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Table of Contents Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Commission File Number 001-34791 Delaware ( State or Other Jurisdiction of Incorporation or Organization ) For the fiscal year ended December 31 , 2020 or Magnachip Magnachip Semiconductor Corporation ( Exact name of registrant as specified in its charter ) Title each class Common Stock , par value $ 0.01 per share to oo o c / o MagnaChip Semiconductor S.A. 1 , Allée Scheffer , L - 2520 Luxembourg , Grand Duchy of Luxembourg ( Address of principal executive offices ) ( Zip Code ) Registrant's telephone number , including area code : ( 352 ) 45-62-62 Securities registered pursuant to Section 12 ( b ) of the Act : 83-0406195 ( I.R.S. Employer Identification No. ) Trading Symbol MX Securities registered pursuant to Section 12 ( g ) of the Act : None Name of each exchange on which registered New York Stock Exchange Yes No Yes > No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Indicate by check mark whether the registrant has submitted electronically , every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files . Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large Accelerated Filer Non - Accelerated Filer Accelerated Filer Smaller Reporting Company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . | □ Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No State the aggregate market value of the voting and non - voting common equity held by non - affiliates computed by reference to the price at which the common equity was last sold , or the average bid and asked price of such common equity , as of the last business day of the registrant's most recently completed second fiscal quarter . $ 332,177,863.40 . As of February 26 , 2021 , the registrant had 46,130,726 shares of common stock outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's definitive proxy statement relating to its 2021 annual meeting of stockholders will be incorporated by reference into Part III of this Annual Report on Form 10 - K or included by amendment to this report within 120 days after the end of the fiscal year to which this report relates .