☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION For the quarterly period ended March 31, 2021 Table of Contents Washington, D.C. 20549 FORM 10-Q or ☐ Transition Report Pursuant to the Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from __________to__________ | P.A.M. TRANSPORTATION SERVICES, INC. | | --- | (Exact name of registrant as specified in its charter) (State or other juri ...

Table of Contents ☒ 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________ P.A.M. TRANSPORTATION SERVICES, INC. (Exact name of registrant as specified in its charter) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (State or other jurisdiction of incorporation ...