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<PAGE>
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 ______________

                                    FORM 8-K
                                  _____________

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                                FEBRUARY 10, 2005
                DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED)

                                  ____________

                           ACACIA RESEARCH CORPORATION
             (Exact name of Registrant as specified in its Charter)


         Delaware                      000-26068                 95-4405754
         --------                      ---------                 ----------
(State or Other Jurisdiction          (Commission             (I.R.S. Employer
       of Incorporation)              File Number)           Identification No.)


                            500 Newport Center Drive,
                         Newport Beach, California 92660
                    (Address of Principal Executive Offices)


                                 (949) 480-8300
               Registrant's telephone number, including area code


                                 Not Applicable
          (Former Name or Former Address, if Changed since Last Report)



<PAGE>


ITEM 7.01. Regulation FD Disclosure


            On February 10, 2005, Acacia Research Corporation issued a press
release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated
herein by reference.






<PAGE>




                                   SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned, hereunto duly authorized.


                                    ACACIA RESEARCH CORPORATION


Date: February 14, 2005             By: /S/ PAUL R. RYAN
                                    --------------------------------------------
                                    Name:  Paul R. Ryan
                                    Title: Chairman and Chief Executive Officer







                                       -2-

<PAGE>




                                  EXHIBIT INDEX




EXHIBIT NUMBER         DESCRIPTION
--------------         -----------


99.1                   Press Release dated February 10, 2005, of the Registrant.





</TEXT>
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<FILENAME>acacia_8kex99-1.txt
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<PAGE>

                                                                    EXHIBIT 99.1

                                                       Contacts:  Robert Stewart
                                                              Investor Relations
                                                             Tel. (949) 480-8300
                                                             Fax. (949) 480-8301

FOR RELEASE
February 10, 2005


               ACACIA TECHNOLOGIES GROUP TO RECEIVE $19.6 MILLION
                 FROM ACACIA RESEARCH REGISTERED DIRECT OFFERING


         Newport Beach, Calif. - (BUSINESS WIRE) -February 10, 2005 - Acacia
Research Corporation (Nasdaq: ACTG:CBMX) announced today that it has obtained
commitments to purchase $19.6 million of its Acacia Research-Acacia Technologies
common stock in a registered direct offering. Under the terms of the
transaction, Acacia will sell 3.5 million shares of its Acacia Research-Acacia
Technologies common stock at $5.60 per share to a select group of institutional
investors including investor funds and accounts affiliated with Apex Capital,
LLC. The closing of the offering is expected to take place on February 10, 2005,
subject to the satisfaction of customary closing conditions. All of the shares
of Acacia Research-Acacia Technologies common stock are being offered by Acacia
pursuant to an effective registration statement previously filed with the
Securities and Exchange Commission.

         This press release shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any state or jurisdiction in which such offer, solicitation or sale would be
unlawful prior to registration or qualification under the securities laws of any
such state or jurisdiction. The shares of common stock may only be offered by
means of a prospectus. Copies of the prospectus supplement and accompanying base
prospectus are on file with the Securities & Exchange Commission.

ABOUT ACACIA RESEARCH CORPORATION

Acacia Research Corporation comprises two operating groups, Acacia Technologies
group and CombiMatrix group.

The Acacia Technologies group develops, acquires, and licenses patented
technologies. Acacia controls 29 patent portfolios, which include 126 U.S.
patents, and certain foreign counterparts, covering technologies used in a wide
variety of industries including audio/video-on-demand, digital ad insertion,
interactive television, broadcast equipment, data transmission, cache coherency,
data file synchronization, data matrix bar codes, dynamic manufacturing models,
product activation, encryption, image resolution and enhancement, dynamic
manufacturing models, scheduling software, interstitial Internet advertising,
interactive simulation systems, peer to peer network communications, spreadsheet
programs, endoscopic cameras, video noise reduction, and audio/video
synchronization.

<PAGE>

The CombiMatrix group is developing a platform technology to rapidly produce
customizable active biochips, which are semiconductor-based tools for use in
identifying and determining the roles of genes, gene mutations and proteins.
CombiMatrix's technology has a wide range of applications including DNA
synthesis/diagnostics, drug discovery, and immunochemical detection.
CombiMatrix's Express Track(sm) drug discovery program is a systems biology
approach, using its technology, to target common viral diseases with siRNA
compounds.

Acacia Research-Acacia Technologies (Nasdaq: ACTG) and Acacia
Research-CombiMatrix (Nasdaq: CBMX) are both classes of common stock issued by
Acacia Research Corporation and are intended to reflect the performance of the
respective operating groups and are not issued by the operating groups.

INFORMATION ABOUT THE ACACIA TECHNOLOGIES GROUP AND THE COMBIMATRIX GROUP IS
AVAILABLE AT www.acaciaresearch.com.
             ----------------------

SAFE HARBOR STATEMENT UNDER THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

THIS NEWS RELEASE CONTAINS FORWARD-LOOKING STATEMENTS WITHIN THE MEANING OF THE
"SAFE HARBOR" PROVISIONS OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF
1995. THESE STATEMENTS ARE BASED UPON OUR CURRENT EXPECTATIONS AND SPEAK ONLY AS
OF THE DATE HEREOF. OUR ACTUAL RESULTS MAY DIFFER MATERIALLY AND ADVERSELY FROM
THOSE EXPRESSED IN ANY FORWARD-LOOKING STATEMENTS AS A RESULT OF VARIOUS FACTORS
AND UNCERTAINTIES, INCLUDING THE RECENT ECONOMIC SLOWDOWN AFFECTING TECHNOLOGY
COMPANIES, OUR ABILITY TO SUCCESSFULLY DEVELOP PRODUCTS, RAPID TECHNOLOGICAL
CHANGE IN OUR MARKETS, CHANGES IN DEMAND FOR OUR FUTURE PRODUCTS, LEGISLATIVE,
REGULATORY AND COMPETITIVE DEVELOPMENTS AND GENERAL ECONOMIC CONDITIONS. OUR
ANNUAL REPORT ON FORM 10-K, RECENT AND FORTHCOMING QUARTERLY REPORTS ON FORM
10-Q, RECENT CURRENT REPORTS ON FORMS 8-K AND 8-K/A, AND OTHER SEC FILINGS
DISCUSS SOME OF THE IMPORTANT RISK FACTORS THAT MAY AFFECT OUR BUSINESS, RESULTS
OF OPERATIONS AND FINANCIAL CONDITION. WE UNDERTAKE NO OBLIGATION TO REVISE OR
UPDATE PUBLICLY ANY FORWARD-LOOKING STATEMENTS FOR ANY REASON.

</TEXT>
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