Black Stone director adds 14,255 common units

Black Stone Minerals, L.P. director D. Mark DeWalch reported acquiring 14,255 common units representing limited partner interests on January 13, 2026.

Rhea-AI Filing Summary

Black Stone Minerals, L.P. director D. Mark DeWalch reported acquiring 14,255 common units representing limited partner interests on January 13, 2026. The units were acquired at a reported price of $0 per unit, bringing his directly held position to 392,605 common units following the transaction.

In addition to these directly held units, the filing lists indirect beneficial ownership of Black Stone Minerals common units, including 558,522 units held by DeWalch Diversified LP, 40,809 units held by the Donald Mark DeWalch Trust, and 6,749 units held by his wife.

Insider Trade Summary

Grant/Award: 14,255 shares

Grant/Award 4 txns

Insider DeWalch D Mark

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common units representing limited partner interests	14,255	$0.00	$0.00
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 — 392,605 shares (Direct); Common units representing limited partner interests — 558,522 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)

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did BSM director D. Mark DeWalch report?

The filing shows that director D. Mark DeWalch acquired 14,255 common units of Black Stone Minerals, L.P. on January 13, 2026 at a reported price of $0 per unit.

How many BSM common units does D. Mark DeWalch hold directly after this Form 4?

After the reported acquisition, D. Mark DeWalch directly holds 392,605 common units representing limited partner interests in Black Stone Minerals, L.P.

What indirect BSM holdings associated with D. Mark DeWalch are disclosed?

The report lists indirect beneficial ownership of 558,522 common units held by DeWalch Diversified LP, 40,809 units held by the Donald Mark DeWalch Trust, and 6,749 units held by his wife.

What security is involved in this BSM Form 4 filing?

All positions in the filing relate to common units representing limited partner interests of Black Stone Minerals, L.P.

What role does the reporting person hold at Black Stone Minerals (BSM)?

The reporting person, D. Mark DeWalch, is identified in the filing as a director of Black Stone Minerals, L.P.

Was there more than one reporting person in this BSM Form 4?

No. The Form 4 indicates it was filed by one reporting person, D. Mark DeWalch.

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

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Accepted by SEC EDGAR 01/15/2026 - 05:33 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 TX 77002

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
01/13/2026

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

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

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

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	01/13/2026		A		14,255	A	$0	392,605	D
Common units representing limited partner interests								558,522	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:

Remarks:

	/s/ Steve Putman, attorney-in-fact for D. Mark DeWalch	01/15/2026
	** 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.