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  4. [Form 4] Mach Natural Resources LP Insider Trading Activity

Mach Natural Resources Insider Purchase: 3,085 Units at $14.39

Filing Impact
(Neutral)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

On 08/11/2025 Bayou City Energy Management LLC ("BCEM") purchased 3,085 common units of Mach Natural Resources LP at a reported price of $14.39 per unit. The purchase was reported on Form 4 and signed on 08/12/2025.

After the transaction the filing shows aggregate beneficial ownership of 74,816,024 common units: 74,805,939 directly held by BCE-Mach Aggregator LLC and 10,085 directly held by BCEM. William W. McMullen is identified as Managing Partner of BCEM, a Director and a 10% owner, and therefore may be deemed to beneficially own the units held by those entities. The filing reports no derivative transactions.

Positive

  • Aggregate beneficial ownership disclosed: 74,816,024 common units held by reporting persons, showing a significant position
  • Insider purchase executed: BCEM purchased 3,085 units at $14.39, indicating additional insider alignment with the issuer

Negative

  • None.

Insights

TL;DR: Small insider purchase reported; large aggregate stake held indirectly, transaction appears immaterial to overall position.

The Form 4 shows a 3,085-unit purchase at $14.39 executed by BCEM on 08/11/2025. That purchase increases BCEM's direct holdings to 10,085 units and contributes to a reported aggregate beneficial ownership of 74,816,024 units across related entities. Given the magnitude of the aggregated stake, the incremental purchase is minor and unlikely to be material to valuation, and no derivative activity was reported.

TL;DR: Director/Managing Partner structure creates indirect beneficial ownership; filing clarifies relationships and ownership aggregation.

The filing documents that BCE-Mach Aggregator LLC holds 74,805,939 units and BCEM holds 10,085 units, with BCEM indirectly managing the aggregator. William W. McMullen signs as Managing Partner and Authorized Signatory and is identified as a Director and 10% owner. The remarks note the issuer is managed by the General Partner's directors and officers, clarifying governance links between the reporting persons and the issuer.

Insider McMullen William Wallace, BCE-Mach Aggregator LLC, BAYOU CITY ENERGY MANAGEMENT LLC
Role Director, 10% Owner | 10% Owner | 10% Owner
Bought 3,085 shs ($44K)
Type Security Shares Price Value
Purchase Common Units 3,085 $14.39 $44K
Holdings After Transaction: Common Units — 74,816,024 shares (Indirect, See footnote)
Footnotes (1)
  1. These common units were purchased by Bayou City Energy Management LLC ("BCEM"). After the reported transactions, the reported common units are directly held 74,805,939 by BCE-Mach Aggregator LLC ("BCE Aggregator") and 10,085 by 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.
Form 4 Insider Transactions: What Each Field Means →
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*
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)
08/11/2025
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 08/11/2025 P 3,085(1) A $14.39 74,816,024(2) I See footnote(2)
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.
1201 LOUISIANA STREET SUITE 3308
(Street)
HOUSTON TX 77002
(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.
1201 LOUISIANA STREET SUITE 3308
(Street)
HOUSTON TX 77002
(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 Bayou City Energy Management LLC ("BCEM").
2. After the reported transactions, the reported common units are directly held 74,805,939 by BCE-Mach Aggregator LLC ("BCE Aggregator") and 10,085 by 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 08/12/2025
Bayou City Energy Management LLC, By: /s/ William W. McMullen, Name: William W. McMullen, Title: Managing Partner 08/12/2025
William W. McMullen, By: /s/ William W. McMullen 08/12/2025
** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What transaction did the MNR Form 4 report?

The Form 4 reports that BCEM purchased 3,085 common units of Mach Natural Resources LP on 08/11/2025 at a price of $14.39 per unit.

How many MNR units do the reporting persons beneficially own after the transaction?

After the reported transaction the filing shows aggregate beneficial ownership of 74,816,024 common units (74,805,939 held by BCE-Mach Aggregator LLC and 10,085 held by BCEM).

What is William W. McMullen's relationship to MNR?

William W. McMullen is identified as Managing Partner of BCEM, a Director, and a 10% owner and signed the Form 4 on 08/12/2025.

Were any derivative securities reported on this Form 4 for MNR?

No. Table II for derivative securities is blank; the filing reports only a non-derivative purchase of common units.

Which entities hold the reported MNR units?

The filing shows direct holdings by BCE-Mach Aggregator LLC (74,805,939 units) and Bayou City Energy Management LLC (BCEM) (10,085 units); BCE Aggregator is indirectly managed by BCEM.