MX / Magnachip Semiconductor Corporation - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Magnachip Semiconductor Corporation
US ˙ NYSE ˙ US55933J2033

Mga Batayang Estadistika
LEI 529900P54J1ATLRBUV29
CIK 1325702
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Magnachip Semiconductor Corporation
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
August 11, 2025 EX-10.1

August 11, 2025

EX-10.1 Exhibit 10.1 August 11, 2025 Via Hand Delivery Mr. Young-Joon Kim [address omitted] Re: Separation Agreement Dear Mr. Kim: This letter agreement (this “Separation Agreement”) confirms our mutual understanding regarding your resignation from the positions of a director and member of the Board of Directors (the “Board”) and Chief Executive Officer (“CEO”) of Magnachip Semiconductor Corporati

August 11, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2025 Magnachip Semiconduc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2025 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

August 11, 2025 EX-99.1

Magnachip Semiconductor Announces YJ Kim to Step Down as CEO Current Board Chairman Camillo Martino Appointed Interim CEO -Board Continues to Explore Strategic Alternatives; CAPEX Plans to Be Cut by Over 50% Through 2027-

EX-99.1 Exhibit 99.1 Magnachip Semiconductor Announces YJ Kim to Step Down as CEO Current Board Chairman Camillo Martino Appointed Interim CEO -Board Continues to Explore Strategic Alternatives; CAPEX Plans to Be Cut by Over 50% Through 2027- SEOUL, South Korea, August 11, 2025 – Magnachip Semiconductor Corporation (NYSE: MX) (“Magnachip” or the “Company”) today announced that YJ Kim has agreed to

August 5, 2025 EX-10.2

Amended and Restated Executive Service Agreement, dated April 28, 2025, by and among Magnachip Semiconductor Corporation, Magnachip Semiconductor, Ltd., and Shin Young Park.

EX-10.2 Exhibit 10.2 Shin Young Park AMENDED AND RESTATED EXECUTIVE SERVICE AGREEMENT This Amended and Restated Executive Service Agreement (this “Agreement”), effective as of April 28, 2025 (the “Effective Date”), is made by and between Shin Young Park (the “Executive”), on the one hand, and Magnachip Semiconductor Corporation, a Delaware corporation (“Parent”), and Magnachip Semiconductor, Ltd.,

August 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from         to         . Commission File Number: 001-34791 Mag

August 5, 2025 EX-10.1

Amendment to Employment Agreement, dated April 28, 2025, by and among Magnachip Semiconductor Corporation, Magnachip Semiconductor, Ltd., and Young-Joon Kim.

EX-10.1 Exhibit 10.1 April 28, 2025 Mr. Young-Joon Kim [address omitted] Re: Amendment to Employment Agreement Dear Mr. Kim, This letter (this “Amendment”) serves as a second amendment to your Employment Agreement, originally entered into on April 26, 2018 (the “Original Agreement”), as previously amended by the certain letter agreement dated September 3, 2018 (the “First Amendment”). The Original

August 5, 2025 EX-10.4

Amended and Restated Director Compensation Policy, dated June 26, 2025.

EX-10.4 Exhibit 10.4 Amended and Restated on June 26, 2025 Magnachip Semiconductor Corporation Director Compensation Policy The Director Compensation Policy applicable to the members of the Board of Directors (the “Board”) of Magnachip Semiconductor Corporation (the “Company”) is as follows: • Each non-employee director will receive a fee of $18,750 per quarter for such director’s service for any

August 5, 2025 EX-10.3

Amendment to Employment Agreement, dated April 28, 2025, by and among Magnachip Semiconductor Corporation, Magnachip Semiconductor, Ltd., and Shin Young Park.

EX-10.3 Exhibit 10.3 April 28, 2025 Ms. Shin Young Park [address omitted] Re: Amendment to Employment Agreement Dear Ms. Park, This letter (this “Amendment”) serves as an amendment to your Amended and Restated Executive Service Agreement, entered into on April 28, 2025 (the “Employment Agreement”). Any capitalized term not otherwise defined in this Amendment shall have the meaning ascribed to such

July 31, 2025 EX-99.1

Magnachip Reports Results for Second Quarter 2025

EX-99.1 Exhibit 99.1 Magnachip Reports Results for Second Quarter 2025 Q2 Results Summary • Consolidated revenue from continuing operations (which includes Power Analog Solutions (“PAS”) and Power IC (“PIC”) businesses) increased 8.1% year-over-year to $47.6 million and was above the mid-point of our guidance range of $45.0 to $49.0 million. • Consolidated gross profit margin from continuing opera

July 31, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 31, 2025 Magnachip Semiconduct

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 31, 2025 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

June 26, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 23, 2025 Magnachip Semiconduct

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 23, 2025 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 30, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jur

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) c/o Magnachip Semiconductor, Ltd. 15F, 76 Ji

May 30, 2025 EX-1.01

Conflict Minerals Report of Magnachip Semiconductor Corporation for the reporting period from January 1, 2024 to December 31, 2024.

EX-1.01 2 d930370dex101.htm EX-1.01 Exhibit 1.01 Magnachip Semiconductor Corporation Conflict Minerals Report For the reporting period from January 1, 2024 to December 31, 2024 This Conflict Minerals Report (this “Report”) of Magnachip Semiconductor Corporation (including its consolidated subsidiaries, the “Company”) has been prepared pursuant to Rule 13p-1 and Form SD promulgated under the Securi

May 23, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2025 Magnachip Semiconduc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2025 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation) (C

May 13, 2025 8-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 8, 2025

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 8, 2025 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction

May 12, 2025 EX-10.2

Form of Restricted Stock Units Agreement—Stock Price Hurdle Performance (CEO GM)

Exhibit 10.2 MAGNACHIP SEMICONDUCTOR CORPORATION RESTRICTED STOCK UNITS AGREEMENT (STOCK PRICE HURDLE PERFORMANCE) Magnachip Semiconductor Corporation (the “Company”) has granted to the Participant named in the Notice of Grant of Stock Price Hurdle Restricted Stock Units (the “Grant Notice”) to which this Restricted Stock Units Agreement (this “Agreement”) is attached an Award consisting of Restri

May 12, 2025 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 12, 2025 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 12, 2025 EX-99.1

Magnachip Reports Results for First Quarter 2025

Exhibit 99.1 Magnachip Reports Results for First Quarter 2025 Q1 Results Summary • Consolidated revenue from continuing operations (which includes Power Analog Solutions (“PAS”) and Power IC (“PIC”) businesses) of $44.7 million was in line with the mid-point of our guidance range of $42.0 to $47.0 million. Excluding Transitional Foundry Services, revenue from continuing operations increased 12.1%

May 12, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 or ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from         to         . Commission File Number: 001-34791 Ma

May 12, 2025 EX-10.1

Amendment to Standard Credit Agreement, dated as of March 31, 2025, by and between Magnachip Semiconductor, Ltd., and Korea Development Bank (English Translation).

Exhibit 10.1 [English Translation] /s/ signatures of the bank’s team member, team manager and deputy general manager of KDB AMENDMENT TO LOAN AGREEMENT (Date: March 31, 2025) The Bank shall explain the important contents of this Amendment (the “Amendment”) to the parties involved in the Amendment and deliver all contract documents, including the Bank’s General Terms and Conditions for Credit Trans

April 30, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 28, 2025 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation)

April 29, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒    Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission Onl

April 8, 2025 8-K

Regulation FD Disclosure, Costs Associated with Exit or Disposal Activities

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 8, 2025 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

April 8, 2025 EX-99.1

Magnachip Announces Plan to Shut Down Display Business by End of Q2 2025 Company to Become a Pure-Play Power Business To Drive Profitable Growth and Maximize Shareholder Value -Company will continue to evaluate opportunities to monetize Display asset

Exhibit 99.1 Magnachip Announces Plan to Shut Down Display Business by End of Q2 2025 Company to Become a Pure-Play Power Business To Drive Profitable Growth and Maximize Shareholder Value -Company will continue to evaluate opportunities to monetize Display assets- SEOUL, South Korea, April 8, 2025 – Magnachip Semiconductor Corporation (NYSE:MX) (“Magnachip” or the “Company”) today announced that

March 14, 2025 EX-16.1

Letter from Samil PricewaterhouseCoopers dated as of March 14, 2025.

Exhibit 16.1 March 14, 2025 Securities and Exchange Commission 100 F Street, N.E. Washington, DC 20549 Commissioners : We have read the statements made by Magnachip Semiconductor Corporation (copy attached), which we understand will be filed with the Securities and Exchange Commission, pursuant to Item 4.01 of Form 8-K/A, as part of the Form 8-K/A of Magnachip Semiconductor Corporation dated March

March 14, 2025 EX-16.1

Letter from Samil PricewaterhouseCoopers dated as of March 14, 2025.

Exhibit 16.1 March 14, 2025 Securities and Exchange Commission 100 F Street, N.E. Washington, DC 20549 Commissioners : We have read the statements made by Magnachip Semiconductor Corporation (copy attached), which we understand will be filed with the Securities and Exchange Commission, pursuant to Item 4.01 of Form 8-K, as part of the Form 8-K of Magnachip Semiconductor Corporation dated March 11,

March 14, 2025 8-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 11, 2025

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K/A (Amendment No.

