Dorchester Minerals, L.P. (DMLP) affiliate buys 7,500 common units

Filing Impact

(Moderate)

Filing Sentiment

(Positive)

Form Type

Rhea-AI Filing Summary

DORCHESTER MINERALS OPERATING LP, an entity under common control with DORCHESTER MINERALS, L.P., reported open-market purchases of a total of 7,500 Common Units of Dorchester Minerals, L.P. on June 1, 2026.

The units were bought in three transactions of 4,001, 999, and 2,500 Common Units at prices of $27.50, $27.62, and $27.64 per unit, respectively. The transactions were executed pursuant to a Rule 10b5-1 trading plan adopted on November 12, 2025.

Insider Trade Summary 10b5-1

Net Buyer: 7,500 shares ($206,720)

Net Buy 3 txns

Insider DORCHESTER MINERALS OPERATING LP

Role null

Bought 7,500 shs ($207K)

Type	Security	Shares	Price	Value
Purchase	Common Units	2,500	$27.64	$69K
Purchase	Common Units	999	$27.62	$28K
Purchase	Common Units	4,001	$27.50	$110K

Holdings After Transaction: Common Units — 65,017 shares (Direct, null)

Footnotes (1)

[object Object]

Key Figures

Total units purchased: 7,500 Common Units First trade size and price: 4,001 units at $27.50 Second trade size and price: 999 units at $27.62 +2 more

5 metrics

Total units purchased 7,500 Common Units Open-market purchases on June 1, 2026

First trade size and price 4,001 units at $27.50 Common Units open-market purchase

Second trade size and price 999 units at $27.62 Common Units open-market purchase

Third trade size and price 2,500 units at $27.64 Common Units open-market purchase

10b5-1 plan adoption date 11-12-2025 Plan governing these purchases

Key Terms

Common Units, open-market purchase, Rule 10b5-1 plan

3 terms

Common Units financial

"security_title: "Common Units" for all reported transactions"

Common units are the basic ownership stakes in a company, limited partnership, or trust that function like common stock: they give holders a claim on profits and often voting rights. Think of them as the ordinary seats at a table—the most directly affected by the business’s success or failure, so they typically offer higher upside but carry greater risk than preferred claims or creditors, which matters to investors evaluating potential return and safety.

open-market purchase financial

"transaction_action: "open-market purchase" for each trade"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Rule 10b5-1 plan regulatory

"footnote: "Adoption date of referenced 10b5-1 plan is: 11-12-2025""

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

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Form 4 Insider Transactions: What Each Field Means →

06/02/2026 - 05:04 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

DORCHESTER MINERALS OPERATING LP

(Last)

(First)

(Middle)

3838 OAK LAWN AVE

SUITE 300

(Street)

DALLAS

TEXAS

75219

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
DORCHESTER MINERALS, L.P. [ DMLP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director		10% Owner
Officer (give title below)	X	Other (specify below)
		Entity Under Common Control

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Units	06/01/2026		P⁽¹⁾		2,500	A	$27.64	65,017	D
Common Units	06/01/2026		P⁽¹⁾		999	A	$27.62	66,016	D
Common Units	06/01/2026		P⁽¹⁾		4,001	A	$27.5	70,017	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Adoption date of referenced 10b5-1 plan is: 11-12-2025

	/s/ Leslie A. Moriyama	06/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider activity did DMLP report in this Form 4 filing?

The filing shows Dorchester Minerals Operating LP bought a total of 7,500 Common Units of Dorchester Minerals, L.P. These were open-market purchases executed in three separate transactions on June 1, 2026, at prices slightly above $27 per unit.

How many Dorchester Minerals (DMLP) units were purchased and at what prices?

Dorchester Minerals Operating LP purchased 7,500 Common Units in total. The buys were 4,001 units at $27.50, 999 units at $27.62, and 2,500 units at $27.64 per unit, all classified as open-market purchases on June 1, 2026.

Who is the reporting person in the DMLP Form 4 and what was traded?

The reporting person is Dorchester Minerals Operating LP, described as an entity under common control with Dorchester Minerals, L.P. It reported buying non-derivative Common Units of Dorchester Minerals, L.P. in open-market transactions, totaling 7,500 units on June 1, 2026.

Were Dorchester Minerals (DMLP) insider purchases made under a 10b5-1 plan?

Yes. A footnote states the transactions were tied to a Rule 10b5-1 trading plan adopted on November 12, 2025. Such pre-arranged plans automate trades according to preset instructions, indicating these June 1, 2026 purchases were scheduled in advance.

What type of securities did Dorchester Minerals Operating LP buy in this Form 4?

The entity bought non-derivative Common Units of Dorchester Minerals, L.P. All reported transactions involved Common Units rather than options or other derivatives, and each was coded as an open-market purchase with direct ownership reported after the trades.