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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 to Commission File Number 001-14817 Delaware ( State or other jurisdiction of incorporation or organization ) PACCAR Inc ( Exact name of Registrant as specified in its charter ) 777 - 106th Ave. N.E. , Bellevue , WA ( Address of principal executive offices ) Title of Each Class Common Stock , $ 1 par value Large accelerated filer Non - accelerated filer 91-0351110 ( I.R.S. Employer Identification No. ) 98004 ( Zip Code ) Registrant's telephone number , including area code ( 425 ) 468-7400 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) PCAR Name of Each Exchange on Which Registered The Nasdaq Stock Market No No 区 Securities registered pursuant to Section 12 ( g ) of the Act : NONE 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 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 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 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 Exchange Act ) . The aggregate market value of the voting stock held by non - affiliates of the registrant as of June 30 , 2020 : Common Stock , $ 1 par value – $ 25.44 billion The number of shares outstanding of the registrant's classes of common stock , as of January 31 , 2021 : Common Stock , $ 1 par value – 346,936,820 shares Yes ☐ No 区 0 0 0 DOCUMENTS INCORPORATED BY REFERENCE Portions of the proxy statement for the annual stockholders meeting to be held on April 27 , 2021 are incorporated by reference into Part III .