William W. McMullen - 15 Sep 2026 Form 4 Insider Report for MACH NATURAL RESOURCES LP (MNR)

Reporting relationship: Director, Other*, 10%+ Owner
Issuer ticker: MNR
Reported as of: 15 Sep 2026
Net transaction value: +$388,902
SEC form: 4
Accepted by SEC: 17 Sep 2026, 17:11:13 UTC
Prior SEC filing: 23 Mar 2026
Source filing: View source filing
Reporting owner signature: William W. McMullen, By: /s/ William W. McMullen

Key filing fact

William W. McMullen filed Form 4 for MACH NATURAL RESOURCES LP (MNR) on 17 Sep 2026.

Key facts

This page summarizes William W. McMullen's Form 4 filing for MACH NATURAL RESOURCES LP (MNR).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 17 Sep 2026, 17:11.

Change

Previous filing in this sequence was filed on 23 Mar 2026.
Current net transaction value: +$388,902.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (2)

CIK 0001730172 Primary reporting owner

McMullen William Wallace

Relationship: Director, Other*, 10%+ Owner
Address: 14201 WIRELESS WAY, SUITE 300, OKLAHOMA CITY
Signature: William W. McMullen, By: /s/ William W. McMullen
Signature date: 17 Sep 2026

CIK 0001742941

BAYOU CITY ENERGY MANAGEMENT LLC

Relationship: 10%+ Owner
Address: C/O BAYOU CITY ENERGY, L.P., 2229 SAN FELIPE STREET, SUITE 1075, HOUSTON
Signature: Bayou City Energy Management LLC, By: /s/ William W. McMullen, Name: William W. McMullen, Title: Managing Partner
Signature date: 17 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MNR transaction

Common Units

Purchase

Transaction value: $248,895
Shares: +22,124
Change %
Price: $11.25
Shares after: 22,124
Date: 15 Sep 2026
Ownership: Direct

MNR transaction

Common Units

Purchase

Transaction value: $248,895
Shares: +22,124
Change %
Price: $11.25
Shares after: 22,124
Date: 15 Sep 2026
Ownership: Direct

MNR transaction

Common Units

Purchase

Transaction value: $140,007
Shares: +12,390
Change %: +0.02%
Price: $11.30
Shares after: 74,872,307
Date: 15 Sep 2026
Ownership: See footnote
Footnotes: F1, F2

MNR transaction

Common Units

Purchase

Transaction value: $140,007
Shares: +12,390
Change %: +0.02%
Price: $11.30
Shares after: 74,872,307
Date: 15 Sep 2026
Ownership: See footnote
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

The price reported in Column 4 is a weighted average price. These common units were purchased by Bayou City Energy Management LLC ("BCEM") in multiple transactions at prices ranging from $11.28 to $11.30, inclusive. The Reporting Persons undertake 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 (1) to this Form 4.

Footnote F2

The reported common units are directly held 74,835,939 by BCE Mach Aggregator LLC ("BCE Aggregator") and 36,368 by BCEM. BCE Aggregator is indirectly managed by BCEM. William W. McMullen is the Managing Partner of BCEM. Accordingly, William W. McMullen may be deemed to beneficially own the securities directly held by BCE Aggregator and BCEM, as applicable, but disclaims beneficial ownership of such common units except to the extent of his pecuniary interest therein.

SEC remarks

William W. McMullen 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.