Acacia Research 10K 2009 Annual report

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

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

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2009

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

FOR THE TRANSITION PERIOD FROM TO .

Commission File Number 0-26068

ACACIA RESEARCH CORPORATION

(Exact name of registrant as specified in its charter)

DELAWARE	95-4405754
(State or other jurisdiction of	(I.R.S. Employer
incorporation organization)	Identification No.)

500 NEWPORT CENTER DRIVE, NEWPORT BEACH, CA	92660
(Address of principal executive offices)	(Zip Code)

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

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Name of Each Exchange on Which Registered
Common Stock, $0.001 par value	The NASDAQ Stock Market, LLC

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ¨ No þ

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 þ

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 filing requirements for the past 90 days. Yes þ No £

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 229.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes o No o

Indicate by check mark that disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ¨		Accelerated filer þ
Non-accelerated filer ¨ (Do not check if a smaller reporting company)		Smaller reporting company ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ¨ No þ

The aggregate market value of the registrant’s common stock held by non-affiliates of the registrant, computed by reference to the last sale price of such stock reported on The NASDAQ Global Market, as of June 30, 2009, was approximately $236,617,000. (All executive officers and directors of the registrant are considered affiliates.)

As of February 23, 2010, 33,148,984 shares of common stock were issued and outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement for its Annual Meeting of Stockholders to be filed with the Commission within 120 days after the close of its fiscal year are incorporated by reference into Part III.

ACACIA RESEARCH CORPORATION

FORM 10-K ANNUAL REPORT

FISCAL YEAR ENDED DECEMBER 31, 2009

TABLE OF CONTENTS

Item		Page
PART I

1.	Business	1
1A.	Risk Factors	7
1B.	Unresolved Staff Comments	17
2.	Properties	17
3.	Legal Proceedings	17
4.	Submission of Matters to a Vote of Security Holders	17


PART II

5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	18
6.	Selected Financial Data	21
7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	23
7A.	Quantitative and Qualitative Disclosures About Market Risk	37
8.	Financial Statements and Supplementary Data	38
9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	38
9A.	Controls and Procedures	38
9B.	Other Information	38


PART III

10.	Directors, Executive Officers and Corporate Governance	39
11.	Executive Compensation	39
12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	39
13.	Certain Relationships and Related Transactions, and Director Independence	39
14.	Principal Accounting Fees and Services	39


PART IV

15.	Exhibits, Financial Statement Schedules	40

PART I

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

As used in this Annual Report on Form 10-K, “we,” “us” and “our” refer to Acacia Research Corporation and/or its wholly and majority-owned operating subsidiaries. All intellectual property acquisition, development, licensing and enforcement activities are conducted solely by certain of our wholly owned operating subsidiaries.

This report contains forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. Reference is made in particular to the description of our plans and objectives for future operations, assumptions underlying such plans and objectives, and other forward-looking statements included in this report. Such statements may be identified by the use of forward-looking terminology such as “may,” “will,” “expect,” “believe,” “estimate,” “anticipate,” “intend,” “continue,” or similar terms, variations of such terms or the negative of such terms. Such statements are based on management’s current expectations and are subject to a number of factors and uncertainties, which could cause actual results to differ materially from those described in the forward-looking statements. Such statements address future events and conditions concerning product development, capital expenditures, earnings, litigation, regulatory matters, markets for products and services, liquidity and capital resources and accounting matters. Actual results in each case could differ materially from those anticipated in such statements by reason of factors such as future economic conditions, changes in consumer demand, legislative, regulatory and competitive developments in markets in which we and our subsidiaries operate, and other circumstances affecting anticipated revenues and costs, as more fully disclosed in our discussion of risk factors incorporated by reference in Item 1A. of Part I of this report. We expressly disclaim any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in our expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based. Additional factors that could cause such results to differ materially from those described in the forward-looking statements are set forth in connection with the forward-looking statements.

Item 1. BUSINESS

General

We are a leader in licensing patented technologies and have established a proven track record of licensing success with over 740 license agreements executed to date, across 60 of our technology license programs. Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 140 patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

CombiMatrix Group Split-Off Transaction and Related Discontinued Operations. In January 2006, our board of directors approved a plan for our former wholly owned subsidiary, CombiMatrix Corporation, or CombiMatrix, the primary component of our life science business, known as the CombiMatrix group, to become an independent publicly-held company. On August 15, 2007, or the Redemption Date, CombiMatrix was split-off from us through the redemption of all outstanding shares of Acacia Research-CombiMatrix common stock in exchange for the distribution of new shares of CombiMatrix common stock, on a pro-rata basis, to the holders of Acacia Research-CombiMatrix common stock on the Redemption Date. We refer to this transaction as the Split-Off Transaction. Subsequent to the Redemption Date, we no longer own any equity interests in CombiMatrix and the CombiMatrix group is no longer one of our business groups. Subsequent to the Split-Off Transaction, our only business is our intellectual property licensing business.

Refer to Note 11 to our consolidated financial statements, included elsewhere herein, for information regarding presentation of the assets, liabilities, results of operations and cash flows for the CombiMatrix group as “Discontinued Operations,” for all periods presented, in accordance with guidance set forth in Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC, Topic 205-20 “Discontinued Operations,” or ASC Topic 205-20.

Capital Structure. Pursuant to the terms of the Split-Off Transaction, all outstanding shares of Acacia Research-CombiMatrix common stock were redeemed, and all rights of holders of Acacia Research-CombiMatrix common stock ceased as of the Redemption Date, except for the right, upon the surrender to the exchange agent of shares of Acacia Research-CombiMatrix common stock, to receive new shares of CombiMatrix common stock. As a result of, and immediately following, the consummation of the Split-Off Transaction, our only class of common stock outstanding was our Acacia Research-Acacia Technologies common stock.

On May 20, 2008, our stockholders approved an amendment and restatement of our Certificate of Incorporation to eliminate all references to Acacia Research-CombiMatrix common stock and all provisions relating to the rights and obligations of the Acacia Research-CombiMatrix common stock. In addition, the amendment and restatement changed the name of the “Acacia Research-Acacia Technologies common stock” to “common stock,” and our common stock is the only class of common stock authorized and issuable.

Other

We were originally incorporated in California in January 1993 and reincorporated in Delaware in December 1999. Our website address is www.acaciaresearch.com. We make our filings with the Securities and Exchange Commission, or the SEC, including our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports, available free of charge on our website as soon as reasonably practicable after we file these reports. In addition, we post the following information on our website:

our corporate code of conduct, our code of conduct for our board of directors and our fraud policy; and

charters for our audit committee, nominating and corporate governance committee, disclosure committee and compensation committee.

The public may read and copy any materials that we file with the SEC at the SEC’s Public Reference Room at 100 F Street, NE, Washington, D.C. 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. Also, the SEC maintains an Internet website that contains reports, proxy and information statements, and other information regarding issuers, including us, that file electronically with the SEC. The public can obtain any documents that we file with the SEC at http://www.sec.gov.

BUSINESS OVERVIEW

Intellectual Property Licensing Business

Our operating subsidiaries acquire, develop, license and enforce patented technologies. Our operating subsidiaries generate license fee revenues and related cash flows from the granting of licenses for the use of patented technologies that our operating subsidiaries own or control. Our operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, if necessary, with the enforcement against unauthorized users of their patented technologies. Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 140 patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries. Refer to “Patented Technologies” below for a partial summary of patent portfolios owned or controlled by certain of our operating subsidiaries.

We are a leader in patent licensing and our operating subsidiaries have established a proven track record of licensing success with more than 740 license agreements executed to date. To date, on a consolidated basis, we have generated revenues from 60 of our technology licensing and enforcement programs. Our professional staff includes in-house patent attorneys, licensing executives, engineers and business development executives.

Our partners are primarily individual inventors and small companies who have limited resources and/or expertise to effectively address the unauthorized use of their patented technologies, and also include large companies seeking to effectively and efficiently monetize their portfolio of patented technologies. In a typical partnering arrangement, our operating subsidiary will acquire a patent portfolio, or acquire rights to a patent portfolio, with our partner receiving an upfront payment for the purchase of the patent portfolio or patent portfolio rights, or receiving a percentage of our operating subsidiaries net recoveries from the licensing and enforcement of the patent portfolio, or a combination of the two.

Under U.S. law, an inventor or patent owner has the right to exclude others from making, selling or using their patented invention. Unfortunately, in the majority of cases, infringers are generally unwilling, at least initially, to negotiate or pay reasonable royalties for their unauthorized use of third-party patents and will typically fight any allegations of patent infringement. Inventors and/or patent holders without sufficient financial or expert technical resources to bring legal action may lack credibility in dealing with unwilling licensees and as a result, are often blatantly ignored.

As a result of the common reluctance of patent infringers to negotiate and ultimately take a patent license for the use of third-party patented technologies without at least the threat of legal action, patent licensing and enforcement often begins with the filing of patent enforcement litigation. However, the majority of patent infringement contentions settle out of court, based on the strength of the patent claims, validity, and persuasive evidence and clarity that the patent is being infringed.

We execute patent licensing arrangements with users of our patented technologies through willing licensing negotiations without the filing of patent infringement litigation, or through the negotiation of license and settlement arrangements in connection with the filing of patent infringement litigation.

Business Model and Strategy

Overview

The business model associated with the licensing and enforcement activities conducted by our operating subsidiaries is summarized in the following illustration:

Key Elements of Business Strategy

Our intellectual property acquisition, development, licensing and enforcement business strategy, conducted solely by our operating subsidiaries, includes the following key elements:

Identify Emerging Growth Areas where Patented Technologies will Play a Vital Role

The patent process breeds, encourages and sustains innovation and invention by granting a limited monopoly to the inventor in exchange for sharing the invention with the public. Certain technologies, including several of the technologies controlled by our operating subsidiaries, some of which are summarized below, become core technologies in the way products and services are manufactured, sold and delivered by companies across a wide array of industries. Our operating subsidiaries identify core, patented technologies that have been or are anticipated to be widely adopted by third parties in connection with the manufacture or sale of products and services.

Contact and Form Alliances with Owners of Core, Patented Technologies

Often individual inventors and small companies have limited resources and/or expertise and are unable to effectively address the unauthorized use of their patented technologies. Individual inventors and small companies may lack sufficient capital resources and may also lack in-house personnel with patent licensing expertise and/or experience, which may make it difficult to effectively out-license and/or enforce their patented technologies.

For years, many large companies have earned substantial revenue licensing patented technologies to third parties. Other companies that do not have internal licensing resources and expertise may have continued to record the capitalized carrying value of their core and or non-essential intellectual property in their financial statements, without deriving income from their intellectual property or realizing the potential value of their intellectual property assets. Securities and financial reporting regulations require these companies to periodically evaluate and potentially reduce or write-off these intellectual property assets if they are unable to substantiate these reported carrying values.

Our operating subsidiaries seek to enter into business agreements with owners of intellectual property that do not have experience or expertise in the areas of intellectual property licensing and enforcement or that do not possess the in-house resources to devote to intellectual property licensing and enforcement activities or that, for any number of strategic business reasons, desire to more efficiently and effectively outsource their intellectual property licensing and enforcement activities.

Effectively and Efficiently Evaluate Patented Technologies for Acquisition, Licensing and Enforcement

Subtleties in the language of a patent, recorded interactions with the patent office, and the evaluation of prior art and literature can make a significant difference in the potential licensing and enforcement revenue derived from a patent or patent portfolio. Our specialists are trained and skilled in these areas. It is important to identify potential problem areas, if any, and determine whether potential problem areas can be overcome, prior to acquiring a patent portfolio or launching an effective licensing program. We have developed processes and procedures for identifying problem areas and evaluating the strength of a patent portfolio before the decision is made to allocate resources to an acquisition or an effective licensing and enforcement effort.

Patent Portfolio Evaluation. The processes and procedures employed in connection with the evaluation of a specific patent portfolio for acquisition, licensing and enforcement are tailored and unique to each specific situation, and can vary widely, based on the specific facts and circumstances of a specific patent portfolio, technology, related industry and other factors. Some of the key components of our processes and procedures may include:

Utilizing our staff of in-house intellectual property business development executives, patent attorneys, intellectual property licensing executives, and technology engineers to conduct our tailored patent acquisition and evaluation processes and procedures. We may also leverage the expertise of external specialists and technology consultants.

Identifying emerging growth areas where patented technologies will play a vital role in connection with the manufacture or sale of products and services.

Identifying core, patented technologies that have been or are anticipated to be widely adopted by third parties in connection with the manufacture or sale of products and services.

Considering the impact of subtleties in the language of a patent, recorded interactions with the patent office, evaluating prior art and literature and considering the impact on the potential licensing and enforcement revenue that can be derived from a patent or patent portfolio.

Evaluating the strength of a patent portfolio, including consideration of the types of claims and the number of claims potentially infringed by third parties, before the decision is made to allocate resources to an acquisition or an effective licensing and enforcement effort.

Identifying and considering potential problem areas, if any, and determining whether potential problem areas can be overcome prior to acquiring a patent portfolio or launching an effective licensing program.

Identifying potential infringers, industries within which the potential infringers exist, longevity of the patented technology, and a variety of other factors that directly impact the magnitude and potential success of a licensing and enforcement program.

Purchase or Acquire the Rights to Patented Technologies

After evaluation, our operating subsidiaries may elect to purchase the patented technology, or acquire the exclusive right to license the patented technology in all or in specific fields of use. In either case, the owner of the patent generally retains the rights to a portion of the net revenues generated from a patent portfolio’s licensing and enforcement program. Our operating subsidiaries generally control the licensing and enforcement process and utilize experienced in-house personnel to reduce outside costs and to ensure that the necessary capital and expertise is allocated and deployed in an efficient and cost effective manner.

Successfully License and Enforce Patents with Significant Royalty Potential

As part of the patent evaluation process employed by our operating subsidiaries, significant consideration is also given to the identification of potential infringers, industries within which the potential infringers exist, longevity of the patented technology, and a variety of other factors that directly impact the magnitude and potential success of a licensing and enforcement program. Our specialists are trained in evaluating potentially infringing technologies and in presenting the claims of our patents and demonstrating how they apply to companies we believe are using our technologies in their products or services. These presentations can take place in a non-adversarial business setting, but can also occur through the litigation process, if necessary. Ultimately, we execute patent licensing arrangements with users of our patented technologies through willing licensing negotiations without the filing of patent infringement litigation, or through the negotiation of license and settlement arrangements in connection with the filing of patent infringement litigation.

Patented Technologies

Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 140 patent portfolios, with patent expiration dates ranging from 2010 to 2029, and covering technologies used in a wide variety of industries, including the following:

·	Aligned Wafer Bonding	·	Enterprise Content Management	·	Optical Switching
·	Audio Communications Fraud Detection	·	Facilities Operation Management System	·	Parallel Processing with Shared Memory
·	Audio Storage and Retrieval System	·	File Locking in Shared Storage Networks	·	Peer to Peer Communications
·	Audio Video Enhancement & Synchronization	·	Flash Memory	·	Physical Access Control
·	Authorized Spending Accounts	·	Fluid Flow Control and Monitoring	·	Picture Archiving & Communication Systems
·	Automated Notification of Tax Return Status	·	Hearing Aid ECS	·	Pointing Device
·	Automated Tax Reporting	·	Heated Surgical Blades	·	Pop-Up Internet Advertising
·	Biosensor	·	High Performance Computer Architecture	·	Portable Credit Card Processing
·	Broadcast Data Retrieval	·	High Quality Image Processing	·	Portable Storage Devices with Links
·	Child-friendly Secure Mobile Phones	·	High Resolution Optics	·	Product Activation
·	Chip-Stacking	·	Image Resolution Enhancement	·	Projector
·	Color Correction for Video Graphics Systems	·	Improved Anti-Trap Safety Technology for Vehicles	·	Purifying Nucleic Acids
·	Compact Disk	·	Improved Commercial Print	·	Radio Communication with Graphics
·	Compiler	·	Improved Lighting	·	Records Management
·	Computer Architecture and Power Management	·	Improved Memory Manufacturing	·	Relational Database Access
·	Computer Graphics	·	Improved Printing	·	Remote Management of Imaging Devices
·	Computer Memory Cache Coherency	·	Information Portal Software	·	Remote Video Camera
·	Computer Simulations	·	Integrated Access	·	Resource Scheduling
·	Consumer Rewards	·	Interactive Content in a Cable Distribution System	·	Rule Based Monitoring
·	Continuous TV Viewer Measuring	·	Interactive Mapping	·	Shape Memory Alloys
·	Copy Protection	·	Internet Radio Advertising	·	Software Installation
·	Credit Card Fraud Protection	·	Interstitial Internet Advertising	·	Software License Management
·	Data Encryption	·	Intraluminal Device Technology	·	Spreadsheet Automation
·	Database Access	·	Laparoscopic Surgery	·	Storage Technology
·	Database Management	·	Laptop Connectivity	·	Surgical Catheter
·	Database Retrieval	·	Lighting Ballast	·	Telematics
·	Digital Newspaper Delivery	·	Location Based Services	·	Television Data Display
·	Digital Signal Processing Architecture	·	Manufacturing Data Transfer	·	Television Signal Scrambling
·	Digital Video Enhancement	·	Medical Image Manipulation	·	Text Auto-Completion
·	Digital Video Production	·	Medical Image Stabilization	·	User Programmable Engine Control
·	Distributed Data Management and Synchronization	·	Medical Monitoring	·	Vehicle Anti-Theft Parking Systems
·	DMT®	·	MEMS	·	Vehicle Maintenance
·	Document Generation	·	Messaging	·	Vehicle Occupant Sensing
·	Document Retrieval Using Global Word Co-Occurrence Patterns	·	Micromirror Digital Display	·	Videoconferencing
·	Dynamic Manufacturing Modeling	·	Microprocessor Enhancement	·	Virtual Computer Workspaces
·	Ecommerce Pricing	·	Microprocessor Memory Management	·	Virtual Server
·	Electronic Address List Management	·	Mobile Computer Synchronization	·	Website Crawling
·	Electronic Message Advertising	·	Multi-Dimensional Database Compression	·	Wireless Data
·	Electronic Securities Trading	·	Network Monitoring	·	Wireless Digital Messaging
·	Embedded Broadcast Data	·	Network Remote Access	·	Wireless LAN
·	Encrypted Media & Playback Devices	·	Online Ad Tracking	·	Workspace with Moving Viewpoint
·	Enhanced DRAM Architecture	·	Online Auction Guarantees
·	Enhanced Internet Navigation	·	Online Promotion

Patent Enforcement Litigation

Our operating subsidiaries are often required to engage in litigation to enforce their patents and patent rights. Certain of our operating subsidiaries are parties to ongoing patent enforcement related litigation, alleging infringement by third parties of certain of the patented technologies owned or controlled by our operating subsidiaries.

Competition

We expect to encounter increased competition in the area of patent acquisitions and enforcement. This includes an increase in the number of competitors seeking to acquire the same or similar patents and technologies that we may seek to acquire. Entities including Allied Security Trust, Altitude Capital Partners, Coller IP, Intellectual Ventures, Millennium Partners, Open Innovation Network, RPX Corporation and Rembrandt IP Management compete in acquiring rights to patents, and we expect more entities to enter the market.

We also compete with venture capital firms, strategic corporate buyers and various industry leaders for technology acquisitions and licensing opportunities. Many of these competitors may have more financial and human resources than our operating subsidiaries. As we become more successful, we may find more companies entering the market for similar technology opportunities, which may reduce our market share in one or more technology industries that we currently rely upon to generate future revenue.

Other companies may develop competing technologies that offer better or less expensive alternatives to our patented technologies that we may acquire and/or out-license. Many potential competitors may have significantly greater resources than the resources that our operating subsidiaries possess. Technological advances or entirely different approaches developed by one or more of our competitors could render certain of the technologies owned or controlled by our operating subsidiaries obsolete and/or uneconomical.

Employees

As of December 31, 2009, on a consolidated basis, we had 44 full-time employees. Neither we nor any of our subsidiaries are a party to any collective bargaining agreement. We consider our employee relations to be good.

Item 1A. RISK FACTORS

An investment in our common stock involves a high degree risk. Before making a decision to invest in shares of our common stock, you should carefully consider the following risk factors, as well as the other information contained in this annual report. If any of the following risks actually occur, our business, financial condition, results of operations and prospectus could be materially adversely affected. If this were to occur, the trading price of our common stock could decline significantly and you may lose all or part of your investment in our common stock. All intellectual property acquisition, development, licensing and enforcement activities are conducted solely by certain of our wholly and majority-owned operating subsidiaries.

RISKS RELATED TO OUR BUSINESS

WE HAVE A HISTORY OF LOSSES AND WILL PROBABLY INCUR ADDITIONAL LOSSES IN THE FUTURE.

We have sustained substantial losses since our inception. We may never become profitable, or if we do, we may never be able to sustain profitability. As of December 31, 2009, our accumulated deficit was $120.2 million. As of December 31, 2009, we had approximately $53.9 million in cash and cash equivalents along with investments and working capital of $36.0 million. We expect to incur significant legal, marketing, general and administrative expenses. As a result, it is more likely than not that we will incur losses for the foreseeable future. However, we believe our current cash and investments on hand will be sufficient to finance anticipated capital and operating requirements for at least the next twelve months.

IF WE, OR OUR SUBSIDIARIES, ENCOUNTER UNFORESEEN DIFFICULTIES AND CANNOT OBTAIN ADDITIONAL FUNDING ON FAVORABLE TERMS, OUR BUSINESS MAY SUFFER.

Our consolidated cash and cash equivalents along with investments totaled $53.9 million and $51.5 million at December 31, 2009 and 2008, respectively. To date, we have relied primarily upon selling of equity securities and payments from our licensees to generate the funds needed to finance our operations and the operations of our operating subsidiaries.

We may encounter unforeseen difficulties in the future, including the outside influences identified below, that may deplete our capital resources more rapidly than anticipated. As a result, we and or our subsidiary companies may be required to obtain additional financing in the future through bank borrowings, debt or equity financings or otherwise. If we are required to raise additional capital in the future, such additional financing may not be available on favorable terms, or at all, or may be dilutive to our existing stockholders. If we fail to obtain additional capital as and when needed for our subsidiary companies and ourselves, such failure could have a material adverse impact on our business plans and business.

FAILURE TO EFFECTIVELY MANAGE OUR GROWTH COULD PLACE STRAINS ON OUR MANAGERIAL, OPERATIONAL AND FINANCIAL RESOURCES AND COULD ADVERSELY AFFECT OUR BUSINESS AND OPERATING RESULTS.

Our growth has placed, and is expected to continue to place, a strain on our managerial, operational and financial resources and systems. Further, as our subsidiary companies’ businesses grow, we will be required to manage multiple relationships. Any further growth by us or our subsidiary companies or an increase in the number of our strategic relationships may place additional strain on our managerial, operational and financial resources and systems. Although we may not grow as we expect, if we fail to manage our growth effectively or to develop and expand our managerial, operational and financial resources and systems, our business and financial results will be materially harmed.

OUR FUTURE SUCCESS DEPENDS ON OUR ABILITY TO EXPAND OUR ORGANIZATION TO MATCH THE GROWTH OF OUR SUBSIDIARIES.

As our operating subsidiaries grow, the administrative demands upon us and our operating subsidiaries will grow, and our success will depend upon our ability to meet those demands. These demands include increased accounting, management, legal services, staff support, and general office services. We may need to hire additional qualified personnel to meet these demands, the cost and quality of which is dependent in part upon market factors outside of our control. Further, we will need to effectively manage the training and growth of our staff to maintain an efficient and effective workforce, and our failure to do so could adversely affect our business and operating results.

OUR REVENUES WILL BE UNPREDICTABLE, AND THIS MAY HARM OUR FINANCIAL CONDITION.

From January 2005 to present, certain of our operating subsidiaries have continued to execute our business strategy of acquiring patent portfolios and accompanying patent rights. Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 140 patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries. These acquisitions continue to expand and diversify our revenue generating opportunities. We believe that our cash and cash equivalent balances, anticipated cash flow from operations and other external sources of available credit, will be sufficient to meet our cash requirements through at least March 2011, and for the foreseeable future. However, due to the nature of our licensing business and uncertainties regarding the amount and timing of the receipt of license fees from potential infringers, stemming primarily from uncertainties regarding the outcome of enforcement actions, rates of adoption of our patented technologies, the growth rates of our existing licensees and other factors, our revenues may vary significantly from quarter to quarter, which could make our business difficult to manage, adversely affect our business and operating results, cause our quarterly results to be below market expectations and adversely affect the market price of our common stock.

OUR OPERATING SUBSIDIARIES DEPEND UPON RELATIONSHIPS WITH OTHERS TO PROVIDE TECHNOLOGY-BASED OPPORTUNITIES THAT CAN DEVELOP INTO PROFITABLE ROYALTY-BEARING LICENSES, AND IF THEY ARE UNABLE TO MAINTAIN AND GENERATE NEW RELATIONSHIPS, THEN THEY MAY NOT BE ABLE TO SUSTAIN EXISTING LEVELS OF REVENUE OR INCREASE REVENUE.

Neither we nor our operating subsidiaries invent new technologies or products but instead depend on the identification and acquisition of new patents and inventions through our relationships with inventors, universities, research institutions, and others. If our operating subsidiaries are unable to maintain those relationships and continue to grow new relationships, then they may not be able to identify new technology-based opportunities for growth and sustainable revenue.

Our current or future relationships may not provide the volume or quality of technologies necessary to sustain our business. In some cases, universities and other technology sources may compete against us as they seek to develop and commercialize technologies. Universities may receive financing for basic research in exchange for the exclusive right to commercialize resulting inventions. These and other strategies may reduce the number of technology sources and potential clients to whom we can market our services. If we are unable to maintain current relationships and sources of technology or to secure new relationships and sources of technology, such inability may have a material adverse effect on our operating results and financial condition.

THE SUCCESS OF OUR OPERATING SUBSIDIARIES DEPENDS IN PART UPON THEIR ABILITY TO RETAIN THE BEST LEGAL COUNSEL TO REPRESENT THEM IN PATENT ENFORCEMENT LITIGATION.

