# EDGAR Filing Document

**Accession Number:** 0002023210
**File Stem:** 0001193125-26-000936
**Filing Date:** 2026-1
**Character Count:** 8591
**Document Hash:** 0473fad58d9cfe4d526c9f52e93c2353
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-000936.hdr.sgml**: 20260102

**ACCESSION NUMBER**: 0001193125-26-000936

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250815

**FILED AS OF DATE**: 20260102

**DATE AS OF CHANGE**: 20260102

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Lee Seunghoon
- **CENTRAL INDEX KEY:** 0002023210

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34791
- **FILM NUMBER:** 26502543

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** C/O MAGNACHIP SEMICONDUCTOR, LTD.
- **STREET 2:** 108, YEOUI-DAERO, YEONGDEUNGPO-GU
- **CITY:** SEOUL
- **PROVINCE COUNTRY:** M5
- **ZIP:** 07335
**ISSUER**: 

**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

**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

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Lee Seunghoon<br><sub>(Last) (First) (Middle)</sub><br>C/O MAGNACHIP SEMICONDUCTOR, LTD.,<br>108, YEOUI-DAERO, YEONGDEUNGPO-GU<br><sub>(Street)</sub><br>SEOUL, M5 07335<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-08-15 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_See Remarks_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>MAGNACHIP SEMICONDUCTOR Corp [ MX ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-08-15 |  | A |  | 30750 | A | $0 | 136953 | D |  |
| Common Stock | 2025-12-31 |  | A |  | 7000<sup>(1)</sup> | A | $2.55 | 143953 | D |  |
| Common Stock | 2025-12-31 |  | F |  | 3333<sup>(2)</sup> | D | $2.55 | 140620 | D |  |
| Common Stock | 2025-12-31 |  | F |  | 2778<sup>(3)</sup> | D | $2.55 | 137842 | D |  |
| Common Stock | 2025-12-31 |  | F |  | 4761<sup>(4)</sup> | D | $2.55 | 133081 | D |  |
| Common Stock | 2025-12-31 |  | F |  | 4880<sup>(5)</sup> | D | $2.55 | 128201 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Performance-Based Restricted Stock Units | <sup>(6)</sup> | 2025-08-15 |  | A |  | 15375 |  | <sup>(7)</sup> | 2028-01-31 | Common Stock | 15375 | $0.00 | 15375 | D |  |

---

### Footnotes:

(1) This transaction reflects shares of common stock issued in connection with the vesting of financial performance-based restricted stock units granted on June 1, 2024.

(2) This transaction represents the withholding by the Issuer of 3,333 shares of common stock to satisfy tax withholding obligations incurred by the Reporting Person upon the vesting of 7,000 shares of common stock originally awarded to the Reporting Person on June 1, 2024.

(3) This transaction represents the withholding by the Issuer of 2,778 shares of common stock to satisfy tax withholding obligations incurred by the Reporting Person upon the vesting of 5,834 shares of common stock originally awarded to the Reporting Person on March 23, 2023.

(4) This transaction represents the withholding by the Issuer of 4,761 shares of common stock to satisfy tax withholding obligations incurred by the Reporting Person upon the vesting of 10,000 shares of common stock originally awarded to the Reporting Person on June 1, 2024.

(5) This transaction represents the withholding by the Issuer of 4,880 shares of common stock to satisfy tax withholding obligations incurred by the Reporting Person upon the vesting of 10,250  shares of common stock originally awarded to the Reporting Person on August 15, 2025.

(6) Each Performance-Based Restricted Stock Units ("PRSUs") represents a contingent right to receive one share of Issuer's common stock.

(7) Reflects a number of shares of Issuer common stock that the Reporting Person would receive upon vesting and settlement of the PRSUs at the target level of performance, provided that the actual number of PRSUs that would become eligible to vest range from 0% to 100% of the target number of PRSUs based on actual achievement. The PRSUs vest upon Issuer's common stock achieving a specified price per share.

**Remarks:**
Chief of Manufacturing

**Signature:** /s/ Shin Young Park  
**Date:** 2026-01-02

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**