March 14, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 11, 2025 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 14, 2025 EX-10.44

Standard Credit Agreement, dated as of December 16, 2024, by and between Magnachip Semiconductor, Ltd. and Korea Development Bank. (English Translation).

Exhibit 10.44 [English Translation] /s/ signatures of the bank’s team member, team manager and deputy general manager of KDB Loan Agreement Date: December 16, 2024 The Bank shall explain the important contents of this loan agreement (the “Agreement”) to the parties involved in the Agreement and deliver all contract documents, including the Bank’s General Terms and Conditions for Credit Transaction

March 14, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PUR

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from       to       Commission File Nu

March 14, 2025 EX-21.1

Subsidiaries of the Registrant

Exhibit 21.1 SUBSIDIARIES OF MAGNACHIP SEMICONDUCTOR CORPORATION Subsidiary Jurisdiction of Incorporation MagnaChip Semiconductor S.A. Luxembourg MagnaChip Semiconductor B.V. The Netherlands Magnachip Semiconductor, Ltd. Korea Magnachip Mixed-Signal, Ltd. Korea MagnaChip Semiconductor SA Holdings LLC Delaware MagnaChip Semiconductor Limited Taiwan Magnachip Semiconductor Limited Hong Kong SAR Magn

March 14, 2025 EX-4.1

Description of Securities

Exhibit 4.1 DESCRIPTION OF REGISTRANT’S SECURITIES The following brief description of the capital stock of Magnachip Semiconductor Corporation (“us”, “our”, “we”, or the “Company”) is a summary. This summary is not complete and is subject to and qualified in its entirety by reference to the complete text of our Certificate of Incorporation (“Certificate of Incorporation”), and our Amended and Rest

March 14, 2025 EX-10.42

Amendment to Kun-Pledge (Mortgage) Agreement, dated as of December 8, 2024, by and between Magnachip Semiconductor, Ltd. and Korea Development Bank. (English Translation).

Exhibit 10.42 [English Translation]  Stamp  Duty Team Member Team Manager Assistant Branch Manager AMENDMENT TO KUN-MORTGAGE AGREEMENT (Increase of the Maximum Mortgage Amount) Creditor & Mortgagee: The Korea Development Bank Obligor: Magnachip Semiconductor, Ltd. Mortgagor: Magnachip Semiconductor, Ltd. Description of the Mortgaged Property: Same as listed in Attachment 1. The Mortgagor and the O

March 14, 2025 EX-19.1

Securities Trading Policy

Exhibit 19.1 MAGNACHIP SEMICONDUCTOR CORPORATION SECURITIES TRADING POLICY Effective December 13, 2018 I. Purpose MagnaChip Semiconductor Corporation and its subsidiaries (the “Company”) have adopted this Securities Trading Policy (this “Policy”) for directors, officers and employees of the Company. The purpose of this Policy is to describe the standards concerning the handling of non-public infor

March 14, 2025 EX-10.43

Amendment to Kun-Pledge (Mortgage) Agreement, dated as of December 8, 2024, by and between Magnachip Semiconductor, Ltd. and Korea Development Bank. (English Translation).

Exhibit 10.43 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. SUCH EXCLUDED INFORMATION HAS BEEN MARKED WITH “[***].” [English Translation] Stamp Duty ARM (S)RM Amendment to Kun-Mortgage Agreement (Conversion of the General Mortgage to a Mortgage under Articles 3 and 4 of the Fa

March 12, 2025 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 12, 2025 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 12, 2025 EX-99.1

Magnachip Reports Results for Fourth Quarter and Full-Year 2024 -Announces Transition to Become Pure-Play Power Company; Explores All Strategic Options for Display Business -

Exhibit 99.1 Magnachip Reports Results for Fourth Quarter and Full-Year 2024 -Announces Transition to Become Pure-Play Power Company; Explores All Strategic Options for Display Business - Q4 Results Summary • Consolidated revenue of $63 million was above the mid-point of our guidance range of $59.0 to $64.0 million. • Standard Product business revenue was down 5.1% sequentially due primarily to se

February 12, 2025 EX-1

JOINT FILING AGREEMENT

EX-1 2 exhibit1.htm Exhibit 1 JOINT FILING AGREEMENT This Joint Filing Agreement, dated as of February 12, 2025, is by and among Clearline Capital LP, Clearline Capital LLC and Marc Majzner (collectively, the “Filers”). Each of the Filers may be required to file with the United States Securities and Exchange Commission a statement on Schedule 13D and/or 13G with respect to shares of Common Stock o

January 2, 2025 EX-99.1

Joint Filing Agreement

Exhibit 99.1 Joint Filing Agreement The undersigned hereby agree that the Statement on Schedule 13G dated January 2, 2025 with respect to the Common Stock, par value $0.01 per share, of Magnachip Semiconductor Corporation, a Delaware corporation, and any further amendments thereto executed by each and any of the undersigned shall be filed on behalf of each of the undersigned pursuant to and in acc

December 19, 2024 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 16, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

November 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30 , 2024 or ☐ TRANSITION REPORT PURS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30 , 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from         to         . Commission File Number: 001-347

October 30, 2024 EX-99.1

Magnachip Reports Results for Third Quarter 2024

Exhibit 99.1 Magnachip Reports Results for Third Quarter 2024 Financial Highlights • Q3 consolidated revenue was $66.5 million, at the high-end of guidance range of $61.5-66.5 million. • Q3 standard product business revenue was up 25.9% sequentially. • Q3 consolidated gross profit margin of 23.3% was in-line with the mid-point of guidance range of 22.5-24.5%. • Q3 standard product business gross p

October 30, 2024 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 30, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

August 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 or ☐ TRANSITION REPORT PURSUANT T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from         to         . Commission File Number: 001-34791 Mag

July 31, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 31, 2024 Magnachip Semiconduct

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 31, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

July 31, 2024 EX-10.2

Consulting Agreement, dated as of August 1, 2024, by and between Magnachip Mixed-Signal, Ltd. and Woungmoo Lee (incorporated by reference to our Current Report on Form 8-K filed on July 31, 2024).

Exhibit 10.2 MAGNACHIP MIXED-SIGNAL, LTD. CONSULTING AGREEMENT This Consulting Agreement (this “Agreement”) is entered into as of August 1, 2024 (the “Effective Date”), by and between MAGNACHIP MIXED-SIGNAL, LTD. (“MMS”), a company established under the laws of the Republic of Korea, and WOUNGMOO LEE (“Consultant”). For the purposes of this Agreement, MMS and its affiliates that may receive servic

July 31, 2024 EX-99.1

Magnachip Reports Results for Second Quarter 2024

Exhibit 99.1 Magnachip Reports Results for Second Quarter 2024 Financial Highlights • Q2 consolidated revenue was $53.2 million, above the mid-point of guidance range of $49-54 million. • Q2 standard product business revenue was up 11.6% sequentially. • Q2 consolidated gross profit margin was 21.8%, above the upper end of guidance range of 17-19%. • Q2 standard product business gross profit margin

July 31, 2024 EX-10.1

Separation Agreement, dated as of July 29, 2024, by and among Magnachip Semiconductor Corporation, Magnachip Semiconductor, Ltd., Magnachip Mixed-Signal, Ltd. and Woungmoo Lee (incorporated by reference to our Current Report on Form 8-K filed on July 31, 2024).

Exhibit 10.1 July 29, 2024 Via Hand Delivery Mr. Woungmoo Lee [address omitted] Re: Separation Agreement Dear Mr. Lee: This letter agreement (this “Separation Agreement”) confirms our mutual understanding regarding your resignation from the position of Executive Vice President and General Manager of Mixed-Signal Solutions of Magnachip Semiconductor Corporation, a Delaware corporation (“MSC”), and

July 31, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2024 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation) (

June 20, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 13, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 30, 2024 EX-1.01

Magnachip Semiconductor Corporation Conflict Minerals Report For the reporting period from January 1, 2023 to December 31, 2023

Exhibit 1.01 Magnachip Semiconductor Corporation Conflict Minerals Report For the reporting period from January 1, 2023 to December 31, 2023 This Conflict Minerals Report (this “Report”) of Magnachip Semiconductor Corporation (including its consolidated subsidiaries, the “Company”) has been prepared pursuant to Rule 13p-1 and Form SD promulgated under the Securities Exchange Act of 1934 for the re

May 30, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jur

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) c/o Magnachip Semiconductor, Ltd. 15F, 76 Ji

May 10, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from     to    . Commission File Number: 001-34791 Magnachip S

May 10, 2024 EX-10.2

Standard Credit Agreement, dated as of March 26, 2024, by and between Magnachip Semiconductor, Ltd. and Korea Development Bank. (English Translation)

Exhibit 10.2 [English Translation] /s/ signatures of the bank’s team member, team manager and deputy general manager of KDB Loan Agreement Date: March 26, 2024 The Bank shall explain the important contents of this loan agreement (the “Agreement”) to the parties involved in the Agreement and deliver all contract documents, including the Bank’s General Terms and Conditions for Credit Transactions (f