The success of our licensing business depends upon our operating subsidiaries’ ability to retain the best legal counsel to prosecute patent infringement litigation. As our operating subsidiaries’ patent enforcement actions increase, it will become more difficult to find the best legal counsel to handle all of our cases because many of the best law firms may have a conflict of interest that prevents their representation of our subsidiaries.

OUR OPERATING SUBSIDIARIES, IN CERTAIN CIRCUMSTANCES, RELY ON REPRESENTATIONS, WARRANTIES AND OPINIONS MADE BY THIRD PARTIES, THAT IF DETERMINED TO BE FALSE OR INACCURATE, MAY EXPOSE US AND OUR OPERATING SUBSIDIARIES TO CERTAIN MATERIAL LIABILITIES.

From time to time, our operating subsidiaries may rely upon representations and warranties made by third parties from whom our operating subsidiaries acquired patents or the exclusive rights to license and enforce patents. We also may rely upon the opinions of purported experts. In certain instances, we may not have the opportunity to independently investigate and verify the facts upon which such representations, warranties, and opinions are made. By relying on these representations, warranties and opinions, our operating subsidiaries may be exposed to liabilities in connection with the licensing and enforcement of certain patents and patent rights which could have a material adverse effect on our operating results and financial condition.

IN CONNECTION WITH PATENT ENFORCEMENT ACTIONS CONDUCTED BY CERTAIN OF OUR SUBSIDIARIES, A COURT MAY RULE THAT WE OR OUR SUBSIDIARIES HAVE VIOLATED CERTAIN STATUTORY, REGULATORY, FEDERAL, LOCAL OR GOVERNING RULES OR STANDARDS, WHICH MAY EXPOSE US AND OUR OPERATING SUBSIDIARIES TO CERTAIN MATERIAL LIABILITIES.

In connection with any of our patent enforcement actions, it is possible that a defendant may request and/or a court may rule that we have violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against us or our operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material, and if we or our operating subsidiaries are required to pay such monetary sanctions, attorneys’ fees and/or expenses, such payment could materially harm our operating results and our financial position.

OUR INVESTMENTS IN AUCTION RATE SECURITIES ARE SUBJECT TO RISKS, INCLUDING THE CONTINUED FAILURE OF FUTURE AUCTIONS, WHICH MAY CAUSE US TO INCUR LOSSES OR HAVE REDUCED LIQUIDITY.

At December 31, 2009, our investments in marketable securities included certain auction rate securities. Our auction rate securities are investment grade quality and were in compliance with our investment policy when purchased. Historically, our auction rate securities were recorded at cost, which approximated their fair market value due to their variable interest rates, which typically reset every 7 to 35 days, despite the long-term nature of their stated contractual maturities. The Dutch auction process that resets the applicable interest rate at predetermined calendar intervals is intended to provide liquidity to the holder of auction rate securities by matching buyers and sellers within a market context enabling the holder to gain immediate liquidity by selling such interests at par or rolling over their investment. If there is an imbalance between buyers and sellers the risk of a failed auction exists. Due to recent liquidity issues in the global credit and capital markets, these securities experienced several failed auctions since February 2008. In such case of a failure, the auction rate securities continue to pay interest, at the maximum rate, in accordance with their terms, however, we may not be able to access the par value of the invested funds until a future auction of these investments is successful, the security is called by the issuer or a buyer is found outside of the auction process.

At December 31, 2009, the par value of auction rate securities collateralized by student loan portfolios totaled $2.7 million. As a result of the liquidity issues associated with the failed auctions, we estimate that the fair value of these auction rate securities no longer approximates their par value. Due to the estimate that the market for these student loan collateralized instruments may take in excess of twelve months to fully recover, we have classified these investments as noncurrent in the accompanying December 31, 2009 consolidated balance sheet. In addition, as a result of our analysis of the estimated fair value of our student loan collateralized instruments, as described at Note 7 to the consolidated financial statements included elsewhere herein, we have recorded an other-than-temporary loss of $296,000 and $263,000 for our student loan collateralized instruments in the accompanying consolidated statements of operations for the years ended December 31, 2009 and 2008, respectively.

The capital and credit markets have been experiencing extreme volatility and disruption for more than 12 months, and at times, the volatility and disruption have reached unprecedented levels. In several cases, the markets have exerted downward pressure on stock prices and credit capacity for certain issuers. Given the deteriorating credit markets, and the sustained incidence of failure within the auction market since February 2008, we may be unable to liquidate a particular issue. Furthermore, if these market conditions were to persist despite our ability to hold such investments until maturity, we may be required to record additional impairment charges in a future period. The systemic failure of future auctions for auction rate securities may result in a loss of liquidity, substantial impairment to our investments, realization of substantial future losses, or a complete loss of the investment in the long-term which may have a material adverse effect on our business, results of operations, liquidity, and financial condition. Refer to Note 7 to our accompanying consolidated financial statements, included elsewhere herein, for additional information about our investments in auction rate securities.

RISKS RELATED TO OUR INDUSTRY

OUR EXPOSURE TO UNCONTROLLABLE OUTSIDE INFLUENCES, INCLUDING NEW LEGISLATION, COURT RULINGS OR ACTIONS BY THE UNITED STATES PATENT AND TRADEMARK OFFICE, COULD ADVERSELY AFFECT OUR LICENSING AND ENFORCEMENT BUSINESS AND RESULTS OF OPERATIONS.

Our licensing and enforcement business is subject to numerous risks from outside influences, including the following:

New legislation, regulations or rules related to obtaining patents or enforcing patents could significantly increase our operating costs and decrease our revenue.

Our operating subsidiaries acquire patents with enforcement opportunities and are spending a significant amount of resources to enforce those patents. If new legislation, regulations or rules are implemented either by Congress, the U.S. Patent and Trademark Office, or USPTO, or the courts that impact the patent application process, the patent enforcement process or the rights of patent holders, these changes could negatively affect our expenses and revenue. For example, new rules regarding the burden of proof in patent enforcement actions could significantly increase the cost of our enforcement actions, and new standards or limitations on liability for patent infringement could negatively impact our revenue derived from such enforcement actions.

Trial judges and juries often find it difficult to understand complex patent enforcement litigation, and as a result, we may need to appeal adverse decisions by lower courts in order to successfully enforce our patents.

It is difficult to predict the outcome of patent enforcement litigation at the trial level. It is often difficult for juries and trial judges to understand complex, patented technologies, and as a result, there is a higher rate of successful appeals in patent enforcement litigation than more standard business litigation. Such appeals are expensive and time consuming, resulting in increased costs and delayed revenue. Although we diligently pursue enforcement litigation, we cannot predict with significant reliability the decisions made by juries and trial courts.

More patent applications are filed each year resulting in longer delays in getting patents issued by the USPTO.

Certain of our operating subsidiaries hold and continue to acquire pending patents. We have identified a trend of increasing patent applications each year, which we believe is resulting in longer delays in obtaining approval of pending patent applications. The application delays could cause delays in recognizing revenue from these patents and could cause us to miss opportunities to license patents before other competing technologies are developed or introduced into the market. See the subheading “Competition is intense in the industries in which our subsidiaries do business and as a result, we may not be able to grow or maintain our market share for our technologies and patents,” below.

Federal courts are becoming more crowded, and as a result, patent enforcement litigation is taking longer.

Our patent enforcement actions are almost exclusively prosecuted in federal court. Federal trial courts that hear our patent enforcement actions also hear criminal cases. Criminal cases always take priority over our actions. As a result, it is difficult to predict the length of time it will take to complete an enforcement action. Moreover, we believe there is a trend in increasing numbers of civil lawsuits and criminal proceedings before federal judges, and as a result, we believe that the risk of delays in our patent enforcement actions will have a greater affect on our business in the future unless this trend changes.

Any reductions in the funding of the USPTO could have an adverse impact on the cost of processing pending patent applications and the value of those pending patent applications.

The assets of our operating subsidiaries consist of patent portfolios, including pending patent applications before the USPTO. The value of our patent portfolios is dependent upon the issuance of patents in a timely manner, and any reductions in the funding of the USPTO could negatively impact the value of our assets. Further, reductions in funding from Congress could result in higher patent application filing and maintenance fees charged by the USPTO, causing an unexpected increase in our expenses.

Competition is intense in the industries in which our subsidiaries do business and as a result, we may not be able to grow or maintain our market share for our technologies and patents.

We expect to encounter competition in the area of patent acquisition and enforcement as the number of companies entering this market is increasing. This includes competitors seeking to acquire the same or similar patents and technologies that we may seek to acquire. Entities including Allied Security Trust, Altitude Capital Partners, Coller IP, Intellectual Ventures, Millennium Partners, Open Innovation Network, RPX Corporation and Rembrandt IP Management compete in acquiring rights to patents, and we expect more entities to enter the market. As new technological advances occur, many of our patented technologies may become obsolete before they are completely monetized. If we are unable to replace obsolete technologies with more technologically advanced patented technologies, then this obsolescence could have a negative effect on our ability to generate future revenues.

Our licensing business also competes with venture capital firms and various industry leaders for technology licensing opportunities. Many of these competitors may have more financial and human resources than we do. As we become more successful, we may find more companies entering the market for similar technology opportunities, which may reduce our market share in one or more technology industries that we currently rely upon to generate future revenue.

Our patented technologies face uncertain market value.

Our operating subsidiaries have acquired patents and technologies that are at early stages of adoption in the commercial and consumer markets. Demand for some of these technologies is untested and is subject to fluctuation based upon the rate at which our licensees will adopt our patents and technologies in their products and services. Refer to the related risk factor below.

As patent enforcement litigation becomes more prevalent, it may become more difficult for us to voluntarily license our patents.

We believe that the more prevalent patent enforcement actions become, the more difficult it will be for us to voluntarily license our patents. As a result, we may need to increase the number of our patent enforcement actions to cause infringing companies to license the patent or pay damages for lost royalties. This may increase the risks associated with an investment in our company.

The foregoing outside influences may affect other risk factors described in this annual report.

Any one of the foregoing outside influences may cause our company to need additional financing to meet the challenges presented or to compensate for a loss in revenue, and we may not be able to obtain the needed financing. See the heading “If we, or our subsidiaries, encounter unforeseen difficulties and cannot obtain additional funding on favorable terms, our business may suffer” above.

THE MARKETS SERVED BY OUR OPERATING SUBSIDIARIES ARE SUBJECT TO RAPID TECHNOLOGICAL CHANGE, AND IF OUR OPERATING SUBSIDIARIES ARE UNABLE TO DEVELOP AND ACQUIRE NEW TECHNOLOGIES AND PATENTS, OUR ABILITY TO GENERATE REVENUES COULD BE SUBSTANTIALLY IMPAIRED.

The markets served by our operating subsidiaries’ licensees frequently undergo transitions in which products rapidly incorporate new features and performance standards on an industry-wide basis. Products for communications applications, high-speed computing applications, as well as other applications covered by our operating subsidiaries’ intellectual property, are based on continually evolving industry standards. Our ability to compete in the future will, however, depend on our ability to identify and ensure compliance with evolving industry standards. This will require our continued efforts and success in acquiring new patent portfolios with licensing and enforcement opportunities. While we expect for the foreseeable future to have sufficient liquidity and capital resources needed to maintain the level of acquisitions necessary to keep pace with these technological advances, outside influences may cause the need for greater liquidity and capital resources than expected, as described under the caption “Because our business operations are subject to many uncontrollable outside influences, we may not succeed” above. If we are unable to acquire new technologies and related patent portfolios, or to identify and ensure compliance with evolving industry standards, our ability to generate revenues could be substantially impaired and our business and financial condition could be materially harmed.

THE RECENT FINANCIAL CRISIS AND CURRENT UNCERTAINTY IN GLOBAL ECONOMIC CONDITIONS COULD NEGATIVELY AFFECT OUR BUSINESS, RESULTS OF OPERATIONS, AND FINANCIAL CONDITION

Our revenue-generating opportunities depend on the use of our patented technologies by existing and prospective licensees, the overall demand for the products and services of our licensees, and on the overall economic and financial health of our licensees. The recent financial crisis affecting the banking system and financial markets and the current uncertainty in global economic conditions have resulted in a tightening in the credit markets, a low level of liquidity in many financial markets, and extreme volatility in the credit, equity and fixed income markets. If the current worldwide economic downturn continues, many of our licensees’ customers, which may rely on credit financing, may delay or reduce their purchases of our licensees’ products and services. In addition, the use or adoption of our patented technologies is often based on current and forecasted demand for our licensees’ products and services in the marketplace and may require companies to make significant initial commitments of capital and other resources. If the negative conditions in the global credit markets delay or prevent our licensees’ and their customers’ access to credit, overall consumer spending on the products and services of our licensees may decrease and the adoption or use of our patented technologies may slow, respectively. Further, if the markets in which our licensees’ participate experience further economic downturns, as well as a slow recovery period, this could negatively impact our licensees’ long-term sales and revenue generation, margins and operating expenses, which could impact the magnitude of revenues generated or projected to be generated by our licensees, which could have a material impact on our business, license fee generating opportunities, operating results and financial condition.

In addition, we have significant patent-related intangible assets recorded on our consolidated balance sheet. We will continue to evaluate the recoverability of the carrying amount of our patent-related intangible assets on an ongoing basis, and we may incur substantial impairment charges, which would adversely affect our consolidated financial results. There can be no assurance that the outcome of such reviews in the future will not result in substantial impairment charges. Impairment assessment inherently involves judgment as to assumptions about expected future cash flows and the impact of market conditions on those assumptions. Future events and changing market conditions may impact our assumptions as to prices, costs, holding periods or other factors that may result in changes in our estimates of future cash flows. Although we believe the assumptions we used in testing for impairment are reasonable, significant changes in any one of our assumptions could produce a significantly different result.

RISKS RELATED TO OUR COMMON STOCK

THE AVAILABILITY OF SHARES FOR SALE IN THE FUTURE COULD REDUCE THE MARKET PRICE OF OUR COMMON STOCK.

In the future, we may issue securities to raise cash for operations and acquisitions. We may also pay for interests in additional subsidiary companies by using shares of our common stock or a combination of cash and shares of our common stock. We may also issue securities convertible into our common stock. Any of these events may dilute stockholders’ ownership interests in our company and have an adverse impact on the price of our common stock.

In addition, sales of a substantial amount of our common stock in the public market, or the perception that these sales may occur, could reduce the market price of our common stock. This could also impair our ability to raise additional capital through the sale of our securities.

DELAWARE LAW AND OUR CHARTER DOCUMENTS CONTAIN PROVISIONS THAT COULD DISCOURAGE OR PREVENT A POTENTIAL TAKEOVER OF OUR COMPANY THAT MIGHT OTHERWISE RESULT IN OUR STOCKHOLDERS RECEIVING A PREMIUM OVER THE MARKET PRICE OF THEIR SHARES.

Provisions of Delaware law and our certificate of incorporation and bylaws could make the acquisition of our company by means of a tender offer, proxy contest or otherwise, and the removal of incumbent officers and directors, more difficult. These provisions include:

Section 203 of the Delaware General Corporation Law, which prohibits a merger with a 15%-or-greater stockholder, such as a party that has completed a successful tender offer, until three years after that party became a 15%-or-greater stockholder;

amendment of our bylaws by the stockholders requires a two-thirds approval of the outstanding shares;

the authorization in our certificate of incorporation of undesignated preferred stock, which could be issued without stockholder approval in a manner designed to prevent or discourage a takeover;

provisions in our bylaws eliminating stockholders’ rights to call a special meeting of stockholders, which could make it more difficult for stockholders to wage a proxy contest for control of our board of directors or to vote to repeal any of the anti-takeover provisions contained in our certificate of incorporation and bylaws; and

the division of our board of directors into three classes with staggered terms for each class, which could make it more difficult for an outsider to gain control of our board of directors.

Together these provisions may make the removal of management more difficult and may discourage transactions that otherwise could involve payment of a premium over prevailing market prices for our common stock.

AS A RESULT OF THE REDEMPTION OF ACACIA RESEARCH-COMBIMATRIX COMMON STOCK FOR THE COMMON STOCK OF COMBIMATRIX CORPORATION, WE MAY BE SUBJECT TO CERTAIN TAX LIABILITY UNDER THE INTERNAL REVENUE CODE.

Our distribution of the common stock of CombiMatrix in the Split-Off Transaction will be tax-free to us if the distribution qualifies under Sections 368 and 355 of the Internal Revenue Code of 1986, as amended, or the Code. If the Split-Off Transaction fails to qualify under Section 355 of the Code, corporate tax would be payable by the consolidated group as of the date of the Split-Off Transaction, of which we are the common parent, based upon the difference between the aggregate fair market value of the assets of CombiMatrix’s business and the adjusted tax bases of such business to us prior to the redemption.

We received a private letter ruling from the Internal Revenue Service, or the IRS, to the effect that, among other things, the redemption would be tax free to us and the holders of Acacia Research-Acacia Technologies common stock and Acacia Research-CombiMatrix common stock under Sections 368 and 355 of the Code. The private letter ruling, while generally binding upon the IRS, was based upon factual representations and assumptions and commitments on our behalf with respect to future operations made in the ruling request. The IRS could modify or revoke the private letter ruling retroactively if the factual representations and assumptions in the request were materially incomplete or untrue, the facts upon which the private letter ruling was based were materially different from the facts at the time of the redemption, or if we do not comply with certain commitments made.

If the Split-Off Transaction fails to qualify under Section 355 of the Code, corporate tax, if any, would be payable by the consolidated group of which we are the common parent, as described above. As such, the corporate level tax would be payable by us. CombiMatrix has agreed however, to indemnify us for this and certain other tax liabilities if they result from actions taken by CombiMatrix. Notwithstanding CombiMatrix’s agreement to indemnify us, under the Code’s consolidated return regulations, each member of our consolidated group, including our company, will be severally liable for these tax liabilities. Further, we may be liable for additional taxes if we take certain actions within two years following the redemption, as more fully discussed in the immediately following risk factor. If we are found liable to the IRS for these liabilities, the resulting obligation could materially and adversely affect our financial condition, and we may be unable to recover on the indemnity from CombiMatrix.

FOLLOWING THE REDEMPTION OF ACACIA RESEARCH-COMBIMATRIX COMMON STOCK FOR THE COMMON STOCK OF COMBIMATRIX, WE MAY BE SUBJECT TO CERTAIN TAX LIABILITIES UNDER THE INTERNAL REVENUE CODE FOR ACTIONS TAKEN BY US OR COMBIMATRIX FOLLOWING THE REDEMPTION.

Even if the distribution qualifies under Section 368 and 355 of the Code, it will be taxable to us if Section 355(e) of the Code applies to the distribution. Section 355(e) will apply if 50% or more of our common stock or CombiMatrix’s common stock, by vote or value, is acquired by one or more persons, other than the holders of Acacia Research-CombiMatrix common stock who receive the common stock of CombiMatrix in the redemption, acting pursuant to a plan or a series of related transactions that includes the redemption. Any shares of our common stock, the Acacia Research-CombiMatrix stock or the common stock of CombiMatrix acquired directly or indirectly within two years before or after the redemption generally are presumed to be part of such a plan unless we can rebut that presumption. To prevent applicability of Section 355(e) or to otherwise prevent the distribution from failing to qualify under Section 355 of the Code, CombiMatrix has agreed that, until two years after the redemption, it will not take any of the following actions unless prior to taking such action, it has obtained, and provided to us, a written opinion of tax counsel or a ruling from the IRS to the effect that such action will not cause the redemption to be taxable to us, which we refer to in this report collectively as Disqualifying Actions:

merge or consolidate with another corporation;

liquidate or partially liquidate;

sell or transfer all or substantially all of its assets;

redeem or repurchase its stock (except in certain limited circumstances); or

take any other action which could reasonably be expected to cause Section 355(e) to apply to the distribution.

Further, if we take any Disqualifying Action, we may be subject to additional tax liability. Many of our competitors are not subject to similar restrictions and may issue their stock to complete acquisitions, expand their product offerings and speed the development of new technology. Therefore, these competitors may have a competitive advantage over us. Substantial uncertainty exists on the scope of Section 355(e), and we may have undertaken, may contemplate undertaking or may otherwise undertake in the future transactions which may cause Section 355(e) to apply to the redemption notwithstanding our desire or intent to avoid application of Section 355(e). Accordingly, we cannot provide you any assurance that we will not be liable for taxes if Section 355(e) applies to the redemption.

WE MAY FAIL TO MEET MARKET EXPECTATIONS BECAUSE OF FLUCTUATIONS IN QUARTERLY OPERATING RESULTS, WHICH COULD CAUSE THE PRICE OF OUR COMMON STOCK TO DECLINE.

Our reported revenues and operating results have fluctuated in the past and may continue to fluctuate significantly from quarter to quarter in the future. It is possible that in future periods, revenues could fall below the expectations of securities analysts or investors, which could cause the market price of our common stock to decline. The following are among the factors that could cause our operating results to fluctuate significantly from period to period:

the dollar amount of agreements executed in each period, which is primarily driven by the nature and characteristics of the technology being licensed and the magnitude of infringement associated with a specific licensee;

the specific terms and conditions of agreements executed in each period and the periods of infringement contemplated by the respective payments;

fluctuations in the total number of agreements executed;

fluctuations in the sales results or other royalty-per-unit activities of our licensees that impact the calculation of license fees due;

the timing of the receipt of periodic license fee payments and/or reports from licensees;

fluctuations in the net number of active licensees period to period;

costs related to acquisitions, alliances, licenses and other efforts to expand our operations;

the timing of payments under the terms of any customer or license agreements into which our operating subsidiaries may enter; and

expenses related to, and the timing and results of, patent filings and other enforcement proceedings relating to intellectual property rights, as more fully described in this section.

TECHNOLOGY COMPANY STOCK PRICES ARE ESPECIALLY VOLATILE, AND THIS VOLATILITY MAY DEPRESS THE PRICE OF OUR COMMON STOCK.

The stock market has experienced significant price and volume fluctuations, and the market prices of technology companies have been highly volatile. We believe that various factors may cause the market price of our common stock to fluctuate, perhaps substantially, including, among others, the following:

announcements of developments in our patent enforcement actions;

developments or disputes concerning our patents;

our or our competitors’ technological innovations;

developments in relationships with licensees;

variations in our quarterly operating results;

our failure to meet or exceed securities analysts’ expectations of our financial results;

a change in financial estimates or securities analysts’ recommendations;

changes in management’s or securities analysts’ estimates of our financial performance;

changes in market valuations of similar companies;

announcements by us or our competitors of significant contracts, acquisitions, strategic partnerships, joint ventures, capital commitments, new technologies, or patents; and

failure to complete significant transactions.

For example, the NASDAQ Computer Index had a range of $585.69 - $1,183.34 during the 52-weeks ended December 31, 2009 and the NASDAQ Composite Index had a range of $1,265.52 - $2,295.80 over the same period. Over the same period, our common stock fluctuated within a range of $2.14 - $9.64.

The financial crisis affecting the banking system and financial markets and the current uncertainty in global economic conditions, which began in late 2007 and continued throughout 2009 and into 2010, have resulted in a tightening in the credit markets, a low level of liquidity in many financial markets, and extreme volatility in the credit, equity and fixed income markets. As noted above, our stock price, like many other stocks, has fluctuated significantly recently and if investors have concerns that our business, operating results and financial condition will be negatively impacted by a continuing worldwide economic downturn, our stock price could continue to fluctuate significantly in future periods.

In addition, we believe that fluctuations in our stock price during applicable periods can also be impacted by court rulings and or other developments in our patent licensing and enforcement actions. Court rulings in patent enforcement actions are often difficult to understand, even when favorable or neutral to the value of our patents and our overall business, and we believe that investors in the market may overreact, causing fluctuations in our stock prices that may not accurately reflect the impact of court rulings on our business operations and assets.

In the past, companies that have experienced volatility in the market price of their stock have been the objects of securities class action litigation. If our common stock was the object of securities class action litigation, it could result in substantial costs and a diversion of management’s attention and resources, which could materially harm our business and financial results.

WE DO NOT ANTICIPATE DECLARING ANY CASH DIVIDENDS ON OUR COMMON STOCK.

We have never declared or paid cash dividends on our common stock and do not plan to pay any cash dividends in the near future. Our current policy is to retain all funds and any earnings for use in the operation and expansion of our business. If we do not pay dividends, our stock may be less valuable to you because a return on your investment will only occur if our stock price appreciates.

Item 1B.

UNRESOLVED STAFF COMMENTS

None.

Item 2.

PROPERTIES

Our corporate, administrative and operational headquarters are located in Newport Beach, California where we lease approximately 18,302 square feet of office space, under a lease agreement that expires in February 2012. Certain of our operating subsidiaries also maintain additional leased office space in Frisco, Texas, Northbrook, Illinois, San Francisco, California, Atlanta, Georgia, San Diego, California, Brooklyn, New York and Santa Clara, California. Presently, certain of our operating subsidiaries are seeking additional office facilities in Texas. We believe that our facilities are adequate, suitable and of sufficient capacity to support our immediate needs.

Item 3.

LEGAL PROCEEDINGS

In the ordinary course of business, we are the subject of, or party to, various pending or threatened legal actions, including various counterclaims in connection with our intellectual property enforcement activities. We believe that any liability arising from these actions will not have a material adverse effect on our consolidated financial position, results of operations or cash flows.

In connection with any of our patent enforcement actions, it is possible that a defendant may request and/or a court may rule that we have violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against us or our operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material, and if required to be paid by us or our operating subsidiaries, could materially harm our operating results and our financial position.

Item 4.

SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None.

PART II

Item 5.

MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Price Range of Common Stock

Our common stock commenced trading on The NASDAQ Global Market on December 16, 2002, under the symbol “ACTG.” Prior to December 16, 2002, our only class of common stock began trading under the symbol “ACRI” on the NASDAQ National Market System on July 8, 1996.

