    <SEC-DOCUMENT>0001392972-21-000043-index.html : 20210402
    <SEC-HEADER>0001392972-21-000043.hdr.sgml : 20210402
    <ACCEPTANCE-DATETIME>20210402082148
    ACCESSION NUMBER:		0001392972-21-000043
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		6
    FILED AS OF DATE:		20210402
    DATE AS OF CHANGE:		20210402

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			PROS Holdings, Inc.
    		CENTRAL INDEX KEY:			0001392972
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING SERVICES [7371]
    		IRS NUMBER:				760168604
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-33554
    		FILM NUMBER:		21800550

    	BUSINESS ADDRESS:
    		STREET 1:		3200 KIRBY DR.
    		STREET 2:		SUITE 600
    		CITY:			HOUSTON
    		STATE:			TX
    		ZIP:			77098
    		BUSINESS PHONE:		713-335-5151

    	MAIL ADDRESS:
    		STREET 1:		3200 KIRBY DR.
    		STREET 2:		SUITE 600
    		CITY:			HOUSTON
    		STATE:			TX
    		ZIP:			77098
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>defa14adefinitiveadditiona.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: defa14adefinitiveadditiona.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>finalpage1card1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: finalpage1card1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>finalpage1notice1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: finalpage1notice1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>finalpage2card1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: finalpage2card1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>finalpage2notice1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: finalpage2notice1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>image8a021.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: image8a021.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>