# EDGAR Filing Document

**Accession Number:** 0001980088
**File Stem:** 0001213900-25-055243
**Filing Date:** 2025-6
**Character Count:** 17135
**Document Hash:** 8a37ed74fe599cab508d9a1c85606de7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-25-055243.hdr.sgml**: 20250617

**ACCESSION NUMBER**: 0001213900-25-055243

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250617

**DATE AS OF CHANGE**: 20250617

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MACH NATURAL RESOURCES LP
- **CENTRAL INDEX KEY:** 0001980088
- **STANDARD INDUSTRIAL CLASSIFICATION:** CRUDE PETROLEUM & NATURAL GAS [1311]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-94205
- **FILM NUMBER:** 251054142

**BUSINESS ADDRESS:**
- **STREET 1:** 14201 WIRELESS WAY, SUITE 300
- **CITY:** OKLAHOMA CITY
- **STATE:** OK
- **ZIP:** 73134
- **BUSINESS PHONE:** (405) 252-8100

**MAIL ADDRESS:**
- **STREET 1:** 14201 WIRELESS WAY, SUITE 300
- **CITY:** OKLAHOMA CITY
- **STATE:** OK
- **ZIP:** 73134
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BCE-Mach Aggregator LLC
- **CENTRAL INDEX KEY:** 0001997530

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D

**BUSINESS ADDRESS:**
- **STREET 1:** 14201 WIRELESS WAY, SUITE 300
- **CITY:** OKLAHOMA CITY
- **STATE:** OK
- **ZIP:** 73134
- **BUSINESS PHONE:** 405-252-8100

**MAIL ADDRESS:**
- **STREET 1:** 14201 WIRELESS WAY, SUITE 300
- **CITY:** OKLAHOMA CITY
- **STATE:** OK
- **ZIP:** 73134

## Ex-1

**Exhibit 1**

**JOINT FILING AGREEMENT**

This will confirm the agreement by and among the undersigned that the Schedule 13D filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the Common Units representing limited partner interests of Mach Natural Resources LP (this "Agreement"), is being filed, and all amendments thereto will be filed, by BCE-Mach Aggregator LLC as designated filer on behalf of each of the persons and entities named below that is named as a reporting person in such filing in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Dated: June 17, 2025

---

| | |
|:---|:---|
| **BCE-MACH AGGREGATOR LLC** | **BCE-MACH AGGREGATOR LLC** |
| /s/ William W. McMullen | /s/ William W. McMullen |
| Name: | William W. McMullen |
| Title: | Authorized Signatory |
| **BAYOU CITY ENERGY MANAGEMENT LLC** | **BAYOU CITY ENERGY MANAGEMENT LLC** |
| /s/ William W. McMullen | /s/ William W. McMullen |
| Name: | William W. McMullen |
| Title: | Managing Partner |
| /s/ William W. McMullen | /s/ William W. McMullen |
| Name: | William W. McMullen |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**Mach Natural Resources LP**

*(Name of Issuer)*

**Common units representing limited partner interests**

*(Title of Class of Securities)*

**55445L100**

*(CUSIP Number)*

**William Wallace McMullen**<br>1201 Louisiana Street, Suite 3308<br>Houston TX 77002<br>713-400-8200

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**06/10/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **55445L100** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**BCE-Mach Aggregator LLC** | Name of reporting person<br>**BCE-Mach Aggregator LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**74805939.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**74805939.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**74805939.00** | Aggregate amount beneficially owned by each reporting person<br>**74805939.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**63.2%** | Percent of class represented by amount in Row (11)<br>**63.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** Based on 118,336,367 common units representing limited partner interests ("Common Units") outstanding as of May 2, 2025, as reported by Mach Natural Resources LP (the "Issuer") on its Form 10-Q filed with the U.S. Securities and Exchange Commission (the "Commission") on May 8, 2025.

| **CUSIP No.** | **55445L100** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Bayou City Energy Management LLC** | Name of reporting person<br>**Bayou City Energy Management LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**74812939.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**74812939.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**74812939.00** | Aggregate amount beneficially owned by each reporting person<br>**74812939.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**63.2%** | Percent of class represented by amount in Row (11)<br>**63.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** Based on 118,336,367 common units representing limited partner interests ("Common Units") outstanding as of May 2, 2025, as reported by Mach Natural Resources LP (the "Issuer") on its Form 10-Q filed with the U.S. Securities and Exchange Commission (the "Commission") on May 8, 2025.

| **CUSIP No.** | **55445L100** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**William Wallace McMullen** | Name of reporting person<br>**William Wallace McMullen** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**74812939.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**74812939.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**74812939.00** | Aggregate amount beneficially owned by each reporting person<br>**74812939.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**63.2%** | Percent of class represented by amount in Row (11)<br>**63.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Based on 118,336,367 common units representing limited partner interests ("Common Units") outstanding as of May 2, 2025, as reported by Mach Natural Resources LP (the "Issuer") on its Form 10-Q filed with the U.S. Securities and Exchange Commission (the "Commission") on May 8, 2025.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common units representing limited partner interests

