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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 ) THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) THE SECURITIES EXCHANGE ACT OF 1934 Commission file number : 001-08443 Maryland ( State or other jurisdiction of incorporation or organization ) 19886 Ashburn Road , Ashburn , Virginia ( Address of principal executive offices ) TELOS CORPORATION ( Exact name of registrant as specified in its charter ) Title of each class Common stock , $ 0.001 par value per share Large accelerated filer Non - accelerated filer Registrant's telephone number , including area code : ( 703 ) 724-3800 Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol TLS 52-0880974 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( g ) of the Act : None 20147-2358 ( Zip Code ) 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 Name of each exchange on which registered The Nasdaq Stock Market LLC 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 DOCUMENTS INCORPORATED BY REFERENCE : 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 . 1 No 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 . □ No " No | Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes □ The aggregate market value of the registrant's common stock held by non - affiliates of the registrant as of June 30 , 2020 : Not applicable As of March 15 , 2021 , the registrant had outstanding 64,625,071 shares of common stock . Certain of the information required in Part III of this Form 10 - K is incorporated by reference to the Registrant's definitive proxy statement to be filed for the Annual Meeting of Stockholders to be held on May 25 , 2021 .