    <SEC-DOCUMENT>0001104659-21-038340-index.html : 20210318
    <SEC-HEADER>0001104659-21-038340.hdr.sgml : 20210318
    <ACCEPTANCE-DATETIME>20210318160432
    ACCESSION NUMBER:		0001104659-21-038340
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		5
    FILED AS OF DATE:		20210318
    DATE AS OF CHANGE:		20210318

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Information Services Group Inc.
    		CENTRAL INDEX KEY:			0001371489
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MANAGEMENT CONSULTING SERVICES [8742]
    		IRS NUMBER:				205261587
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33287
    		FILM NUMBER:		21754358

    	BUSINESS ADDRESS:
    		STREET 1:		2187 ATLANTIC STREET
    		CITY:			STAMFORD
    		STATE:			CT
    		ZIP:			06902
    		BUSINESS PHONE:		203-517-3100

    	MAIL ADDRESS:
    		STREET 1:		2187 ATLANTIC STREET
    		CITY:			STAMFORD
    		STATE:			CT
    		ZIP:			06902
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>tm212411d2_defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: tm212411d2_defa14a.htm

    </DOCUMENT>
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    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>tm212411d2_defa14aimg001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: tm212411d2_defa14aimg001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm212411d2_defa14aimg002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm212411d2_defa14aimg002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tm212411d2_defa14aimg003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tm212411d2_defa14aimg003.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>tm212411d2_defa14aimg004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: tm212411d2_defa14aimg004.jpg

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    </SEC-DOCUMENT>