Prior to the Split-Off Transaction. Prior to the Split-Off Transaction described above, we had two classes of common stock outstanding, our Acacia Research-Acacia Technologies common stock and our Acacia Research-CombiMatrix common stock. As a result of the Split-Off Transaction, all outstanding shares of Acacia Research-CombiMatrix common stock were redeemed, and all rights of holders of Acacia Research-CombiMatrix common stock ceased as of August 15, 2007. As a result of the consummation of the Split-Off Transaction, our only class of common stock outstanding is our common stock.

The markets for securities such as our common stock have historically experienced significant price and volume fluctuations during certain periods. These broad market fluctuations and other factors, such as new product and technology developments, business or regulatory trends in our industry and the investment markets generally, as well as economic conditions and quarterly variations in the results of our licensing and enforcement activities and our results of operations, may adversely affect the market price of our common stock.

The high and low bid prices for our common stock as reported by The NASDAQ Global Market for the periods indicated are shown in the table below. Such prices are inter-dealer prices without retail markups, markdowns or commissions and may not necessarily represent actual transactions.

	2009				2008
	Fourth Quarter	Third Quarter	Second Quarter	First Quarter	Fourth Quarter	Third Quarter	Second Quarter	First Quarter

High	$9.64	$9.59	$7.90	$4.50	$3.18	$5.20	$6.70	$9.30
Low	$6.81	$6.77	$3.82	$2.14	$1.87	$2.98	$4.20	$4.58

STOCK PRICE PERFORMANCE GRAPH

The following stock price performance graph shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or the Exchange Act, or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any of our filings under the Securities Act of 1933, as amended.

The Stock Performance Graph depicted below compares the yearly change in our cumulative total stockholder return for the last five fiscal years with the cumulative total return of The NASDAQ Stock Market (U.S.) Composite Index.

	2005	2006	2007	2008	2009

Acacia Research Corporation common stock	$130	$252	$169	$57	$172
Nasdaq Composite Index	$101	$111	$122	$72	$104
Dow Jones U.S. Technology Index	$102	$105	$116	$134	$ 77

The graph covers the period from December 31, 2004 to December 31, 2009. Cumulative total returns are calculated assuming that $100 was invested on December 31, 2004, in our common stock, in the NASDAQ Composite Index, and in the Dow Jones U.S. Technology Index, and that all dividends, if any, were reinvested. Refer to our Dividend Policy below. Stockholder returns over the indicated period should not be considered indicative of future stock prices or shareholder returns.

On February 23, 2010, there were approximately 120 owners of record of our common stock. The majority of the outstanding shares of our common stock are held by a nominee holder on behalf of an indeterminable number of ultimate beneficial owners.

Repurchase of Restricted Common Stock

In May 2009, our board of directors approved a restricted stock vesting net issuance program. Under the program, upon the vesting of unvested shares of restricted common stock, we withhold from fully vested shares of common stock otherwise deliverable to any employee-participant in our equity compensation programs, a number of whole shares of common stock having a fair market value (as determined by us as of the date of vesting) equal to the amount of tax required to be withheld by law, in order to satisfy our tax withholding obligations in connection with the vesting of such shares. Of a total of 580,600 shares of restricted stock vested between June 2009 and September 2009, 174,628 shares of common stock were withheld by us, in satisfaction of $1.1 million in required withholding tax liability. Additional repurchases under the net issuance program are not anticipated at this time.

Dividend Policy

To date, we have not declared or paid any cash dividends with respect to our common stock, and the current policy of the board of directors is to retain earnings, if any, to provide for our growth and the growth of our operating subsidiaries. Consequently, we do not expect to pay any cash dividends in the foreseeable future. Further, there can be no assurance that our proposed operations will generate revenues and cash flow needed to declare a cash dividend or that we will have legally available funds to pay dividends.

Equity Compensation Plan Information

The following table provides information with respect to shares of our common stock issuable under our equity compensation plans as of December 31, 2009:

Plan Category	(a) Number of securities to be issued upon exercise of outstanding options		(b) Weighted-average exercise price of outstanding options		(c) Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
Equity compensation plans approved by security holders
2002 Acacia Technologies Stock Incentive Plan(1)		3,398,000	$	5.38		1,350,000
2007 Acacia Technologies Stock Incentive Plan(2)		50,000	$	16.01		542,000
Subtotal		3,448,000	$	5.54		1,892,000
Equity compensation plans not approved by security holders(3)
		N/A		N/A		N/A
Total		3,448,000	$	5.54		1,892,000

(1)

Our 2002 Acacia Technologies Stock Incentive Plan, as amended, or the 2002 Plan, allows for the granting of stock options and other awards to eligible individuals, which generally includes directors, officers, employees and consultants. The 2002 Plan does not segregate the number of securities remaining available for future issuance among stock options and other awards. The shares authorized for future issuance represents the total number of shares available through any combination of stock options or other awards. The share reserve under the 2002 Plan automatically increases on the first trading day in January each calendar year by an amount equal to three percent (3%) of the total number of shares of our common stock outstanding on the last trading day of December in the prior calendar year, but in no event will this annual increase exceed 500,000 shares and in no event will the total number of shares of common stock in the share reserve (as adjusted for all such annual increases) exceed twenty million shares. Column (a) excludes 1,093,000 in nonvested restricted stock awards and restricted stock units outstanding at December 31, 2009. Refer to Note 12 to our consolidated financial statements included elsewhere herein.

(2)

Our 2007 Acacia Technologies Stock Incentive Plan, or the 2007 Plan, allows for the granting of stock options and other awards to eligible individuals, which generally includes directors, officers, employees and consultants, and was approved by security holders on May 15, 2007. The 2007 Plan does not segregate the number of securities remaining available for future issuance among stock options and other awards. The shares authorized for future issuance represents the total number of shares available through any combination of stock options or other awards. The initial share reserve under the 2007 Plan was 560,000 shares of our common stock. The share reserve under the 2007 Plan automatically increased on January 1, 2008 and 2009, by an amount equal to two percent (2%) of the total number of shares of our common stock outstanding on the last trading day of December in the prior calendar year. After January 1, 2009, no new additional shares will be added to the 2007 Plan without security holder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2007 Plan). Column (a) excludes 604,000 in nonvested restricted stock awards outstanding at December 31, 2009. Refer to Note 12 to our consolidated financial statements included elsewhere herein.

(3)	We have not authorized the issuance of equity securities under any plan not approved by security holders.

Item 6.

SELECTED FINANCIAL DATA

The consolidated selected balance sheet data as of December 31, 2009 and 2008 and the consolidated selected statements of operations data for the years ended December 31, 2009, 2008 and 2007 set forth below have been derived from our audited consolidated financial statements included elsewhere herein, and should be read in conjunction with those financial statements (including notes thereto). The consolidated selected balance sheet data as of December 31, 2007, 2006 and 2005 and the consolidated selected statements of operations data for the years ended December 31, 2006 and 2005 have been derived from unaudited consolidated financial statements not included herein, but which were previously filed with the SEC.

Consolidating Statements of Operations Data

(In thousands, except share and per share data)

	For the Years Ended December 31,
	2009			2008			2007			2006			2005

License fee revenues	$	67,340		$	48,227		$	52,597		$	34,825		$	19,574
Inventor royalties and contingent legal fees expense - patents		31,618			27,424			29,224			17,159			11,331
Litigation and licensing expenses - patents		14,055			6,900			7,799			5,047			2,838
Amortization of patents		4,634			6,043			5,583			5,313			4,922
Marketing, general and administrative expenses (including non-cash stock compensation expense)		21,070			21,130			18,381			13,550			7,526
Research, consulting and other expenses - business development		1,689			933			886			306			201
Operating loss		(5,726	)		(14,203	)		(9,511	)		(6,847	)		(7,244	)
Other income, net		302			570			2,359			1,524			1,071
Loss from continuing operations before provision for income taxes		(5,424	)		(13,633	)		(7,152	)		(5,323	)		(6,173	)
Net loss from continuing operations including noncontrolling interests in operating subsidiary		(5,633	)		(13,757	)		(7,359	)		(5,363	)		(6,038	)
Net income attributable to noncontrolling interests in operating subsidiary		(5,657	)		-			-			-			-
Net loss from continuing operations attributable to Acacia Research Corporation		(11,290	)		(13,757	)		(7,359	)		(5,363	)		(6,038	)
Discontinued operations - Split-off of CombiMatrix Corporation and other		-			-			(8,086	)		(20,093	)		(12,638	)
Net loss		(11,290	)		(13,757	)		(15,445	)		(25,456	)		(18,676	)

Loss per common share - basic and diluted:
Loss from continuing operations
Acacia Research Corporation common stock	$	(0.38	)	$	(0.47	)	$	(0.26	)	$	(0.19	)	$	(0.23	)
Discontinued operations - Split-off of CombiMatrix Corporation
Acacia Research - CombiMatrix stock		-			-		$	(0.14	)	$	(0.49	)	$	(0.37	)
Weighted average number of common and potential common shares used in computation of income (loss) per common share :
Acacia Research Corporation common stock:
Basic and diluted		29,914,801			29,423,998			28,503,314			27,547,651			26,630,732
Acacia Research - CombiMatrix stock:
Basic and diluted		-			-			55,862,707			40,605,038			33,678,603

Consolidating Balance Sheet Data

(In thousands)

	At December 31,
	2009		2008		2007		2006			2005
Total assets:
Acacia Research Corporation	$	78,256	$	73,074	$	71,051	$	65,770		$	68,893
Discontinued operations - Split-off of CombiMatrix Corporation		-		-		-		44,214			52,541
Eliminations		-		-		-		(380	)		-
Total	$	78,256	$	73,074	$	71,051	$	109,604		$	121,434
Total liabilities:
Acacia Research Corporation	$	22,287	$	14,527	$	6,247	$	4,276		$	6,647
Discontinued operations - Split-off of CombiMatrix Corporation		-		-		-		11,399			7,443
Eliminations		-		-		-		(380	)		-
Total	$	22,287	$	14,527	$	6,247	$	15,295		$	14,090
Noncontrolling interests in operating subsidiary:
Acacia Research Corporation	$	2,507	$	-	$	-	$	-		$	443
Discontinued operations - Split-off of CombiMatrix Corporation		-		-		-		-			4
Total	$	2,507	$	-	$	-	$	-		$	447
Stockholders' equity:
Acacia Research Corporation	$	53,462	$	58,547	$	64,804	$	61,494		$	61,803
Discontinued operations - Split-off of CombiMatrix Corporation		-		-		-		32,815			45,094
Total	$	53,462	$	58,547	$	64,804	$	94,309		$	106,897

Factors Affecting Comparability:

Effective January 1, 2006, we adopted the provisions of ASC Topic 718, “Compensation - Stock Compensation,” which sets forth the accounting requirements for “share-based” compensation payments to employees and non-employee directors and requires that compensation cost relating to share-based payment transactions be recognized in the statement of operations. Refer to Note 2 and Note 12 to our consolidated financial statements included elsewhere herein, for additional information and a description of the impact of ASC Topic 718 on our consolidated statements of operations data presented above. Non-cash stock compensation expense included in marketing, general and administrative expense was $7,065,000, $7,355,000, $5,908,000 and $3,946,000 in 2009, 2008, 2007 and 2006, respectively.

We recorded an other than temporary impairment loss of $47,000 and $486,000 on certain auction rate securities held as of December 31, 2009 and December 31, 2008, respectively.

As a result of the Split-Off Transaction, as discussed above, we disposed of our investment in CombiMatrix. Refer to Note 11 to our consolidated financial statements, included elsewhere herein, for information regarding presentation of the assets, liabilities, results of operations and cash flows for the CombiMatrix group as “Discontinued Operations,” for all periods presented, in accordance with guidance set forth in ASC Topic 360.

Refer to Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies” below for information regarding the change in accounting policy for term license agreements effective October 2009.

Item 7.

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion should be read in conjunction with our consolidated financial statements included elsewhere in this Form 10-K. This discussion contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of various factors including those set forth under item 1A. “Risk Factors” elsewhere herein.

General

Our operating subsidiaries acquire, develop, license and enforce patented technologies. Our operating subsidiaries generate license fee revenues and related cash flows from the granting of licenses for the use of patented technologies that our operating subsidiaries own or control. Our operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, if necessary, with the enforcement against unauthorized users of their patented technologies. We are a leader in licensing patented technologies and have established a proven track record of licensing success with over 740 license agreements executed to date, across 60 of our technology license programs. Currently, on a consolidated basis, our operating subsidiaries own or control the rights to over 140 patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

The intellectual property acquisition, development, licensing and enforcement business conducted by our operating subsidiaries, is described more fully in Item 1, “Business,” of this report.

CombiMatrix Group Split-Off Transaction and Related Discontinued Operations. As discussed below under the caption “Discontinued Operations – Split-Off of CombiMatrix Corporation,” the CombiMatrix group, which was previously presented as a separate reportable segment, was split-off from us effective August 15, 2007. As such, the historical results of operations for the CombiMatrix group in the accompanying consolidated financial statements are presented as part of our results from “Discontinued Operations” for the applicable historical periods presented. Subsequent to the Split-Off Transaction, our only business is our intellectual property licensing business.

Overview

Our operating activities during 2009, 2008 and 2007 were principally focused on the continued development, licensing and enforcement of the patent portfolios owned or controlled by our operating subsidiaries, including the continued pursuit of multiple ongoing technology licensing and enforcement programs and the commencement of new technology licensing and enforcement programs. In addition, we continued our focus on business development, including the acquisition of several additional patent portfolios by certain of our operating subsidiaries and the continued pursuit of additional opportunities to partner with patent owners and continue our unique intellectual property licensing, development and enforcement activities.

We recognized license fee revenues of $67.3 million in 2009, a 40% increase compared to 2008 license fee revenues of $48.2 million, and a 28% increase compared to 2007 license fee revenues of $52.6 million.

Revenues for 2009 included license fees from 117 new licensing agreements covering 30 of our technology licensing and enforcement programs, as compared to 80 new licensing agreements covering 30 of our technology licensing and enforcement programs in 2008 and 91 new licensing agreements covering 16 of our technology licensing and enforcement programs in 2007. On a consolidated basis, our operating subsidiaries generated licensing revenues from 12 new technology licensing and enforcement programs during 2009, as compared to 20 new programs in 2008 and 8 new programs in 2007. As of December 31, 2009, we have generated revenues from 60 technology licensing and enforcement programs, as compared to 48 programs as of December 31, 2008 and 28 programs as of December 31, 2007.

During 2009, we recorded initial license fee revenues from 12 new technology licensing programs, including our Database Access technology, Surgical Catheter technology, Encrypted Media & Playback Devices technology, Child-friendly Secure Mobile Phones technology, Heated Surgical Blades technology, Lighting Ballast technology, High Performance Computer Architecture technology, Online Promotion technology, Multi-Dimensional Database Compression technology, Document Generation technology, Internet Radio Advertising technology and our Virtual Server technology. Revenues for 2009 also included fees from the licensing of our DMT® technology, Telematics technology, Pop-up Internet Advertising technology, Audio Communications Fraud Detection technology, Picture Archiving & Communication Systems technology, Projector technology, Rule Based Monitoring technology, Credit Card Fraud Protection technology, Remote Management of Imaging Devices technology, Vehicle Maintenance technology, Medical Image Stabilization technology, Audio Video Enhancement & Synchronization technology, Location Based Services technology, eCommerce Pricing technology, High Quality Image Processing technology, Authorized Spending Accounts technology, Storage technology and Online Auction Guarantee technology.

During 2008, we recorded initial license fee revenues for 20 of our technology licensing programs, including our Vehicle Anti-Theft Parking Systems technology, Online Auction Guarantee technology, Projector technology, Web Personalization technology, Vehicle Maintenance technology, Physical Access Control technology, High Resolution Optics technology, Software License Management technology, Authorized Spending Accounts technology, Picture Archiving & Communications System technology, Video Editing technology, Electronic Message Advertising technology, Remote Management of Imaging Devices technology, High Quality Image Processing technology, Wireless Traffic Information technology, Medical Image Stabilization technology, Storage technology, Ecommerce Pricing technology, Location Based Services technology and File Locking in Shared Storage Networks technology. Revenues for 2008 also included fees from the licensing of our Audio Communications Fraud Detection technology, Audio Video Enhancement & Synchronization technology, Credit Card Fraud Protection technology, DMT® technology, Electronic Address List Management technology, Image Resolution Enhancement technology, Pop-up Internet Advertising technology, Portable Storage Devices with Links technology, Rule-Based Monitoring technology and Telematics technology.

During 2007, we recorded initial license fee revenues for 8 of our technology licensing programs, including our Portable Storage Devices with Links technology, Color Correction for Video Graphics Systems technology, Rule Based Monitoring technology, Spreadsheet Automation technology, Virtual Computer Workspace technology, Electronic Address List Management technology, Vehicle Magnetic Braking technology and our Telematics technology. Revenues for 2007 also included fees from the licensing of our DMT® technology, Audio/Video Enhancement and Synchronization technology, Image Resolution Enhancement technology, Credit Card Fraud Control technology, Multi-Dimensional Bar Code technology, Product Activation technology, Audio Communications Fraud Detection technology and our Pop-up Advertising technology.

Our revenues historically have fluctuated quarterly based on the number of patented technology portfolios owned or controlled by our operating subsidiaries, the timing and results of patent filings and other enforcement proceedings relating to our intellectual property rights, the number of active licensing programs, and the relative maturity of active licensing programs during the applicable periods. Additional factors impacting the amount of license fee revenues recognized each period are included below. Although license fee revenues from one or more of our patents or patent portfolios may be significant in a specific reporting period, we believe that none of our patents or patent portfolios are individually significant to our licensing and enforcement business as a whole.

We measure and assess the performance and growth of the patent licensing and enforcement business conducted by our operating subsidiaries based on consolidated license fee revenues recognized across all of our technology licensing and enforcement programs on a trailing twelve-month basis. Trailing twelve-month revenues totaled $67.3 million as of December 31, 2009, as compared to $65.7 million as of September 30, 2009, $63.4 million as of June 30, 2009, $56.1 million as of March 31, 2009, $48.2 million as of December 31, 2008, and $52.6 million as of December 31, 2007. In addition, we also measure and assess the performance and growth of the patent licensing and enforcement business conducted by our operating subsidiaries based on the number of patent portfolios owned or controlled by our operating subsidiaries on a consolidated basis. As of December 31, 2009, 2008 and 2007, on a consolidated basis, our operating subsidiaries owned or controlled the rights to approximately 135, 100 and 90 patent portfolios, respectively, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

The consolidated net loss for 2009 was $11.3 million, as compared to $13.8 million for 2008 and $15.4 million for 2007. Results for 2009 included non-cash charges totaling $11.7 million, comprised of non-cash stock compensation charges of $7.1 million and non-cash patent amortization charges of $4.6 million. Results for 2008 included non-cash charges of $13.4 million, comprised of non-cash stock compensation charges of $7.4 million and non-cash patent amortization charges of $6.0 million. Results for 2007 included non-cash charges of $11.5 million, comprised of non-cash stock compensation charges of $5.9 million and non-cash patent amortization charges of $5.6 million.

Marketing, general and administrative expenses for 2009 (including non-cash stock compensation charges of $7.1 million) were $21.1 million, as compared to $21.1 million (including non-cash stock compensation charges of $7.4 million) for 2008 and $18.4 million (including non-cash stock compensation charges of $5.9 million) for 2007. Excluding the impact of the decrease in non-cash stock compensation in 2009, as compared to 2008, marketing, general and administrative expenses remained relatively flat for the same periods. Marketing, general and administrative expenses increased during 2008, as compared to 2007, due primarily to the hiring of additional patent licensing, business development and engineering personnel and an increase and other personnel costs, an increase in non-cash stock compensation charges and an increase in corporate, general and administrative costs related to the growth of ongoing operations.

In the aggregate, inventor royalties, net income attributable to noncontrolling interests in operating subsidiary and contingent legal fees expenses for 2009 increased by 36%, as compared to 2008, and decreased 6% in 2008, as compared to 2007, versus an increase of 40% and a decrease of 8% in related license fee revenues for the same periods, as discussed above.

Litigation and licensing expenses - patents for 2009, 2008 and 2007 were $14.1 million, $6.9 million and $7.8 million, respectively. Litigation and licensing expenses-patents fluctuate from period to period based on patent enforcement and prosecution activity associated with ongoing licensing and enforcement programs and the timing of the commencement of new licensing and enforcement programs in each period. Litigation and licensing expenses - patents increased for 2009, as compared to 2008 and 2007, due to an increase in litigation and licensing support related out of pocket expenses, third party technical consulting expenses, professional expert expenses and other litigation support and administrative costs incurred in connection with our investment in certain of our licensing and enforcement programs that went to trial and concluded in 2009, licensing and enforcement programs with trial dates scheduled for 2010, and a net increase in costs related to new licensing and enforcement programs commenced since the end of the prior year periods.

We expect patent-related legal expenses to continue to fluctuate period to period based on the factors summarized above, in connection with upcoming scheduled trial dates and our current and future patent acquisition, development, licensing and enforcement activities.

We pursue enforcement actions in connection with our licensing and enforcement programs which can involve certain risks and uncertainties, including the following:

Increases in patent litigation related legal expenses, including, but not limited to, increases in costs billed by outside legal counsel for discovery, depositions, economic analyses, damages assessments, expert witnesses and other consultants, case-related audio/video presentations and other litigation support and administrative costs, could increase our operating costs and decrease our revenue generating opportunities;

Our patented technologies and enforcement actions are complex, and, as a result, we may be required to appeal adverse decisions by trial courts in order to successfully enforce our patents;

New legislation, regulations or rules related to enforcement actions could significantly increase our operating costs and decrease our revenue generating opportunities; and

Courts may rule that our subsidiaries have violated certain statutory, regulatory, federal, local or governing rules or standards by pursuing such enforcement actions, which may expose us and our operating subsidiaries to material liabilities, which could harm our operating results and our financial position.

Investments in Patent Portfolios

Our operating subsidiaries intend to sustain the long term growth of our intellectual property licensing and enforcement business through the identification and acquisition of, or the rights to, additional core patented technologies, across a wide range of technology areas that have been, or are anticipated to be, widely adopted by third parties in connection with the manufacture or sale of products and services. During 2009, certain of our operating subsidiaries continued to execute their business strategy in the area of patent portfolio acquisitions. Patent portfolio acquisition costs for 2009 totaled $9.6 million, as compared to $2.1 million in 2008 and $3.8 million in 2007.

The total number of patents, associated U.S. applications and foreign counterparts per portfolio acquired during the year ended December 31, 2009 ranged from one to 59. Several of the patent portfolios acquired in 2009 were acquired in connection with partnering arrangements executed with major technology companies, reflecting our continued identification of opportunities to partner not only with individual inventors and small to medium size technology companies, but also major well established technology companies with larger patent portfolios.

Of the $9.6 million in patent acquisition costs invested during the year ended December 31, 2009, we have a contractual guarantee to receive a minimum of $5.0 million in net proceeds, which significantly reduces the risk associated with these initial investments. The majority of remaining acquisition costs incurred are subject to contractual provisions providing for higher percentage returns to our operating subsidiaries early on in the licensing and enforcement program until such initial upfront acquisition costs are fully recovered.

The higher level of acquisition costs incurred in 2009 reflects our continued identification of opportunities to partner with major technology companies and exchange up front, advanced royalty payments to patent owners, for a reduced future inventor royalty percentage, resulting in the potential for higher returns on our investments in connection with future licensing and enforcement activities.

Acquisitions during 2009 included the acquisition of, or the acquisition of the rights to, 30 patent portfolios covering a variety of applications, including the following:

Online Promotion. This patented technology generally relates to online promotion of consumer products and can be used to provide consumers with web access to discount coupons and rebate offers.

Interactive Mapping. This patented technology generally relates to interactive maps and can be used to provide user-generated data, such as places of interest or reviews, over the Internet.

Improved Anti-Trap Safety. This patented technology can be used to adapt automatic vent closure to changes, such as environment or mechanical wear. This technology may be applicable to vehicles that implement anti-pinch/anti-trap safety systems on powered vents such as windows, doors and sunroofs.

Improved Commercial Print. This patented technology can eliminate various print artifacts while improving resolution, color and ink consumption from commercial presses. Printers can benefit from these improvements, particularly those who specialize in high volume press work.

Electronic Securities Trading. This patented technology generally relates to tools for automated electronic securities trading and may be used in online trading.

User Programmable Engine Control. This patented technology generally relates to the user interface for the engine control module, or ECM, and offers control and calibration of the ECM including input and output parameters controlling engine performance.

Wireless LAN. This patented technology generally relates to wireless local area networking, or WLAN, and includes communications architectures for use in spread spectrum systems. This technology can be used in equipment such as laptops, wireless routers, access points, handsets and other consumer electronics devices with WLAN capability.

Network Monitoring. This patented technology generally relates to monitoring and reporting on management and financial characteristics of networks and can be used to help organizations make resource decisions.

Medical Image Manipulation. This patented technology generally relates to the manipulation of medical images and can be used in the surgical process.

Consumer Rewards Program. This patented technology generally relates to consumer rewards programs such as loyalty programs offered by airlines, hotels and credit card companies and may be used to provide a single source for consumers to access and utilize applicable benefits under different loyalty programs.

Messaging. This patented technology generally relates to a communications messaging platform that notifies the user after receiving messages and enables the user to access the messages via a browser. The platform may receive messages in multiple formats, such as voice, text, or image.

Computer Architecture and Power Management. These patented technologies generally relate to computer architecture and power management. These technologies can be used in computers, servers, cell phones, game consoles, microprocessors and other electronic systems.

Records Management. This patented technology generally relates to enabling individuals in an enterprise to uniformly classify records.

Digital Video Enhancement. This patented technology generally relates to the enhancement of digital video images and has applications in a wide variety of consumer electronics products, such as TV’s, DVD/Blu-ray players, game consoles, smart phones and cameras, in reducing artifacts created during digital video encoding.

Biosensor. This patented technology generally relates to biosensors, such as those used in drug discovery.

