MINERALS OPERATING LP been buying or selling stock?
Recorded transactions: 27 open-market purchases ($2.31M) and 0 open-market sales across all tracked filings.
How accurate is DORCHESTER MINERALS OPERATING LP's historical track record?
Across 22 tracked purchases, DORCHESTER MINERALS OPERATING LP averaged +1.6% avg 30-day return with a 77% 30-day win rate. InsiderAlpha rates the track record at 4/5 stars.
Where can I see all of DORCHESTER MINERALS OPERATING LP's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live DORCHESTER MINERALS OPERATING LP profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.