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Table of Contents Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTIONS 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 ( MARK ONE ) X 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 Commission file number 001-06462 MASSACHUSETTS ( State or Other Jurisdiction of Incorporation or Organization ) TERADYNE , INC . ( Exact Name of Registrant as Specified in Its Charter ) 600 RIVERPARK DRIVE NORTH READING , MASSACHUSETTS ( Address of Principal Executive Offices ) 04-2272148 ( I.R.S. Employer Identification Number ) 01864 ( Zip Code ) Registrant's telephone number , including area code : ( 978 ) 370-2700 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) TER Name of each exchange on which registered Nasdaq Stock Market LLC Yes 区 No □ Title of each class No 区 Common Stock , par value $ 0.125 per share 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 Exchange Act . Yes 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 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 , or a smaller reporting company . See the definitions of " large accelerated filer , " " accelerated filer " and " smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act ( check one ) : Large accelerated filer Accelerated filer Non - 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 . Yes > No No 区 Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes The aggregate market value of the voting stock held by non - affiliates of the registrant as of June 26 , 2020 was approximately $ 10.6 billion based upon the closing price of the registrant's Common Stock on the Nasdaq Stock Market on that date . The number of shares outstanding of the registrant's only class of Common Stock as of February 16 , 2021 was 166,694,772 shares . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's proxy statement in connection with its 2021 annual meeting of shareholders are incorporated by reference into Part III of this Form 10 - K .