Integrated Access. This patented technology includes the delivery of triple play (voice, video and data) services and can be used in installations that incorporate set top boxes and/or voice/data gateways.

Mobile Computer Synchronization. The patent portfolio includes patents relating to the synchronization of data between mobile and fixed computer systems. This technology may be used to keep email, contacts, calendar information and other data synchronized between mobile devices (such as personal digital assistants, or PDA’s, and smart phones) and servers or desktop computers.

MEMS. This patented technology generally relates to micromechanical components which can be integrated with electronic circuits to form microelectromechanical systems known as MEMS. This technology can be used in automobiles, medical devices, mobile phones and other consumer products.

Digital Signal Processing Architecture. This patented technology generally relates to instructions that can be used to implement signal processing techniques in a digital signal processor.

Software Installation. This patented technology generally relates to creating and maintaining desired configurations of software.

Distributed Data Management and Synchronization. This patented technology generally relates to the distributed management and synchronization of select data elements between applications based on pre-defined permissions.

During 2008, we acquired a total of 20 new patent portfolios with applications over a wide range of technology areas as compared to 31 new patent portfolios in 2007.

As of December 31, 2009, certain of our operating subsidiaries had several option agreements with third-party patent portfolio owners regarding the potential acquisition of additional patent portfolios. Future patent portfolio acquisitions will continue to expand and diversify our future revenue generating opportunities.

Critical Accounting Policies

Our consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. In preparing these financial statements, we make assumptions, judgments and estimates that can have a significant impact on amounts reported in our consolidated financial statements. We base our assumptions, judgments and estimates on historical experience and various other factors that we believe to be reasonable under the circumstances. Actual results could differ materially from these estimates under different assumptions or conditions. On a regular basis, we evaluate our assumptions, judgments and estimates and make changes accordingly.

We believe that, of the significant accounting policies discussed in Note 2 to our consolidated financial statements, the following accounting policies require our most difficult, subjective or complex judgments:

revenue recognition;

stock-based compensation expense;

valuation of long-lived and intangible assets; and

impairment of marketable securities;

We discuss below the critical accounting assumptions, judgments and estimates associated with these policies. Historically, our assumptions, judgments and estimates relative to our critical accounting policies have not differed materially from actual results. For further information on our critical accounting policies, refer to Note 2 to the consolidated financial statements included herein.

Revenue Recognition

Change in Accounting Policy for Term License Agreements. Certain license agreements provide for the payment of a minimum upfront annual license fee at the inception of each annual license term, hereinafter referred to as “term license agreements.” Effective October 1, 2009, we elected to change our method of accounting for our term license agreements to recognize revenue when delivery of the license has occurred, which is typically at the time of execution of the related license agreement, or upon receipt of the applicable minimum upfront annual renewal license fee payment, and when all other revenue recognition criteria, as described below, have been met. Prior to the change in method of accounting, license fees for term license agreements were deferred and amortized to revenue on a straight-line basis over the applicable contractual license term. The new method was adopted as it provides a consistent approach to accounting for all of our license arrangements with similar significant terms and conditions and more closely reflects the culmination of the earnings process associated with these revenue arrangements. Refer to Exhibit 18.1 for related preferability letter issued by our independent registered public accounting firm regarding the change in accounting policy as required by Rule 10-01(b)(6) of Regulation S-X.

The change was accounted for through retrospective application of the new accounting policy as of January 1, 2009. The effect of applying the new accounting policy to term license agreements in periods prior to January 1, 2009 was not material. Accordingly, our consolidated financial statements for years ending prior to January 1, 2009 have not been retroactively adjusted for this change in accounting policy. Refer to Note 8 to the consolidated financial statement for information on the effect of the change in accounting policy on our consolidated financial statement line items for the applicable 2009 interim reporting periods.

As described below, significant management judgments must be made and used in connection with the revenue recognized in any accounting period. Material differences may result in the amount and timing of revenue recognized or deferred for any period, if management made different judgments.

Revenue is recognized, in accordance with ASC Topic 605, “Revenue Recognition,” or ASC Topic 605, when (i) persuasive evidence of an arrangement exists, (ii) all obligations have been performed pursuant to the terms of the agreement, (iii) amounts are fixed or determinable and (iv) collectibility of amounts is reasonably assured.

We make estimates and judgments when determining whether the collectibility of license fees receivable from licensees is reasonably assured. We assess the collectibility of license fees receivable based on a number of factors, including past transaction history and the credit-worthiness of licensees. If it is determined that collection is not reasonably assured, the fee is recognized when collectibility becomes reasonably assured, assuming all other revenue recognition criteria have been met, which is generally upon receipt of cash for transactions where collectibility may have been an issue. Management estimates regarding collectibility impact the actual revenues recognized each period and the timing of the recognition of revenues. Our assumptions and judgments regarding future collectibility could differ from actual events, thus materially impacting our financial position and results of operations.

Certain license agreements provide for the payment of contractually determined paid-up license fees to our operating subsidiaries in consideration for the grant of a non-exclusive, retroactive and future license to manufacture and/or sell products covered by patented technologies owned or controlled by our operating subsidiaries. Generally, the execution of these license agreements also provide for the release of the licensee from certain past and future claims, and the dismissal of any pending litigation. Pursuant to the terms of these agreements, our operating subsidiaries have no further obligation with respect to the grant of the non-exclusive retroactive and future license and related releases, including no express or implied obligation on our operating subsidiaries’ part to maintain or upgrade the technology, or provide future support or services. Generally, the agreements provide for the grant of the license and releases upon execution of the agreement. As such, the earnings process is generally complete upon the execution of the agreement, and as a result, revenue is recognized upon execution of the agreement, when collectibility is reasonably assured, and all other revenue recognition criteria have been met. Depending on the complexity of the underlying license agreement and related terms and conditions, significant judgments, assumptions and estimates may be required to determine when substantial delivery of contract elements has occurred, whether any significant ongoing obligations exist subsequent to contract execution, whether amounts due are collectible and the appropriate period or periods, in which, or during which, respectively, the completion of the earning process occurs. Depending on the magnitude of specific license agreements, if different judgments, assumptions and estimates are made regarding contracts executed in any specific period, our periodic financial results may be materially affected.

Our operating subsidiaries are responsible for the licensing and enforcement of their respective patented technologies and pursue third parties that are utilizing their intellectual property without a license or who have under-reported the amount of royalties owed under a license agreement. As a result of these activities, from time to time, our operating subsidiaries may recognize royalty revenues in a current period that relate to infringements by licensees that occurred in prior periods. These royalty recoveries may cause revenues to be higher than expected during a particular reporting period and may not occur in subsequent periods. Differences between amounts initially recognized and amounts subsequently audited or reported as an adjustment to those amounts, are recognized in the period such adjustment is determined as a change in accounting estimate.

Stock-based Compensation Expense

ASC Topic 718, “Compensation – Stock Compensation,” or ASC Topic 718, sets forth the accounting requirements for “share-based” compensation payments to employees and non-employee directors and requires all share based-payments to be recognized as expense in the statement of operations. The compensation cost for all stock-based awards is measured at the grant date, based on the fair value of the award (determined using a Black-Scholes option pricing model for stock options and intrinsic value on the date of grant for nonvested restricted stock), and is recognized as an expense over the employee’s requisite service period (generally the vesting period of the equity award). Determining the fair value of stock-based awards at the grant date requires significant estimates and judgments, including estimating the market price volatility of our common stock, future employee stock option exercise behavior and requisite service periods.

ASC Topic 718 also requires stock-based compensation expense to be recorded only for those awards expected to vest using an estimated pre-vesting forfeiture rate. As such, ASC Topic 718 requires us to estimate pre-vesting option forfeitures at the time of grant and reflect the impact of estimated pre-vesting option forfeitures on compensation expense recognized. Estimates of pre-vesting forfeitures must be periodically revised in subsequent periods if actual forfeitures differ from those estimates. We consider several factors in connection with our estimate of pre-vesting forfeitures including types of awards, employee class, and historical pre-vesting forfeiture data. The estimation of stock awards that will ultimately vest requires judgment, and to the extent that actual results differ from our estimates, such amounts will be recorded as cumulative adjustments in the period the estimates are revised. If actual results differ significantly from these estimates, stock-based compensation expense and our results of operations could be materially impacted.

Refer to Notes 2 and 12 to our consolidated financial statements included in Part IV, Item 15 of this report for more information.

Valuation of Long-lived and Intangible Assets

We review long-lived assets, including patent-related intangibles, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Factors we consider important, which could trigger an impairment review include the following:

significant underperformance relative to expected historical or projected future operating results;

significant changes in the manner of our use of the acquired assets or the strategy for our overall business;

significant negative industry or economic trends;

significant adverse changes in legal factors or in the business climate, including adverse regulatory actions or assessments; and

significant decline in our stock price for a sustained period.

We calculate estimated future undiscounted cash flows, before interest and taxes, resulting from the use of the asset and its estimated value at disposal and compare it to its carrying value in determining whether impairment potentially exists. If a potential impairment exists, a calculation is performed to determine the fair value of the long-lived asset. This calculation is based on a valuation model and discount rate commensurate with the risks involved. Third party appraised values may also be used in determining whether impairment potentially exists.

As described above, in assessing the recoverability of intangible assets, significant judgment is required in connection with estimates of market values, estimates of the amount and timing of future cash flows, and estimates of other factors that are used to determine the fair value of the respective assets. If these estimates or related projections change in future periods, future intangible asset impairment tests may result in charges to earnings. Refer to Note 6 to the consolidated financial statements, included elsewhere herein, for information on impairment charges recorded during the periods presented.

Impairment of Marketable Securities

Effective January 1, 2008, we adopted ASC Topic 820, “Fair Value Measurements and Disclosures,” or ASC Topic 820. ASC Topic 820 establishes a common definition for fair value to be applied to U.S. generally accepted accounting principles guidance requiring use of fair value, establishes a framework for measuring fair value, and expands disclosure about such fair value measurements. ASC Topic 820 defines fair value as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. ASC Topic 820 also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available. ASC Topic 820 established a three-level hierarchy of valuation techniques used to measure fair value, defined as follows:

Level 1 - Observable Inputs: Quoted prices in active markets for identical investments;

Level 2 - Pricing Models with Significant Observable Inputs: Other significant observable inputs, including quoted prices for similar investments, interest rates, credit risk, etc.; and

Level 3 - Unobservable Inputs: Significant unobservable inputs, including the entity’s own assumptions in determining the fair value of investments.

ASC Topic 820 requires the use of observable market inputs (quoted market prices) when measuring fair value and requires a Level 1 quoted price to be used to measure fair value whenever possible.

At December 31, 2009 and 2008, our investments were comprised of auction rate securities classified as available-for-sale, which are reported at fair value, and included in Level 3 of the valuation hierarchy prescribed by ASC Topic 820. The fair values of auction rate securities included in Level 3 of the hierarchy of valuation techniques are estimated utilizing an analysis of certain unobservable inputs and by reference to a discounted cash flow analysis. These analyses consider, among other items, the underlying structure of each security, the collateral underlying the security investments, the creditworthiness of the counterparty, the present value of future principal and contractual interest payments discounted at rates considered to be reflective of current market conditions, consideration of the probabilities of default, continued auction failure, or repurchase or redemption at par for each period, and estimates of the time period over which liquidity related issues will be resolved. Observable market data for instruments with similar characteristics to our auction rate securities is also considered when possible.

Significant judgment is required in connection with the assumptions and inputs included in the discounted cash flow analysis and estimates of other factors that are used to determine the fair value of our marketable securities. If these estimates and assumptions change in future periods, future estimates of the fair value of our marketable securities may result in additional charges to earnings.

We review impairments associated with our investments in marketable securities to determine the classification of any impairment as “temporary” or “other-than-temporary.” For investments classified as available-for-sale, unrealized losses that are other than temporary are recognized in the consolidated statements of operations. An impairment is deemed other than temporary unless (a) we have the ability and intent to hold an investment for a period of time sufficient for recovery of its carrying amount and (b) positive evidence indicating that the investment's carrying amount is recoverable within a reasonable period of time outweighs any evidence to the contrary. All available evidence, both positive and negative, is considered to determine whether, based on the weight of that evidence, the carrying amount of the investment is recoverable within a reasonable period of time.

Refer to “Consolidated Results of Operations – Other” below for information regarding other-than-temporary charges recorded in the consolidated statements of operations for the years ended December 31, 2009 and 2008.

Consolidated Results of Operations

Comparison of the Results of Operations for the years ended December 31, 2009, 2008 and 2007

Net Loss Attributable to Acacia Research Corporation (In thousands)

	2009			2008			2007
Net loss from continuing operations attributable to Acacia Research Corporation	$	(11,290	)	$	(13,757	)	$	(7,359	)
Loss from discontinued operations - Split-off of CombiMatrix Corporation		-			-			(8,086	)
Net loss		(11,290	)		(13,757	)		(15,445	)

The changes in consolidated loss from continuing operations were primarily due to operating results and activities, as discussed below.

Revenues (In thousands)

		2009				2008				2007
License fees		$	67,340			$	48,227			$	52,597

License Fees. Revenues for 2009 included license fees from 117 new licensing agreements covering 30 of our technology licensing and enforcement programs, as compared to 80 new licensing agreements covering 30 of our technology licensing and enforcement programs in 2008, and 91 new licensing agreements covering 16 of our technology licensing and enforcement programs in 2007.

Two licensees individually accounted for 15% and 12% of license fee revenue recognized during the year ended December 31, 2009, two licensees individually accounted for 13% and 12% of license fee revenue recognized during the year ended December 31, 2008, and two licensees individually accounted for 19% and 12% of license fee revenue recognized during the year ended December 31, 2007.

On a consolidated basis, as of December 31, 2009, 60 of our licensing programs had begun generating licensing revenues, up from 48 as of December 31, 2008 and 28 as of December 31, 2007.

License fee revenues recognized by our operating subsidiaries fluctuate from period to period primarily based on the following factors:

the dollar amount of agreements executed each period, which is primarily driven by the nature and characteristics of the technology being licensed and the magnitude of infringement associated with a specific licensee;

the specific terms and conditions of agreements executed each period and the periods of infringement contemplated by the respective payments;

fluctuations in the total number of agreements executed;

fluctuations in the sales results or other royalty per unit activities of our licensees that impact the calculation of license fees due;

the timing of the receipt of periodic license fee payments and/or reports from licensees; and

fluctuations in the net number of active licensees period to period.

The 40% increase in license fee revenues for 2009, as compared to 2008, was due primarily to an increase in the number of new licensing agreements executed during the period, which was partially offset by a minor decrease in the average revenue per license agreement executed during the same periods. The 8% decrease in license fee revenues for 2008, as compared to 2007, was due to a decrease in the number of license agreements executed during 2008, as compared to 2007, which was partially offset by a minor increase in the average revenue per license agreement executed during the same periods.

Cost of Revenues and Net Income Attributable to Noncontrolling Interests (In thousands)

	2009		2008		2007
Cost of revenues:
Inventor royalties	$	15,673	$	14,995	$	12,050
Contingent legal fees		15,945		12,429		17,174
Litigation and licensing expenses - patents		14,055		6,900		7,799
Amortization of patents		4,634		6,043		5,583
Net income attributable to noncontrolling interests in operating subsidiary		5,657		-		-

Inventor Royalties, Net Income Attributable to Noncontrolling Interests in Operating Subsidiary and Contingent Legal Fees Expense. Net income attributable to noncontrolling interests in operating subsidiary, represents the portion of net proceeds from the licensing and enforcement activities of our majority-owned operating subsidiary that are distributable to the operating subsidiary’s noncontrolling interest holders pursuant to the underlying operating agreement. The economic terms of the inventor agreements, operating agreements and contingent legal fee arrangements, if any, including royalty rates, contingent fee rates and other terms, vary across the patent portfolios owned or controlled by our operating subsidiaries. As such, inventor royalties, payments to noncontrolling interests in operating subsidiaries and contingent legal fees expenses fluctuate period to period, based on the amount of revenues recognized each period and the mix of specific patent portfolios with varying economic terms generating revenues each period.

	2009 vs. 2008				2008 vs. 2007
Increase (decrease) in license fee revenues		40	%			(8	%)
Increase (decrease) in inventor royalties expense, net income attributable to noncontrolling interests in operating subsidiary and contingent legal fees expense		36	%	Note a		(6	%)	Note a
Increase in inventor royalties and net income attributable to noncontrolling interests in operating subsidiary		42	%	Note b		24	%	Note d
Increase (decrease) in contingent legal fees expense		28	%	Note c		(28	%)	Note e

	2009			2008			2007
Inventor royalties and net income attributable to noncontrolling interests in operating subsidiary as a percentage of license fee revenues		32	%		31	%		23	%
Contingent legal fees expenses as a percentage of license fee revenues		24	%		26	%		33	%
Inventor royalties, net income attributable to noncontrolling interests in operating subsidiary and contingent legal fees, combined, as a percentage of license fee revenues		55	%		57	%		56	%

The increase (decrease) in inventor royalties, noncontrolling interests in operating subsidiary and contingent legal fees, in the aggregate, is consistent with the related increase (decrease) in license fee revenues for the periods presented.

The increase is due primarily to the increase in related license fee revenues and a 1% increase in inventor royalties and noncontrolling interests in operating subsidiaries as a percentage of license fee revenues.

Increase due to increase in related license fee revenues, partially offset by a decrease in contingent legal fees as a percentage of license fee revenues due to certain patent portfolios with lower contingent fee rates generating revenues during 2009, as compared to the patent portfolios generating revenues during 2008.

Certain patent portfolios generating revenues in 2007 had inventor agreements with lower than average inventor royalty rates, as compared to those patent portfolios generating revenues in 2008, resulting in the 24% increase in inventor royalties expenses in 2008, versus 2007, as compared to the 8% decrease in license fee revenues during the same periods. In addition, the lower contingent legal fee rates for certain patent portfolios generating revenue in 2008 also contributed to the period to period increase in inventor royalties expenses as a percentage of license fee revenues recognized.

Certain patent portfolios generating revenues in 2008 had contingent legal arrangements with lower applicable contingent fee rates, as compared to those patent portfolios generating revenues in 2007, resulting in the 28% decrease in contingent legal fees expenses in 2008, versus 2007, as compared to the 8% decrease in license fee revenues during the same periods.

Litigation and Licensing Expenses - Patents. Litigation and licensing expenses-patents include patent-related prosecution and enforcement costs incurred by outside patent attorneys engaged on an hourly basis and the out-of-pocket expenses incurred by law firms engaged on a contingent fee basis. Litigation and licensing expenses-patents also includes licensing and enforcement related third-party patent research, development, consulting, and other costs incurred in connection with the licensing and enforcement of patent portfolios. Litigation and licensing expenses-patents fluctuate from period to period based on patent enforcement and prosecution activity associated with ongoing licensing and enforcement programs and the timing of the commencement of new licensing and enforcement programs in each period.

The net increase during 2009, as compared to 2008, is primarily due to an increase in litigation and licensing support related out of pocket expenses, third party technical consulting expenses, professional expert expenses and other litigation support and administrative costs incurred in connection with our continued investment in certain of our licensing and enforcement programs that went to trial and concluded in 2009, licensing and enforcement programs with trial dates scheduled for 2010, and a net increase in costs related to new licensing and enforcement programs commenced since the end of the prior year period.

In 2007, we incurred increased litigation support related out of pocket expenses, third party technical consulting expenses and professional expert expenses incurred in connection with certain of our patent portfolios that were further along in the prosecution of the related litigation and certain of our enforcement actions that proceeded to trial and concluded, resulting in increased patent –related legal expenses in 2007, as compared to 2008. During 2008, none of our ongoing enforcement actions went to trial, despite an increase in the overall number of outstanding enforcement actions during the period.

Amortization of Patents. Patent amortization expense decreased in 2009, as compared to 2008, primarily due to higher amortization expense recorded in 2008 resulting from the acceleration of amortization on a patent portfolio as described below, and a scheduled decrease in amortization totaling $950,000, which was partially offset by an increase in amortization expense related to new patent portfolios acquired during 2009 totaling $635,000.

During the fourth quarter of 2008, pursuant to the terms of the respective inventor agreements, our management elected to terminate our rights to exclusively license a patent portfolio. As such, the economic useful life of the patent-related intangible asset was reduced, resulting in the acceleration of $1,094,000 of amortization expense for the patent-related asset and an increase in amortization expense in 2008, as compared to 2007. This increase was partially offset by a reduction in scheduled amortization expense resulting from the completion of amortization on certain portfolios acquired in connection with significant patent portfolio acquisitions in January 2005.

Operating Costs and Expenses (In thousands)

	2009		2008		2007
Marketing, general and administrative expenses (including non-cash stock compensation expense of $7,065 for 2009, $7,355 for 2008 and $5,908 for 2007)	$	21,070	$	21,130	$	18,381
Research, consulting and other expenses - business development		1,689		933		886

Marketing, General and Administrative Expenses. Marketing, general and administrative expenses include employee compensation and related personnel costs, including non-cash stock compensation expenses, office and facilities costs, legal and accounting professional fees, business development related research and consulting costs, public relations, marketing, stock administration and other corporate costs.

A summary of the main drivers of the change in marketing, general and administrative expenses, including the impact of non-cash stock compensation charges, for the periods presented, is as follows (in thousands):

	2009 vs. 2008			2008 vs. 2007
Addition of licensing, business development and engineering personnel and other personnel costs	$	464		$	1,510
Consulting expenses paid to former CEO of Global Patent Holdings, LLC		-			(74	)
One time employee severance charges		(68	)		(129	)
Foreign taxes paid on licensing fees		(120	)		(27	)
Corporate, general and administrative costs		(46	)		22
Non-cash stock compensation expense		(290	)		1,447

Excluding non-cash stock compensation expense, the overall increase in marketing, general and administrative expenses is reflective of the continued growth and expansion of our intellectual property acquisition, licensing and enforcement business conducted by our operating subsidiaries and related ongoing operations.

The fluctuation in non-cash stock compensation expense period to period is based primarily on the average fair value of equity-based incentive awards granted and expensed each period, and the number of equity based incentive awards granted and expensed each period. The weighted-average grant date fair value of equity-based incentive awards expensed during 2009, 2008 and 2007, which is generally based on the grant date market value of our common stock, was approximately $8.17, $11.66 and $9.95, respectively. The weighted-average grant date fair value of equity-based awards granted during 2009, 2008 and 2007 was $3.51, $4.85 and $12.74, respectively. Equity-based awards are generally expensed on a straight-line basis over a two to three year vesting period. Refer to Note 12 to our consolidated financial statements, included elsewhere herein, for additional information on equity-based award grant activity for the periods presented.

Research, Consulting and Other Expenses - Business Development. Research, consulting and other expenses include third-party business development related research, development, consulting, and other costs incurred in connection with business development activities. These costs fluctuate period to period based on business development related activities in each period.

Other

At December 31, 2009, the par value of auction rate securities collateralized by student loan portfolios totaled $2.7 million. As a result of the liquidity issues associated with the failed auctions as described at Note 7 to the consolidated financial statements included in this report, we estimate that the fair value of these auction rate securities no longer approximates their par value. Due to the estimate that the market for these student loan collateralized instruments may take in excess of twelve months to fully recover, we have classified these investments as noncurrent in the accompanying consolidated balance sheets. In addition, we recorded an other-than-temporary loss on our student loan collateralized auction rate securities of $296,000 and $263,000 in the accompanying consolidated statements of operations for the years ended December 31, 2009 and 2008, respectively. As a result of partial redemptions at par on certain of our auction rate securities collateralized by student loan portfolios, we recorded realized gains totaling $13,000 and $13,000 for 2009 and 2008, respectively, reflecting a partial recovery of the other-than-temporary loss originally recorded on these securities. Refer to Note 7 to our consolidated financial statements elsewhere herein for information on the valuation of auction rate securities held as of December 31, 2009. As of December 31, 2009, the net other-than-temporary loss on auction rate securities collateralized by student loan portfolios totaled $533,000.

At December 31, 2008, we also held auction rate securities with a par value totaling $975,000, issued by high credit quality closed-end investment companies. We recorded an other-than-temporary loss on our auction rate securities issued by closed-end investment companies of $236,000 in the accompanying consolidated statement of operations for the year ended December 31, 2008. As of December 31, 2009, all of the auction rate securities issued by closed-end investment companies were redeemed at par. As a result, we recorded realized gains totaling $236,000 in the accompanying consolidated statement of operations for the year ended December 31, 2009, reflecting a recovery of the other-than-temporary loss originally recorded on these securities.

Discontinued Operations – Split-Off of CombiMatrix Corporation

On August 15, 2007, CombiMatrix was split-off from us through the redemption of all outstanding shares of Acacia Research-CombiMatrix common stock in exchange for the distribution of new shares of CombiMatrix, on a pro-rata basis, to the holders of Acacia Research-CombiMatrix stock as of the Redemption Date. Subsequent to the Redemption Date, we no longer own any equity interests in CombiMatrix and the CombiMatrix group is no longer one of our business groups.

As a result of the Split-Off Transaction, the assets, liabilities, results of operations and cash flows of CombiMatrix have been eliminated from our continuing operations and we do not have any continuing involvement in the operations of CombiMatrix. As a result of the Split-Off Transaction, we have disposed of our investment in CombiMatrix, and therefore, our accompanying consolidated financial statements for all applicable historical periods presented reflect the assets, liabilities, results of operations and cash flows for CombiMatrix as “Discontinued Operations.” CombiMatrix was previously presented as a separate operating segment.

The Split-Off Transaction was accounted for by us at historical cost. Accordingly, no gain or loss on disposal was recognized in the 2007 consolidated statement of operations. Included in the consolidated statement of stockholder’s equity for the year ended December 31, 2007 is a charge to consolidated stockholders’ equity totaling $35,444,000, reflecting the distribution of our investment in the net assets of CombiMatrix to holders of Acacia Research-CombiMatrix stock, as of the Redemption Date. We received a private letter ruling from the IRS with regard to the U.S. federal income tax consequences of the Split-Off Transaction to the effect that the Split-Off Transaction will be treated as a tax-free exchange under Sections 368 and 355 of the Code.

