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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 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number : 1-13738 PSYCHEMEDICS CORPORATION Delaware ( Exact Name of Registrant as Specified in Its Charter ) ( State or Other Jurisdiction of 58-1701987 ( I.R.S. Employer Identification No. ) Incorporation or Organization ) 289 Great Road Acton , Massachusetts ( Address of Principal Executive Offices ) Registrant's Telephone Number Including Area Code : ( 978 ) 206-8220 Securities registered pursuant to Section 12 ( b ) of the Act : 01720 ( Zip Code ) Title of Class Common stock . $ 0.005 par value Trading Symbol ( s ) . PMD Name of each exchange on which registered The Nasdaq Stock Market , LLC . Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by a check mark if the registrant is a well - known seasoned issuer ( as defined in Rule 405 of the Securities Exchange Act of 1934 ) . Yes □ No ☑ Indicate by a check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Securities Exchange Act of 1934 ) . 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 and posted 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 and post such files . ) Yes No □