May 10, 2024 EX-10.3

Kun-Pledge (Mortgage) Agreement, dated as of March 26, 2024, by and between Magnachip Semiconductor, Ltd. and Korea Development Bank. (English Translation)

Exhibit 10.3 [English Translation] Kun-Security Team Member Team Manager General Manager KUN- MORTGAGE AGREEMENT Date: March 26, 2024 The Bank shall explain all the material terms of this Agreement and shall deliver a copy of the General Terms and Conditions for Credit Transactions and this Agreement, to the Mortgagor. « Providing collateral to secure debt is a serious legal act with potentially a

May 2, 2024 EX-99.1

Magnachip Reports Results for First Quarter 2024

Exhibit 99.1 Magnachip Reports Results for First Quarter 2024 Financial Highlights • Q1 consolidated revenue was $49.1 million, within our guidance range of $46-51 million. • Q1 standard product business revenue was up 10.6% sequentially. • Q1 consolidated gross profit margin was 18.3%, within our guidance range of 17-20%. • Q1 standard product business gross profit margin was down 170 basis point

May 2, 2024 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 2, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

April 29, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒    Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, For Use of the Commission Onl

March 29, 2024 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 26, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 26, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 22, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 26, 2024 EX-10.1

Separation Agreement, dated as of March 22, 2024, by and among Magnachip Semiconductor Corporation, Magnachip Semiconductor, Ltd. and Chan Ho Park (incorporated by reference to our Current Report on Form 8-K filed on March 26, 2024).

Exhibit 10.1 March 22, 2024 Via Hand Delivery Dr. Chan Ho Park Lake Palace Apt. 128-1502 88 Jamsil-ro, Songpa-gu, Seoul, Korea Re: Separation Agreement Dear Dr. Park: This letter agreement (this “Separation Agreement”) confirms our mutual understanding regarding your resignation from the position of Co-General Manager of Power Analog Solutions of Magnachip Semiconductor Corporation, a Delaware cor

March 8, 2024 EX-21.1

Subsidiaries of the Registrant

Exhibit 21.1 SUBSIDIARIES OF MAGNACHIP SEMICONDUCTOR CORPORATION Subsidiary Jurisdiction of Incorporation MagnaChip Semiconductor S.A. Luxembourg MagnaChip Semiconductor B.V. The Netherlands Magnachip Semiconductor, Ltd. Korea Magnachip Mixed-Signal, Ltd. Korea MagnaChip Semiconductor SA Holdings LLC Delaware MagnaChip Semiconductor Limited Taiwan Magnachip Semiconductor Limited Hong Kong SAR Magn

March 8, 2024 EX-97.1

Compensation Recovery Policy, adopted as of November 15, 2023

Exhibit 97.1 MAGNACHIP SEMICONDUCTOR CORPORATION COMPENSATION RECOVERY POLICY Adopted as of November 15, 2023 Magnachip Semiconductor Corporation, a Delaware corporation (the “Company”), has adopted this Compensation Recovery Policy (this “Policy”) as described below. This Policy is effective as of October 2, 2023 (the “Effective Date”) and replaces, effective as of that date, the Company’s Clawba

March 8, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PUR

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from       to       Commission File Nu

March 8, 2024 EX-4.1

Description of Securities

Exhibit 4.1 DESCRIPTION OF REGISTRANT’S SECURITIES The following brief description of the capital stock of Magnachip Semiconductor Corporation (“us”, “our”, “we”, or the “Company”) is a summary. This summary is not complete and is subject to and qualified in its entirety by reference to the complete text of our Certificate of Incorporation (“Certificate of Incorporation”), and our Amended and Rest

February 28, 2024 EX-99.1

Magnachip Reports Results for Fourth Quarter and Full-Year 2023 Announces successful design-wins with Smartphone Chinese OEMs

Exhibit 99.1 Magnachip Reports Results for Fourth Quarter and Full-Year 2023 Announces successful design-wins with Smartphone Chinese OEMs Financial Highlights • Q4 revenue of $50.8 million was near the low-end of our guidance range. • Q4 gross profit margin was 22.7%, near the low-end of our guidance range. • Ended Q4 with no debt and cash of $158.1 million. • Repurchased approximately $8.2 milli

February 28, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 28, 2024 Magnachip Semicon

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 28, 2024 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

February 14, 2024 SC 13G/A

MX / Magnachip Semiconductor Corporation / ALLIANCEBERNSTEIN L.P. - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Magnachip Semiconductor Corp (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whic

February 13, 2024 SC 13G/A

MX / Magnachip Semiconductor Corporation / Toronado Partners, LLC - AMENDMENT NO. 4 Passive Investment

SC 13G/A 1 mx29240sc13ga4.htm AMENDMENT NO. 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2023 (Date of Event which Requires Filing of this Statement) Check the ap

November 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 or ☐ TRANSITION REPORT PURSU

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34

November 2, 2023 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 2, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

November 2, 2023 EX-99.1

Magnachip Reports Results for Third Quarter 2023

EX-99.1 Exhibit 99.1 Magnachip Reports Results for Third Quarter 2023 • Revenue of $61.2 million was in-line with guidance. • Gross profit margin of 23.6% increased 140 basis points from Q2, mainly driven by higher fab utilization. • GAAP diluted loss per share was $0.13. • Non-GAAP diluted loss per share was $0.04. • Completed $5.4 million of stock buybacks during Q3. • Ended Q3 with a solid bala

September 6, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 6, 2023 Magnachip Semicon

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 6, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

September 6, 2023 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION ANNOUNCES RESIGNATION OF MEL KEATING AS A MEMBER OF THE BOARD OF DIRECTORS

EX-99.1 Exhibit 99.1 MAGNACHIP SEMICONDUCTOR CORPORATION ANNOUNCES RESIGNATION OF MEL KEATING AS A MEMBER OF THE BOARD OF DIRECTORS SEOUL, South Korea, September 6, 2023 — Magnachip Semiconductor Corporation (NYSE: MX) (“Magnachip” or the “Company”) received a letter of resignation, dated September 5, 2023, from Mr. Mel Keating, a member of the board of directors of the Company (the “Board”), whos

August 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 or ☐ TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34791 M

August 7, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 7, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

August 7, 2023 EX-99.1

Magnachip Reports Results for Second Quarter 2023 Announces New $50 Million Stock Buyback Program

EX-99.1 Exhibit 99.1 Magnachip Reports Results for Second Quarter 2023 Announces New $50 Million Stock Buyback Program • Revenue of $61.0 million was in-line with guidance (vs $60.5M mid-point) and was down 39.8% YoY and up 7% sequentially. • Gross profit margin was 22.2%, up 100 basis points from Q1. The sequential improvement was primarily driven by higher utilization at our Gumi Fab. • GAAP dil

July 26, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 24, 2023 Magnachip Semiconduct

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 24, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

July 17, 2023 EX-99.1

MAGNACHIP ANNOUNCES DIRECTOR RESIGNATION

EX-99.1 Exhibit 99.1 MAGNACHIP ANNOUNCES DIRECTOR RESIGNATION SEOUL, South Korea, July 17, 2023 — Magnachip Semiconductor Corporation (NYSE: MX) (“Magnachip” or the “Company”) today announced that Gary Tanner has notified the Company of his intention to resign from the Company’s Board of Directors. The Board has accepted his resignation, which was effective as of July 14, 2023. Mr. Tanner joined M

July 17, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 14, 2023 Magnachip Semiconduct

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 14, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

June 23, 2023 S-8

As filed with the Securities and Exchange Commission on June 23, 2023

S-8 As filed with the Securities and Exchange Commission on June 23, 2023 Registration No.

June 23, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 18, 2023 Magnachip Semiconducto

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 18, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

June 23, 2023 EX-FILING FEES

Filing fee table*

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) Magnachip Semiconductor Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common stock, par value $0.

