    <SEC-DOCUMENT>0000934549-18-000067-index.html : 20180604
    <SEC-HEADER>0000934549-18-000067.hdr.sgml : 20180604
    <ACCEPTANCE-DATETIME>20180604145357
    ACCESSION NUMBER:		0000934549-18-000067
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		10
    FILED AS OF DATE:		20180604
    DATE AS OF CHANGE:		20180604
    EFFECTIVENESS DATE:		20180604

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ACACIA RESEARCH CORP
    		CENTRAL INDEX KEY:			0000934549
    		STANDARD INDUSTRIAL CLASSIFICATION:	PATENT OWNERS & LESSORS [6794]
    		IRS NUMBER:				954405754
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-37721
    		FILM NUMBER:		18877802

    	BUSINESS ADDRESS:
    		STREET 1:		520 NEWPORT CENTER DRIVE
    		STREET 2:		12TH FLOOR
    		CITY:			NEWPORT BEACH
    		STATE:			CA
    		ZIP:			92660
    		BUSINESS PHONE:		9494808300

    	MAIL ADDRESS:
    		STREET 1:		520 NEWPORT CENTER DRIVE
    		STREET 2:		12TH FLOOR
    		CITY:			NEWPORT BEACH
    		STATE:			CA
    		ZIP:			92660
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>stockholder_letter4.htm
    <DESCRIPTION>STOCKHOLDER_LETTER#4
    <TEXT>
    Document 1 - file: stockholder_letter4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-1
    <SEQUENCE>2
    <FILENAME>finalactgfightletter4.htm
    <DESCRIPTION>LETTER#4
    <TEXT>
    Document 2 - file: finalactgfightletter4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>finalactgfightletter4001.jpg
    <TEXT>
    Document 3 - file: finalactgfightletter4001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>finalactgfightletter4002.jpg
    <TEXT>
    Document 4 - file: finalactgfightletter4002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>finalactgfightletter4003.jpg
    <TEXT>
    Document 5 - file: finalactgfightletter4003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>finalactgfightletter4004.jpg
    <TEXT>
    Document 6 - file: finalactgfightletter4004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>finalactgfightletter4005.jpg
    <TEXT>
    Document 7 - file: finalactgfightletter4005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>finalactgfightletter4006.jpg
    <TEXT>
    Document 8 - file: finalactgfightletter4006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>finalactgfightletter4007.jpg
    <TEXT>
    Document 9 - file: finalactgfightletter4007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>finalactgfightletter4008.jpg
    <TEXT>
    Document 10 - file: finalactgfightletter4008.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>