Dorchester Minerals (DMLP) CFO buys 5,197 units at $28.30

Rhea-AI Filing Summary

DORCHESTER MINERALS, L.P. (DMLP) reported that its Chief Financial Officer, Leslie A. Moriyama, purchased 5,197 Common Units on 2026-08-19 at a price of $28.30 per unit in an open-market or private transaction. Following this purchase, Moriyama beneficially owns 103,405 Common Units, held in her individual name, jointly with her spouse, or in her Individual Retirement Account.

Insider Trade Summary

Net Buyer: 5,197 shares

Net Buy 1 txn

Insider MORIYAMA LESLIE A

Role Chief Financial Officer

Bought 5,197 shs ($147K)

Type	Security	Shares	Price	Value
Purchase	Common Units F1	5,197	$28.30	$147K

Holdings After Transaction: Common Units — 103,405 shares (Direct)

Footnotes (1)

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

Key Figures

Units Purchased: 5,197 Common Units Purchase Price: $28.30 per unit Units Owned After Transaction: 103,405 Common Units +2 more

5 metrics

Units Purchased 5,197 Common Units Non-derivative purchase by CFO on 2026-08-19

Purchase Price $28.30 per unit Price for the 5,197 Common Units acquired

Units Owned After Transaction 103,405 Common Units Total beneficial ownership by CFO following the purchase

Net Buy Shares 5,197 Common Units Net buy from transaction summary for this Form 4

Buy Transactions Count 1 Number of reported purchase transactions in this filing

Key Terms

Common Units, non-derivative, Individual Retirement Account, beneficially owns

4 terms

Common Units financial

"purchased 5,197 Common Units on 2026-08-19 at a price of $28.30"

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.

non-derivative financial

"The transaction was reported as a non-derivative purchase of Common Units"

Individual Retirement Account financial

"held in her individual name, jointly with her spouse or in her Individual Retirement Account"

beneficially owns financial

"Following this purchase, Moriyama beneficially owns 103,405 Common Units"

Beneficially owns means a person or entity enjoys the economic benefits and control of a security even if the legal title or registration is held in another name. Think of it like having the keys and profits from a car that is registered to a friend: you use it, benefit from it, and make decisions about it even though the official paperwork lists someone else. For investors, this matters because it reveals who truly controls shares, affects voting power, potential conflicts of interest, and regulatory disclosure obligations.

FAQ

What insider transaction did DMLP report for CFO Leslie A. Moriyama?

DMLP reported that CFO Leslie A. Moriyama purchased 5,197 Common Units on 2026-08-19. The transaction was coded as a purchase in an open market or private transaction, increasing her reported beneficial ownership in the partnership.

How many DMLP units did the CFO buy and at what price?

CFO Leslie A. Moriyama bought 5,197 Common Units of DMLP at $28.30 per unit. This was reported as a non-derivative transaction, indicating a direct acquisition of the Common Units rather than through options or other derivative securities.

What is Leslie A. Moriyama’s total DMLP ownership after this transaction?

After the reported purchase, Leslie A. Moriyama beneficially owns 103,405 Common Units of DMLP. According to the disclosure, these units are held in her individual name, jointly with her spouse, or in her Individual Retirement Account, all treated as direct ownership.

Was the DMLP CFO’s unit purchase made under a Rule 10b5-1 trading plan?

The transaction was not reported as made under a Rule 10b5-1 trading plan, as the filing’s 10b5-1 checkbox was not marked as affirming such a plan. The disclosure therefore treats this as a regular open-market or private purchase.

How is the nature of ownership described for the DMLP units held by the CFO?

The filing states that the reported Common Units are held by Leslie A. Moriyama in her individual name, jointly with her spouse, or in her Individual Retirement Account. All such holdings are treated as direct ownership for reporting purposes in this Form 4.

Did the DMLP CFO sell any units in this Form 4 filing?

No. The filing reports only a purchase of 5,197 Common Units by the CFO and shows no sales or dispositions. Transaction summary data indicates a net-buy position of 5,197 units with zero reported sale transactions in this report.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/19/2026 - 04:15 PM Accepted by SEC EDGAR 08/19/2026 - 04:14 PM Learn about SEC filing dates

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^*

MORIYAMA LESLIE A

(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
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/19/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Units	08/19/2026		P		5,197	A	$28.3	103,405	D(1)

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. These common units are held by Ms. Moriyama in her individual name, jointly with her spouse or in her Individual Retirement Account.

	/s/ Leslie A. Moriyama	08/19/2026
	** 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)