Seunghoon Lee - 15 Aug 2025 Form 4 Insider Report for MAGNACHIP SEMICONDUCTOR Corp (MX)

Reporting relationship: Chief of Manufacturing
Issuer ticker: MX
Reported as of: 15 Aug 2025
Net transaction value: -$22,318
SEC form: 4
Accepted by SEC: 02 Jan 2026, 16:15:06 UTC
Prior SEC filing: 04 Mar 2025
Next SEC filing: 03 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Shin Young Park

Key filing fact

Seunghoon Lee filed Form 4 for MAGNACHIP SEMICONDUCTOR Corp (MX) on 02 Jan 2026.

Key facts

This page summarizes Seunghoon Lee's Form 4 filing for MAGNACHIP SEMICONDUCTOR Corp (MX).
7 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 02 Jan 2026, 16:15.

Change

Previous filing in this sequence was filed on 04 Mar 2025.
Current net transaction value: -$22,318.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002023210 Primary reporting owner

Lee Seunghoon

Relationship: Chief of Manufacturing
Address: C/O MAGNACHIP SEMICONDUCTOR, LTD.,, 108, YEOUI-DAERO, YEONGDEUNGPO-GU, SEOUL, KOREA, REPUBLIC OF
Signature: /s/ Shin Young Park
Signature date: 02 Jan 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MX transaction

Common Stock

Award

Transaction value: $0
Shares: +30,750
Change %: +29%
Price: $0.000000
Shares after: 136,953
Date: 15 Aug 2025
Ownership: Direct

MX transaction

Common Stock

Award

Transaction value: $17,850
Shares: +7,000
Change %: +5.1%
Price: $2.55
Shares after: 143,953
Date: 31 Dec 2025
Ownership: Direct
Footnotes: F1

MX transaction

Common Stock

Tax liability

Transaction value: $8,499
Shares: -3,333
Change %: -2.3%
Price: $2.55
Shares after: 140,620
Date: 31 Dec 2025
Ownership: Direct
Footnotes: F2

MX transaction

Common Stock

Tax liability

Transaction value: $7,084
Shares: -2,778
Change %: -2%
Price: $2.55
Shares after: 137,842
Date: 31 Dec 2025
Ownership: Direct
Footnotes: F3

MX transaction

Common Stock

Tax liability

Transaction value: $12,141
Shares: -4,761
Change %: -3.5%
Price: $2.55
Shares after: 133,081
Date: 31 Dec 2025
Ownership: Direct
Footnotes: F4

MX transaction

Common Stock

Tax liability

Transaction value: $12,444
Shares: -4,880
Change %: -3.7%
Price: $2.55
Shares after: 128,201
Date: 31 Dec 2025
Ownership: Direct
Footnotes: F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MX transaction Derivative

Performance-Based Restricted Stock Units

Award

Transaction value: $0
Shares: +15,375
Change %
Price: $0.000000
Shares after: 15,375
Date: 15 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 15,375
Exercise price
Footnotes: F6, F7

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 7 footnotes

Footnote F1

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.

Footnote F2

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.

Footnote F3

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.

Footnote F4

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.

Footnote F5

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.

Footnote F6

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

Footnote F7

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.

SEC remarks

Chief of Manufacturing