**(b) Name of Issuer:**
Mach Natural Resources LP

**(c) Address of Issuer's Principal Executive Offices:**
14201 Wireless Way, Suite 300, Oklahoma City, OK, 73134

**Item 4. Purpose of Transaction**

Prior to the closing of the Issuer's initial public offering (the "IPO"), the Reporting Persons acquired 68,226,633 Common Units in exchange for equity securities of the predecessor of the Issuer. In connection with the IPO, the following agreements were entered into governing certain rights of the Reporting Persons:

(i) the Amended and Restated Agreement of Limited Partnership of Mach Natural Resources LP, which among other things, provided the Reporting Persons (i) customary registration rights and (ii) through its controlling interest in the Issuer's general partner, certain governance rights; and
(ii) the Amended and Restated Limited Liability Company Agreement of Mach Natural Resources GP, LLC (the "GP LLCA"), which governs the board of directors (the "Board") that controls the Issuer. The Reporting Persons have the right to appoint a majority of the Board.

The foregoing descriptions of the Partnership Agreement and GP LLCA do not purport to be complete and are qualified in their entirety by the full text thereof, copies of which are attached as Exhibit 2 and Exhibit 3 hereto, respectively, and incorporated herein by reference.

In December 2024, the Reporting Persons purchased an additional 899,487 Common Units in open market transactions, at prices ranging from $14.61 to $15.75 per Common Unit. On February 7, 2025, the Reporting Persons purchased an additional 5,161,290 Common Units in an underwritten offering at a price of $15.50 per Common Unit. All such Common Units were previously reported on a Schedule 13G filed by the Reporting Persons on November 2, 2023, and as subsequently amended on May 13, 2025. The information set forth or incorporated by reference in Item 5(c) of this Schedule 13D is incorporated by reference into this Item 4.

The Reporting Persons or their affiliates intend to review their investment in the Issuer on an ongoing basis and may seek to increase or decrease their position in the issuer including purchasing additional Common Units and/or other equity, debt, notes or other financial instruments related to the Issuer. In addition, the Reporting Persons or their affiliates may seek to sell or otherwise dispose of some or all securities of the Issuer, including the reported Common Units and/or other equity, debt, notes or other financial instruments related to the Issuer or Common Units (which may include rights or securities exercisable or convertible into securities of the Issuer), and/or acquire some or all of such Issuer securities or financial instruments (which may include distributing some or all of such securities to such Reporting Person's respective members, stockholders, partners or beneficiaries, as applicable, transferring shares of common stock to affiliated transferees, or the entry into a total return swap, asset swap or repurchase transaction) from time to time, in each case, in open market or private transactions, block sales or otherwise. The Reporting Persons or their affiliates may engage from time to time in ordinary course transactions with financial institutions with respect to the securities described herein.

Any transaction that any of the Reporting Persons or their affiliates may pursue may be made at any time and from time to time without prior notice and will depend on a variety of factors, including, without limitation, the price and availability of the Issuer's securities or other financial instruments; an ongoing evaluation of the Issuer's business, financial condition, operations and prospects; general industry and economic conditions; the securities markets in general; tax considerations; the Reporting Persons' or such affiliates' trading and investment strategies, other investment and business opportunities, applicable legal and/or contractual restrictions and liquidity requirements; and other factors deemed relevant by such Reporting Persons and such affiliates.

**Item 5. Interest in Securities of the Issuer**

**(a)**
The information set forth in lines 11 and 13 of each of the cover pages hereto is incorporated by reference into this Item 5.

**(b)**
The information set forth on lines 7 through 10 of each of the cover pages hereto is incorporated by reference into this Item 5.

74,805,939 of the reported securities are directly held by BCE Aggregator, which is indirectly managed by BCEM.  Mr. McMullen is the managing partner of BCEM.  Accordingly, each of the Reporting Persons may be deemed to share voting and investment control, and therefore beneficial ownership, of the reported securities.

**(c)**
During the prior 60 days, the Reporting Persons have effected the following transactions related to the Common Units:

June 10, 2025: purchased 79,218 Common Units at a weighted average price per unit of $13.58.
June 11, 2025: purchased 72,411 Common Units at a weighted average price per unit of $14.01.
June 12, 2025: purchased 93,500 Common Units at a weighted average price per unit of $14.29.
June 13, 2025: purchased 135,500 Common Units at a weighted average price per unit of $14.72.
June 16, 2025: purchased 144,900 Common Units at a weighted average price per unit of $14.96.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

The information set forth or incorporated by reference in Item 4 of this Schedule 13D is incorporated by reference into this Item 6.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** BCE-Mach Aggregator LLC

**Signature:** /s/ William W. McMullen

**Name/Title:** William W. McMullen, Authorized Signatory

**Date:** 06/17/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Bayou City Energy Management LLC

**Signature:** /s/ William W. McMullen

**Name/Title:** William W. McMullen, Authorized Signatory

**Date:** 06/17/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** William Wallace McMullen

**Signature:** /s/ William W. McMullen

**Name/Title:** William W. McMullen

**Date:** 06/17/2025