May 30, 2023 EX-1.01

Conflict Minerals Report of Magnachip Semiconductor Corporation for the reporting period from January 1, 2022 to December 31, 2022

Exhibit 1.01 Magnachip Semiconductor Corporation Conflict Minerals Report For the reporting period from January 1, 2022 to December 31, 2022 This Conflict Minerals Report (this “Report”) of Magnachip Semiconductor Corporation (including its consolidated subsidiaries, the “Company”) has been prepared pursuant to Rule 13p-1 and Form SD promulgated under the Securities Exchange Act of 1934 for the re

May 30, 2023 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jur

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) c/o Magnachip Semiconductor, Ltd. 15F, 76 Ji

May 23, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 19, 2023 Magnachip Semiconducto

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 19, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 19, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 18, 2023 Magnachip Semiconducto

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 18, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 15, 2023 SC 13G

MX / MagnaChip Semiconductor Corp / OAKTREE CAPITAL MANAGEMENT LP - SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 55933J203 (CUSIP Number) May 5, 2023 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate

May 8, 2023 10-Q

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-34791 Magnachip Semicondu

May 3, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 3, 2023 Magnachip Semiconductor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 3, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 3, 2023 EX-99.1

Magnachip Reports Results for First Quarter 2023

Exhibit 99.1 Magnachip Reports Results for First Quarter 2023 • Revenue of $57.0 million was within our guidance range. YoY, our revenue decreased 45.2% primarily due to continued effects of last year’s 28nm wafer supply shortage that impacted second half 2022 design-wins and the ongoing inventory correction driven by weak consumer demand. • Gross profit margin was 21.2%, at the low end of our gui

May 1, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

May 1, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 28, 2023 Magnachip Semiconduc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 28, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 1, 2023 EX-99.1

Magnachip Announces CFO Maternity Leave

EX-99.1 Exhibit 99.1 Magnachip Announces CFO Maternity Leave SEOUL, South Korea, May 1, 2023— Magnachip Semiconductor Corporation (“Magnachip” or the “Company”) (NYSE: MX) announced today that Shin Young Park, the Company’s Chief Financial Officer and the principal financial and accounting officer, went on maternity leave. In Ms. Park’s absence, the Board of Directors of the Company appointed Mr.

April 17, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant  ☐ Check the appropriate box:  ☐ Preliminary Proxy Statement  ☐ Confidential, For Use of the Commission Onl

April 13, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 11, 2023 Magnachip Semiconduc

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 11, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

April 13, 2023 EX-10.1

Agreement, dated as of April 11, 2023, by and among Magnachip Semiconductor Corporation, Jackson Square Advisors LLC, GT Investments II Corp and Gilbert Nathan (incorporated by reference to Exhibit 10.1 to our Current Report on form 8-K filed on April 13, 2023).

EX-10.1 Exhibit 10.1 AGREEMENT This Agreement (this “Agreement”) is made and entered into as of April 11, 2023, by and among Magnachip Semiconductor Corporation (the “Company”), Jackson Square Advisors LLC (“Jackson”), GT Investments II Corp (“GTI”) and Gilbert Nathan (in his capacity as a stockholder of the Company and together with Jackson and GTI, collectively, “Stockholder”) (each of the Compa

April 13, 2023 EX-99.1

Magnachip to Appoint Shareholder Gilbert Nathan to the Board of Directors

EX-99.1 Exhibit 99.1 Magnachip to Appoint Shareholder Gilbert Nathan to the Board of Directors SEOUL, South Korea, April 13, 2023 — Magnachip Semiconductor Corporation (“Magnachip” or the “Company”) (NYSE: MX) announced today that shareholder Gilbert Nathan will join its Board of Directors pursuant to the terms of an agreement (the “Agreement”) entered into with Mr. Nathan and two of his affiliate

February 22, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PUR

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-347

February 22, 2023 EX-4.1

Description of Securities

EX-4.1 Exhibit 4.1 DESCRIPTION OF REGISTRANT’S SECURITIES The following brief description of the capital stock of Magnachip Semiconductor Corporation (“us”, “our”, “we”, or the “Company”) is a summary. This summary is not complete and is subject to and qualified in its entirety by reference to the complete text of our Certificate of Incorporation (“Certificate of Incorporation”), and our Amended a

February 16, 2023 EX-99.1

Magnachip Reports Results for Fourth Quarter and Full-Year 2022

EX-99.1 Exhibit 99.1 Magnachip Reports Results for Fourth Quarter and Full-Year 2022 • Fourth quarter revenue of $61.0 million was near the high-end of our guidance range. YoY, our revenue decreased 44.7% primarily due to severe 28nm wafer shortages required for our Display business. • Full-year revenue of $337.7 million decreased 28.8% YoY due to significantly lower Display revenue as a result of

February 16, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 16, 2023 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

February 14, 2023 SC 13G/A

MX / Magnachip Semiconductor Corp / Toronado Partners, LLC - AMENDMENT NO. 3 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2022 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant t

February 14, 2023 SC 13G

MX / Magnachip Semiconductor Corp / ALLIANCEBERNSTEIN L.P. - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Magnachip Semiconductor Corp (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

November 14, 2022 CORRESP

Magnachip Semiconductor, 40F, Parc.1 Tower 2, 108, Yeoui-daero, Yeongdeungpo-gu, Seoul, South Korea 07335

November 14, 2022 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.

November 8, 2022 EX-10.4

Form of 2020 Plan Restricted Stock Units Agreement—Financial Performance (Non-CEO Section 16 Officers) (incorporated by reference to Exhibit 10.4 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.4 Exhibit 10.4 MAGNACHIP SEMICONDUCTOR CORPORATION PERFORMANCE-BASED RESTRICTED STOCK UNITS AGREEMENT Magnachip Semiconductor Corporation (the “Company”) has granted to the Participant named in the Notice of Grant of Performance-Based Restricted Stock Units (the “Grant Notice”) to which this Performance-Based Restricted Stock Units Agreement (this “Agreement”) is attached an Award consisting

November 8, 2022 EX-10.7

Second Amendment to Termination and Settlement Agreement, dated as of August 5, 2022, by and between Magnachip Semiconductor Corporation, South Dearborn Limited and Wise Road Capital LTD.

EX-10.7 Exhibit 10.7 EXECUTION VERSION SECOND AMENDMENT TO TERMINATION AND SETTLEMENT AGREEMENT This Second Amendment to Termination and Settlement Agreement (this “Amendment”) is entered into as of August 5, 2022, by and among South Dearborn Limited, an exempted company incorporated in the Cayman Islands with limited liability (“Parent”), Magnachip Semiconductor Corporation, a Delaware corporatio

November 8, 2022 EX-10.1

Form of 2020 Plan Restricted Stock Units Agreement (Non-employee Directors) (incorporated by reference to Exhibit 10.1 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.1 Exhibit 10.1 MAGNACHIP SEMICONDUCTOR CORPORATION RESTRICTED STOCK UNITS AGREEMENT Magnachip Semiconductor Corporation (the “Company”) has granted to the Participant named in the Notice of Grant of Restricted Stock Units (the “Grant Notice”) to which this Restricted Stock Units Agreement is attached an Award consisting of Restricted Stock Units subject to the terms and conditions set forth

November 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 or ☐ TRANSITION REPORT PURSU

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34

November 8, 2022 EX-10.9

First Amendment to the Patent Cross-License Agreement, with an effective date as of January 1, 2022, by and between Infineon Technologies AG and Magnachip Semiconductor, Ltd. (incorporated by reference to Exhibit 10.9 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.9 Exhibit 10.9 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL FIRST AMENDMENT TO THE PATENT CROSS-LICENSE AGREEMENT This Amendment to the Patent Cross-License Agreement (“FIRST AMENDMENT”) is entered into with effect as of January 1, 2

November 8, 2022 EX-10.3

Form of 2020 Plan Restricted Stock Units Agreement—Financial Performance (CEO) (incorporated by reference to Exhibit 10.3 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.3 Exhibit 10.3 MAGNACHIP SEMICONDUCTOR CORPORATION PERFORMANCE-BASED RESTRICTED STOCK UNITS AGREEMENT Magnachip Semiconductor Corporation (the “Company”) has granted to the Participant named in the Notice of Grant of Performance-Based Restricted Stock Units (the “Grant Notice”) to which this Performance-Based Restricted Stock Units Agreement (this “Agreement”) is attached an Award consisting

November 8, 2022 EX-10.8

Patent Cross-License Agreement, with an effective date as of June 15, 2017, by and between Infineon Technologies AG and Magnachip Semiconductor, Ltd. (incorporated by reference to Exhibit 10.8 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.8 Exhibit 10.8 [***] CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY [***], HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL MagnaChip/Infineon Confidential PATENT CROSS-LICENSE AGREEMENT This Patent Cross-License Agreement (“AGREEMENT”) is entered into on June 15, 2017 (“EFFECTIVE DATE”) by

November 8, 2022 EX-10.5

Form of 2020 Plan Restricted Stock Units Agreement—TSR Performance (CEO) (incorporated by reference to Exhibit 10.5 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.5 Exhibit 10.5 MAGNACHIP SEMICONDUCTOR CORPORATION RESTRICTED STOCK UNITS AGREEMENT (TSR PERFORMANCE) Magnachip Semiconductor Corporation (the “Company”) has granted to the Participant named in the Notice of Grant of TSR Restricted Stock Units (the “Grant Notice”) to which this Restricted Stock Units Agreement (this “Agreement”) is attached an Award consisting of Restricted Stock Units subje

November 8, 2022 EX-10.2

Form of 2020 Plan Restricted Stock Units Agreement (CEO and other Section 16 Officers) (incorporated by reference to Exhibit 10.2 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.2 Exhibit 10.2 MAGNACHIP SEMICONDUCTOR CORPORATION RESTRICTED STOCK UNITS AGREEMENT Magnachip Semiconductor Corporation (the “Company”) has granted to the Participant named in the Notice of Grant of Restricted Stock Units (the “Grant Notice”) to which this Restricted Stock Units Agreement (this “Agreement”) is attached an Award consisting of Restricted Stock Units subject to the terms and co

