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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D. C. 20549 FORM 10 - K ( Mark One ) 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 to Delaware ( State or other jurisdiction of incorporation or organization ) 730 Milford Road Merrimack , New Hampshire ( Address of principal executive offices ) Title of each class Common Stock Commission File Number 000-23827 PC CONNECTION , INC . ( Exact name of registrant as specified in its charter ) Registrant's telephone number , including area code ( 603 ) 683-2000 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol ( s ) CNXN Class Common Stock , $ .01 par value 02-0513618 Securities registered pursuant to Section 12 ( g ) of the Act : None ( Title of Class ) 03054 ( Zip Code ) Name of each exchange on which registered Nasdaq Global Select Market Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes □ 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 □ 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 þ No □ No þ No þ 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 þ 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 definitions of " large accelerated filer , " " accelerated filer , " " 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 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 þ The aggregate market value of the registrant's voting shares of common stock held by non - affiliates of the registrant on June 30 , 2020 , based on $ 46.36 per share , the last reported sale price on the Nasdaq Global Select Market on that date , was $ 507 million . The number of shares outstanding of each of the registrant's classes of common stock , as of March 12 , 2021 : Number of Shares 26,174,844 The following documents are incorporated by reference into the Annual Report on Form 10 - K : Portions of the registrant's definitive Proxy Statement for its 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Report .