# EDGAR Filing Document

**Accession Number:** 0001423902
**File Stem:** 0001140361-26-003920
**Filing Date:** 2026-2
**Character Count:** 36015
**Document Hash:** 65d0c0c5620b89f74fa8ea197b452b9b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-26-003920.hdr.sgml**: 20260205

**ACCESSION NUMBER**: 0001140361-26-003920

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260205

**DATE AS OF CHANGE**: 20260205

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Western Midstream Partners, LP
- **CENTRAL INDEX KEY:** 0001423902
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS TRANSMISSION [4922]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 261075656
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-87105
- **FILM NUMBER:** 26604266

**BUSINESS ADDRESS:**
- **STREET 1:** 9950 WOODLOCH FOREST DRIVE, SUITE 2800
- **CITY:** THE WOODLANDS
- **STATE:** TX
- **ZIP:** 77380-7046
- **BUSINESS PHONE:** 346-786-5000

**MAIL ADDRESS:**
- **STREET 1:** 9950 WOODLOCH FOREST DRIVE, SUITE 2800
- **CITY:** THE WOODLANDS
- **STATE:** TX
- **ZIP:** 77380-7046

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Western Gas Equity Partners, LP
- **DATE OF NAME CHANGE:** 20121023

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WGR Holdings LLC
- **DATE OF NAME CHANGE:** 20080115
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** OCCIDENTAL PETROLEUM CORP /DE/
- **CENTRAL INDEX KEY:** 0000797468
- **STANDARD INDUSTRIAL CLASSIFICATION:** CRUDE PETROLEUM & NATURAL GAS [1311]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 954035997
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** 5 GREENWAY PLAZA
- **STREET 2:** SUITE 110
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77046
- **BUSINESS PHONE:** 7132157000

**MAIL ADDRESS:**
- **STREET 1:** 5 GREENWAY PLAZA
- **STREET 2:** SUITE 110
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77046