November 8, 2022 EX-10.6

Form of 2020 Plan Restricted Stock Units Agreement—TSR Performance (Non-CEO Section 16 Officers) (incorporated by reference to Exhibit 10.6 to our Quarterly Report on Form 10-Q filed on November 4, 2022)

EX-10.6 Exhibit 10.6 MAGNACHIP SEMICONDUCTOR CORPORATION RESTRICTED STOCK UNITS AGREEMENT (TSR PERFORMANCE) Magnachip Semiconductor Corporation (the “Company”) has granted to the Participant named in the Notice of Grant of TSR Restricted Stock Units (the “Grant Notice”) to which this Restricted Stock Units Agreement (this “Agreement”) is attached an Award consisting of Restricted Stock Units subje

November 4, 2022 EX-99.1

Magnachip Reports Results for Third Quarter 2022

Exhibit 99.1 CORRECTING and REPLACING Magnachip Reports Results for Third Quarter 2022 SEOUL, South Korea, November 4, 2022 ? Magnachip Semiconductor Corporation (NYSE: MX) (?Magnachip? or the ?Company?) today is correcting an error to its press release issued on November 2, 2022 announcing the Company?s financial results for the third quarter of 2022. Subsequent to the furnishing of the press rel

November 4, 2022 8-K/A

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2022 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporati

November 2, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 2, 2022 Magnachip Semicond

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 2, 2022 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

November 2, 2022 EX-99.1

Magnachip Reports Results for Third Quarter 2022

EX-99.1 Exhibit 99.1 Magnachip Reports Results for Third Quarter 2022 • Revenue of $71.2 million was within our guidance range. The year-over-year and sequential decline were primarily driven by the supply shortages of OLED wafers in the 2nd half of this year that impacted design-in projects from our large panel customer in Korea. • Gross profit margin was 24.2%, below the low end of our guidance

September 13, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 12, 2022 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

September 13, 2022 EX-99.1

Magnachip Announces Expanded Stock Repurchase Program

EXHIBIT 99.1 Magnachip Announces Expanded Stock Repurchase Program SEOUL, South Korea, September 12, 2022 - Magnachip Semiconductor Corporation (NYSE: MX) (?Magnachip? or the ?Company?) today announced that the Board of Directors has authorized an expansion of the Company?s previously announced stock repurchase program from $75 million to $87.5 million of the Company's common stock. The Company ha

August 9, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ☐ TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34791 M

August 8, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2022 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

August 8, 2022 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of U.S. dollars, except share data) Three Months Ended Six Months Ended June 30, 2022 March 31, 2022 June 30, 2021 June 30, 2022 June 30, 2021 Re

Exhibit 99.1 Magnachip Reports Results for Second Quarter 2022 and Reaffirms Previously-Announced Stock Buyback Program ? Revenue of $101.4 million was down 2.6% sequentially and down 11.0% year-over-year (YoY). The YoY decrease was mainly due to severe supply shortages for 28nm 12? OLED wafers, partially offset by an 11.1% YoY increase in Power solutions business revenue. ? Gross profit margin wa

May 27, 2022 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jur

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) c/o MagnaChip Semiconductor S.A. 1, All?e Sc

May 27, 2022 EX-1.01

Conflict Minerals Report of Magnachip Semiconductor Corporation for the reporting period from January 1, 2021 to December 31, 2021

Exhibit 1.01 Magnachip Semiconductor Corporation Conflict Minerals Report For the reporting period from January 1, 2021 to December 31, 2021 This Conflict Minerals Report (this ?Report?) of Magnachip Semiconductor Corporation (including its consolidated subsidiaries, the ?Company?) has been prepared pursuant to Rule 13p-1 and Form SD promulgated under the Securities Exchange Act of 1934 for the re

May 6, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 PART I—FINANCIAL INFORMATION Item 1. Interim Consolidated Financial Statements (Unaudited) MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (Unaud

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34791

May 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 3, 2022 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 3, 2022 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of U.S. dollars, except share data) Three Months Ended March 31, 2022 December 31, 2021 March 31, 2021 Revenues: Net sales – standard products bu

Exhibit 99.1 Magnachip Reports Results for First Quarter 2022 ? Revenue of $104.1 million was down 5.7% sequentially and down 15.4% year-over-year (YoY). The decrease was mainly due to a 29.3% sequential decline in Display solutions revenue as a result of continued severe supply shortage of 28nm 12? OLED wafers, partially offset by record revenue in our Power solutions business, which was up 11.4%

April 25, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 21, 2022 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

April 6, 2022 EX-10.1

First Amendment to Termination and Settlement Agreement, dated as of April 4, 2022, by and between Magnachip Semiconductor Corporation, South Dearborn Limited and Wise Road Capital LTD. (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K filed on April 6, 2022).

Exhibit 10.1 EXECUTION VERSION FIRST AMENDMENT TO TERMINATION AND SETTLEMENT AGREEMENT This First Amendment to Termination and Settlement Agreement (this ?Amendment?) is entered into as of April 4, 2022, by and among South Dearborn Limited, an exempted company incorporated in the Cayman Islands with limited liability (?Parent?), Magnachip Semiconductor Corporation, a Delaware corporation (the ?Com

April 6, 2022 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 4, 2022 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

March 21, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, For Use of the Commission Only (

March 14, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 14, 2022 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation)

March 14, 2022 EX-99.1

Magnachip Completes $37.5 Million Accelerated Stock Repurchase

Exhibit 99.1 Magnachip Completes $37.5 Million Accelerated Stock Repurchase SEOUL, South Korea, March 14, 2022 ? Magnachip Semiconductor Corporation (?Magnachip Corp.? or the ?Company?) (NYSE: MX), announced today that the Company has completed its previously announced repurchase of $37.5 million of its common stock, pursuant to its accelerated stock repurchase agreement (the ?ASR Agreement?) with

February 23, 2022 EX-4.1

Description of Securities

Exhibit 4.1 DESCRIPTION OF REGISTRANT?S SECURITIES The following brief description of the capital stock of Magnachip Semiconductor Corporation (?us?, ?our?, ?we?, or the ?Company?) is a summary. This summary is not complete and is subject to and qualified in its entirety by reference to the complete text of our Certificate of Incorporation (?Certificate of Incorporation?), and our Amended and Rest

February 23, 2022 EX-10.30

Executive Service Agreement, effective as of February 23, 2022, by and between Shin Young Park, Magnachip Semiconductor Corporation and Magnachip Semiconductor, Ltd. (incorporated by reference to Exhibit 10.30 to our Annual Report on Form 10-K filed on February 23, 2022)

Exhibit 10.30 EXECUTIVE SERVICE AGREEMENT This Executive Service Agreement (this ?Agreement?), effective as of February 23, 2022 (the ?Effective Date?), is made by and between Shin Young Park (the ?Executive?), on the one hand, and Magnachip Semiconductor Corporation, a Delaware corporation (?Parent?), and Magnachip Semiconductor, Ltd., a wholly owned subsidiary of Parent (?MSK? and together with

February 23, 2022 EX-21.1

Subsidiaries of the Registrant

Exhibit 21.1 SUBSIDIARIES OF MAGNACHIP SEMICONDUCTOR CORPORATION Subsidiary Jurisdiction of Incorporation MagnaChip Semiconductor S.A. Luxembourg MagnaChip Semiconductor B.V. The Netherlands Magnachip Semiconductor, Ltd. Korea MagnaChip Semiconductor SA Holdings LLC Delaware MagnaChip Semiconductor Limited Taiwan Magnachip Semiconductor Limited Hong Kong SAR Magnachip Semiconductor Inc. Japan Magn

February 23, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-347

February 16, 2022 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of U.S. dollars, except share data) Three Months Ended Year Ended December 31, September 30, December 31, December 31, December 31, 2021 2021 202

Exhibit 99.1 Magnachip Reports Results for Fourth Quarter and Year 2021 ? Fourth quarter revenue of $110.3 million was down 13.1% sequentially and down 22.8% year-over-year (YoY) due mainly to severe supply shortages especially for 28nm 12? OLED wafers; Full-year revenue of $474.2 million decreased 6.5% YoY due primarily to a revenue decrease in our OLED business due to wafer supply shortages, off

February 16, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 16, 2022 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

February 14, 2022 SC 13G/A

MX / Magnachip Semiconductor Corp / Rubric Capital Management LP - SC 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* MagnaChip Semiconductor Corporation (Name of Issuer) Common stock, $0.01 par value per share (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2021 (Date of event which requires filing of this statement) Check the appropriate box to designate the

February 14, 2022 SC 13G/A

MX / Magnachip Semiconductor Corp / OAKTREE CAPITAL MANAGEMENT LP - AMENDMENT NO. 5 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to de

February 11, 2022 SC 13G/A

MX / Magnachip Semiconductor Corp / Toronado Partners, LLC - AMENDMENT NO. 2 Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant t

January 31, 2022 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 31, 2022 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation

January 7, 2022 8-K

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 4, 2022 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation)

January 3, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 29, 2021 Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporatio

January 3, 2022 EX-10.1

Separation Agreement, dated as of December 29, 2021, by and among the Company, MSK and Young Soo Woo.

