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Table of Contents 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 Delaware P.A.M. TRANSPORTATION SERVICES , INC . ( Exact name of registrant as specified in its charter ) ( State or other jurisdiction of incorporation or organization ) 0-1507 ( Commission File Number ) 71-0633135 ( I.R.S. Employer Identification No. ) 297 West Henri De Tonti Blvd , Tontitown , Arkansas 72770 ( Address of principal executive offices ) ( Zip Code ) Registrant's telephone number , including area code : ( 479 ) 361-9111 N / A ( Former name , former address and former fiscal year , if changed since last report ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Trading Symbol ( s ) Common Stock , $ .01 par value PTSI Name of each exchange on which registered NASDAQ Global Market 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 □ No ☑ 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 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 ☑ 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 . Large accelerated filer Non - accelerated filer Accelerated filer Smaller reporting company ☑ Emerging growth company ☐