Black Stone Minerals director receives 1,309 units

Black Stone Minerals, L.P. director D. Mark DeWalch received 1,309 common units on October 2, 2026, in lieu of a cash retainer under a previous arrangement; the reported transaction price was $14.32 per unit.

Rhea-AI Filing Summary

Black Stone Minerals, L.P. director D. Mark DeWalch received 1,309 common units on October 2, 2026, in lieu of a cash retainer under a previous arrangement; the reported transaction price was $14.32 per unit. His direct holdings following the transaction were 434,146 units. Reported indirect holdings included 631,248 units through DeWalch Diversified LP, 40,809 through Donald Mark DeWalch Trust, and 6,749 held by his wife.

Insider Trade Summary

Grant/Award: 1,309 shares

Grant/Award 4 txns

Insider DeWalch D Mark

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common units representing limited partner interests F1	1,309	$14.32	$19K
holding	Common units representing limited partner interests	--	--	--
holding	Common units representing limited partner interests	--	--	--
holding	Common units representing limited partner interests	--	--	--

Holdings After Transaction: Common units representing limited partner interests — 434,146 shares (Direct); Common units representing limited partner interests — 631,248 shares (Indirect, By DeWalch Diversified LP); Common units representing limited partner interests — 40,809 shares (Indirect, By Donald Mark DeWalch Trust); Common units representing limited partner interests — 6,749 shares (Indirect, By wife)

Footnotes (1)

1. F1. Pursuant to a previous arrangement, the Reporting Person elected to receive common units in lieu of a cash retainer for service on the Board of Directors of the Partnership's General Partner.

Key Figures

Common units received: 1,309 units Reported transaction price: $14.32 per unit Direct holdings: 434,146 units +3 more

6 metrics

Common units received 1,309 units Received in lieu of a cash retainer on October 2, 2026

Reported transaction price $14.32 per unit Common units received on October 2, 2026

Direct holdings 434,146 units Following the transaction

Indirect holdings through DeWalch Diversified LP 631,248 units Reported holding

Indirect holdings through Donald Mark DeWalch Trust 40,809 units Reported holding

Indirect holdings held by his wife 6,749 units Reported holding

Key Terms

common units representing limited partner interests, cash retainer, Partnership's General Partner

3 terms

common units representing limited partner interests financial

"Common units representing limited partner interests"

cash retainer financial

"common units in lieu of a cash retainer"

Partnership's General Partner financial

"Board of Directors of the Partnership's General Partner"

FAQ

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How many common units did BSM director D. Mark DeWalch receive?

D. Mark DeWalch received 1,309 common units on October 2, 2026, in lieu of a cash retainer under a previous arrangement, at a reported transaction price of $14.32 per unit. No Rule 10b5-1 plan is reported.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/05/2026 - 04:55 PM Accepted by SEC EDGAR 10/05/2026 - 04:54 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^*

DeWalch D Mark

(Last) (First) (Middle)

1001 FANNIN STREET, SUITE 2020

(Street)

HOUSTON TEXAS 77002

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Black Stone Minerals, L.P. [ BSM ]

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/02/2026

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 representing limited partner interests	10/02/2026		A		1,309	A(1)	$14.32	434,146	D
Common units representing limited partner interests								631,248	I	By DeWalch Diversified LP
Common units representing limited partner interests								40,809	I	By Donald Mark DeWalch Trust
Common units representing limited partner interests								6,749	I	By wife

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. Pursuant to a previous arrangement, the Reporting Person elected to receive common units in lieu of a cash retainer for service on the Board of Directors of the Partnership's General Partner.

Remarks:

	/s/ Steve Putman, attorney-in-fact for D. Mark DeWalch	10/05/2026
	** 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)