Exhibit 10.1 December 29, 2021 Via Hand Delivery Dr. Young Soo Woo 101-204 Koduk-ro 333, Kangdong-gu Seoul, Korea Re: Separation Agreement Dear Dr. Woo: This letter agreement (this ?Separation Agreement?) confirms our mutual understanding regarding your resignation from the position of Chief Financial Officer of Magnachip Semiconductor Corporation, a Delaware corporation (?MSC?), and of Magnachip

January 3, 2022 EX-99.1

Magnachip Semiconductor Names Ms. Shinyoung Park as Chief Financial Officer

Exhibit 99.1 Magnachip Semiconductor Names Ms. Shinyoung Park as Chief Financial Officer SEOUL, South Korea, January 3, 2022 ? Magnachip Semiconductor Corporation (?Magnachip? or the ?Company?) (NYSE: MX) announced today that Ms. Shinyoung Park has been promoted to Chief Financial Officer, effective as of January 1, 2022. Ms. Park succeeds Dr. Young Soo Woo, who stepped down from the position effe

December 23, 2021 EX-10.1

ASR Agreement dated December 21, 2021 by and between Magnachip Semiconductor Corporation and JPMorgan Chase Bank, National Association.

Exhibit 10.1 JPMorgan Chase Bank, National Association New York Branch 383 Madison Avenue New York, NY, 10179 December 21, 2021 To: Magnachip Semiconductor V-PLEX Bldg., 15th Fl. 501, Teheran-ro, Gangnam-gu Seoul, 06168, Republic of Korea Attention: Theodore S. Kim, Chief Compliance Officer and General Counsel Re: Master Confirmation?Uncollared Accelerated Share Repurchase This master confirmation

December 23, 2021 EX-99.1

Magnachip Announces New $75 Million Stock Repurchase Program - Magnachip initiates $37.5 Million Accelerated Stock Repurchase Agreement

Exhibit 99.1 Press Release Magnachip Announces New $75 Million Stock Repurchase Program - Magnachip initiates $37.5 Million Accelerated Stock Repurchase Agreement SEOUL, South Korea, December 21, 2021 ? Magnachip Semiconductor Corporation (?Magnachip Corp.? or the ?Company?) (NYSE: MX), announced today that the Board of Directors has authorized the Company to repurchase up to $75 million of the Co

December 23, 2021 8-K/A

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 21, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporat

December 21, 2021 EX-10.1

ASR Agreement dated December 21, 2021 by and between Magnachip Semiconductor Corporation and JPMorgan Chase Bank, National Association.

Exhibit 10.1 JPMorgan Chase Bank, National Association New York Branch 383 Madison Avenue New York, NY, 10179 December 21, 2021 To: Magnachip Semiconductor V-PLEX Bldg., 15th Fl. 501, Teheran-ro, Gangnam-gu Seoul, 06168, Republic of Korea Attention: Theodore S. Kim, Chief Compliance Officer and General Counsel Re: Master Confirmation?Uncollared Accelerated Share Repurchase This master confirmation

December 21, 2021 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 21, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporatio

December 21, 2021 EX-99.1

Magnachip Announces New $75 Million Stock Repurchase Program - Magnachip initiates $37.5 Million Accelerated Stock Repurchase Agreement

Exhibit 99.1 Press Release Magnachip Announces New $75 Million Stock Repurchase Program - Magnachip initiates $37.5 Million Accelerated Stock Repurchase Agreement SEOUL, South Korea, December 21, 2021 ? Magnachip Semiconductor Corporation (?Magnachip Corp.? or the ?Company?) (NYSE: MX), announced today that the Board of Directors has authorized the Company to repurchase up to $75 million of the Co

December 21, 2021 8-K

Termination of a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 20, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporatio

December 14, 2021 EX-3.1

Certificate of Designation of Series A-1 Junior Participating Preferred Stock of Magnachip Semiconductor Corporation, as filed with the Secretary of the State of Delaware on December 13, 2021.

Exhibit 3.1 CERTIFICATE OF DESIGNATION OF SERIES A-1 JUNIOR PARTICIPATING PREFERRED STOCK OF MAGNACHIP SEMICONDUCTOR CORPORATION Pursuant to Section 151 of the General Corporation Law of the State of Delaware Magnachip Semiconductor Corporation, a Delaware corporation (the ?Company?), pursuant to the provisions of Sections 103 of the General Corporation Law of the State of Delaware, does hereby ce

December 14, 2021 EX-10.1

Termination and Settlement Agreement, dated December 13, 2021 by and between Magnachip Semiconductor Corporation and South Dearborn Limited (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K on December 13, 2021)

Exhibit 10.1 EXECUTION VERSION TERMINATION AND SETTLEMENT AGREEMENT This Termination and Settlement Agreement (this ?Agreement?), dated as of December 13, 2021, is entered into by and among South Dearborn Limited, an exempted company incorporated in the Cayman Islands with limited liability (?Parent?), Michigan Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of Parent (?Merg

December 14, 2021 8-K

Regulation FD Disclosure, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Material Modification to Rights of Security Holders, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 13, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporatio

December 14, 2021 EX-4.1

Rights Agreement, dated as of December 13, 2021, between the Company and American Stock Transfer & Trust Company, LLC, which includes as Exhibits thereto the Form of Certificate of Designation, the Form of Right Certificate and the Summary of Terms attached thereto as Exhibits A, B and C, respectively.

Exhibit 4.1 RIGHTS AGREEMENT dated as of December 13, 2021 between MAGNACHIP SEMICONDUCTOR CORPORATION and AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC as Rights Agent TABLE OF CONTENTS Page SECTION 1. Definitions 1 SECTION 2. Appointment of Rights Agent 8 SECTION 3. Issuance of Right Certificates 8 SECTION 4. Form of Right Certificates 10 SECTION 5. Countersignature and Registration 10 SECTION 6.

December 14, 2021 EX-99.1

Magnachip and Wise Road Capital Announce Withdrawal of CFIUS Filing and Mutual Termination of Merger Agreement

Exhibit 99.1 Press Release Magnachip and Wise Road Capital Announce Withdrawal of CFIUS Filing and Mutual Termination of Merger Agreement - Magnachip adopts limited-duration shareholder rights plan SEOUL, South Korea, December 13, 2021 ? Magnachip Semiconductor Corporation (?Magnachip Corp.? or the ?Company?) (NYSE: MX), the U.S. (Delaware) parent of Magnachip Semiconductor, Ltd., and South Dearbo

December 14, 2021 EX-4.1

Rights Agreement, dated as of December 13, 2021, by and between Magnachip Semiconductor Corporation and American Stock Transfer & Trust Company, LLC, as Rights Agent, which includes as Exhibits thereto the Form of Certificate of Designation, the Form of Right Certificate and the Summary of Terms attached thereto as Exhibits A, B and C, respectively.

Exhibit 4.1 RIGHTS AGREEMENT dated as of December 13, 2021 between MAGNACHIP SEMICONDUCTOR CORPORATION and AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC as Rights Agent TABLE OF CONTENTS Page SECTION 1. Definitions 1 SECTION 2. Appointment of Rights Agent 8 SECTION 3. Issuance of Right Certificates 8 SECTION 4. Form of Right Certificates 10 SECTION 5. Countersignature and Registration 10 SECTION 6.

December 14, 2021 EX-3.1

Certificate of Designation of Series A-1, Junior Participating Preferred Stock of Magnachip Semiconductor Corporation, as filed with the Secretary of State of Delaware on December 13, 2021.

Exhibit 3.1 CERTIFICATE OF DESIGNATION OF SERIES A-1 JUNIOR PARTICIPATING PREFERRED STOCK OF MAGNACHIP SEMICONDUCTOR CORPORATION Pursuant to Section 151 of the General Corporation Law of the State of Delaware Magnachip Semiconductor Corporation, a Delaware corporation (the ?Company?), pursuant to the provisions of Sections 103 of the General Corporation Law of the State of Delaware, does hereby ce

December 14, 2021 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES Pursuant to Section 12(b) or (g) of the Securities Exchange Act of 1934 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES Pursuant to Section 12(b) or (g) of the Securities Exchange Act of 1934 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 83-0406195 (State or incorporation or organization) (I.R.S. Employer Identification No.) c/o Magn

November 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ☐ TRANSITION REPORT PURSU

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34

October 29, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 28, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation

October 25, 2021 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of U.S. dollars, except share data) (Unaudited) Three Months Ended Nine Months Ended September 30, 2021 June 30, 2021 September 30, 2020 Septembe

Exhibit 99.1 Magnachip Reports Results for Third Quarter 2021 ? Third quarter revenue of $127.0 million was up 11.5% sequentially and up 1.8% year-over-year (YoY). ? Gross profit margin for the third quarter was 36.7%, up 690 bps sequentially and up 1,380 bps YoY. ? GAAP net income was $10.8 million or $0.23 per diluted share. ? Non-GAAP net income was $20.1 million or $0.42 per diluted share. SEO

October 25, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 25, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