Refer to Note 11 to our consolidated financial statements included elsewhere herein for information regarding the revenues and pretax loss included in discontinued operations for the applicable historical periods presented.

Inflation

Inflation has not had a significant impact on us or any of our subsidiaries in the current or prior periods.

Liquidity and Capital Resources

General

Our primary sources of liquidity are cash and cash equivalents and investments, as well as cash generated from operations. Our management believes that the cash and cash equivalent balances, investments, anticipated cash flow from operations and other external sources of available credit, will be sufficient to meet our cash requirements through at least March 2011 and for the foreseeable future. We may however encounter unforeseen difficulties that may deplete our capital resources more rapidly than anticipated, including those set forth under Item 1A. “Risk Factors” above. Any efforts to seek additional funding could be made through equity, debt or other external financing. However, additional funding may not be available on favorable terms, or at all. The capital and credit markets have been experiencing extreme volatility and disruption for more than 12 months. Recently, the volatility and disruption have reached unprecedented levels. In several cases, the markets have exerted downward pressure on stock prices and credit capacity for certain issuers, and there can be no assurance that the commercial paper markets will be a reliable source of short-term financing for us. If we fail to obtain additional funding when needed, we may not be able to execute our business plans and our business may suffer.

Cash and Cash Equivalents and Investments

Our consolidated cash and cash equivalents and investments totaled $53.9 million at December 31, 2009, compared to $51.5 million at December 31, 2008. The net change in cash and cash equivalents and investments related to continuing operations for 2009, 2008 and 2007 was comprised of the following (in thousands):

	2009			2008		2007
Net cash provided by (used in) continuing operations:
Operating activities	$	16,145		$	2,598	$	5,166
Investing activities		(8,652	)		5,070		(2,145	)
Financing activities		(4,010	)		142		5,014

Cash Flows from Operating Activities. Cash receipts from licensees totaled $70.9 million, $42.1 million and $51.4 million for 2009, 2008 and 2007, respectively. The fluctuations in cash receipts for the periods presented primarily reflects the corresponding fluctuations in license fee revenues recognized during the same periods, as described above. Cash outflows from operations totaled $54.8 million, $39.5 million and $46.2 million for 2009, 2008 and 2007, respectively. The fluctuations in cash outflows for the periods presented reflect the net increase in license fee revenue related inventor royalties and contingent legal fees and other operating costs and expenses during the same periods, as discussed above, and the impact of the timing of payments to inventors, attorneys and other vendors.

Cash Flows from Investing Activities. The change in net cash flows used in investing activities was primarily due to the impact of patent portfolio acquisitions and net sales of available-for-sale investments in connection with ongoing short-term cash management activities during the periods presented. Certain of our operating subsidiaries incurred patent acquisition costs totaling $9.6 million, $2.1 million and $3.8 million in 2009, 2008 and 2007, respectively. Refer to the “Overview” section above for a discussion of patent acquisition activities for the periods presented. Net sales of short-term investments totaled $1.0 million, $7.2 million and $1.8 million in 2009, 2008 and 2007, respectively.

Cash Flows from Financing Activities. In May 2009, our board of directors approved a restricted stock vesting net issuance program. Under the program, upon the vesting of unvested shares of restricted common stock, we withheld from fully vested shares of common stock otherwise deliverable to any employee-participant in our equity compensation programs, a number of whole shares of common stock having a fair market value (as determined by us as of the date of vesting) equal to the amount of tax required to be withheld by law, in order to satisfy the tax withholding obligations of ours in connection with the vesting of such shares. Of a total of 580,600 shares of restricted stock vesting between June 2009 and September 2009, 174,628 shares of common stock were withheld by us, in satisfaction of $1.1 million in required withholding tax liability. Consolidated net cash inflows from financing activities in 2009, 2008 and 2007 included stock option exercise proceeds of $247,000, $142,000, and $5.0 million, respectively.

Working Capital

The primary components of working capital are cash and cash equivalents, accounts receivable, prepaid expenses, accounts payable, accrued expenses, royalties and contingent legal fees payable and deferred revenues. Working capital at December 31, 2009 was $36.0 million, compared to $42.6 million at December 31, 2008. Refer to “Liquidity and Capital Resources - Cash and Investments” above for a discussion of the impact of activities related to cash and investments on working capital for the periods presented.

Consolidated accounts receivable from licensees decreased to $5.1 million at December 31, 2009, compared to $7.4 million at December 31, 2008. Accounts receivable balances fluctuate based on the timing, magnitude and payment terms associated with license agreements executed during the period, and the timing of cash receipts on accounts receivable balances recorded in previous periods. Two licensees individually represented approximately 78% and 10% of accounts receivable at December 31, 2009. Three licensees individually represented approximately 27%, 24% and 19% of accounts receivable at December 31, 2008.

Consolidated royalties and contingent legal fees payable increased to $12.4 million at December 31, 2009, compared to $10.8 million at December 31, 2008. Royalties and contingent legal fees payable balances fluctuate based on the magnitude and timing of the execution of related license agreements, the timing of cash receipts for the related license agreements, and the timing of payment of current and prior period royalties and contingent legal fees payable to inventor and outside attorneys, respectively.

The majority of accounts receivable from licensees at December 31, 2009 were collected or scheduled to be collected in the first quarter of 2010, in accordance with the terms of the related underlying license agreements. The majority of royalties and contingent legal fees payable are scheduled to be paid in the first quarter of 2010, upon receipt by us of the related license fee payments from licensees, in accordance with the underlying contractual arrangements.

Accounts payable and accrued expenses increased to $8.0 million at December 31, 2009, from $3.2 million at December 31, 2008, due primarily to the increase in litigation and licensing expenses-patents described above and the related timing of payments to attorneys and other vendors.

Deferred revenues, representing cash payments received from licensees prior to all of the required revenue recognition criteria described above being met, totaled $1.5 million at December 31, 2009 compared to $318,000 at December 31, 2008. Amounts recorded as deferred revenues are non-refundable.

Off-Balance Sheet Arrangements

We have not entered into off-balance sheet financing arrangements, other than operating leases.

Contractual Obligations

We have no significant commitments for capital expenditures in 2010. We have no committed lines of credit or other committed funding or long-term debt. The following table lists our material known future cash commitments as of December 31, 2009, and any material known commitments arising from events subsequent to year end:

	Payments Due by Period (In thousands)
Contractual Obligations	Total		Less than 1 year		1-3 years		More than 3 years
Operating leases	$	2,010	$	869	$	1,141	$	-
Total contractual obligations	$	2,010	$	869	$	1,141	$	-

Uncertain Tax Positions. As of December 31, 2009, the liability for uncertain tax positions, associated primarily with state income taxes, totaled $85,000, of which none is expected to be paid within one year. The liability for uncertain tax positions is recorded in other long-term liabilities in the consolidated balance sheet.

Recent Accounting Pronouncements

Refer to Note 2 to our consolidated financial statements included elsewhere herein.

Item 7A.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The primary objective of our investment activities is to preserve principal while concurrently maximizing the income we receive from our investments without significantly increasing risk. Some of the securities that we may invest in may be subject to market risk. This means that a change in prevailing interest rates may cause the principal amount of the investment to fluctuate. For example, if we hold a security that was issued with a fixed interest rate at the then-prevailing rate and the prevailing interest rate later rises, the current value of the principal amount of our investment will decline. To minimize this risk in the future, we intend to maintain our portfolio of cash equivalents and short-term investments in a variety of securities, including commercial paper, money market funds, high-grade corporate bonds, government and non-government debt securities and certificates of deposit. In general, money market funds are not subject to market risk because the interest paid on such funds fluctuates with the prevailing interest rate. As of December 31, 2009, all of our investments were in money market funds that invest in U.S. Treasury securities and obligations issued or guaranteed by the U.S. Government and certain auction rate securities. A hypothetical 100 basis point increase in interest rates would not have a material impact on the fair value of our available-for-sale securities as of December 31, 2009. Refer to Item 1A. “Risk Factors,” Item 7. “Liquidity and Capital Resources,” and Notes 2 and 3 to our consolidated financial statements included in this report for additional information. Refer to Note 7 to our consolidated financial statements elsewhere herein for information on auction rate securities held as of December 31, 2009.

Item 8.

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The financial statements and related financial information required to be filed hereunder are indexed under Item 15 of this report and are incorporated herein by reference.

Item 9.

CHANGES IN AND DISAGREEMENTS WITH INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

Item 9A.

CONTROLS AND PROCEDURES

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of our disclosure controls and procedures, as such term is defined under Rule 13a-15(e) and 15d-15(e) promulgated under the Securities Exchange Act of 1934, as amended, or the Exchange Act. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 2009, our disclosure controls and procedures were effective to ensure that the information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to management, including our chief executive officer and chief financial officer, to allow timely decisions regarding required disclosure, and that such information is recorded, processed, summarized and reported within the time periods prescribed by the SEC.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f) or 15d-15(f). Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation under the framework in Internal Control - Integrated Framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2009.

Grant Thornton, LLP, the independent registered public accounting firm who audited our consolidated financial statements included in this Annual Report on Form 10-K, has issued a report on our internal control over financial reporting, which is included herein.

There were no changes in our internal control over financial reporting during the fourth fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 9B.

OTHER INFORMATION

None

PART III

Item 10.

DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Except as provided below, the information required by this Item is incorporated herein by reference to our definitive proxy statement to be filed with the SEC no later than April 30, 2010.

Code of Conduct.

We have adopted a Code of Conduct that applies to all employees, including our chief executive officer, chief financial and accounting officer, president and any persons performing similar functions. Our Code of Conduct is provided on our internet website at www.acaciaresearch.com.

Item 11.

EXECUTIVE COMPENSATION

In accordance with Instruction G(3) to Form 10-K, the information required by this Item is incorporated herein by reference to our definitive proxy statement to be filed with the SEC no later than April 30, 2010.

Item 12.

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

Item 13.

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

Item 14.

PRINCIPAL ACCOUNTING FEES AND SERVICES

PART IV

Item 15.

EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a)

The following documents are filed as part of this report.

(1) Financial Statements	Page

Acacia Research Corporation Consolidated Financial Statements
Reports of Independent Registered Public Accounting Firm	F-1
Consolidated Balance Sheets as of December 31, 2009 and 2008	F-3
Consolidated Statements of Operations for the Years Ended December 31, 2009, 2008 and 2007	F-4
Consolidated Statements of Stockholders’ Equity for the Years Ended December 31, 2009, 2008 and 2007	F-5
Consolidated Statements of Cash Flows for the Years Ended December 31, 2009, 2008 and 2007	F-6
Notes to Consolidated Financial Statements	F-7

(2) Financial Statement Schedules

Financial statement schedules are omitted because they are not applicable or the required information is shown in the Financial Statements or the Notes thereto.

(3) Exhibits

Refer to Item 15(b) below.

(b)

Exhibits. The following exhibits are either filed herewith or incorporated herein by reference:

Exhibit Number	Description

2.1	Agreement and Plan of Merger of Acacia Research Corporation, a California corporation, and Acacia Research Corporation, a Delaware corporation, dated as of December 23, 1999 (1)
2.2	Agreement and Plan of Reorganization by and among Acacia Research Corporation, Combi Acquisition Corp. and CombiMatrix Corporation dated as of March 20, 2002 (2)
3.1	Amended and Restated Certificate of Incorporation (3)
3.2	Amended and Restated Bylaws (13)
3.2.1	Amendment to Amended and Restated Bylaws (14)
10.1*	Acacia Research Corporation 1996 Stock Option Plan, as amended (4)
10.2*	Form of Option Agreement constituting the Acacia Research Corporation 1996 Executive Stock Bonus Plan (5)
10.3*	2002 Acacia Technologies Stock Incentive Plan (6)
10.4*	2007 Acacia Technologies Stock Incentive Plan (7)
10.5*	Form of Acacia Technologies Stock Option Agreement for the 2007 Acacia Technologies Stock Incentive Plan (8)
10.6*	Form of Acacia Technologies Stock Issuance Agreement for the 2002 Acacia Technologies Stock Incentive Plan (8)
10.7*	Form of Acacia Technologies Stock Issuance Agreement for the 2007 Acacia Technologies Stock Incentive Plan (8)
10.8	Lease Agreement dated January 28, 2002, between Acacia Research Corporation and The Irvine Company (9)
10.10	Form of Indemnification Agreement (10)
10.11	Form of Subscription Agreement between Acacia Research Corporation and certain investors (11)
10.12	Third Amendment to lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (12)
10.19*	Employment Agreement, dated January 28, 2005, by and between Acacia Technologies Services Corporation, and Dooyong Lee, as amended (13)

10.19.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Dooyong Lee (16)
10.20*	Employment Agreement, dated April 12, 2004, by and between Acacia Media Technologies Corporation and Edward Treska (13)
10.20.1*	Addendum to Employment Agreement with Edward Treska, dated March 31, 2008 (15)
10.21	Fourth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (13)
10.22	Fifth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (13)
10.23*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Paul Ryan (15)
10.23.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Paul Ryan (16)
10.24*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (15)
10.24.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (16)
10.25*	Amended Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (15)
10.25.1*	Amendment to Amended Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (16)
10.26*	Amended Acacia Research Corporation Executive Severance Policy (16)
18.1	Preferability Letter dated February 25, 2010 from Grant Thornton LLP, Acacia Research Corporation’s registered independent accounting firm, regarding change in accounting principle
21.1	List of Subsidiaries
23.1	Consent of Independent Registered Public Accounting Firm
24.1	Power of Attorney (included in the signature page hereto).
31.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
31.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
32.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350
32.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350

___________________________

*	The referenced exhibit is a management contract, compensatory plan or arrangement.

(1)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on December 30, 1999 (SEC File No. 000-26068).

(2)	Incorporated by reference to Appendix A to the Proxy Statement/Prospectus which formed part of Acacia Research Corporation’s Registration Statement on Form S-4 (SEC File No. 333-87654) which became effective on November 8, 2002.

(3)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on June 5, 2008 (SEC File No. 000-26068).

(4)	Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 10, 2000 (SEC File No. 000-26068).

(5)	Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 26, 1996 (SEC File No. 000-26068).

(6)	Incorporated by reference to Appendix E to the Proxy Statement/Prospectus which formed part of Acacia Research Corporation’s Registration Statement on Form S-4 (SEC File No. 333-87654) which became effective on November 8, 2002.

(7)	Incorporated by reference to Acacia Research Corporation’s Registration Statement on Form S-8 (SEC File No. 333-144754) which became effective on July 20, 2007.

(8)	Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended September 30, 2007, filed on November 2, 2007 (SEC File No. 000-26068).

(9)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2001, filed on March 27, 2002 (SEC File No. 000-26068).

(10)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2002, filed on March 27, 2003 (SEC File No. 000-26068).

(11)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on September 19, 2005 (SEC File No. 000-26068).

(12)	Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended March 31, 2006, filed on May 10, 2006 (SEC File No. 000-26068).

(13)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2007, filed on March 14, 2008 (File No. 000-26068).

(14)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on January 7, 2008 (File No. 000-26068).

(15)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on April 2, 2008 (SEC File No. 000-26068).

(16)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2008, filed on February 26, 2009 (File No. 000-26068).

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ACACIA RESEARCH CORPORATION

Dated: February 25, 2010	By:	/s/ Paul R. Ryan
		Paul R. Ryan
		Chairman of the Board and Chief Executive Officer (Authorized Signatory)

POWER OF ATTORNEY

We, the undersigned directors and officers of Acacia Research Corporation, do hereby constitute and appoint Paul R. Ryan and Clayton J. Haynes, and each of them, as our true and lawful attorneys-in-fact and agents with power of substitution, to do any and all acts and things in our name and behalf in our capacities as directors and officers and to execute any and all instruments for us and in our names in the capacities indicated below, which said attorney-in-fact and agent may deem necessary or advisable to enable said corporation to comply with the Securities Exchange Act of 1934, as amended, and any rules, regulations and requirements of the Securities and Exchange Commission, in connection with this Annual Report on Form 10-K, including specifically but without limitation, power and authority to sign for us or any of us in our names in the capacities indicated below, any and all amendments hereto; and we do hereby ratify and confirm all that said attorney-in-fact and agent, shall do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities and Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and the capacities and on the dates indicated.

Signature		Title	Date

/s/	Paul R. Ryan	Chairman of the Board and	February 25, 2010
	Paul R. Ryan	Chief Executive Officer
		(Principal Chief Executive)

/s/	Robert L. Harris, II	Director and President	February 25, 2010
	Robert L. Harris, II

/s/	Clayton J. Haynes	Chief Financial Officer and Treasurer	February 25, 2010
	Clayton J. Haynes	(Principal Financial and Accounting Officer)

/s/	Fred A. de Boom	Director	February 25, 2010
	Fred A. de Boom

/s/	Edward W. Frykman	Director	February 25, 2010
	Edward W. Frykman

/s/	G. Louis Graziadio, III	Director	February 25, 2010
	G. Louis Graziadio, III

/s/	William S. Anderson	Director	February 25, 2010
	William S. Anderson

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders

Acacia Research Corporation

We have audited the accompanying consolidated balance sheets of Acacia Research Corporation (a Delaware corporation) as of December 31, 2009 and 2008, and the related consolidated statements of operations, stockholders’ equity, and cash flows for each for the three years in the period ended December 31, 2009. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Acacia Research Corporation as of December 31, 2009 and 2008, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2009 in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Acacia Research Corporation’s internal control over financial reporting as of December 31, 2009, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 25, 2010 expressed an unqualified opinion thereon.

As discussed in Note 8, the Company elected to change its method of accounting for term license agreements in 2009.

/s/ GRANT THORNTON LLP

Irvine, California

February 25, 2010

F-1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Board of Directors and Stockholders

Acacia Research Corporation

We have audited Acacia Research Corporation’s (a Delaware corporation) internal control over financial reporting as of December 31, 2009, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Acacia Research Corporation’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on Acacia Research Corporation’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Acacia Research Corporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2009, based on criteria established in Internal Control—Integrated Framework issued by COSO.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Acacia Research Corporation as of December 31, 2009 and 2008, and the related consolidated statements of operations, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2009 and our report dated February 25, 2010 expressed an unqualified opinion and contained an explanatory paragraph relating to the change in accounting method for term license agreements.

/s/ GRANT THORNTON LLP

Irvine, California

February 25, 2010

F-2

ACACIA RESEARCH CORPORATION

CONSOLIDATED BALANCE SHEETS

As of December 31, 2009 and 2008

(In thousands, except share and per share information)

	December 31,			December 31,
	2009			2008
ASSETS

Current assets:
Cash and cash equivalents	$	51,735		$	48,279
Accounts receivable		5,110			7,436
Prepaid expenses and other current assets		1,081			1,255
Total current assets		57,926			56,970

Property and equipment, net of accumulated depreciation		163			221
Patents, net of accumulated amortization		17,510			12,419
Investments - noncurrent		2,152			3,239
Other assets		505			225
	$	78,256		$	73,074

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
Accounts payable and accrued expenses	$	8,006		$	3,240
Royalties and contingent legal fees payable		12,402			10,770
Deferred revenues		1,510			318
Total current liabilities		21,918			14,328

Other liabilities		369			199
Total liabilities		22,287			14,527

Commitments and contingencies (Note 13)

Stockholders' equity:
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding		-			-
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 31,912,066 and 30,884,994 shares issued and outstanding as of December 31, 2009 and December 31, 2008, respectively		32			31
Additional paid-in capital		173,672			167,468
Accumulated deficit		(120,242	)		(108,952	)
Total Acacia Research Corporation stockholders' equity		53,462			58,547

Noncontrolling interests in operating subsidiary		2,507			-
Total stockholders' equity		55,969			58,547
	$	78,256		$	73,074

The accompanying notes are an integral part of these consolidated financial statements.

F-3

ACACIA RESEARCH CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

For the Years Ended December 31, 2009, 2008 and 2007

(In thousands, except share and per share information)

	2009			2008			2007

License fee revenues	$	67,340		$	48,227		$	52,597

Operating costs and expenses:
Cost of revenues:
Inventor royalties		15,673			14,995			12,050
Contingent legal fees		15,945			12,429			17,174
Litigation and licensing expenses - patents		14,055			6,900			7,799
Amortization of patents		4,634			6,043			5,583
Marketing, general and administrative expenses (including non-cash stock compensation expense of $7,065 for 2009, $7,355 for 2008 and $5,908 for 2007)		21,070			21,130			18,381
Research, consulting and other expenses - business development		1,689			933			886
Write-off of patent-related intangible asset		-			-			235
Total operating costs and expenses		73,066			62,430			62,108
Operating loss		(5,726	)		(14,203	)		(9,511	)

Other income (expense):
Interest income		148			1,056			2,359
Gain on foreign currency translation		201			-			-
Loss on investments		(47	)		(486	)		-
Total other income (expense)		302			570			2,359

Loss from continuing operations before provision for income taxes		(5,424	)		(13,633	)		(7,152	)
Provision for income taxes		(209	)		(124	)		(207	)
Net loss from continuing operations including noncontrolling interests in operating subsidiary		(5,633	)		(13,757	)		(7,359	)
Net income attributable to noncontrolling interests in operating subsidiary		(5,657	)		-			-
Net loss from continuing operations attributable to Acacia Research Corporation		(11,290	)		(13,757	)		(7,359	)
Discontinued operations:
Loss from discontinued operations - Split-off of CombiMatrix Corporation		-			-			(8,086	)
Net loss attributable to Acacia Research Corporation	$	(11,290	)	$	(13,757	)	$	(15,445	)


Loss per common share:
Acacia Research Corporation common stock:
Net loss	$	(11,290	)	$	(13,757	)	$	(7,359	)
Basic and diluted loss per share		(0.38	)		(0.47	)		(0.26	)

Acacia Research - CombiMatrix stock - Discontinued Operations - Split-off of CombiMatrix Corporation:
Loss from discontinued operations - Split-off of CombiMatrix Corporation		-			-		$	(8,086	)
Basic and diluted loss per share		-			-			(0.14	)

Weighted-average shares:
Acacia Research Corporation common stock:
Basic and diluted		29,914,801			29,423,998			28,503,314
Acacia Research - CombiMatrix stock:
Basic and diluted		-			-			55,862,707

The accompanying notes are an integral part of these consolidated financial statements.

F-4

ACACIA RESEARCH CORPORATION

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

For the Years Ended December 31, 2009, 2008 and 2007

(In thousands, except share information)



	AR-Acacia Technologies			AR-CombiMatrix			AR-Acacia Technologies		AR-CombiMatrix			Additional			Other						Noncontrolling Interests in
	Common			Common			Common		Common			Paid-in			Comprehensive			Accumulated			Operating
	Shares(1)			Shares(1)			Stock(1)		Stock(1)			Capital			Income (Loss)			Deficit			Subsidiary			Total

2007
Balance at December 31, 2006		28,231,701			50,365,810		$	28	$	50		$	326,599		$	2		$	(232,370	)	$	-		$	94,309
Activities related to continuing operations:
Net loss from continuing operations		-			-			-		-			-			-			(7,359	)		-			(7,359	)
Stock options exercised		1,062,513			-			1		-			5,013			-			-			-			5,014
Compensation expense relating to stock options and restricted stock awards		808,268			-			1		-			5,908			-			-			-			5,909
Unrealized loss on short-term investments		-			-			-		-			-			(21	)		-			-			(21	)
Other		-			-			-		-			-			-			(55	)		-			(55	)

Activities related to discontinued operations - Split-off of CombiMatrix Corporation:
Loss from discontinued operations - Split-off of CombiMatrix Corporation		-			-			-		-			-			-			(8,086	)		-			(8,086	)
Stock options and warrants exercised and units issued in direct offering, net offering costs		-			9,203,959			-		10			480			-			-			-			490
Compensation expense relating to stock options		-			-			-		-			726			-			-			-			726
Warrant liability		-			-			-		-			9,089			-			-			-			9,089
Stock issued to consultant		-			306,000			-		-			208			-			-			-			208
Unrealized gain on short-term investments		-			-			-		-			-			13			-			-			13
Other		-			-			-		-			11			-			-			-			11
Discontinued operations - Split-off of CombiMatrix Corporation		-			(59,875,769	)		-		(60	)		(188,062	)		3			152,675			-			(35,444	)
Balance at December 31, 2007		30,102,482			-			30		-			159,972			(3	)		(95,195	)		-			64,804

2008																						-
Net loss		-			-			-		-			-			-			(13,757	)		-			(13,757	)
Stock options exercised		38,079			-			-		-			142			-			-			-			142
Compensation expense relating to stock options and restricted stock awards		744,433			-			1		-			7,354			-			-			-			7,355
Unrealized gain on short-term investments		-			-			-		-			-			3			-			-			3
Balance at December 31, 2008		30,884,994			-			31		-			167,468			-			(108,952	)		-			58,547

2009
Net loss attributable to Acacia Research Corporation		-			-			-		-			-			-			(11,290	)		-			(11,290	)
Stock options exercised		94,700			-			-		-			247			-			-			-			247
Repurchased restricted common stock		(174,628	)		-			-		-			(1,107	)		-			-			-			(1,107	)
Compensation expense relating to stock options and restricted stock awards		1,107,000			-			1		-			7,064			-			-			-			7,065
Net income attributable to noncontrolling interests in operating subsidiary		-			-			-		-			-			-			-			5,657			5,657
Distributions of noncontrolling interests in operating subsidiary		-			-			-		-			-			-			-			(3,150	)		(3,150	)
Balance at December 31, 2009		31,912,066			-		$	32	$	-		$	173,672		$	-		$	(120,242	)	$	2,507		$	55,969

_______________________________________________________

1 – Prior to the Redemption date, Acacia’s AR-Acacia Technologies common stock and AR-CombiMatrix common stock were classified as redeemable in the consolidated statements of stockholder’s equity. As a result of the Split-Off Transaction and related redemption of all shares of AR-CombiMatrix common stock discussed at Note 11, and the amendment and restatement of Acacia’s Certificate of Incorporation discussed at Note 9, as of August 15, 2007, Acacia’s only class of stock authorized and issuable is its “common stock” and Acacia's common stock is no longer redeemable.

