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( Mark One ) / X / 1 1 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 31 , 2020 or Transition report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 For the transition period from Delaware ( State or other jurisdiction of incorporation or organization ) Title of each class Common stock , par value $ 0.01 Commission File Number : 0-25092 # Large accelerated filer Smaller reporting company Insight INSIGHT ENTERPRISES , INC . ( Exact name of registrant as specified in its charter ) 6820 South Harl Avenue , Tempe , Arizona 85283 ( Address of principal executive offices , Zip Code ) Registrant's telephone number , including area code : ( 480 ) 333-3000 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol NSIT Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes X No to Securities registered pursuant to Section 12 ( g ) of the Act : n / a ( Title of Class ) X Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . No Yes X 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 X 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 X 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 Emerging growth company 86-0766246 ( IRS Employer Identification No. ) Name of each exchange on which registered The NASDAQ Global Select Market No 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 . // Non - accelerated filer 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 . / X / Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes DOCUMENTS INCORPORATED BY REFERENCE X The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant , based upon the closing price of the registrant's common stock as reported on The Nasdaq Global Select Market on June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , was $ 1,692,113,608 . The number of shares outstanding of the registrant's common stock on February 12 , 2021 was 35,103,074 . Portions of the registrant's Proxy Statement relating to its 2021 Annual Meeting of Stockholders have been incorporated by reference into Part III , Items 10 , 11 , 12 , 13 and 14 of this Annual Report on Form 10 - K .