October 8, 2021 SC 13G/A

MX / Magnachip Semiconductor Corp / FEDERATED HERMES, INC. Passive Investment

OMB APPROVAL OMB Number: 3235-0145 Estimated average burden hours per response ?.11 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1*) MAGNACHIP SEMICONDUCTOR CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 55933J203 (CUSIP Number) September 30, 2021 (Date of Event Which Requires

September 27, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 25, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporati

September 14, 2021 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 13, 2021 MAGNACHIP SEMI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 13, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporati

August 30, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 27, 2021 MAGNACHIP SEMICON

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 27, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation)

August 30, 2021 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 27, 2021 MAGNACHIP SEMICON

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 27, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation)

August 23, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 23, 2021 MAGNACHIP SEMICON

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 23, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation)

August 23, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 23, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation)

August 23, 2021 EX-2.1

Letter Agreement, dated as of August 23, 2021, by and among Magnachip Semiconductor Corporation, South Dearborn Limited and Michigan Merger Sub, Inc. (incorporated by reference to Exhibit 2.1 to our Current Report on Form 8-K filed on August 23, 2021)

Exhibit 2.1 EXECUTION VERSION LETTER AGREEMENT August 23, 2021 VIA EMAIL Magnachip Semiconductor Corporation c/o Magnachip Semiconductor, Ltd. VPLEX Bldg., 15F 501 Teheran-ro, Gangnam-gu Seoul 06168, Republic of Korea Attention: Theodore S. Kim, General Counsel Email: [email protected] cc: Paul, Weiss, Rifkind, Wharton & Garrison LLP 1285 Avenue of the Americas New York, New York 10019-60

August 18, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 18, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation)

August 18, 2021 EX-99.1

Post Second Quarter 2021 Earnings Release Questions & Answers

Exhibit 99.1 Post Second Quarter 2021 Earnings Release Questions & Answers The following materials have been distributed to Magnachip?s investor relations team for purposes of responding to investor-related inquiries. Q. Please explain the reason for the decline in the revenue of Magnachip?s Display business during the second quarter. What is Magnachip?s overall supply plan for both the Display bu

August 6, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ☐ TRANSITION REPORT PURSUANT T

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34791 M

August 5, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 5, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

August 5, 2021 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of U.S. dollars, except share data) Three Months Ended Six Months Ended June 30, 2021 March 31, 2021 June 30, 2020 June 30, 2021 June 30, 2020 Re

Exhibit 99.1 Magnachip Reports Results for Second Quarter 2021 ? Second quarter revenue of $113.9 million was down 7.4% sequentially and down 4.2% year-over-year (YoY). ? Gross profit margin for the second quarter was 29.8%, up 190 bps sequentially and up 280 bps YoY. ? GAAP net loss was $(0.2) million or $(0.00) per diluted share. ? Non-GAAP net income was $7.0 million or $0.15 per diluted share.

July 29, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 26, 2021 MAGNACHIP SEMICONDU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 26, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

July 29, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 26, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

July 9, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 9, 2021 MAGNACHIP SEMICONDUC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 9, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (C

July 9, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 9, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (C

July 1, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 30, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

July 1, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 30, 2021 MAGNACHIP SEMICONDU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 30, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

June 17, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 16, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

June 17, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 16, 2021 MAGNACHIP SEMICONDU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 16, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

June 17, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (RULE 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (RULE 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

June 16, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 15, 2021 MAGNACHIP SEMICONDU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 15, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

June 16, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 15, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

June 14, 2021 EX-2.1

Letter Agreement, dated as of June 11, 2021, by and among Magnachip Semiconductor Corporation, South Dearborn Limited and Michigan Merger Sub, Inc. (incorporated by reference to Exhibit 2.1 to our Current Report on Form 8-K filed on June 14, 2021).

Exhibit 2.1 EXECUTION VERSION LETTER AGREEMENT June 11, 2021 VIA EMAIL Magnachip Semiconductor Corporation c/o Magnachip Semiconductor, Ltd. VPLEX Bldg., 15F 501 Teheran-ro, Gangnam-gu Seoul 06168, Republic of Korea Attention: Theodore S. Kim, General Counsel Email: [email protected] cc: Paul, Weiss, Rifkind, Wharton & Garrison LLP 1285 Avenue of the Americas New York, New York 10019-6064

June 14, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 11, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

June 14, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 11, 2021 MAGNACHIP SEMICONDU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 11, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (

June 14, 2021 EX-99.1

Magnachip Confirms Receipt of Unsolicited Proposal

Exhibit 99.1 Press Release Magnachip Confirms Receipt of Unsolicited Proposal SEOUL, South Korea, June 11, 2021 ? Magnachip Semiconductor Corporation (?Magnachip? or the ?Company?) (NYSE: MX), the South Korean leader in display and power solutions, today confirmed receipt of an unsolicited proposal from Cornucopia Investment Partners on behalf of itself and a group of investors, including financia

June 8, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 8, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (C

June 4, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (RULE 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (RULE 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy Statement ? Definitive Additional Materials ? Soliciting Material under ?240.

June 1, 2021 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jur

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD Specialized Disclosure Report Magnachip Semiconductor Corporation (Exact name of registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or other jurisdiction of incorporation or organization) (Commission File Number) (I.R.S. Employer Identification No.) c/o MagnaChip Semiconductor S.A. 1, All?e Sc

June 1, 2021 EX-1.01

Conflict Minerals Report of Magnachip Semiconductor Corporation for the reporting period from January 1, 2020 to December 31, 2020

Exhibit 1.01 Magnachip Semiconductor Corporation Conflict Minerals Report For the reporting period from January 1, 2020 to December 31, 2020 This Conflict Minerals Report (this ?Report?) of Magnachip Semiconductor Corporation (including its consolidated subsidiaries, the ?Company?) has been prepared pursuant to Rule 13p-1 and Form SD promulgated under the Securities Exchange Act of 1934 for the re

May 28, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 26, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (C

May 28, 2021 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 26, 2021 MAGNACHIP SEMICONDUC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 26, 2021 MAGNACHIP SEMICONDUCTOR CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (C

May 24, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 7)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

May 19, 2021 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

May 10, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 10, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

May 10, 2021 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of U.S. dollars, except share data) Three Months Ended March 31, December 31, March 31, 2021 2020 2020 Revenues: Net sales – standard products bu

Exhibit 99.1 Magnachip Reports Results for First Quarter 2021 ? First quarter revenue of $123.0 million was down 13.9% sequentially and up 2.1% year-over-year (YoY). ? Gross profit margin for the first quarter was 27.9%, up 100 bps sequentially and up 370 bps YoY. ? GAAP diluted loss per share for the first quarter was $0.19. ? Non-GAAP diluted earnings per share was 0.22 cents. SEOUL, South Korea

May 10, 2021 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34791

May 7, 2021 DEFM14A

- DEFM14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

April 30, 2021 10-K/A

Annual Report - 10-K/A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K/A (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-3

April 23, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 19, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

April 19, 2021 PREM14A

- PREM14A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

April 5, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (RULE 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 29, 2021 EX-2.1

Agreement and Plan of Merger, dated as of March 25, 2021, by and among South Dearborn Limited, Michigan Merger Sub, Inc., and Magnachip Semiconductor Corporation (incorporated by reference to Exhibit 2.1 to our Current Report on Form 8-K filed on March 29, 2021).

Exhibit 2.1 EXECUTION COPY AGREEMENT AND PLAN OF MERGER by and among SOUTH DEARBORN LIMITED, MICHIGAN MERGER SUB, INC. and MAGNACHIP SEMICONDUCTOR CORPORATION Dated as of March 25, 2021 TABLE OF CONTENTS Page ARTICLE I THE MERGER 6 Section 1.1 The Merger 6 Section 1.2 Closing 6 Section 1.3 Effective Time 7 Section 1.4 Effects of the Merger 7 Section 1.5 Certificate of Incorporation 7 Section 1.6 B

March 29, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 25, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 29, 2021 EX-99.4

Magnachip Sale to Wise Road Capital – Q&A

Exhibit 99.4 Magnachip Sale to Wise Road Capital ? Q&A The following materials have been (or will be) distributed to Magnachip?s executive officers and other members of management for purposes of responding to employees, customers and vendors/partners. The materials have also been distributed to Magnachip?s investor relations team for purposes of responding to investor-related inquries. Transactio

March 29, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 25, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 29, 2021 EX-99.2

Magnachip Semiconductor, VPLEX 15F, 501 Teheran-ro, Gangnam-gu, Seoul, South Korea 06168

Exhibit 99.2 Customer Memo Date: 2021. 03. 29 To: All Customers From: Magnachip Semiconductor Corporation Title: Recent News I want to reach out to you in light of the recently announced news: we have entered into a definitive agreement with investment vehicles established by Wise Road Capital and certain of its limited partners (?Wise Road?), under which Wise Road will acquire all outstanding sha