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 9)**

**Western Midstream Partners, LP**

*(Name of Issuer)*

**Common Units Representing Limited Partner Interests**

*(Title of Class of Securities)*

**958669103**

*(CUSIP Number)*

**Nicole E. Clark**<br>5 Greenway Plaza<br>Suite 110<br>Houston TX 77046<br>(713) 215-7000

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

**02/03/2026**

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

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Occidental Petroleum Corporation** | Name of reporting person<br>**Occidental Petroleum Corporation** | |
| 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>**150374176.00** |
| 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>**150374176.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | |
| 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>**38.3%** | Percent of class represented by amount in Row (11)<br>**38.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Represents (i) 140,912,118 common units representing limited partner interests in the Issuer ("Common Units") held by Western Gas Resources, Inc. ("WGRI"), (ii) 457,849 Common Units held by APC Midstream Holdings, LLC ("AMH") and (iii) 9,004,209 Common Units held by Anadarko USH1 Corporation ("AUSH1"). Occidental Petroleum Corporation ("Occidental") indirectly owns 100% of the issued and outstanding common stock of Anadarko Petroleum Corporation ("Anadarko"), which directly or indirectly owns 100% of the issued and outstanding equity interests of WGRI, AMH and AUSH1. Occidental may, therefore, be deemed to beneficially own the Common Units held by WGRI, AMH and AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**OXY USA Inc.** | Name of reporting person<br>**OXY USA Inc.** | |
| 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>**150374176.00** |
| 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>**150374176.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | |
| 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>**38.3%** | Percent of class represented by amount in Row (11)<br>**38.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Represents (i) 140,912,118 Common Units held by WGRI, (ii) 457,849 Common Units held by AMH and (iii) 9,004,209 Common Units held by AUSH1. OXY Oil Partners, Inc. indirectly owns 100% of the issued and outstanding common stock of Anadarko, which directly or indirectly owns 100% of the issued and outstanding equity interests of WGRI, AMH and AUSH1. Oxy Oil Partners, Inc. may be deemed to beneficially own the Common Units held by WGRI, AMH and AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**OXY Oil Partners, Inc.** | Name of reporting person<br>**OXY Oil Partners, Inc.** | |
| 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>**150374176.00** |
| 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>**150374176.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | |
| 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>**38.3%** | Percent of class represented by amount in Row (11)<br>**38.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Represents (i) 140,912,118 Common Units held by WGRI, (ii) 457,849 Common Units held by AMH and (iii) 9,004,209 Common Units held by AUSH1. OXY Oil Partners, Inc. indirectly owns 100% of the issued and outstanding common stock of Anadarko, which directly or indirectly owns 100% of the issued and outstanding equity interests of WGRI, AMH and AUSH1. Oxy Oil Partners, Inc. may be deemed to beneficially own the Common Units held by WGRI, AMH and AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Baseball Merger Sub 2, Inc.** | Name of reporting person<br>**Baseball Merger Sub 2, Inc.** | |
| 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>**150374176.00** |
| 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>**150374176.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | |
| 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>**38.3%** | Percent of class represented by amount in Row (11)<br>**38.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Represents (i) 140,912,118 Common Units held by WGRI, (ii) 457,849 Common Units held by AMH and (iii) 9,004,209 Common Units held by AUSH1. Baseball Merger Sub 2, Inc. indirectly owns 100% of the issued and outstanding common stock of Anadarko, which directly or indirectly owns 100% of the issued and outstanding equity interests of WGRI, AMH and AUSH1. Baseball Merger Sub 2, Inc. may, therefore, be deemed to beneficially own the Common Units held by WGRI, AMH and AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Anadarko Petroleum Corporation** | Name of reporting person<br>**Anadarko Petroleum Corporation** | |
| 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>**150374176.00** |
| 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>**150374176.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | Aggregate amount beneficially owned by each reporting person<br>**150374176.00** | |
| 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>**38.3%** | Percent of class represented by amount in Row (11)<br>**38.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Represents (i) 140,912,118 Common Units held by WGRI, (ii) 457,849 Common Units held by AMH and (iii) 9,004,209 Common Units held by AUSH1. Anadarko directly or indirectly owns 100% of the issued and outstanding equity interests of WGRI, AMH and AUSH1 and may, therefore, be deemed to beneficially own the Common Units held by WGRI, AMH and AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Western Gas Resources, Inc.** | Name of reporting person<br>**Western Gas Resources, Inc.** | |
| 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>**—** | Citizenship or place of organization<br>**—** | |
| 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>**141369967.00** |
| 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>**141369967.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**141369967.00** | Aggregate amount beneficially owned by each reporting person<br>**141369967.00** | |
| 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>**36.0%** | Percent of class represented by amount in Row (11)<br>**36.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Represents (i) 140,912,118 Common Units held by WGRI and (ii) 457,849 Common Units held by AMH. In addition to its Common Units held of record, WGRI directly owns 100% of the issued and outstanding equity interests of AMH and may, therefore, be deemed to beneficially own the Common Units held by AMH. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**APC Midstream Holdings, LLC** | Name of reporting person<br>**APC Midstream Holdings, 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>**457849.00** |
| 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>**457849.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**457849.00** | Aggregate amount beneficially owned by each reporting person<br>**457849.00** | |
| 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>**0.1%** | Percent of class represented by amount in Row (11)<br>**0.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** Represents 457,849 Common Units held by AMH. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Anadarko Holding Company** | Name of reporting person<br>**Anadarko Holding Company** | |
| 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>**UTAH** | Citizenship or place of organization<br>**UTAH** | |
| 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>**9004209.00** |
| 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>**9004209.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | |
| 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>**2.3%** | Percent of class represented by amount in Row (11)<br>**2.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Represents 9,004,209 Common Units held by AUSH1. Anadarko Holding Company ("AHC") and Kerr-McGee Corporation ("KMG") together own 100% of the common stock of Kerr-McGee Worldwide Corporation ("KMWW"), and Anadarko and KMWW together indirectly own 100% of the common stock of AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Kerr-McGee Corporation** | Name of reporting person<br>**Kerr-McGee Corporation** | |
| 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>**9004209.00** |
| 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>**9004209.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | |
| 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>**2.3%** | Percent of class represented by amount in Row (11)<br>**2.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Represents 9,004,209 Common Units held by AUSH1. AHC and KMG together own 100% of the common stock of KMWW, and Anadarko and KMWW together indirectly own 100% of the common stock of AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Kerr-McGee Worldwide Corporation** | Name of reporting person<br>**Kerr-McGee Worldwide Corporation** | |
| 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>**9004209.00** |
| 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>**9004209.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | |
| 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>**2.3%** | Percent of class represented by amount in Row (11)<br>**2.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** Represents 9,004,209 Common Units held by AUSH1. KMWW and Anadarko together indirectly own 100% of the common stock of AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

