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( Mark One ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 26 , 2020 Or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Commission file number : 000-50307 Delaware ( State or other jurisdiction of incorporation or organization ) FormFactor , Inc. ( Exact name of registrant as specified in its charter ) 7005 Southfront Road , Livermore , California 94551 ( Address of principal executive offices , including zip code ) ( 925 ) 290-4000 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common stock , $ 0.001 par value to Trading Symbol ( s ) FORM 13-3711155 ( I.R.S. Employer Identification No. ) Name of each exchange on which registered Nasdaq Global Market Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No 区 Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No | 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 submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of the 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 , a 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 : Accelerated filer Non - accelerated filer Large 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 prepares or issued its audit report . 因 Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes □ No 区 Aggregate market value of registrant's common stock held by non - affiliates of the registrant , based upon the closing price of a share of the registrant's common stock on June 26 , 2020 ( the last business day of the registrant's most recently completed second quarter ) as reported by Nasdaq Global Market on that date : $ 1,046.0 million . The number of shares of the registrant's common stock , par value $ 0.001 per share , outstanding as of February 16 , 2021 was 77,749,914 shares . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's definitive Proxy Statement for the 2021 Annual Meeting of Stockholders , which will be filed within 120 days of the end of the registrant's fiscal year ended December 26 , 2020 , are incorporated by reference in Part III hereof . Except with respect to information specifically incorporated by reference in this Annual Report on Form 10 - K , the Proxy Statement is not deemed to be filed as a part of this Annual Report on Form 10 - K .