March 29, 2021 EX-99.3

2

Exhibit 99.3 Memo to Suppliers, Vendors and Business Partners Date: 2021. 03. 29 To: Suppliers, Vendors and Business Partners From: Magnachip Semiconductor Corporation Title: Recent News I want to reach out to you in light of the recently announced news: we have entered into a definitive agreement with investment vehicles established by Wise Road Capital and certain of its limited partners (?Wise

March 29, 2021 EX-99.1

March 29, 2021

EX-99.1 Exhibit 99.1 March 29, 2021 Dear Colleagues, I want to reach out to you in light of the recently announced news: we have entered into a definitive agreement with investment vehicles established by Wise Road Capital and certain of its limited partners (“Wise Road”), under which Wise Road will acquire all outstanding shares of common stock of Magnachip Semiconductor Corporation, the parent o

March 26, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 26, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 26, 2021 EX-99.1

Magnachip Enters into Definitive Agreement with Wise Road Capital in a Take Private Transaction Valued at $1.4 Billion

EX-99.1 Exhibit 99.1 Press Release Magnachip Enters into Definitive Agreement with Wise Road Capital in a Take Private Transaction Valued at $1.4 Billion • Magnachip shareholders to receive $29.00 in cash per share • Represents a 54% premium to Magnachip’s unaffected closing price of $18.83 on March 2, 2021 and a 75% premium to the 3-month volume-weighted average share price SEOUL, South Korea, Ma

March 26, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 26, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

March 9, 2021 EX-21.1

Subsidiaries of the Registrant

Exhibit 21.1 SUBSIDIARIES OF MAGNACHIP SEMICONDUCTOR CORPORATION Subsidiary Jurisdiction of Incorporation MagnaChip Semiconductor S.A. Luxembourg MagnaChip Semiconductor B.V. The Netherlands Magnachip Semiconductor, Ltd. Korea MagnaChip Semiconductor SA Holdings LLC Delaware MagnaChip Semiconductor Limited Taiwan Magnachip Semiconductor Limited Hong Kong SAR Magnachip Semiconductor Inc. Japan Magn

March 9, 2021 10-K

Annual Report - 10-K

Table of Contents Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

February 17, 2021 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of U.S. dollars, except share data) (Unaudited) Three Months Ended Year Ended December 31, September 30, December 31, December 31, December 31, 2

EX-99.1 Exhibit 99.1 Magnachip Reports Results for Fourth Quarter and Year 2020 • Fourth quarter revenue of $142.9 million was up 14.5% sequentially and up 15.9% year-over-year (YoY). It surpassed the midpoint of October guidance by $10.9 million; Full-year revenue of $507.1 million decreased 2.6% YoY due mainly to the exit from the non-automotive LCD business. • Fourth quarter OLED DDIC revenue o

February 17, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 17, 2021 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

February 16, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* MAGNACHIP SEMICONDUCTOR CORP (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the rule pursuant to whi

February 16, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to de

February 16, 2021 SC 13G/A

(Page 1 of 7 Pages)

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* MagnaChip Semiconductor Corporation (Name of Issuer) Common stock, $0.01 par value per share (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2020 (Date of event which requires filing of this statement) Check the appropriate box to designate the

February 12, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. _____*) MAGNACHIP SEMICONDUCTOR CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) (CU

OMB APPROVAL OMB Number: 3235-0145 Estimated average burden hours per response ?.11 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. *) MAGNACHIP SEMICONDUCTOR CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2020 (Date of Event Which Requires F

February 12, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)*

mx13ga1.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) ¨ Rule 13d-1(b) ý Rule 13d-1(c) ¨ Rule 13d-1(d

February 8, 2021 SC 13G/A

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3 )* MagnaChip Semiconductor Corp (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whic

January 15, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock, $0.01 Par Value (Title of Class of Securities) (CUS

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock, $0.01 Par Value (Title of Class of Securities) 55933J203 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuan

January 6, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.

December 30, 2020 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 30, 2020 Magnachip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

December 30, 2020 EX-3.1

Certificate of Amendment to the Certificate of Incorporation of Magnachip Semiconductor Corporation (incorporated by reference to Exhibit 3.1 to our Current report on Form 8-K filed on December 30, 2020)

EX-3.1 Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE CERTIFICATE OF INCORPORATION OF MAGNACHIP SEMICONDUCTOR CORPORATION A Delaware Corporation MagnaChip Semiconductor Corporation, a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the “Corporation”), hereby certifies as follows: FIRST: That the Certificate of Incorporation of the Corpor

November 6, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34

October 29, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 29, 2020 MagnaChip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

October 29, 2020 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of US dollars, except share data) Three Months Ended Nine Months Ended September 30, June 30, September 30, September 30, September 30, 2020 2020

EX-99.1 Exhibit 99.1 PRESS RELEASE MagnaChip Reports Results for Third Quarter 2020 • Completed sale of the Foundry Services Group business and Fab 4 on September 1, 2020 • Cash balance as of September 30, 2020 was $542.1 million including approximately $350.6 million cash proceeds • Paid $227.4 million to fully redeem 6.625% 2021 Senior Notes on October 2, 2020, lowering the future interest expen

October 16, 2020 SC 13G

MX / MagnaChip Semiconductor Corp / Toronado Partners, LLC - SC 13G Passive Investment

mitk13g.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.)* MagnaChip Semiconductor Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 55933J203 (CUSIP Number) October 6, 2020 (Date of Event Which Requires Filing of this Statement) ¨ Rule 13d-1(b) ý Rule 13d-1(c) ¨ Rule 13d-1(d) *T

September 8, 2020 EX-99.2

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES UNAUDITED PRO FORMA CONSOLIDATED FINANCIAL INFORMATION

Exhibit 99.2 MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES UNAUDITED PRO FORMA CONSOLIDATED FINANCIAL INFORMATION Sale of Foundry Services Group and Fab 4 On September 1, 2020 (the “Closing Date”), MagnaChip Semiconductor S.A., a Luxembourg société anonyme (“LuxCo”), and MagnaChip Semiconductor, Ltd., a Korean limited liability company (“MSK”), wholly owned subsidiaries of MagnaChip Semicon

September 8, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 1, 2020 MagnaChip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

September 8, 2020 EX-99.1

MagnaChip Completes Sale of Foundry Services Group and Fab 4

EX-99.1 Exhibit 99.1 Press Release MagnaChip Completes Sale of Foundry Services Group and Fab 4 • Purchase Price of Approximately $350.6 Million in Cash • Use Part of Proceeds to Reduce Debt SEOUL, South Korea, September 1, 2020 — MagnaChip Semiconductor Corporation (“MagnaChip” or the “Company”) (NYSE: MX) today announced that certain of its wholly owned subsidiaries have completed the previously

August 7, 2020 EX-10.8

Executive Service Agreement, dated as of May 25, 2020, by and between Young Soo Woo, MagnaChip Semiconductor Corporation and MagnaChip Semiconductor, Ltd. (incorporated by reference to Exhibit 10.8 to our Quarterly Report on Form 10-Q filed on August 7, 2020)

EX-10.8 Exhibit 10.8 EXECUTIVE SERVICE AGREEMENT This Executive Service Agreement (this “Agreement”), entered into on May 25, 2020 (the “Effective Date”), is made by and between Young Soo Woo (the “Executive”), on the one hand, and MagnaChip Semiconductor Corporation, a Delaware corporation (“Parent”), and MagnaChip Semiconductor, Ltd., a wholly owned subsidiary of Parent (“MSK” and together with

August 7, 2020 EX-10.9

Executive Service Agreement, dated as of June 1, 2020, by and between Chan Ho Park, MagnaChip Semiconductor Corporation and MagnaChip Semiconductor, Ltd. (incorporated by reference to Exhibit 10.9 to our Quarterly Report on Form 10-Q filed on August 7, 2020)

EX-10.9 Exhibit 10.9 EXECUTIVE SERVICE AGREEMENT This Executive Service Agreement (this “Agreement”), entered into on June 1, 2020 (the “Effective Date”), is made by and between Chan Ho Park (the “Executive”), on the one hand, and MagnaChip Semiconductor Corporation, a Delaware corporation (“Parent”), and MagnaChip Semiconductor, Ltd., a wholly owned subsidiary of Parent (“MSK” and together with P

August 7, 2020 10-Q

Quarterly Report - 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission File Number: 001-34791 M

July 30, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 30, 2020 MagnaChip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

July 30, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 30, 2020 MagnaChip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

July 30, 2020 EX-99.1

MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS (In thousands of US dollars, except share data) Three Months Ended Six Months Ended June 30, 2020 March 31, 2020 June 30, 2019 June 30, 2020 June 30, 2019 Reve

EX-99.1 Exhibit 99.1 PRESS RELEASE MagnaChip Reports Results for Second Quarter 2020 • GAAP earnings per share of $0.34 from continuing operations • Non-GAAP diluted earnings per share from continuing operations of $0.13 • Cash of $192.8 million highest since IPO in March 2011; net operating cash flow of $36.0 million, which was the 5th straight quarter of positive operating cash flow • Revenue fr

July 30, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 30, 2020 MagnaChip Semiconductor Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34791 83-0406195 (State or Other Jurisdiction of Incorporation) (Commission File Number) (IRS Employer Identification No.

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