William W. McMullen - 19 Mar 2026 Form 4 Insider Report for MACH NATURAL RESOURCES LP (MNR)

Reporting relationship: Director, Other*, 10%+ Owner
Issuer ticker: MNR
Reported as of: 19 Mar 2026
Net transaction value: +$128,800
SEC form: 4
Accepted by SEC: 23 Mar 2026, 16:05:11 UTC
Prior SEC filing: 10 Dec 2025
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 23 Mar 2026.

Key facts

This page summarizes William W. McMullen's Form 4 filing for MACH NATURAL RESOURCES LP (MNR).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 23 Mar 2026, 16:05.

Change

Previous filing in this sequence was filed on 10 Dec 2025.
Current net transaction value: +$128,800.

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 (3)

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: 23 Mar 2026

CIK 0001997530

BCE-Mach Aggregator LLC

Relationship: 10%+ Owner
Address: C/O BAYOU CITY ENERGY, L.P., 2229 SAN FELIPE STREET, SUITE 1075, HOUSTON
Signature: BCE-Mach Aggregator LLC, By: /s/ William W. McMullen, Name: William W. McMullen, Title: Authorized Signatory
Signature date: 23 Mar 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: 23 Mar 2026

Reported non-derivative transactions

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

MNR transaction

Common Units

Purchase

Transaction value: $49,980
Shares: +3,570
Change %: +0%
Price: $14.00
Shares after: 74,854,202
Date: 19 Mar 2026
Ownership: See footnote
Footnotes: F1, F2, F4

MNR transaction

Common Units

Purchase

Transaction value: $35,000
Shares: +2,500
Change %: +0%
Price: $14.00
Shares after: 74,856,702
Date: 20 Mar 2026
Ownership: See footnote
Footnotes: F1, F4

MNR transaction

Common Units

Purchase

Transaction value: $43,820
Shares: +3,215
Change %: +0%
Price: $13.63
Shares after: 74,859,917
Date: 23 Mar 2026
Ownership: See footnote
Footnotes: F1, F3, F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

These common units were purchased by Bayou City Energy Management LLC ("BCEM").

Footnote F2

The price reported in Column 4 is a weighted average price. These common units were purchased by BCEM in multiple transactions at prices ranging from $13.99 to $14.00, 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 (the "SEC"), 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.

Footnote F3

The price reported in Column 4 is a weighted average price. These common units were purchased by BCEM in multiple transactions at prices ranging from $13.535 to $13.65, 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 (the "SEC"), 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.

Footnote F4

After the reported transactions, the reported common units are directly held 74,835,939 by BCE Mach Aggregator LLC ("BCE Aggregator") and 23,978 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.

SEC 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.