[Form 4] MAGNACHIP SEMICONDUCTOR Corp Insider Trading Activity

Rhea-AI Filing Summary

MAGNACHIP SEMICONDUCTOR Corp insider Shin Young Park, Chief of Manufacturing, reported multiple equity transactions in company common stock. On 08/15/2025, Park acquired 30,750 shares at a stated price of $0, and on 12/31/2025, an additional 7,000 shares vested at $2.55 per share. Several transactions coded “F” on the same date reflect the issuer withholding 3,333, 2,778, 4,761, and 4,880 shares to cover tax obligations tied to earlier stock awards. After these moves, Park beneficially owns 128,201 shares directly. The filing also reports 15,375 performance-based restricted stock units, each linked to one share and vesting based on the company’s share price performance up to a target level by 01/31/2028.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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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^*

Lee Seunghoon

(Last) (First) (Middle)

C/O MAGNACHIP SEMICONDUCTOR, LTD.,

108, YEOUI-DAERO, YEONGDEUNGPO-GU

(Street)

SEOUL M5 07335

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MAGNACHIP SEMICONDUCTOR Corp [ MX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	See Remarks

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/15/2025		A		30,750	A	$0	136,953	D
Common Stock	12/31/2025		A		7,000(1)	A	$2.55	143,953	D
Common Stock	12/31/2025		F		3,333(2)	D	$2.55	140,620	D
Common Stock	12/31/2025		F		2,778(3)	D	$2.55	137,842	D
Common Stock	12/31/2025		F		4,761(4)	D	$2.55	133,081	D
Common Stock	12/31/2025		F		4,880(5)	D	$2.55	128,201	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Performance-Based Restricted Stock Units	(6)	08/15/2025		A		15,375		(7)	01/31/2028	Common Stock	15,375	$0.00	15,375	D

Explanation of Responses:

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

	/s/ Shin Young Park	01/02/2026
	** Signature of Reporting Person	Date
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).
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