# EDGAR Filing Document

**Accession Number:** 0001325702
**File Stem:** 0000921895-25-003167
**Filing Date:** 2025-11
**Character Count:** 15677
**Document Hash:** 843136e177d2e99df4f1d112d1f6ca06
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000921895-25-003167.hdr.sgml**: 20251120

**ACCESSION NUMBER**: 0000921895-25-003167

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20251120

**DATE AS OF CHANGE**: 20251120

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MAGNACHIP SEMICONDUCTOR Corp
- **CENTRAL INDEX KEY:** 0001325702
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 830406195
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-86576
- **FILM NUMBER:** 251503431

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** C/O MAGNACHIP SEMICONDUCTOR, LTD.
- **STREET 2:** 15F, 76 JIKJI-DAERO, 436BEON-GIL
- **CITY:** CHEONGJU-SI
- **PROVINCE COUNTRY:** M5
- **BUSINESS PHONE:** 82-2-6903-3000

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** C/O MAGNACHIP SEMICONDUCTOR, LTD.
- **STREET 2:** 15F, 76 JIKJI-DAERO, 436BEON-GIL
- **CITY:** CHEONGJU-SI
- **PROVINCE COUNTRY:** M5

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MAGNACHIP SEMICONDUCTOR LLC
- **DATE OF NAME CHANGE:** 20110304

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MAGNACHIP SEMICONDUCTOR Corp
- **DATE OF NAME CHANGE:** 20110303

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MAGNACHIP SEMICONDUCTOR LLC
- **DATE OF NAME CHANGE:** 20100701
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Byreforge LLC
- **CENTRAL INDEX KEY:** 0002096092

**ORGANIZATION NAME:**
- **EIN:** 392942547
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** 850 NEW BURTON ROAD
- **STREET 2:** SUITE 201
- **CITY:** DOVER
- **STATE:** DE
- **ZIP:** 19904
- **BUSINESS PHONE:** 800-483-1140

**MAIL ADDRESS:**
- **STREET 1:** C/O OLSHAN FROME WOLOSKY LLP
- **STREET 2:** 1325 AVENUE OF THE AMERICAS
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019

## Ex-1

Exhibit 1

**<u>Transactions in the Shares During the Past 60 Days</u>**

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;<u>Class of Security</u> | &nbsp;&nbsp; Securities<br> <u>Purchased</u>  | &nbsp;&nbsp; <br> <u>Price ($)</u> | &nbsp;&nbsp; Date of<br> <u>Purchase</u> |

---

**<u>Byreforge LLC</u>**

---

| | | | |
|:---|:---|:---|:---|
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;43651 | &nbsp;&nbsp;3.1152 | &nbsp;&nbsp;09/15/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;50000 | &nbsp;&nbsp;3.1688 | &nbsp;&nbsp;09/16/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;63682 | &nbsp;&nbsp;3.2034 | &nbsp;&nbsp;09/17/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;30000 | &nbsp;&nbsp;3.2885 | &nbsp;&nbsp;09/18/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;10848 | &nbsp;&nbsp;3.2500 | &nbsp;&nbsp;09/22/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;50000 | &nbsp;&nbsp;3.2459 | &nbsp;&nbsp;09/23/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;25700 | &nbsp;&nbsp;3.2500 | &nbsp;&nbsp;09/24/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;272322 | &nbsp;&nbsp;2.7569 | &nbsp;&nbsp;11/04/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;23252 | &nbsp;&nbsp;2.8500 | &nbsp;&nbsp;11/04/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;29133 | &nbsp;&nbsp;2.7400 | &nbsp;&nbsp;11/04/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;20867 | &nbsp;&nbsp;2.7200 | &nbsp;&nbsp;11/04/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;100000 | &nbsp;&nbsp;2.7700 | &nbsp;&nbsp;11/04/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;20000 | &nbsp;&nbsp;2.8000 | &nbsp;&nbsp;11/04/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;177678 | &nbsp;&nbsp;2.6985 | &nbsp;&nbsp;11/05/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;21545 | &nbsp;&nbsp;2.3940 | &nbsp;&nbsp;11/06/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;7450 | &nbsp;&nbsp;2.3900 | &nbsp;&nbsp;11/06/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;12550 | &nbsp;&nbsp;2.3700 | &nbsp;&nbsp;11/06/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;90000 | &nbsp;&nbsp;2.4123 | &nbsp;&nbsp;11/12/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;152770 | &nbsp;&nbsp;2.3128 | &nbsp;&nbsp;11/13/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;12386 | &nbsp;&nbsp;2.3400 | &nbsp;&nbsp;11/13/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;7614 | &nbsp;&nbsp;2.3200 | &nbsp;&nbsp;11/13/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;250000 | &nbsp;&nbsp;2.3218 | &nbsp;&nbsp;11/14/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;197078 | &nbsp;&nbsp;2.3435 | &nbsp;&nbsp;11/17/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;156041 | &nbsp;&nbsp;2.3280 | &nbsp;&nbsp;11/18/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;200000 | &nbsp;&nbsp;2.3210 | &nbsp;&nbsp;11/19/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;40000 | &nbsp;&nbsp;2.3200 | &nbsp;&nbsp;11/19/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;150000 | &nbsp;&nbsp;2.3583 | &nbsp;&nbsp;11/20/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;25000 | &nbsp;&nbsp;2.3700 | &nbsp;&nbsp;11/20/2025 |
| &nbsp;&nbsp;Common Stock | &nbsp;&nbsp;80000 | &nbsp;&nbsp;2.2800 | &nbsp;&nbsp;11/20/2025 |

---

## Exhibit 99.1

Exhibit 99.1

<u>JOINT FILING AGREEMENT</u>

In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including amendments thereto) with respect to the Common Stock, $0.01 par value, of Magnachip Semiconductor Corporation. This Joint Filing Agreement shall be filed as an Exhibit to such Statement.