The accompanying notes are an integral part of these consolidated financial statements.

F-5

ACACIA RESEARCH CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

For the Years Ended December 31, 2009, 2008 and 2007

(In thousands)

	2009			2008			2007
Cash flows from operating activities:
Net loss including noncontrolling interests in operating subsidiary	$	(5,633	)	$	(13,757	)	$	(15,445	)
Adjustments to reconcile net loss to net cash provided by operating activities from continuing operations:
Discontinued operations - Split-off of CombiMatrix Corporation		-			-			8,086
Depreciation and amortization		4,759			6,174			5,702
Non-cash stock compensation		7,065			7,355			5,908
Write-off of patent-related intangible asset		-			-			235
Loss on investments		47			486			-
Other		-			6			112
Changes in assets and liabilities:
Accounts receivable		2,326			(6,027	)		(1,140	)
Prepaid expenses, deferred fees and other assets		(106	)		99			(193	)
Accounts payable and accrued expenses		4,863			(162	)		1,281
Royalties and contingent legal fees payable		1,632			8,427			659
Deferred revenues		1,192			(3	)		(39	)

Net cash provided by operating activities from continuing operations		16,145			2,598			5,166
Net cash provided by (used in) operating activities from discontinued operations		(27	)		2			(7,782	)
Net cash provided by (used in) operating activities		16,118			2,600			(2,616	)

Cash flows from investing activities:
Purchase of property and equipment		(67	)		(28	)		(223	)
Purchase of available-for-sale investments		-			(265	)		(13,035	)
Sale of available-for-sale investments		1,040			7,503			14,873
Business acquisition		-			-			-
Patent acquisition costs		(9,625	)		(2,140	)		(3,760	)

Net cash provided by (used in) investing activities from continuing operations		(8,652	)		5,070			(2,145	)
Net cash used in investing activities from discontinued operations		-			-			(5,199	)
Net cash provided by (used in) investing activities		(8,652	)		5,070			(7,344	)

Cash flows from financing activities:
Distributions of noncontrolling interests in operating subsidiary		(3,150	)		-			-
Repurchased restricted common stock		(1,107	)		-			-
Proceeds from the exercise of stock options		247			142			5,014

Net cash provided by (used in) financing activities from continuing operations		(4,010	)		142			5,014
Net cash provided by financing activities from discontinued operations		-			-			5,369
Net cash provided by (used in) financing activities		(4,010	)		142			10,383

Increase in cash and cash equivalents		3,456			7,812			423

Cash and cash equivalents, beginning (including cash and cash equivalents related to discontinued operations - split-off of CombiMatrix Corporation of $7,829 at December 31, 2006)		48,279			40,467			40,044

Cash and cash equivalents of continuing operations, ending	$	51,735		$	48,279		$	40,467

The accompanying notes are an integral part of these consolidated financial statements.

F-6

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. DESCRIPTION OF BUSINESS

Description of Business. As used herein, “Acacia” and the “Company” refer to Acacia Research Corporation and/or its wholly and majority-owned operating subsidiaries. All intellectual property acquisition, development, licensing and enforcement activities are conducted solely by certain of Acacia’s wholly and majority-owned operating subsidiaries.

Acacia’s operating subsidiaries acquire, develop, license and enforce patented technologies. Acacia’s operating subsidiaries generate license fee revenues and related cash flows from the granting of licenses for the use of patented technologies that its operating subsidiaries own or control. Acacia’s operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented technologies from unauthorized use, the generation of licensing revenue from users of their patented technologies and, if necessary, the enforcement against unauthorized users of their patented technologies. Currently, on a consolidated basis, Acacia’s operating subsidiaries own or control the rights to over 140 patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

CombiMatrix Group Split-Off Transaction and Related Discontinued Operations. In January 2006, Acacia’s board of directors approved a plan for its former wholly owned subsidiary, CombiMatrix Corporation (“CombiMatrix”), the primary component of Acacia’s life science business (the “CombiMatrix group”), to become an independent publicly-held company. On August 15, 2007 (the “Redemption Date”), CombiMatrix was split-off from Acacia through the redemption of all outstanding shares of Acacia Research-CombiMatrix common stock in exchange for the distribution of new shares of CombiMatrix common stock, on a pro-rata basis, to the holders of Acacia Research-CombiMatrix common stock on the Redemption Date (the “Split-Off Transaction”). On the Redemption Date, every ten (10) shares of Acacia Research-CombiMatrix common stock outstanding on August 15, 2007, was redeemed for one (1) share of common stock of CombiMatrix. Subsequent to the Redemption Date, Acacia no longer owns any equity interests in CombiMatrix and the CombiMatrix group is no longer a business group of Acacia. As a result of the Split-Off Transaction, Acacia’s only business is its intellectual property licensing business.

As a result of the Split-Off Transaction, Acacia disposed of its investment in CombiMatrix. Refer to Note 11 for information regarding presentation of the results of operations and cash flows for the CombiMatrix group as “Discontinued Operations” in the accompanying consolidated financial statements for all applicable historical periods presented.

Capital Structure. Pursuant to the Split-Off Transaction, all outstanding shares of Acacia Research-CombiMatrix common stock were redeemed, and hence, all rights of holders of Acacia Research-CombiMatrix common stock ceased as of the Redemption Date, except for the right, upon the surrender to the exchange agent of shares of Acacia Research-CombiMatrix common stock, to receive new shares of CombiMatrix common stock pursuant to the exchange ratio described above. Subsequent to the consummation of the Split-Off Transaction, Acacia’s only class of common stock outstanding is its common stock.

Prior to the Split-Off Transaction, Acacia had two classes of common stock outstanding, its Acacia Research-Acacia Technologies common stock (“AR-Acacia Technologies Stock”) and its Acacia Research-CombiMatrix common stock (“AR-CombiMatrix Stock”). AR-Acacia Technologies Stock was intended to reflect separately the performance of Acacia’s Acacia Technologies group. AR-CombiMatrix Stock was intended to reflect separately the performance of Acacia’s CombiMatrix group. Although the AR-Acacia Technologies Stock and the AR-CombiMatrix Stock were intended to reflect the performance of the different business groups, they were both classes of common stock of Acacia and were not stock issued by the respective groups.

Acacia was incorporated on January 25, 1993 under the laws of the State of California. In December 1999, it changed its state of incorporation from California to Delaware.

F-7

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Liquidity and Risks

Acacia’s management believes that Acacia’s consolidated cash and cash equivalents and investment balances, anticipated cash flow from operations and other external sources of available credit will be sufficient to meet Acacia’s cash requirements, on a consolidated basis, through at least March 2011. To date, Acacia has relied primarily upon selling equity securities and payments from its licensees to generate the funds needed to finance the implementation of its plans of operation for its operating subsidiaries.

There can be no assurance that Acacia will be able to implement its future plans. Failure by management to achieve its plans would have a material adverse effect on Acacia’s ability to achieve its intended business objectives. Acacia may be required to obtain additional financing. There can be no assurance that additional funding will be available on favorable terms, if at all. If Acacia fails to obtain additional funding when needed, it may not be able to execute its business plans and its businesses may suffer.

The timing of the receipt of revenues by Acacia’s operating subsidiaries are subject to certain risks and uncertainties, including:

market acceptance of its operating subsidiaries’ patented technologies and services;

business activities and financial results of its licensees;

technological advances that may make its patented technologies obsolete or less competitive;

increases in operating costs, including costs for legal services, engineering and research and personnel;

the availability and cost of capital; and

governmental regulation that may restrict Acacia’s business.

Acacia’s success also depends on its operating subsidiaries’ ability to protect their intellectual property. The Company’s operating subsidiaries rely on their proprietary rights and their protection. Although reasonable efforts will be taken to protect Acacia’s operating subsidiaries’ proprietary rights, the complexity of international trade secret, copyright, trademark and patent law, and common law, coupled with limited resources and the demands of quick delivery of technologies to market, create risk that these efforts will prove inadequate. Accordingly, if Acacia’s operating subsidiaries are unsuccessful with litigation to protect their intellectual property rights, the future consolidated revenues of Acacia could be adversely affected.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Accounting Principles and Fiscal Year End. The consolidated financial statements and accompanying notes are prepared on the accrual basis of accounting in accordance with generally accepted accounting principles in the United States of America. Acacia has a December 31 fiscal year end.

Principles of Consolidation. The accompanying consolidated financial statements include the accounts of Acacia and its wholly and majority-owned subsidiaries, which have been consolidated pursuant to Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, “Consolidation” (“ASC Topic 810”). Material intercompany transactions and balances have been eliminated in consolidation.

F-8

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

ASC Topic 810 establishes accounting and reporting standards requiring the identification of and distinction between ownership interests in subsidiaries held by the parent and ownership interests in subsidiaries held by the noncontrolling interest owners. ASC Topic 810 requires the noncontrolling interests in Acacia’s majority-owned operating subsidiary to be separately presented as a component of stockholders’ equity on the consolidated statement of financial position for the applicable periods presented. In addition, ASC Topic 810 requires that consolidated net income or loss be adjusted to include the net income or loss attributed to the noncontrolling interests in the majority-owned operating subsidiary on the consolidated statements of operations for the applicable periods presented. Refer to the accompanying consolidated balance sheet for noncontrolling interests in Acacia’s majority-owned operating subsidiary as of December 31, 2009 and the accompanying consolidated statement of operation for the year ended December 31, 2009 for the net income attributable to noncontrolling interests in Acacia’s majority-owned operating subsidiary.

Revenue Recognition. Acacia recognizes revenue in accordance with ASC Topic 605, “Revenue Recognition.” Revenue is recognized when (i) persuasive evidence of an arrangement exists, (ii) all obligations have been substantially performed pursuant to the terms of the license agreement, (iii) amounts are fixed or determinable and (iv) collectibility of amounts is reasonably assured.

Revenues generated from license agreements are recognized in the period earned, provided that amounts are fixed or determinable and collectibility is reasonably assured. Under the terms of Acacia’s license agreements, Acacia’s operating subsidiaries grant non-exclusive licenses for the use of patented technologies, which they own or control. In general, pursuant to the terms of the agreements with licensees, upon the grant of the licenses, Acacia has no further obligations with respect to the licenses granted. License fees paid to and recognized as revenue by Acacia’s subsidiaries are non-refundable.

Certain license agreements provide for the payment of contractually determined paid-up license fees in consideration for the grant of a non-exclusive, retroactive and future license to manufacture and/or sell products covered by patented technologies owned or controlled by Acacia’s operating subsidiaries. The licenses granted may be perpetual in nature, extending until the expiration of the related patents. In addition, the licenses granted may be granted for a defined, relatively short period of time, typically one-year periods, with the licensee possessing the right to renew the license at the end of each annual license term for an additional minimum upfront license fee payment. Generally, the execution of these license agreements also provide for the release of the licensee from certain claims and the dismissal of any pending litigation. Pursuant to the terms of these agreements, Acacia’s operating subsidiaries have no further obligation with respect to the grant of the non-exclusive retroactive and future license and related releases, including no express or implied obligation on Acacia’s operating subsidiaries’ part to maintain or upgrade the technology, or provide future support or services. Generally, the agreements provide for the grant of the license and releases upon execution of the agreement, or upon receipt of the minimum annual upfront license fee payment for annual term license agreement renewals. As such, the earnings process is complete and revenue is recognized upon the execution of the agreement, when collectibility is reasonably assured, or upon receipt of the minimum annual upfront license fee for term license agreement renewals, and when all other revenue recognition criteria have been met.

Certain of the agreements also provide for future royalties or additional required payments based on future licensee activities. Additional royalties are recognized in revenue upon resolution of the related contingency provided that all revenue recognition criteria, as described above have been met. Amounts of additional royalties due under these license agreements, if any, cannot be reasonably estimated by management.

Certain license agreements provide for the calculation of license fees based on a licensee’s actual quarterly sales or actual per unit activity, applied to a contractual royalty rate. Licensees that pay license fees on a quarterly basis generally report actual quarterly sales or actual per unit activity information and related quarterly license fees due within 30 to 45 days after the end of the quarter in which such sales or activity takes place. The amount of license fees due under these license agreements each quarter cannot be reasonably estimated by management. Consequently, Acacia’s operating subsidiaries recognize revenue from these licensing agreements on a three-month lag basis, in the quarter following the quarter of sales or per unit activity, provided amounts are fixed or determinable and collectibility is reasonably assured. The lag method described above allows for the receipt of licensee royalty reports prior to the recognition of revenue.

F-9

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

License fee payments received that do not meet the revenue recognition criteria described above are deferred until the revenue recognition criteria are met.

Acacia assesses the collectibility of license fees receivable based on a number of factors, including past transaction history and credit-worthiness of licensees. If it is determined that collection is not reasonably assured, the fee is recognized when collectibility becomes reasonably assured, assuming all other revenue recognition criteria have been met, which is generally upon receipt of cash.

Cost of Revenues. Cost of revenues include the costs and expenses incurred in connection with Acacia’s patent licensing and enforcement activities, including inventor royalties paid to original patent owners, contingent legal fees paid to external patent counsel, litigation and licensing expense – patents, which includes patent-related legal expenses paid to external patent counsel, licensing and enforcement related research, consulting and other expenses paid to third parties, and the amortization of patent-related acquisition costs. These costs are included under the caption “Cost of revenues” in the accompanying consolidated statements of operations. Refer to Note 13 for additional information regarding inventor royalties expenses and contingent legal fee expenses.

Reclassifications. Certain operating costs and expenses previously reported for the years ended December 31, 2008 and 2007 have been reclassified to conform with the current period presentation, as follows:

	As Reported					Revised		As Reported					Revised
	2008		Reclass			2008		2007		Reclass			2007

Operating costs and expenses:
Cost of revenues:
Inventor royalties and contingent legal fees expense - patents		27,424		(27,424	)		-		29,224		(29,224	)		-
Inventor royalties				14,995			14,995				12,050			12,050
Contingent legal fees				12,429			12,429				17,174			17,174
Legal expenses - patents		4,949		(4,949	)		-		7,024		(7,024	)		-
Litigation and licensing expenses - patents		-		6,900			6,900		-		7,799			7,799
Marketing, general and administrative expenses (including non-cash stock compensation expense)		24,014		(2,884	)		21,130		20,042		(1,661	)		18,381
Research, consulting and other expenses - business development		-		933			933		-		886			886

Fair Value Measurements. ASC Topic 820, “Fair Value Measurements and Disclosures” (“ASC Topic 820”), establishes a common definition for fair value to be applied to U.S. generally accepted accounting principles guidance requiring use of fair value, establishes a framework for measuring fair value, and expands disclosure about such fair value measurements. This statement applies whenever other accounting pronouncements require or permit fair value measurements.

F-10

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

ASC Topic 820 defines fair value as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. ASC Topic 820 also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available. ASC Topic 820 established a three-level hierarchy of valuation techniques used to measure fair value, defined as follows:

	●	Level 1 - Observable Inputs: Quoted prices in active markets for identical investments;
	●	Level 2 - Pricing Models with Significant Observable Inputs: Other significant observable inputs, including quoted prices for similar investments, interest rates, credit risk, etc.; and
	●	Level 3 - Unobservable Inputs: Significant unobservable inputs, including the entity’s own assumptions in determining the fair value of investments.

ASC Topic 820 requires the use of observable market inputs (quoted market prices) when measuring fair value and requires a Level 1 quoted price to be used to measure fair value whenever possible. Refer to Note 3 for a summary of marketable securities held as of December 31, 2009 and 2008. Refer to Note 7 for information on the determination of fair value for auction rate securities held as of December 31, 2009 and 2008.

Cash and Cash Equivalents. Acacia considers all highly liquid, short-term investments with original maturities of three months or less when purchased to be cash equivalents. For the periods presented, Acacia’s cash equivalents are comprised of investments in money market funds that invest in U.S. Treasury securities and obligations issued or guaranteed by the U.S. Government. Acacia’s cash equivalents are measured at fair value using quoted prices that represent Level 1 inputs under ASC Topic 820.

Investments in Marketable Securities. Acacia’s investments in marketable securities consist of auction rate securities. Investments in securities with original maturities of greater than three months and less than one year and other investments representing amounts that are available for current operations are classified as short-term investments. Investments are classified into categories in accordance with the provisions of ASC Topic 320, “Investments – Debt and Equity Securities” (“ASC Topic 320”). At December 31, 2009 and 2008, all of Acacia’s investments are classified as available-for-sale, which are reported at fair value, in accordance with ASC Topic 820, with related unrealized gains and losses in the value of such securities recorded as a separate component of comprehensive income (loss) in stockholders’ equity until realized. Realized and unrealized gains and losses are recorded based on the specific identification method. The cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity. Such amortization is included in interest income (expense). Interest on all securities are included in interest income. Refer to Note 7 for information on the fair value and classification of auction rate securities held as of December 31, 2009 and 2008.

Impairment of Marketable Securities. Acacia reviews impairments associated with its investments in marketable securities in accordance ASC Topic 320, which provides guidance on determining the classification of any impairment as “temporary” or “other-than-temporary.” For investments classified as available-for-sale, unrealized losses that are other than temporary are recognized in the consolidated statement of operations. An impairment is deemed other than temporary unless (a) Acacia has the ability and intent to hold an investment for a period of time sufficient for recovery of its carrying amount and (b) positive evidence indicating that the investment's carrying amount is recoverable within a reasonable period of time outweighs any evidence to the contrary. All available evidence, both positive and negative, is considered to determine whether, based on the weight of that evidence, the carrying amount of the investment is recoverable within a reasonable period of time. Refer to Note 7 for disclosures regarding investments in auction rate securities.

Concentration of Credit Risks. Financial instruments that potentially subject Acacia to concentrations of credit risk are cash equivalents, investments and accounts receivable. Acacia places its cash equivalents and investments primarily in highly rated money market funds and investment grade, marketable securities. Cash equivalents are also invested in deposits with certain financial institutions and may, at times, exceed federally insured limits. Acacia has not experienced any significant losses on its deposits of cash and cash equivalents.

F-11

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Two licensees accounted for 15% and 12% of the license fee revenues recognized during the year ended December 31, 2009. Two licensees accounted for 13% and 12% of the license fee revenues recognized during the year ended December 31, 2008. Two licensees accounted for 19% and 12% of the license fee revenues recognized during the year ended December 31, 2007. Two licensees represented approximately 78% and 10% of accounts receivable at December 31, 2009. Three licensees represented approximately 27%, 24% and 19% of accounts receivable at December 31, 2008.

Acacia performs regular credit evaluations of its licensees with significant receivable balances, if any, and has not experienced any significant credit losses. Accounts receivable are recorded at the executed contract amount and generally do not bear interest. Collateral is not required.

Property and Equipment. Property and equipment are recorded at cost. Major additions and improvements that materially extend useful lives of property and equipment are capitalized. Maintenance and repairs are charged against the results of operations as incurred. When these assets are sold or otherwise disposed of, the asset and related depreciation are relieved, and any gain or loss is included in the consolidated statements of operations for the period of sale or disposal. Depreciation is computed on a straight-line basis over the following estimated useful lives of the assets:

Furniture and fixtures	3 to 5 years
Computer hardware and software	3 to 5 years
Leasehold improvements	2 to 5 years (Lesser of lease term or useful life of improvement)

Rental payments on operating leases are charged to expense in the consolidated statements of operations on a straight-line basis over the lease term.

Organization Costs. Costs of start-up activities, including organization costs, are expensed as incurred.

Patents. Patents, once issued or purchased, are amortized on the straight-line method over their remaining economic useful lives, ranging from one to seven years.

Impairment of Long-lived Assets. Acacia reviews long-lived assets and intangible assets for potential impairment annually and when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. In the event the sum of the expected undiscounted future cash flows resulting from the use of the asset is less than the carrying amount of the asset, an impairment loss equal to the excess of the asset’s carrying value over its fair value is recorded. If an asset is determined to be impaired, the loss is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including a discounted value of estimated future cash flows.

Fair Value of Financial Instruments. The carrying value of cash and cash equivalents, accounts receivables, accounts payable and accrued expenses approximates their fair values due to their short-term maturities.

Stock-Based Compensation. ASC Topic 718, “Compensation – Stock Compensation” (“ASC Topic 718”) sets forth the accounting requirements for “share-based” compensation payments to employees and non-employee directors and requires that compensation cost relating to share-based payment transactions be recognized in the statement of operations. The compensation cost for all stock-based awards is measured at the grant date, based on the fair value of the award, and is recognized as an expense, on a straight-line basis, over the employee’s requisite service period (generally the vesting period of the equity award) which is generally two to four years.

F-12

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The fair value of each option award is estimated on the date of grant using a Black-Scholes option valuation model. The fair value of restricted stock and restricted stock unit awards is determined by the product of the number of shares or units granted and the grant date market price of the underlying common stock.

ASC Topic 718 requires stock-based compensation expense to be recorded only for those awards expected to vest using an estimated forfeiture rate. Acacia estimates pre-vesting option forfeitures at the time of grant and reflects the impact of estimated pre-vesting option forfeitures on compensation expense recognized. To the extent that actual results differ from Acacia’s estimates, such amounts are recorded as cumulative adjustments in the period the estimates are revised.

Acacia adopted ASC Topic 718 using the modified prospective transition method. Under this transition method, compensation cost recognized for the periods presented includes: (i) compensation cost for all stock-based awards granted prior to, but not yet vested as of January 1, 2006 (based on the grant-date fair value estimated in accordance with the original provisions of ASC Topic 718 and previously presented in the Company’s pro forma footnote disclosures), and (ii) compensation cost for all stock-based awards granted subsequent to January 1, 2006.

The fair value of stock options granted during the year ended December 31, 2007 were estimated using the Black-Scholes option-pricing model, assuming weighted-average risk free interest rate of 4.64%, expected term of 5.71 years and volatility of 68%, respectively. Due to a lack of sufficient historical share option exercise experience, the Company utilized the simplified method for estimating the expected term for stock options granted during the year ended December 31, 2007. Expected volatility is based on the historical volatility of the Company’s stock for the length of time corresponding to the expected term of the option. The risk-free interest rate is based on the U.S. treasury yield curve on the grant date for the expected term of the option. There were no stock options granted during the years ended December 31, 2009 and December 31, 2008. Refer to Note 12 for information on stock-based awards granted for the periods presented.

Acacia adopted the alternative transition method provided in ASC Topic 718. The alternative transition method includes a simplified method to establish the beginning balance of the additional paid-in-capital pool related to the tax effects of employee stock-based compensation which is available to absorb tax deficiencies recognized subsequent to the adoption of ASC Topic 718.

Income Taxes. Income taxes are accounted for using an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in Acacia’s consolidated financial statements or consolidated tax returns. A valuation allowance is established to reduce deferred tax assets if all, or some portion, of such assets will more than likely not be realized.

ASC Topic 740, “Income Taxes” (“ASC Topic 740”) provides guidance on the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return, and on derecognition, classification, interest and penalties, accounting in interim periods, disclosures, and transition. In accordance with ASC Topic 740, a tax position is a position in a previously filed tax return or a position expected to be taken in a future tax filing that is reflected in measuring current or deferred income tax assets and liabilities. Tax positions shall be recognized only when it is more likely than not (likelihood of greater than 50%), based on technical merits, that the position will be sustained upon examination. Tax positions that meet the more likely than not threshold should be measured using a probability weighted approach as the largest amount of tax benefit that is greater than 50% likely of being realized upon settlement.

The total amount of unrecognized tax benefits as of December 31, 2009, 2008 and 2007 was $85,000, $75,000 and $67,000, respectively, all of which, if recognized, would affect the effective tax rate.

Acacia recognizes interest and penalties with respect to unrecognized tax benefits in income tax expense. Acacia has identified no uncertain tax position for which it is reasonably possible that the total amount of unrecognized tax benefits will significantly increase or decrease within 12 months.

F-13

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Acacia is subject to taxation in the U.S. and various state jurisdictions. With no material exceptions, Acacia is no longer subject to U.S. federal or state examinations by tax authorities for years before 2003.

At December 31, 2009, Acacia had U.S. federal and state income tax net operating loss carryforwards as summarized at Note 10. Due to uncertainties surrounding Acacia’s ability to generate future taxable income to realize these assets, a full valuation allowance has been established to offset its net deferred tax assets. All net operating loss carryforwards (“NOLs”) and tax credits generated by the continuing operations of Acacia and its operating subsidiaries have been retained by Acacia subsequent to the Split-Off Transaction. Subsequent to the Split-Off Transaction, all NOLs and tax credits generated by CombiMatrix and its subsidiaries have been retained by CombiMatrix and are not available to Acacia.

Utilization of the NOL and research and development (“R&D”) credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations that may have occurred or that could occur in the future, as required by Section 382 of the Internal Revenue Code of 1986, as amended (the “Code”), as well as similar state provisions. These ownership changes may limit the amount of NOL and R&D credit carryforwards that can be utilized annually to offset future taxable income and tax, respectively. In general, an “ownership change” as defined by Section 382 of the Code results from a transaction or series of transactions over a three-year period resulting in an ownership change of more than 50 percentage points of the outstanding stock of a company by certain stockholders or public groups. Since Acacia’s formation, it has raised capital through the issuance of capital stock on several occasions (both before and after its public offering) which, combined with the purchasing stockholders’ subsequent disposition of those shares, may have resulted in such an ownership change, or could result in an ownership change in the future upon subsequent disposition.

Acacia has not completed a study to assess whether an ownership change has occurred or whether there have been multiple ownership changes since its formation due to the complexity and cost associated with such a study, and the fact that there may be additional such ownership changes in the future. If Acacia has experienced an ownership change at any time since its formation, utilization of the NOL or R&D credit carryforwards would be subject to an annual limitation under Section 382 of the Code, which is determined by first multiplying the value of Acacia’s stock at the time of the ownership change by the applicable long-term, tax-exempt rate, and then could be subject to additional adjustments, as required. Any limitation may result in expiration of a portion of the NOL or R&D credit carryforwards before utilization. Further, until a study is completed and any limitation known, no amounts are being considered as an uncertain tax position or disclosed as an unrecognized tax benefit under ASC Topic 740. Due to the existence of a full valuation allowance, future changes in Acacia’s unrecognized tax benefits will not impact its effective tax rate. Any carryforwards that will expire prior to utilization as a result of such limitations will be removed from deferred tax assets with a corresponding reduction of the valuation allowance.

