MAGNACHIP SEMICONDUCTOR Corp

Securities Trading Plans of Directors and Executive Officers

During our last fiscal quarter, no director or officer, as defined in Rule 16a-1(f), adopted or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” each as defined in Regulation S-K Item 408.

Amendment to Executive Service Agreement of Chief Financial Officer

The following disclosure is provided in lieu of filing a Current Report on Form 8-K under Item 5.02(e) (Compensatory Arrangements of Certain Officers) of Form 8-K:

On August 7, 2026, the Company and Magnachip Semiconductor, Ltd. entered into a letter agreement with Shinyoung Park, the Company’s Chief Financial Officer (the “Amendment”), amending the Amended and Restated Executive Service Agreement dated April 28, 2025, by and among the Company, Magnachip Semiconductor, Ltd. and Ms. Park, as amended by that certain letter agreement dated April 28, 2025 (the “Service Agreement”). Pursuant to the Amendment, the temporary 10% reduction in Ms. Park’s annual base salary was terminated and her annual base salary was reinstated to $360,000 (from the reduced annualized amount of $324,000), effective as of August 7, 2026. Except as expressly modified by the Amendment, all other terms and conditions of the Service Agreement remain unchanged.

The foregoing description of the Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Amendment, a copy of which is filed as Exhibit 10.5 to this Report and is, incorporated herein by reference.