0001325702 2020-01-01 2020-12-31 0001325702 2020-06-30 0001325702 2021-04-26 iso4217:USD shares true FY 0001325702 c/o MagnaChip Semiconductor S.A. 1 10-K/A true 2020-12-31 --12-31 2020 false 001-34791 Magnachip Semiconductor Corporation DE 83-0406195 Allée Scheffer L-2520 LU 352 45-62-62 Common Stock MX NYSE No No Yes Yes Accelerated Filer false false true false 332177863.40 46333946 Explanatory Note Magnachip Semiconductor Corporation (“MagnaChip,” the “Company,” “we,” “us,” or “our”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment” or this “Report”) to amend the Annual Report on Form 10-K for the year ended December 31, 2020, originally filed with the Securities and Exchange Commission (the “SEC”) on March 9, 2021 (the “Original 10-K Filing”), solely for the purpose of presenting the information required by Part III of Form 10-K. Such information was previously omitted from the Original 10-K Filing in reliance on General Instruction G(3) to Form 10-K, which permits the information required by Part III of Form 10-K to be incorporated in the Form 10-K by reference to the definitive proxy statement for the 2021 Annual Meeting of Stockholders if such proxy statement is filed no later than 120 days after the fiscal year end. We are filing this Amendment to to present the information required by Part III of Form 10 K, as we will not file our definitive proxy statement within 120 days of the end of our fiscal year ended December 31, 2020. The reference on the cover of the Original 10-K Filing to the incorporation by reference to portions of our definitive proxy statement into Part III of the Original 10-K Filing is hereby deleted. In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Part III, Items 10 through 14 of the Original 10-K Filing are hereby amended and restated in their entirety. In addition, we are also including Exhibits 31.3 and 31.4 required by the filing of this Amendment and have consequently amended and restated Part IV, Item 15 of the Original 10-K Filing as set forth herein. Because this Amendment does not contain any financial statements nor does this Amendment contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications contained in Exhibits 31.3 and 31.4 have been omitted. Because no financial statements are contained in this Amendment, we are not including certifications pursuant to 18 U.S.C. 1350. This Amendment does not amend or otherwise update any other information in the Original 10-K Filing. Accordingly, this Amendment should be read in conjunction with the Original 10-K Filing and with our filings with the SEC subsequent to the Original 10-K Filing.