| **CUSIP No.** | **958669103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Anadarko USH1 Corporation** | Name of reporting person<br>**Anadarko USH1 Corporation** | |
| 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>**9004209.00** |
| 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>**9004209.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | Aggregate amount beneficially owned by each reporting person<br>**9004209.00** | |
| 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>**2.3%** | Percent of class represented by amount in Row (11)<br>**2.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Represents 9,004,209 Common Units held of record by AUSH1. The calculation is based on a total of 392,688,323 Common Units issued and outstanding as of October 31, 2025 after giving effect to the redemption reported herein.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Units Representing Limited Partner Interests

**(b) Name of Issuer:**
Western Midstream Partners, LP

**(c) Address of Issuer's Principal Executive Offices:**
9950 Woodloch Forest Drive, Suite 2800, The Woodlands, TX, 77380

This Amendment No. 9 amends and supplements the Schedule 13D filed with the Securities and Exchange Commission on August 19, 2019 (the "Original Schedule 13D," and as amended, the "Schedule 13D") relating to the common units representing limited partner interests (the "Common Units") in Western Midstream Partners, LP, a Delaware master limited partnership (the "Issuer") beneficially owned by Occidental Petroleum Corporation ("Occidental"), OXY USA Inc. ("OXY USA"), OXY Oil Partners, Inc. ("OOP"), Baseball Merger Sub 2, Inc. ("BMS"), Anadarko Petroleum Corporation ("Anadarko"), Western Gas Resources, Inc. ("WGRI"), APC Midstream Holdings, LLC ("AMH"), Anadarko Holding Company ("AHC"), Kerr-McGee Corporation ("KMG"), Kerr-McGee Worldwide Corporation ("KWC") and Anadarko USH1 Corporation ("AUSH1" and together with Occidental, OXY USA, OOP, BMS, Anadarko, WGRI, AMH, AHC, KMG and KWC, the "Reporting Persons"). Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Original Schedule 13D and subsequent amendments, as applicable.

The filing of this Amendment No. 9 shall not be construed as an admission that any of the Reporting Persons is for the purposes of Section 13(d) or 13(g) of the Securities Exchange Act of 1934, the beneficial owner of any of the Common Units reported herein. Pursuant to Rule 13d-4, each of the Reporting Persons disclaims all such beneficial ownership in any such Common Units.

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

**(a)**
See the information on the cover pages of this Amendment No. 9 to the Schedule 13D, which is incorporated by reference herein.

**(b)**
See the information on the cover pages of this Amendment No. 9 to the Schedule 13D, which is incorporated by reference herein.

**(c)**
On February 3, 2026, WGRI transferred and surrendered 15,307,402 Common Units to the Issuer in connection with the closing of the transactions contemplated by the previously disclosed Unit Redemption Agreement. Except for the foregoing, none of the Reporting Persons, nor, to the Reporting Persons' knowledge, any of the Listed Persons, has effected any transactions in the Common Units since Amendment No. 8.

### 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:** Occidental Petroleum Corporation

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President, Corporate Secretary and Chief Compliance Officer

**Date:** 02/05/2026

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:** OXY USA Inc.

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** OXY Oil Partners, Inc.

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** Baseball Merger Sub 2, Inc.

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** Anadarko Petroleum Corporation

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** Western Gas Resources, Inc.

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** APC Midstream Holdings, LLC

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** Anadarko Holding Company

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** Kerr-McGee Corporation

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** Kerr-McGee Worldwide Corporation

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026

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:** Anadarko USH1 Corporation

**Signature:** /s/ Nicole E. Clark

**Name/Title:** Nicole E. Clark, Vice President and Secretary

**Date:** 02/05/2026