Mach Natural Resources LP (MNR) insiders lift stake with 30,000-unit purchase

Rhea-AI Filing Summary

Mach Natural Resources LP reported insider purchases by major unitholders affiliated with Bayou City Energy. On 12/08/2025, BCE-Mach Aggregator LLC bought 12,500 common units at a weighted average price of $12.53. On 12/09/2025, it bought an additional 17,500 common units at a weighted average price of $12.32, for a total of 30,000 units acquired over two days. After these transactions, the filing shows 74,850,632 common units beneficially owned indirectly. The units are held primarily by BCE-Mach Aggregator LLC and a smaller amount by Bayou City Energy Management LLC, which indirectly manages the aggregator. Managing Partner William W. McMullen may be deemed to share beneficial ownership but disclaims ownership beyond his pecuniary interest.

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

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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^*

McMullen William Wallace

(Last) (First) (Middle)

14201 WIRELESS WAY SUITE 300

(Street)

OKLAHOMA CITY OK 73134

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MACH NATURAL RESOURCES LP [ MNR ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
12/08/2025

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

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

	Form filed by One Reporting Person
X	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	12/08/2025		P		12,500(1)	A	$12.53(2)	74,833,132(4)	I	See footnote(4)
Common Units	12/09/2025		P		17,500(1)	A	$12.32(3)	74,850,632(4)	I	See footnote(4)

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

1. Name and Address of Reporting Person^*

McMullen William Wallace

(Last) (First) (Middle)

14201 WIRELESS WAY SUITE 300

(Street)

OKLAHOMA CITY OK 73134

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

BCE-Mach Aggregator LLC

(Last) (First) (Middle)

C/O BAYOU CITY ENERGY, L.P.

2229 SAN FELIPE STREET, SUITE 1075

(Street)

HOUSTON TX 77019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

BAYOU CITY ENERGY MANAGEMENT LLC

(Last) (First) (Middle)

C/O BAYOU CITY ENERGY, L.P.

2229 SAN FELIPE STREET, SUITE 1075

(Street)

HOUSTON TX 77019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

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

Explanation of Responses:

1. These common units were purchased by BCE-Mach Aggregator LLC ("BCE Aggregator").

2. The price reported in Column 4 is a weighted average price. These common units were purchased by BCE Aggregator in multiple transactions at prices ranging from $12.44 to $12.67, inclusive. The Reporting Persons undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote (2) to this Form 4.

3. The price reported in Column 4 is a weighted average price. These common units were purchased by BCE Aggregator in multiple transactions at prices ranging from $12.30 to $12.35, inclusive. The Reporting Persons undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of common units purchased at each separate price within the ranges set forth in this footnote (3) to this Form 4.

4. After the reported transactions, the reported common units are directly held 74,835,939 by BCE Aggregator and 14,693 by Bayou City Energy Management LLC ("BCEM"). BCE Aggregator is indirectly managed by BCEM. William W. McMullen is the Managing Partner of BCEM. Accordingly, each of the Reporting Persons may be deemed to beneficially own the securities directly held by BCE Aggregator and BCEM, as applicable, but disclaim beneficial ownership of such common units except to the extent of their respective pecuniary interest therein.

Remarks:

The Reporting Person is a Director of Mach Natural Resources GP LLC, the general partner of the Issuer (the "General Partner"). The Issuer is managed by the directors and executive officers of the General Partner.

	BCE-Mach Aggregator LLC, By: /s/ William W. McMullen, Name: William W. McMullen, Title: Authorized Signatory	12/10/2025
	Bayou City Energy Management LLC, By: /s/ William W. McMullen, Name: William W. McMullen, Title: Managing Partner	12/10/2025
	William W. McMullen, By: /s/ William W. McMullen	12/10/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did Mach Natural Resources LP (MNR) report in this Form 4?

The filing reports that BCE-Mach Aggregator LLC purchased 12,500 common units of Mach Natural Resources LP on 12/08/2025 at a weighted average price of $12.53, and 17,500 common units on 12/09/2025 at a weighted average price of $12.32.

How many Mach Natural Resources LP (MNR) units are beneficially owned after these trades?

After the reported transactions, the Form 4 shows 74,850,632 common units of Mach Natural Resources LP beneficially owned indirectly by the reporting persons.

Who are the reporting persons in this Mach Natural Resources LP (MNR) Form 4?

The reporting group includes BCE-Mach Aggregator LLC, Bayou City Energy Management LLC (BCEM), and William W. McMullen, who is the Managing Partner of BCEM and an authorized signatory for BCE-Mach Aggregator LLC.

What is the relationship of the reporting persons to Mach Natural Resources LP (MNR)?

The reporting persons are identified as a Director, a 10% owner, and, in the case of one reporting person, an “Other” related party as described in the remarks. The remarks state that the reporting person is a director of Mach Natural Resources GP LLC, the general partner of the issuer.

How are the Mach Natural Resources LP (MNR) units held by the reporting persons structured?

According to the footnotes, the reported common units are held directly as 74,835,939 units by BCE-Mach Aggregator LLC and 14,693 units by Bayou City Energy Management LLC, with BCEM indirectly managing the aggregator.

Do the reporting persons claim full beneficial ownership of the Mach Natural Resources LP (MNR) units?

The filing states that each reporting person may be deemed to beneficially own the securities held by BCE-Mach Aggregator LLC and BCEM, but they disclaim beneficial ownership of such common units except to the extent of their respective pecuniary interest.

Were the Mach Natural Resources LP (MNR) purchases made in multiple trades?

Yes. The footnotes explain that each day’s reported price is a weighted average. On 12/08/2025, units were bought in multiple transactions between $12.44 and $12.67. On 12/09/2025, trades occurred between $12.30 and $12.35.