Comprehensive Income (Loss). Comprehensive income (loss) is the change in equity from transactions and other events and circumstances other than those resulting from investments by owners and distributions to owners. Refer to Note 15.

Segment Reporting. Acacia uses the management approach, which designates the internal organization that is used by management for making operating decisions and assessing performance as the basis of Acacia’s reportable segments. Acacia’s intellectual property licensing and enforcement business constitutes its single reportable segment.

Use of Estimates. The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Acacia believes that, of the significant accounting policies described herein, the accounting policies associated with revenue recognition, stock-based compensation expense, valuation of long-lived and intangible assets and impairment of marketable securities, require its most difficult, subjective or complex judgments.

F-14

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Earnings (Loss) Per Share. Basic earnings per share for each class of common stock is computed by dividing the income or loss allocated to each class of common stock by the weighted-average number of outstanding shares of that class of common stock. Diluted earnings per share is computed by dividing the income or loss allocated to each class of common stock by the weighted-average number of outstanding shares of that class of common stock, including the dilutive effect of common stock equivalents. Potentially dilutive common stock equivalents primarily consist of employee stock options, unvested restricted stock, restricted stock units and common stock purchase warrants (AR-CombiMatrix stock only).

The earnings or losses allocated to each class of common stock are determined by Acacia’s board of directors. This determination is generally based on the net income or loss amounts of the corresponding group determined in accordance with accounting principles generally accepted in the United States of America, consistently applied. Acacia believes this method of allocation to be systematic and reasonable.

As a result of the Split-Off Transaction, earnings or losses allocated to the CombiMatrix group are presented as “Discontinued Operations” in the accompanying consolidated financial statements, for applicable periods. Subsequent to the Split-Off Transaction, Acacia’s only class of common stock outstanding is its Acacia Research common stock.

The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted loss per share:

	For the Year Ended December 31,
	2009		2008		2007
Acacia Research Corporation stock

Basic and diluted weighted-average number of common shares outstanding		29,914,801		29,423,998		28,503,314

All outstanding stock options, nonvested restricted stock and restricted stock units excluded from the computation of diluted loss per share because the effect of inclusion would have been anti-dilutive		5,144,960		4,928,986		5,884,934

Acacia Research - CombiMatrix stock - Discontinued Operations - Split-off of CombiMatrix Corporation(1)

Basic and diluted weighted-average number of common shares outstanding		-		-		55,862,707

Outstanding stock options excluded from the computation of diluted loss per share because the effect of inclusion would have been anti-dilutive		-		-		7,003,390

Warrants excluded from the computation of diluted loss per share because the option exercise price was greater than the average market price of the common shares		-		-		23,838,648

_____________________

(1)

Reflects activity and amounts outstanding as of the Redemption Date.

F-15

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Subsequent Events. In May 2009, the FASB issued a new accounting standard which established general accounting standards and disclosure for subsequent events. In accordance with this standard, Acacia evaluated subsequent events through February 25, 2010, the date we filed this Annual Report on Form 10-K with the Securities and Exchange Commission.

Recent Accounting Pronouncements. In January 2010, the FASB issued new accounting guidance related to the disclosure requirements for fair value measurements and provides clarification for existing disclosures requirements. This update will require (a) an entity to disclose separately the amounts of significant transfers in and out of Levels 1 and 2 fair value measurements and to describe the reasons for the transfers; and (b) information about purchases, sales, issuances and settlements to be presented separately (i.e. present the activity on a gross basis rather than net) in the reconciliation for fair value measurements using significant unobservable inputs (Level 3 inputs). This guidance clarifies existing disclosure requirements for the level of disaggregation used for classes of assets and liabilities measured at fair value and requires disclosures about the valuation techniques and inputs used to measure fair value for both recurring and nonrecurring fair value measurements using Level 2 and Level 3 inputs. The new disclosures and clarifications of existing disclosure are effective for fiscal years beginning after December 15, 2009, except for the disclosure requirements for related to the purchases, sales, issuances and settlements in the rollforward activity of Level 3 fair value measurements. Those disclosure requirements are effective for fiscal years ending after December 31, 2010. The Company does not believe the adoption of this guidance will have a material impact on its consolidated financial statements.

In October 2009, the FASB issued new accounting guidance related to the revenue recognition of multiple element arrangements. The new guidance states that if vendor specific objective evidence or third party evidence of fair value for deliverables in an arrangement cannot be determined, companies will be required to develop a best estimate of the selling price to separate deliverables and allocate arrangement consideration using the relative selling price method. The accounting guidance will be applied prospectively and will become effective during the first quarter of 2011. Early adoption is allowed. The Company is currently evaluating the impact of this accounting guidance on its consolidated financial statements.

In October 2009, the FASB issued new accounting guidance related to certain revenue arrangements that include software elements. Previously, companies that sold tangible products with “more than incidental” software were required to apply software revenue recognition guidance. This guidance often delayed revenue recognition for the delivery of the tangible product. Under the new guidance, tangible products that have software components that are “essential to the functionality” of the tangible product will be excluded from the software revenue recognition guidance. The new guidance is to be applied on a prospective basis for revenue arrangements entered into or materially modified in fiscal years beginning on or after June 15, 2010, with earlier application permitted. The adoption of this accounting guidance will not have an impact on Acacia’s consolidated financial statements.

In August 2009, the FASB issued Accounting Standards Update (“ASU”) No. 2009-05, “Fair Value Measurements and Disclosures (Topic 820) - Measuring Liabilities at Fair Value.” This update provides clarification for the fair value measurement of liabilities in circumstances in which a quoted price in an active market for an identical liability is not available. Acacia adopted this update effective October 1, 2009. The adoption of this update did not have a material effect on Acacia’s financial position, results of operations or cash flows.

In June 2009, the FASB issued new accounting guidance related to accounting for transfers of financial assets. The new guidance changes the accounting for securitizations and special-purpose entities and enhances disclosure requirements related to the transfers of financial assets, including securitization transactions, and the continuing risk exposures related to transferred financial assets. The new guidance also modifies the criteria which determines whether an entity should be consolidated. The accounting guidance will be effective for fiscal years beginning after November 15, 2009. The adoption of these standards will not have a material impact on Acacia’s consolidated financial statements and related disclosures.

In June 2009, the FASB issued new accounting guidance which amends the evaluation criteria to identify the primary beneficiary of a variable interest entity (“VIE”) and requires ongoing reassessment of whether an enterprise is the primary beneficiary of the VIE. The new guidance significantly changes the consolidation rules for VIEs including the consolidation of common structures, such as joint ventures, equity method investments and collaboration arrangements. The guidance is applicable to all new and existing VIEs. The provisions of this new accounting guidance is effective as of the beginning of the first annual reporting period after November 15, 2009 and will become effective for us beginning in the first quarter of 2010. Acacia does not expect the adoption of this accounting guidance to have a material impact on its consolidated financial statements and related disclosures.

F-16

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

3. INVESTMENTS

Investments at December 31, 2009 and 2008 consist of investments in auction rate securities, all of which are classified as available-for-sale, with fair values of $2,152,000 and $3,239,000, respectively, and amortized costs of $2,685,000 and $3,725,000, respectively. All of the Company’s investments in auction rate securities are classified as noncurrent for the periods presented. Contractual maturity dates range up to thirty-five years, or are perpetual, with reset dates every 7 to 63 days. Refer to Note 7 for information regarding gross unrealized gains and losses related to auction rate securities held for the periods presented. Refer to Note 2 and 7 for more information.

4. PROPERTY AND EQUIPMENT

Property and equipment consists of the following at December 31, 2009 and 2008 (in thousands):

	2009			2008

Furniture and fixtures	$	354		$	312
Computer hardware and software		450			427
Leasehold improvements		143			141
		947			880
Less: accumulated depreciation		(784	)		(659	)
	$	163		$	221

Depreciation expense was $125,000, $131,000 and $119,000 for the years ended December 31, 2009, 2008 and 2007, respectively.

5. ACCOUNTS PAYABLE AND ACCRUED EXPENSES

Accounts payable and accrued expenses consist of the following at December 31, 2009 and 2008 (in thousands):

	2009		2008

Accounts payable	$	381	$	208
Payroll and other employee benefits		783		509
Accrued vacation		481		431
Accrued legal expenses - patent		4,412		1,467
Accrued consulting and other professional fees		1,833		485
Other accrued liabilities		116		140
	$	8,006	$	3,240

F-17

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

6. PATENTS

Acacia’s only identifiable intangible assets are patents and patent rights, with estimated remaining economic useful lives up to seven years. The gross carrying amounts and accumulated amortization related to acquired intangible assets as of December 31, 2009 and 2008 are as follows (in thousands):

	2009			2008

Gross carrying amount - patents	$	43,317		$	33,592
Accumulated amortization - patents		(25,807	)		(21,173	)
Patents, net	$	17,510		$	12,419

The weighted-average remaining estimated economic useful life of Acacia’s patents is five years. Aggregate patent amortization expense was $4,634,000, $6,043,000 and $5,583,000 in 2009, 2008 and 2007, respectively. Annual aggregate amortization expense for each of the next five years through December 31, 2014 is estimated to be $4,946,000 in 2010, $4,043,000 in 2011, $2,340,000 in 2012, $2,105,000 in 2013 and $1,947,000 in 2014.

For the years ended December 31, 2009, 2008 and 2007, on a consolidated basis, Acacia’s operating subsidiaries incurred and capitalized patent acquisition costs totaling $9,625,000, $2,140,000 and $3,760,000, respectively, in connection with the acquisition of the rights to several additional patent portfolios. The patents and patent rights have estimated economic useful lives ranging from one to seven years and are being amortized over weighted-average economic useful lives of seven years for 2009 acquisitions, five years for 2008 acquisitions and seven years for 2007 acquisitions. At December 31, 2009 and 2008, all of Acacia’s acquired intangible assets were subject to amortization.

In December 2008, pursuant to the terms of the respective inventor agreement, management elected to terminate its rights to exclusively license a patent portfolio. As such, the economic useful life of the patent-related intangible asset was reduced, resulting in the acceleration of $1,094,000 of amortization expense for the patent-related intangible asset in December 2008.

7. FAIR VALUE MEASUREMENTS AND AUCTION RATE SECURITIES

As of December 31, 2009 and 2008, Acacia held investment grade auction rate securities with a par value totaling $2,685,000 and $3,725,000, respectively. During the periods presented, Acacia’s auction rate securities consisted of auction rate investments backed by student loans, issued under programs such as the Federal Family Education Loan Program and high credit quality securities issued by closed-end investment companies. Auction rate securities are classified as available-for-sale securities and reflected at fair value in accordance with the requirements of ASC Topic 820.

Historically, Acacia’s auction rate securities were recorded at cost, which approximated their fair market value due to their variable interest rates, which typically reset every 7 to 35 days, despite the long-term nature of their stated contractual maturities. The Dutch auction process that resets the applicable interest rate at predetermined calendar intervals is intended to provide liquidity to the holder of auction rate securities by matching buyers and sellers within a market context enabling the holder to gain immediate liquidity by selling such interests at par or rolling over their investment. If there is an imbalance between buyers and sellers, the risk of a failed auction exists. Due to current liquidity issues in the global credit and capital markets, these securities have continued to experience failed auctions since February 2008. In such case of a failure, the auction rate securities continue to pay interest at the maximum contractual rate in accordance with their terms; however, Acacia may not be able to access the par value of the invested funds until a future auction of these investments is successful, the security is called by the issuer, or a buyer is found outside of the auction process.

F-18

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

As a result of the failed auctions, there are no reliable current observable market prices available for these securities for purposes of establishing fair market value as of December 31, 2009 and 2008. As a result, the fair values of these securities were estimated utilizing an analysis of certain unobservable inputs and by reference to a discounted cash flow analysis as of December 31, 2009 and 2008. These analyses considered, among other items, the underlying structure of each security, the collateral underlying the security investments, the creditworthiness of the counterparty, the present value of future principal and contractual interest payments discounted at rates considered to be reflective of current market conditions, consideration of the probabilities of default, continued auction failure, or repurchase or redemption at par for each period, and estimates of the time period over which liquidity related issues will be resolved. Observable market data for instruments with similar characteristics to Acacia’s auction rate securities was also considered when possible.

At December 31, 2009 and 2008, the par value of auction rate securities collateralized by student loan portfolios totaled $2,685,000 and $2,750,000, respectively. As a result of the liquidity issues associated with the failed auctions, Acacia estimates that the fair value of these auction rate securities no longer approximates their par value. Due to the estimate that the market for these student loan collateralized instruments may take in excess of twelve months to fully recover, Acacia has classified these investments as noncurrent in the accompanying consolidated balance sheets, and, as a result of the analysis described above, recorded an other-than-temporary loss of $296,000 and $263,000 in the accompanying statements of operations for the years ended December 31, 2009 and December 31, 2008, respectively. As a result of partial redemptions at par on certain of these auction rate securities subsequent to June 30, 2008, Acacia recorded realized gains totaling $13,000 and $13,000 for 2009 and 2008, reflecting a partial recovery of the other-than-temporary loss originally recorded on these securities. As of December 31, 2009, the net other-than-temporary loss on auction rate securities collateralized by student loan portfolios totaled $533,000.

At December 31, 2009 and 2008, the par value of auction rate securities issued by closed-end investment companies totaled $0 and $975,000, respectively. As a result of the reduced liquidity associated with these securities as of December 31, 2008, Acacia recorded an other-than-temporary loss on these auction rate securities of $236,000 in the accompanying statements of operations for the year ended December 31, 2008, and classified these securities as noncurrent assets in the accompanying December 31, 2008 consolidated balance sheet. All of Acacia’s auction rate securities issued by closed-end investment companies were redeemed at par during 2009. As a result, Acacia recorded realized gains totaling $236,000, reflecting the full recovery of the other-than-temporary loss originally recorded on these securities.

Acacia will continue to monitor and evaluate its investments in auction rate securities for any further potential impairment in future periods. If it is determined that any future valuation adjustments are other-than-temporary, Acacia would record additional charges to earnings as appropriate.

Assets measured at fair value on a recurring basis subject to the disclosure requirements of ASC Topic 820 at December 31, 2009, were as follows (in thousands):

		Fair Value Measurements at Reporting Date Using:
	Balance at December 31,	Quoted Prices in Active Markets For Identical Assets	Significant Other Observable Inputs	Significant Unobservable Inputs
Description	2009	(Level 1)	(Level 2)	(Level 3)

Auction rate securities	$ 2,152	-	-	$ 2,152

As a result of the change in market conditions, during the first quarter of 2008, Acacia modified the valuation methodology for auction rate securities to include consideration of the factors discussed above and reference to a discounted cash flow analysis. Accordingly, these securities changed from Level 1 to Level 3 within the fair value hierarchy prescribed by ASC Topic 820 since the initial adoption of ASC Topic 820 effective January 1, 2008. The following table presents the assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as defined in ASC Topic 820 at December 31, 2009 and 2008 (in thousands):

F-19

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	2009			2008
Auction rate securities:
Beginning balance as of January 1	$	3,239		$	-
Transfers to Level 3		-			6,000
Total gains or (losses) (realized or unrealized):
Recognized (losses) included in earnings		(296	)		(499	)
Recognized gains included in earnings		249			13
Settlements (net)		(1,040	)		(2,275	)
Ending balance as of December 31	$	2,152		$	3,239

8. CHANGE IN ACCOUNTING POLICY

Effective October 1, 2009, the Company elected to change its method of accounting for its term license agreements to recognize revenue when delivery of the license has occurred, which is typically at the time of execution of the related license agreement, or upon receipt of the applicable minimum annual upfront renewal license fee payment, and when all other revenue recognition criteria have been met. Prior to the change in the Company’s method of accounting, license fees for term license agreements were deferred and amortized to revenue on a straight-line basis over the applicable contractual license term. The new method was adopted as it provides a consistent approach to accounting for all of the Company’s license arrangements with similar significant terms and conditions and more closely reflects the culmination of the earnings process associated with these revenue arrangements.

F-20

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The effect of the change in accounting policy on Acacia’s consolidated financial statement line items for the applicable interim periods during 2009 was as follows (in thousands, except per share data):

	As of and for the Three Months									As of and for the Three Months									As of and for the Three Months
	Ended March 31, 2009									Ended June 30, 2009									Ended September 30, 2009
	As Reported			As Adjusted			Effect of Change			As Reported			As Adjusted			Effect of Change			As Reported			As Adjusted			Effect of Change

Statement of Operations:
License fee revenues	$	12,650		$	16,957		$	4,307		$	15,031		$	14,356		$	(675	)	$	12,831		$	16,169		$	3,338
Inventor royalties		3,528			5,377			1,849			2,352			2,019			(333	)		3,010			4,673			1,663
Contingent legal fees		3,163			3,532			369			3,257			3,190			(67	)		3,470			3,799			329
Operating loss		(2,606	)		(517	)		2,089			(535	)		(810	)		(275	)		(3,923	)		(2,577	)		1,346
Net loss attributable to Acacia Research Corporation		(2,357	)		(268	)		2,089			(2,648	)		(2,923	)		(275	)		(4,775	)		(3,429	)		1,346
Basic and diluted loss per share		(0.08	)		(0.01	)		0.07			(0.09	)		(0.10	)		(0.01	)		(0.16	)		(0.11	)		0.04

Balance Sheet:
Deferred costs	$	2,219		$	-		$	(2,219	)	$	1,819		$	-		$	(1,819	)	$	3,811		$	-		$	(3,811	)
Total assets		78,529			76,310			(2,219	)		75,579			73,760			(1,819	)		76,074			72,263			(3,811	)
Deferred revenues		4,319			10			(4,309	)		3,644			10			(3,634	)		6,982			10			(6,972	)
Total liabilities		20,419			16,110			(4,309	)		16,873			13,239			(3,634	)		21,727			14,755			(6,972	)
Accumulated deficit		(111,309	)		(109,220	)		2,089			(113,957	)		(112,143	)		1,814			(118,732	)		(115,572	)		3,160
Total stockholders' equity		58,110			60,199			2,089			58,706			60,520			1,814			54,347			57,507			3,160

	For the Six Months								For the Nine Months
	Ended June 30, 2009								Ended September 30, 2009
	As Reported			As Adjusted			Effect of Change		As Reported			As Adjusted			Effect of Change
Statement of Operations:
License fee revenues	$	27,681		$	31,313		$	3,632	$	40,512		$	47,482		$	6,970
Inventor royalties		5,880			7,396			1,516		8,890			12,069			3,179
Contingent legal fees		6,420			6,722			302		9,890			10,521			631
Operating loss		(3,141	)		(1,327	)		1,814		(7,064	)		(3,904	)		3,160
Net loss attributable to Acacia Research Corporation		(5,005	)		(3,191	)		1,814		(9,780	)		(6,620	)		3,160
Basic and diluted loss per share		(0.17	)		(0.11	)		0.06		(0.33	)		(0.22	)		0.11

F-21

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

9. STOCKHOLDERS’ EQUITY

Capital Stock

In connection with the consummation of the Split-Off Transaction, on August 15, 2007, CombiMatrix was split-off from Acacia through the redemption of all outstanding shares of AR-CombiMatrix Stock in exchange for the distribution of new shares of CombiMatrix common stock. As a result of, and immediately following, the consummation of the Split-Off Transaction, Acacia’s only class of common stock outstanding was its AR-Acacia Technologies stock. On May 20, 2008, Acacia’s stockholders approved an amendment and restatement of Acacia’s Certificate of Incorporation to eliminate all references to the AR-CombiMatrix Stock and all provisions relating to the rights and obligations pursuant to the AR-CombiMatrix Stock. As a result of the amendment and restatement, the name of “Acacia Research-Acacia Technologies common stock” was changed to “common stock,” and it is the only class of common stock authorized and issuable as a single class of common stock.

Pursuant to Acacia’s Amended and Restated Certificate of Incorporation the authorized capital stock of Acacia consists of 100,000,000 shares of common stock, $0.001 par value, and 10,000,000 shares of preferred stock, $0.001 par value. Under the terms of the Amended and Restated Certificate of Incorporation, the board of directors may determine the rights, preferences and terms of Acacia’s authorized but unissued shares of preferred stock. Holders of common stock are entitled to one vote per share on all matters to be voted on by the stockholders, and to receive ratably such dividends, if any, as may be declared by the board of directors out of funds legally available therefore. Upon the liquidation, dissolution or winding up of Acacia, after payment or provision for payment of the debts and other liabilities and full preferential amounts to which holders of any preferred stock are entitled, the holders of common stock are entitled to share ratably in all assets of Acacia which are legally available for distribution. Holders of common stock have no preemptive, subscription, redemption or conversion rights.

Acacia’s board of directors, subject to state laws and limits in Acacia’s amended and restated certificate of incorporation, including those discussed above, are able to declare dividends on its common stock at its discretion. To date, Acacia has never paid or declared cash dividends on shares of its stock, nor does Acacia anticipate paying cash dividends on its common stock in the foreseeable future.

Repurchase of Restricted Common Stock

In May 2009, Acacia’s board of directors approved a restricted stock vesting net issuance program. Under the program, upon the vesting of unvested shares of restricted common stock, Acacia withheld from fully vested shares of common stock otherwise deliverable to any employee-participant in Acacia’s equity compensation programs, a number of whole shares of common stock having a fair market value (as determined by Acacia as of the date of vesting) equal to the amount of tax required to be withheld by law, in order to satisfy the tax withholding obligations of Acacia in connection with the vesting of such shares. Of a total of 580,600 shares of restricted stock vested between June 2009 and September 2009, 174,628 shares of common stock were withheld by Acacia, in satisfaction of $1,107,000 in required withholding tax liability.

F-22

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

10. INCOME TAXES

Acacia’s provision for income taxes consists of the following (in thousands):

	2009		2008		2007
Current:
U.S. Federal tax	$	-	$	-	$	-
State taxes		209		124		207
	$	209	$	124	$	207

The tax effects of temporary differences and carryforwards that give rise to significant portions of deferred assets and liabilities consist of the following at December 31, 2009 and 2008 (in thousands):

	2009			2008

Deferred tax assets:
Net operating loss and capital loss carryforwards and credits	$	28,629		$	27,207
Amortization and depreciation		5,879			4,405
Stock compensation		3,218			3,045
Write-off of investments		1,344			1,344
Accrued liabilities and other		374			413
State taxes		5			5
Deferred revenue		4			126

Total deferred tax assets		39,453			36,545

Less: valuation allowance		(39,410	)		(36,360	)

Net deferred tax assets, net of valuation allowance		43			185

Deferred tax liabilities:
Intangibles		(43	)		(185	)

Net deferred taxes	$	-		$	-

F-23

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

A reconciliation of the federal statutory income tax rate and the effective income tax rate is as follows:

	2009			2008			2007
Statutory federal tax rate		(34%	)		(34%	)		(34%	)
State income taxes, net of federal tax effect		4%			1%			3%
Noncontrolling interests in operating subsidiary		(40%	)		-			-
Equity compensation		1%			1%			1%
Non deductible permanent items		-			1%			1%
Capital loss carryforwards		-			5%			6%
Valuation allowance		73%			27%			26%
		4%			1%			3%

At December 31, 2009, Acacia has established a full valuation allowance against its net deferred tax assets, due to management’s determination that the criteria for recognition have not been met.

At December 31, 2009, Acacia had U.S. federal and state income tax NOLs totaling approximately $86,406,000 and $68,775,000, expiring between 2010 and 2029, and 2012 and 2019, respectively.

As of December 31, 2009, approximately $13,197,000 of the valuation allowance related to the tax benefits of stock option deductions included in Acacia’s NOLs. At such time as the valuation allowance is released, the benefit will be credited to additional paid-in capital.

11. ACCOUNTING FOR THE SPLIT-OFF OF COMBIMATRIX CORPORATION

On August 15, 2007 (the “Redemption Date”), CombiMatrix was split-off from Acacia through the redemption of all outstanding shares of AR-CombiMatrix Stock in exchange for the distribution of new shares of CombiMatrix common stock, on a pro-rata basis, to the holders of AR-CombiMatrix Stock as of the Redemption Date. On the Redemption Date, every ten (10) shares of AR-CombiMatrix Stock outstanding on August 15, 2007, was redeemed for one (1) share of common stock of CombiMatrix. Subsequent to the Redemption Date, Acacia no longer owns any equity interests in CombiMatrix and the two companies operate independently of each other.

As a result of the Split-Off Transaction, effective August 15, 2007, the CombiMatrix group is no longer a business group of Acacia and Acacia does not have any continuing involvement in the operations of CombiMatrix. In connection with the Split-Off Transaction, all outstanding shares of AR-CombiMatrix Stock were redeemed, and all rights of holders of AR-CombiMatrix Stock ceased as of the Redemption Date, except for the right, upon the surrender to the exchange agent of shares of AR-CombiMatrix Stock, to receive new shares of CombiMatrix common stock pursuant to the exchange ratio described above.

The Split-Off Transaction was accounted for by Acacia at historical cost. Accordingly, no gain or loss on disposal was recognized in the accompanying consolidated statement of operations for the year ended December 31, 2007. Included in the consolidated statement of stockholder’s equity for the year ended December 31, 2007 is a charge to consolidated shareholders’ equity totaling $35,444,000, reflecting the distribution of Acacia’s investment in the net assets of CombiMatrix to holders of AR-CombiMatrix Stock, as of the Redemption Date, as described above. Acacia received a private letter ruling from the IRS with regard to the U.S. federal income tax consequences of the Split-Off Transaction to the effect that the Split-Off Transaction will be treated as a tax-free exchange under Sections 368 and 355 of the Code.