---

| | |
|:---|:---|
| Byreforge LLC | Byreforge LLC |
| By: | /s/ Cristiano Amoruso |
|  | Cristiano Amoruso, Managing Partner |
| Date: | 11/20/2025 |

---

---

| | |
|:---|:---|
| Amoruso Cristiano | Amoruso Cristiano |
| By: | /s/ Cristiano Amoruso |
|  | Cristiano Amoruso |
| Date: | 11/20/2025 |

---

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**MAGNACHIP SEMICONDUCTOR Corp**

*(Name of Issuer)*

**Common Stock, par value $0.01 per share**

*(Title of Class of Securities)*

**55933J203**

*(CUSIP Number)*

**Cristiano Amoruso**<br>Byreforge LLC<br>853 Broadway<br>New York NY 10003<br>212-451-2300

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

**11/13/2025**

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

| **CUSIP No.** | **55933J203** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Byreforge LLC** | Name of reporting person<br>**Byreforge 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>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 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>**3072779.00** |
| 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>**3072779.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3072779.00** | Aggregate amount beneficially owned by each reporting person<br>**3072779.00** | |
| 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>**8.5%** | Percent of class represented by amount in Row (11)<br>**8.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **55933J203** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Amoruso Cristiano** | Name of reporting person<br>**Amoruso Cristiano** | |
| 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>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 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>**L6** | Citizenship or place of organization<br>**L6** | |
| 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>**3072779.00** |
| 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>**3072779.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3072779.00** | Aggregate amount beneficially owned by each reporting person<br>**3072779.00** | |
| 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>**8.5%** | Percent of class represented by amount in Row (11)<br>**8.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.01 per share

**(b) Name of Issuer:**
MAGNACHIP SEMICONDUCTOR Corp

**(c) Address of Issuer's Principal Executive Offices:**
C/O MAGNACHIP SEMICONDUCTOR, LTD., 15F, 76 JIKJI-DAERO, 436BEON-GIL, CHEONGJU-SI, M5, 28581

**Item 4. Purpose of Transaction**

The Reporting Persons purchased the Shares based on the Reporting Persons' belief that the Shares, when purchased, were undervalued and represented an attractive investment opportunity. Depending upon overall market conditions, other investment opportunities available to the Reporting Persons, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Persons may endeavor to increase or decrease their position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Persons may deem advisable.

The Reporting Persons have engaged, and expect to continue to engage in, discussions with management and Issuer's Board of Directors (the "Board") regarding opportunities for value creation, Board representation and the composition of the Board, generally.

No Reporting Person has any present plan or proposal which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein or such as would occur upon or in connection with completion of, or following, any of the actions discussed herein. The Reporting Persons intend to review their investment in the Issuer on a continuing basis. Depending on various factors including, without limitation, the Issuer's financial position and investment strategy, the price levels of the Shares, conditions in the securities markets and general economic and industry conditions, the Reporting Persons may in the future take such actions with respect to their investment in the Issuer as they deem appropriate including, without limitation, engaging in communications with management and the Issuer's Board of Directors, engaging in discussions with stockholders of the Issuer or other third parties about the Issuer and the Reporting Persons' investment, including potential business combinations or dispositions involving the Issuer or certain of its businesses, making recommendations or proposals to the Issuer concerning changes to the capitalization, ownership structure, board structure (including board composition), potential business combinations or dispositions involving the Issuer or certain of its businesses, or suggestions for improving the Issuer's financial and/or operational performance, purchasing additional Shares, selling some or all of their Shares, engaging in short selling of or any hedging or similar transaction with respect to the Shares, including swaps and other derivative instruments, or changing their intention with respect to any and all matters referred to in Item 4.

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

**(a)**
The aggregate percentage of Shares reported owned by each person named herein is based upon 35,981,823 Shares outstanding, which is the total number of Shares outstanding as of October 31, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 10, 2025.

As of the close of business on the date hereof, Byreforge owned directly 3,072,779 Shares, constituting approximately 8.5% of the Shares outstanding. By virtue of his relationship with Byreforge, Mr. Amoruso may be deemed to beneficially own the Shares owned directly by Byreforge.

**(b)**
Byreforge and Mr. Amoruso may be deemed to have shared power to vote and dispose of the Shares reported in this statement owned directly by Byreforge.

**(c)**
The transactions in the Shares by Byreforge during the past sixty days are set forth in Exhibit 1 and are incorporated herein by reference. All of such transactions were effected in the open market.

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

On the date hereof, the Reporting Persons entered into a Joint Filing Agreement in which the Reporting Persons agreed to the joint filing on behalf of each of them of statements on Schedule 13D with respect to securities of the Issuer. A copy of this agreement is attached as Exhibit 99.1 hereto and is incorporated herein by reference.

### 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:** Byreforge LLC

**Signature:** /s/ Cristiano Amoruso

**Name/Title:** Cristiano Amoruso, Managing Partner

**Date:** 11/20/2025

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:** Amoruso Cristiano

**Signature:** /s/ Cristiano Amoruso

**Name/Title:** Cristiano Amoruso

**Date:** 11/20/2025