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Table of Contents Title of Each Class Common Stock , par value $ 0.01 per share UNITED STATES SECURITIES AND EXCHANGE COMMISSION Delaware ( State or other jurisdiction of incorporation or organization ) WASHINGTON , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Williams Industrial Services Group Inc. ( Exact name of registrant as specified in its charter ) Large accelerated filer Non - accelerated filer For the fiscal year ended December 31 , 2020 Commission File No. 001-16501 TT WILLIAMS 100 Crescent Centre Parkway , Suite 1240 Tucker , GA 30084 ( Address of registrant's principal executive offices and zip code ) Registrant's telephone number , including area code : ( 770 ) 879-4400 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) WLMS 73-1541378 ( I.R.S. Employer Identification No. ) Name of Each Exchange on Which Registered NYSE American Securities registered pursuant to Section 12 ( g ) of the Act : None . No 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 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 : 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 Act ) . Yes No As of June 26 , 2020 , the last business day of our most recently completed second fiscal quarter , the aggregate market value of the registrant's common stock held by non - affiliates was approximately $ 22,869,113 ( based upon the closing price on June 26 , 2020 of $ 1.32 per share ) . As of March 18 , 2021 , there were 25,583,715 shares of common stock of Williams Industrial Services Group Inc. outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's Proxy Statement for the 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of the Form 10 - K to the extent stated herein . The Proxy Statement or an amended report on Form 10 - K will be filed within 120 days of the registrant's year ended December 31 , 2020 .