F-24

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

As a result of the Split-Off Transaction, Acacia has disposed of its investment in CombiMatrix, and therefore, Acacia’s accompanying consolidated financial statements for the year ended December 31, 2007 reflects the results of operations and cash flows for CombiMatrix as “Discontinued Operations.” CombiMatrix was previously presented as a separate operating segment of Acacia.

For the period from January 1, 2007 through August 15, 2007, revenues and pre-tax loss related to CombiMatrix included in discontinued operations were $2,968,000 and $8,086,000, respectively. The net loss from discontinued operations for the year ended December 31, 2007 includes direct costs incurred in connection with the Split-Off Transaction, originally included in Acacia corporate accounts, totaling $136,000 for the year ended December 31, 2007.

12. STOCK-BASED INCENTIVE PLANS

The 2002 Acacia Technologies Stock Incentive Plan (“2002 Plan”) and the 2007 Acacia Technologies Stock Incentive Plan (“2007 Plan”) (collectively, the “Plans”) were approved by the stockholders of Acacia in December 2002 and May 2007, respectively. Both Plans allow grants of stock options, stock awards and performance shares with respect to Acacia common stock to eligible individuals, which generally includes directors, officers, employees and consultants. Except as noted below, the terms and provisions of the Plans are identical in all material respects.

Acacia’s compensation committee administers the discretionary option grant and stock issuance programs. The compensation committee determines which eligible individuals are to receive option grants or stock issuances under those programs, the time or times when the grants or issuances are to be made, the number of shares subject to each grant or issuance, the status of any granted option as either an incentive stock option or a non-statutory stock option under the federal tax laws, the vesting schedule to be in effect for the option grant or stock issuance and the maximum term for which any granted option is to remain outstanding. The exercise price of options is generally equal to the fair market value of Acacia’s common stock on the date of grant. Options generally begin to be exercisable six months to one year after grant and generally expire ten years after grant. Stock options generally vest over two to three years and restricted shares generally vest in full after two to three years (generally represents the requisite service period in accordance with ASC Topic 718).

Programs

The Plans provide for the following separate programs:

●

Discretionary Option Grant Program. Under the discretionary option grant program, Acacia’s compensation committee may grant (1) non-statutory options to purchase shares of common stock to eligible individuals in the employ or service of Acacia or its subsidiaries (including employees, non-employee board members and consultants) at an exercise price not less than 85% of the fair market value of those shares on the grant date and (2) incentive stock options to purchase shares of common stock to eligible employees at an exercise price not less than 100% of the fair market value of those shares on the grant date (not less than 110% of fair market value if such employee actually or constructively owns more than 10% of Acacia’s voting stock or the voting stock of any of its subsidiaries).

●

Stock Issuance Program. Under the stock issuance program, eligible individuals may be issued shares of common stock directly, upon the attainment of performance milestones or the completion of a specified period of service or as a bonus for past services. Under this program, the purchase price for the shares shall not be less than 100% of the fair market value of the shares on the date of issuance, and payment may be in the form of cash or past services rendered.

F-25

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

●

Automatic Option Grant Program (2002 Plan only). Under the automatic option grant program, option grants will automatically be made at periodic intervals to eligible non-employee members of Acacia’s board of directors to purchase shares of common stock at an exercise price equal to 100% of the fair market value of those shares on the grant date. Each individual who first becomes a non-employee board member at any time after the date of the adoption of the incentive plans by Acacia’s board of directors will automatically receive an option to purchase 20,000 shares of common stock on the date the individual joins the board of directors. In addition, on the first business day in each calendar year following the adoption of the incentive plans by Acacia’s board of directors, each non-employee board member then in office, including each of Acacia’s current non-employee board members who is then in office, will automatically be granted an option to purchase 15,000 shares of common stock, provided that the individual has served on the board of directors for at least six months.

Commencing in fiscal 2008, in lieu of the option grants described above, each non-employee director will receive restricted stock units for the number of shares determined by dividing the annual retainer by the closing price of Acacia’s common stock on the grant date, provided that such individual has served as a non-employee director for at least 6 months. In addition, as of May 2007, each new non-employee director will receive restricted stock units for the number of shares determined by dividing the annual board of directors retainer by the closing price of Acacia’s common stock on the commencement date.

Restricted stock units vest in a series of twelve quarterly installments over the three year period following the grant date, subject to immediate acceleration upon a change in control. Acacia will deliver shares corresponding to the vested restricted stock units within thirty (30) days after the first to occur of the following events: (i) the fifth (5th) anniversary of the grant date; or (ii) termination of the non-employee director’s service as a member of the Company’s Board of Directors. The non-employee directors do not have any rights, benefits or entitlements with respect to any shares unless and until the shares have been delivered.

The number of shares of common stock available for issuance under the 2002 Plan automatically increases on the first trading day of January each calendar year during the term of the Plan by an amount equal to three percent (3%) of the total number of shares of common stock outstanding on the last trading day in December of the immediately preceding calendar year, but in no event shall any such annual increase exceed 500,000 shares. The aggregate number of shares of common stock available for issuance under the 2002 Plan shall not exceed 20,000,000 shares. At December 31, 2009, there were 1,350,000 shares available for grant under the 2002 Plan.

The initial share reserve under the 2007 Plan was 560,000 shares. The number of shares of common stock available for issuance under the 2007 Plan automatically increased on January 1, 2008 and 2009, by an amount equal to two percent (2%) of the total number of shares of common stock outstanding on the last trading day of December in the prior calendar year. After January 1, 2009, no new additional shares will be added to the 2007 Plan without stockholder approval (except for shares subject to outstanding awards that are forfeited or otherwise returned to the 2007 Plan). At December 31, 2009, there were 542,000 shares available for grant under the 2007 Plan.

The Plans do not segregate the number of securities remaining available for future issuance among stock options and other awards. The shares authorized for future issuance represents the total number of shares available through any combination of stock options or other awards. Upon the exercise of stock options, the granting of restricted stock, or the delivery of shares pursuant to vested restricted stock units, it is Acacia’s policy to issue new shares of common stock.

Acacia’s board of directors may amend or modify the Plans at any time, subject to any required stockholder approval. The Plans will terminate no later than the tenth anniversary of the approval of the incentive plans by Acacia’s stockholders.

F-26

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table summarizes stock option activity for the Plans for the year ended December 31, 2009:

			Weighted-Average
	Options		Exercise Price		Remaining Contractual Term	Aggregate Intrinsic Value

Outstanding at December 31, 2008	3,656,000			$5.55
Exercised	(94,000	)		$2.61
Expired	(114,000	)		$8.55
Outstanding at December 31, 2009	3,448,000			$5.54	3.7 years	$13,900,000
Vested and expected to vest at December 31, 2009	3,448,000			$5.54	3.7 years	$13,900,000
Exercisable at December 31, 2009	3,425,000			$5.48	3.6 years	$13,892,000

The weighted-average grant date fair value of stock options granted during the year ended December 31, 2007 was $9.07. There were no stock options granted during the years ended December 31, 2009 and 2008. The total intrinsic value of options exercised during the years ended December 31, 2009, 2008 and 2007 was $541,000, $120,000, and $10,812,000, respectively. The fair value of options that vested during the years ended December 31, 2009, 2008 and 2007 was $587,000, $1,534,000, and $3,520,000, respectively. As of December 31, 2009, the total unrecognized compensation expense related to nonvested stock option awards was $149,000, which is expected to be recognized over a weighted-average term of approximately 6 months.

The following table summarizes nonvested restricted share activity for the year ended December 31, 2009:

	Nonvested Restricted Shares		Weighted Average Grant Date Fair Value

Nonvested restricted stock at December 31, 2008	1,257,000			$7.77
Granted	1,152,000			$3.51
Vested	(724,000	)		$8.69
Forfeited	(45,000	)		$8.52
Nonvested restricted stock at December 31, 2009	1,640,000			$4.35

The weighted-average grant date fair value of nonvested restricted stock granted during the years ended December 31, 2009, 2008 and 2007 was $3.51, $4.80, and $14.05, respectively. The fair value of restricted stock that vested during the years ended December 31, 2009, 2008 and 2007 was $6,291,000, $5,556,000, and $1,951,000, respectively. As of December 31, 2009, the total unrecognized compensation expense related to nonvested restricted stock awards was $3,823,000, which is expected to be recognized over a weighted-average period of approximately 1 year.

F-27

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table summarizes restricted stock unit activity for the year ended December 31, 2009:

	Restricted Stock Units			Weighted Average Grant Date Fair Value

Restricted stock units outstanding at December 31, 2008		11,000			$9.10
Granted		41,000			$3.50
Vested		(15,000	)		$5.42
Restricted stock units outstanding at December 31, 2009		37,000			$4.40

The weighted-average grant date fair value of restricted stock units granted during the years ended December 31, 2009, 2008 and 2007 was $3.50, $8.68 and $11.19, respectively. The fair value of restricted stock units that vested during the years ended December 31, 2009, 2008 and 2007 was $84,000, $39,000 and $3,000, respectively. As of December 31, 2009, the total unrecognized compensation expense related to restricted stock unit awards was $140,000, which is expected to be recognized over a weighted-average period of approximately 1.7 years.

As of December 31, 2009, 5,340,000 shares of common stock are reserved for issuance under the Plans.

13. COMMITMENTS AND CONTINGENCIES

Operating Leases

Acacia leases certain office space under various operating lease agreements expiring in 2012. Minimum annual rental commitments for operating leases of continuing operations having initial or remaining noncancellable lease terms in excess of one year are as follows (in thousands):

Year
2010	$	869
2011		977
2012		164
Total minimum lease payments	$	2,010

Rent expense related to continuing operations for the years ended December 31, 2009, 2008 and 2007 approximated $983,000, $965,000 and $749,000, respectively. Rental payments are expensed in the statements of operations in the period to which they relate. Scheduled rent increases are amortized on a straight-line basis over the lease term.

F-28

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Inventor Royalties and Contingent Legal Expenses

In connection with the acquisition of certain patents and patent rights, certain of Acacia’s operating subsidiaries executed related agreements which grant to the former owners of the respective patents or patent rights, the right to receive inventor royalties based on future net license fee revenues (as defined in the respective agreements) generated as a result of licensing the respective patents or patent portfolios. Inventor royalties paid pursuant to the agreements are expensed in the consolidated statements of operations in the period that the related license fee revenues are recognized. In certain instances, pursuant to the terms of the underlying inventor agreements, costs paid by Acacia’s operating subsidiaries to acquire patents are recoverable from future net revenues. Patent acquisition costs that are recoverable from future net revenues are amortized over the estimated economic useful life of the related patents, or as the prepaid royalties are earned by the inventor, as appropriate, and the related expense is included in amortization expense in the consolidated statements of operations. Any unamortized patent acquisition costs recovered from net revenues are expensed in the period recovered, and included in amortization expense in the consolidated statements of operations.

Acacia’s operating subsidiaries may retain the services of law firms that specialize in intellectual property licensing and enforcement and patent law in connection with their licensing and enforcement activities. These law firms may be retained on a contingent fee basis whereby such law firms are paid on a scaled percentage of any negotiated license fees, settlements or judgments awarded based on how and when the license fees, settlements or judgments are obtained. In instances where there are no recoveries from potential infringers (i.e. license fees), no contingent legal fees are paid; however, Acacia’s operating subsidiaries may be liable for certain out of pocket legal costs incurred pursuant to the underlying legal services agreement. Legal fees advanced by contingent law firms that are required to be paid in the event that no license recoveries are obtained are expensed as incurred and included in liabilities in the consolidated balance sheets.

Patent Enforcement and Other Litigation

Acacia is subject to claims, counterclaims and legal actions that arise in the ordinary course of business. Management believes that the ultimate liability with respect to these claims and legal actions, if any, will not have a material effect on Acacia’s consolidated financial position, results of operations or cash flows.

Certain of Acacia’s operating subsidiaries are often required to engage in litigation to enforce their patents and patent rights. In connection with any of Acacia’s operating subsidiaries’ patent enforcement actions, it is possible that a defendant may request and/or a court may rule that an operating subsidiary has violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against Acacia or its operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material, and if required to be paid by Acacia or its operating subsidiaries, could materially harm the Company’s operating results and financial position.

F-29

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Guarantees and Indemnifications

Certain of Acacia’s operating subsidiaries have made guarantees and indemnities under which they may be required to make payments to a guaranteed or indemnified party, in relation to certain transactions, including revenue transactions in the ordinary course of business. In connection with certain facility leases Acacia and certain of its operating subsidiaries have indemnified lessors for certain claims arising from the facilities or the leases. Acacia indemnifies its directors and officers to the maximum extent permitted under the laws of the State of Delaware. However, Acacia has a directors and officers insurance policy that may reduce its exposure in certain circumstances and may enable it to recover a portion of future amounts that may be payable, if any. The duration of the guarantees and indemnities varies and, in many cases is indefinite but subject to statute of limitations. The majority of guarantees and indemnities do not provide any limitations of the maximum potential future payments that Acacia could be obligated to make. To date, Acacia has made no payments related to these guarantees and indemnities. Acacia estimates the fair value of its indemnification obligations to be insignificant based on this history and have therefore, not recorded any liability for these guarantees and indemnities in the accompanying consolidated balance sheets.

Other

Creative Internet Advertising Corporation (“CIAC”), an operating subsidiary of Acacia, received a $12.4 million final judgment stemming from its May 2009 trial verdict and corresponding $6.6 million damages award in its patent infringement lawsuit with Yahoo! Inc. In the final judgment, signed on February 1, 2010, the District Court for the Eastern District of Texas awarded enhanced damages for willful infringement of $4.5 million. The District Court also awarded prejudgment interest of $1.1 million, as well as supplemental damages, bringing the total award to approximately $12.4 million. In addition, the District Court’s final judgment awarded a post-verdict ongoing royalty rate of 23% for all of Yahoo’s IMVironments sales. Yahoo! Inc has filed a notice of its intent to appeal the verdict.

During 2009, CIAC purchased a specific contingency insurance policy covering approximately $6.9 million of the final judgment described above. Under the policy, the insurer will, subject to all of the terms, conditions, and limitations of the underlying policy, indemnify CIAC for covered losses incurred as a result of a final adjudication entered in the underlying litigation (for example, as a result of a successful appeal by the defendant in the litigation) which results in a revised final judgment amount that is less than the $6.9 million of the original final judgment covered under the policy.

14. RETIREMENT SAVINGS PLAN AND EXECUTIVE SEVERANCE POLICY

Retirement Savings Plan. Acacia has an employee savings and retirement plan under section 401(k) of the Code (the “Plan”). The Plan is a defined contribution plan in which eligible employees may elect to have a percentage of their compensation contributed to the Plan, subject to certain guidelines issued by the Internal Revenue Service. Acacia may contribute to the Plan at the discretion of the board of directors. There were no contributions made by Acacia during the years ended December 31, 2009, 2008 and 2007.

Executive Severance Policy. Under Acacia’s Amended Executive Severance Policy, full-time employees with the title of Senior Vice President and higher (“Officer”) are entitled to receive certain benefits upon termination of employment. If employment of an Officer is terminated for other than cause or other than on account of death or disability, Acacia will (i) promptly pay to the Officer a lump sum amount equal to the aggregate of (a) accrued obligations ( i.e., the Officer’s annual base salary through the date of termination to the extent not theretofore paid and any compensation previously deferred by the Officer (together with any accrued interest or earnings thereon) and any accrued vacation pay, and reimbursable expenses, in each case to the extent not theretofore paid) and (b) three (3) months of the Officer’s base salary for each full year that the Officer was employed by the Company (the "Severance Period"), up to a maximum of twelve (12) months of the Officer's base salary and (ii) provide to the Officer, Acacia paid COBRA coverage for the medical and dental benefits selected by the Officer in the year in which the termination occurs, for the duration of the Severance Period.

F-30

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

15. COMPREHENSIVE LOSS

Total comprehensive loss attributable to Acacia Research Corporation is as follows (in thousands):

	2009			2008			2007

Net loss from continuing operations including noncontrolling interests in operating subsidiary	$	(5,633	)	$	(13,757	)	$	(7,359	)
Other comprehensive income:
Unrealized gain (loss) on short-term investments		-			3			(21	)
Unrealized gains from discontinued operations - Split-off of CombiMatrix Corporation		-			-			16
Total comprehensive loss before noncontrolling interests in operating subsidiary and loss from discontinued operations		(5,633	)		(13,754	)		(7,364	)

Net income attributable to noncontrolling interests in operating subsidiary		(5,657	)		-			-
Loss from discontinued operations - Split-off of CombiMatrix Corporation		-			-			(8,086	)
Comprehensive loss	$	(11,290	)	$	(13,754	)	$	(15,450	)

16. SUPPLEMENTAL CASH FLOW INFORMATION

Cash paid by Acacia for income taxes was not material for the periods presented. Refer to Note 6 for impairment charges, and other non-cash changes in patent-related intangibles during the periods presented. Refer to Notes 11 for information regarding the Split-Off Transaction.

17. QUARTERLY FINANCIAL DATA (unaudited)

The following table sets forth unaudited consolidated statements of operations data for the eight quarters in the period ended December 31, 2009. This information has been derived from Acacia’s unaudited condensed consolidated financial statements that have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, include all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the information when read in conjunction with the audited consolidated financial statements and related notes thereto. Acacia’s quarterly results have been in the past and may in the future be subject to significant fluctuations. As a result, Acacia believes that results of operations for interim periods should not be relied upon as any indication of the results to be expected in any future periods.

Refer to Note 8 for information on the Company’s change in revenue recognition accounting policy for its term license agreements and the impact on the quarterly periods presented in the table below.

F-31

ACACIA RESEARCH CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

	Quarter Ended
	Mar. 31,			Jun. 30,			Sep. 30,			Dec. 31,			Mar. 31,			Jun. 30,			Sep. 30,			Dec. 31,
	2009			2009			2009			2009			2008			2008			2008			2008
							(In thousands, except share and per share information)
							(Unaudited)
License fee revenues	$	16,957		$	14,356		$	16,169		$	19,858		$	9,048		$	7,116		$	13,796		$	18,267

Operating costs and expenses:
Cost of revenues:
Inventor royalties		5,377			2,019			4,673			3,604			2,090			2,177			4,329			6,399
Contingent legal fees		3,532			3,190			3,799			5,424			2,641			1,928			3,934			3,926
Litigation and licensing expenses - patents		1,708			2,753			3,957			5,637			1,603			1,509			1,554			2,234
Amortization of patents		1,065			1,060			1,245			1,264			1,335			1,244			1,152			2,312
Marketing, general and administrative expenses (including non-cash stock compensation expense)		5,378			5,748			4,709			5,235			5,648			5,400			5,254			4,828
Research, consulting and other expenses - business development		414			396			363			516			391			111			210			221
Total operating costs and expenses		17,474			15,166			18,746			21,680			13,708			12,369			16,433			19,920
Operating loss		(517	)		(810	)		(2,577	)		(1,822	)		(4,660	)		(5,253	)		(2,637	)		(1,653	)
Other income (expense)		287			47			224			(256	)		192			238			255			(115	)
Loss from continuing operations before provision for income taxes		(230	)		(763	)		(2,353	)		(2,078	)		(4,468	)		(5,015	)		(2,382	)		(1,768	)
Provision for income taxes		(38	)		(39	)		(47	)		(85	)		(21	)		(26	)		(38	)		(39	)
Net loss including noncontrolling interests in operating subsidiary		(268	)		(802	)		(2,400	)		(2,163	)		(4,489	)		(5,041	)		(2,420	)		(1,807	)
Net income attributable to noncontrolling interests in operating subsidiary		-			(2,121	)		(1,029	)		(2,507	)		-			-			-			-

Net loss attributable to Acacia Research Corporation	$	(268	)	$	(2,923	)	$	(3,429	)	$	(4,670	)	$	(4,489	)	$	(5,041	)	$	(2,420	)	$	(1,807	)

Net loss per common share attributable to Acacia Research Corporation:
Basic and diluted net loss per share		(0.01	)		(0.10	)		(0.11	)		(0.15	)		(0.15	)		(0.17	)		(0.08	)		(0.06	)

Weighted average number of shares outstanding, basic and diluted		29,639,459			29,741,168			30,071,492			30,199,211			29,217,636			29,321,176			29,553,609			29,599,602

____________________

(1)

Refer to Note 8 for information on the change in Acacia’s revenue recognition accounting policy for its term license agreements. The change was accounted for through retrospective application of the new accounting policy as of January 1, 2009, and has been reflected in the quarterly financial data above. The effect of applying the new accounting policy to term licenses in periods prior to fiscal 2009 was not material. Accordingly, the Company’s consolidated financial statements for all periods ending prior to January 1, 2009 have not been retroactively adjusted for this change in accounting policy. Refer to Note 8 for information on the effect of the change in accounting policy on our consolidated financial statement line items for the applicable reporting periods during 2009.

F-32

EXHIBIT INDEX

Exhibit Number	Description

2.1	Agreement and Plan of Merger of Acacia Research Corporation, a California corporation, and Acacia Research Corporation, a Delaware corporation, dated as of December 23, 1999 (1)
2.2	Agreement and Plan of Reorganization by and among Acacia Research Corporation, Combi Acquisition Corp. and CombiMatrix Corporation dated as of March 20, 2002 (2)
3.1	Amended and Restated Certificate of Incorporation (3)
3.2	Amended and Restated Bylaws (13)
3.2.1	Amendment to Amended and Restated Bylaws (14)
10.1*	Acacia Research Corporation 1996 Stock Option Plan, as amended (4)
10.2*	Form of Option Agreement constituting the Acacia Research Corporation 1996 Executive Stock Bonus Plan (5)
10.3*	2002 Acacia Technologies Stock Incentive Plan (6)
10.4*	2007 Acacia Technologies Stock Incentive Plan (7)
10.5*	Form of Acacia Technologies Stock Option Agreement for the 2007 Acacia Technologies Stock Incentive Plan (8)
10.6*	Form of Acacia Technologies Stock Issuance Agreement for the 2002 Acacia Technologies Stock Incentive Plan (8)
10.7*	Form of Acacia Technologies Stock Issuance Agreement for the 2007 Acacia Technologies Stock Incentive Plan (8)
10.8	Lease Agreement dated January 28, 2002, between Acacia Research Corporation and The Irvine Company (9)
10.10	Form of Indemnification Agreement (10)
10.11	Form of Subscription Agreement between Acacia Research Corporation and certain investors (11)
10.12	Third Amendment to lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (12)
10.19*	Employment Agreement, dated January 28, 2005, by and between Acacia Technologies Services Corporation, and Dooyong Lee, as amended (13)
10.19.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Dooyong Lee (16)
10.20*	Employment Agreement, dated April 12, 2004, by and between Acacia Media Technologies Corporation and Edward Treska (13)
10.20.1*	Addendum to Employment Agreement with Edward Treska, dated March 31, 2008 (15)
10.21	Fourth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (13)
10.22	Fifth Amendment to Lease dated January 28, 2002 between Acacia Research Corporation and the Irvine Company (13)
10.23*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Paul Ryan (15)
10.23.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Paul Ryan (16)
10.24*	Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (15)
10.24.1*	Amendment to Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Robert L. Harris (16)
10.25*	Amended Employment Agreement, dated March 31, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (15)
10.25.1*	Amendment to Amended Employment Agreement, dated December 17, 2008, by and between Acacia Technologies, LLC and Clayton J. Haynes (16)
10.26*	Amended Acacia Research Corporation Executive Severance Policy (16)
18.1	Preferability Letter dated February 25, 2010 from Grant Thornton LLP, Acacia Research Corporation’s registered independent accounting firm, regarding change in accounting principle
21.1	List of Subsidiaries
23.1	Consent of Independent Registered Public Accounting Firm
24.1	Power of Attorney (included in the signature page).

III-1

Exhibit Number	Description
31.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
31.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934
32.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350
32.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(b)/15d-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350

______________

*	The referenced exhibit is a management contract, compensatory plan or arrangement.

(1)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on December 30, 1999 (SEC File No. 000-26068).

(2)	Incorporated by reference to Appendix A to the Proxy Statement/Prospectus which formed part of Acacia Research Corporation’s Registration Statement on Form S-4 (SEC File No. 333-87654) which became effective on November 8, 2002.

(3)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on June 5, 2008 (SEC File No. 000-26068).

(4)	Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 10, 2000 (SEC File No. 000-26068).

(5)	Incorporated by reference to Appendix A to Acacia Research Corporation’s Definitive Proxy Statement on Schedule 14A filed on April 26, 1996 (SEC File No. 000-26068).

(6)	Incorporated by reference to Appendix E to the Proxy Statement/Prospectus which formed part of Acacia Research Corporation’s Registration Statement on Form S-4 (SEC File No. 333-87654) which became effective on November 8, 2002.

(7)	Incorporated by reference to Acacia Research Corporation’s Registration Statement on Form S-8 (SEC File No. 333-144754) which became effective on July 20, 2007.

(8)	Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended September 30, 2007, filed on November 2, 2007 (SEC File No. 000-26068).

(9)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2001, filed on March 27, 2002 (SEC File No. 000-26068).

(10)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2002, filed on March 27, 2003 (SEC File No. 000-26068).

(11)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on September 19, 2005 (SEC File No. 000-26068).

(12)	Incorporated by reference to Acacia Research Corporation’s Quarterly Report on Form 10-Q for the period ended March 31, 2006, filed on May 10, 2006 (SEC File No. 000-26068).

(13)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2007, filed on March 14, 2008 (File No. 000-26068).

(14)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on January 7, 2008 (File No. 000-26068).

(15)	Incorporated by reference to Acacia Research Corporation’s Current Report on Form 8-K filed on April 2, 2008 (SEC File No. 000-26068).

(16)	Incorporated by reference to Acacia Research Corporation’s Annual Report on Form 10-K for the year ended December 31, 2008, filed on February 26, 2009 (File No. 000-26068).

III-2

Positive
Negative
Uncertain
Constraining
Legalese
Litigous
Readability	H.S. sophomore Avg

Acacia Research (ACTG) 10-K2009 FY Annual report

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