# EDGAR Filing Document

**Accession Number:** 0001730532
**File Stem:** 0000919574-25-005480
**Filing Date:** 2025-9
**Character Count:** 8259
**Document Hash:** ac624ad78d1b5644d48d2697ccdead75
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000919574-25-005480.hdr.sgml**: 20250902

**ACCESSION NUMBER**: 0000919574-25-005480

**CONFORMED SUBMISSION TYPE**: N-PX

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250630

**FILED AS OF DATE**: 20250902

**EFFECTIVENESS DATE**: 20250902

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Mountaineer Partners Management, LLC
- **CENTRAL INDEX KEY:** 0001730532

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

**FILING VALUES:**
- **FORM TYPE:** N-PX
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 028-19269
- **FILM NUMBER:** 251284663

**BUSINESS ADDRESS:**
- **STREET 1:** 950 3RD AVENUE
- **STREET 2:** 28TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** 646-459-7060

**MAIL ADDRESS:**
- **STREET 1:** 950 3RD AVENUE
- **STREET 2:** 28TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022

## FORM N-PX
### ANNUAL REPORT OF PROXY VOTING RECORD

## N-PX: Filer Information

**Filer CIK:** 0001730532

**Date of Report:** 06/30/2025

**Are you a Registered Management Investment Company or an Institutional Manager?:** Institutional Manager

**Is this a LIVE or TEST Filing?:** LIVE

**Is this an electronic copy of an official filing submitted in paper format?:** [ ]

### Submission Contact Information
_Not provided in this filing._

### Notification Information
**Notify via Filing Website only?:** [ ]

## N-PX: Cover Page

**Name of reporting person:** Mountaineer Partners Management, LLC

**Address:** 950 3RD AVENUE, NEW YORK, NY 10022

**Telephone number:** 646-459-7061

**Name of agent for service:** —

**Agent Address:** —, —, — —

**Reporting Period:** Report for the year ended 06/30/2025

**SEC File Number:** 028-19269

**CRD Number (if any):** —

**Other SEC File Number (if any):** —

**LEI (if any):** —

**Report Type (check only one):**

Institutional Manager.

- [x] Institutional Manager Voting Report

- [ ] Institutional Manager Notice Report

- [ ] Institutional Manager Combination Report

Registered Management Investment Company.

- [ ] Fund Voting Report

- [ ] Fund Notice Report

**Do you wish to provide explanatory information pursuant to Special Instruction B.4?:**

- [x] No

- [ ] Yes

**Additional information:** —

## N-PX: Summary - Included Managers

**Number of Included Institutional Managers:** 0

**Included Institutional Managers:** —

## FORM N-PX PROXY VOTING RECORD

| NAME OF ISSUER                  | CUSIP     | MEETING DATE   | VOTE DESCRIPTION                                                                                                                                                                                       | VOTE CATEGORY                |   SHARES VOTED |   SHARES ON LOAN | HOW VOTED   |   SHARES VOTED FOR OR AGAINST MANAGEMENT | FOR OR AGAINST MANAGEMENT   | OTHER INFO   |
|:---|:---|:---|:---|:---|---:|---:|:---|---:|:---|:---|
| Alcoa Corporation               | 013872106 | 05/08/2025     | Approval, on an advisory basis, of the Company's 2024 named executive officer compensation                                                                                                             | SECTION 14A SAY-ON-PAY VOTES |         210751 |                0 | abstain     |                                   210751 | NONE                        |  |
| Ardagh Metal Packaging S.A.     |  | 05/27/2025     | Approve the aggregate amount of the directors' remuneration for the year ending December 31, 2025.                                                                                                     | SECTION 14A SAY-ON-PAY VOTES |         816220 |                0 | abstain     |                                   816220 | NONE                        |  |
| ATI Inc.                        | 01741R102 | 05/16/2025     | Advisory vote to approve the compensation of our named executive officers.                                                                                                                             | SECTION 14A SAY-ON-PAY VOTES |         145140 |              328 | abstain     |                                   145140 | NONE                        |  |
| Builders Firstsource, Inc.      | 12008R107 | 05/27/2025     | An advisory vote on the compensation of the named executive officers.                                                                                                                                  | SECTION 14A SAY-ON-PAY VOTES |          47248 |                0 | abstain     |                                    47248 | NONE                        |  |
| Century Aluminum Company        | 156431108 | 06/15/2025     | Proposal to approve, on an advisory basis, the compensation of the named executive officers.                                                                                                           | SECTION 14A SAY-ON-PAY VOTES |         579832 |            10271 | abstain     |                                   579832 | NONE                        |  |
| Entegris, Inc.                  | 29362U104 | 04/23/2025     | Approval, by non-binding vote, of the compensation paid to Entegris, Inc.'s named executive officers (advisory vote).                                                                                  | SECTION 14A SAY-ON-PAY VOTES |          78724 |              748 | abstain     |                                    78724 | NONE                        |  |
| Everus Construction Group, Inc. | 300426103 | 05/20/2025     | Advisory Vote to Approve the Frequency of Future Advisory Votes to Approve the Compensation Paid to the Company's Named Executive Officers.                                                            | SECTION 14A SAY-ON-PAY VOTES |         178327 |                0 | abstain     |                                   178327 | NONE                        |  |
| Everus Construction Group, Inc. | 300426103 | 05/20/2025     | Advisory Vote to Approve the Compensation Paid to the Company's Named Executive Officers.                                                                                                              | SECTION 14A SAY-ON-PAY VOTES |         178327 |                0 | abstain     |                                   178327 | NONE                        |  |
| Freeport-McMoRan Inc.           | 35671D857 | 06/10/2025     | Approval, on an advisory basis, of the compensation of our named executive officers.                                                                                                                   | SECTION 14A SAY-ON-PAY VOTES |         205826 |                0 | abstain     |                                   205826 | NONE                        |  |
| Hudbay Minerals Inc.            | 443628102 | 05/14/2025     | On an advisory basis, and not to diminish the role and responsibilities of Hudbay's Board of Directors, you accept the approach to executive compensation in our 2025 management information circular. | SECTION 14A SAY-ON-PAY VOTES |         928580 |                0 | abstain     |                                   928580 | NONE                        |  |
| Vishay Intertechnology, Inc.    | 928298108 | 05/20/2025     | The advisory approval of the compensation of the Company's Named Executive Officers.                                                                                                                   | SECTION 14A SAY-ON-PAY VOTES |         542713 |             8320 | abstain     |                                   542713 | NONE                        |  |
| Vishay Intertechnology, Inc.    | 928298108 | 05/20/2025     | Frequency of advisory vote on the compensation of the Company's Named Executive Officers.                                                                                                              | SECTION 14A SAY-ON-PAY VOTES |         542713 |             8320 | abstain     |                                   542713 | NONE                        |  |

## N-PX: Signature Block

**Reporting Person:** Mountaineer Partners Management, LLC

**By (Signature):** Mark Lee

**By (Printed Signature):** Mark Lee

**By (Title):** Managing Member

**Date:** 09/02/2025