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Table of Contents ( Mark One ) 0 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 ( State of Incorporation ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10 - K Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Shares of Common Stock , $ 0.001 par value Commission File Number 001-33287 Information Services Group , Inc. ( Exact name of registrant as specified in its charter ) 2187 Atlantic Street Stamford , CT 06902 ( Address of principal executive offices and zip code ) Registrant's telephone number , including area code : ( 203 ) 517-3100 Trading Symbol III 20-5261587 ( I.R.S. Employer Identification Number ) Name of each exchange on which registered The Nasdaq Stock Market LLC 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 If an emerging growth company , indicate by check mark if the registrant has elected not standards provided pursuant to Section 13 ( a ) of the Exchange Act . 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 Accelerated filer Non - accelerated filer Smaller reporting company Emerging growth company use the extended transition period for complying with any new or revised financial accounting 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 Exchange Act ) . Yes No The aggregate market value of the voting common stock , par value $ 0.001 per share , held by non - affiliates of the registrant computed by reference to the closing sales price for the registrant's common stock on June 30 , 2020 , as reported on the Nasdaq Stock Market was approximately $ 85,143,871 . In determining the market value of the voting stock held by any non - affiliates , shares of common stock of the registrant beneficially owned by directors , officers and other holders of non - publicly traded shares of common stock of the registrant have been excluded . This determination of affiliate status is not necessarily a conclusive determination for other purposes . As of March 3 , 2021 , the registrant had outstanding 48,400,641 shares of common stock , par value $ 0.001 per share . Documents Incorporated by Reference Document Description Portions of the Proxy Statement for the 2021 Annual Meeting of Stockholders ( the " Proxy Statement " ) , to be filed within 120 days of the III ( Items 10 , 11 , 12 , 13 , 14 ) end of the fiscal year ended December 31 , 2020 , are incorporated by reference in Part III hereof . Except with respect to information specifically incorporated by reference in this Form 10 - K , the Proxy Statement is not deemed to be filed as part hereof . 10 - K Part