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SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2004

OR

FOR THE TRANSITION PERIOD FROM                          TO                        

COMMISSION FILE NUMBER 001-13709

ANWORTH MORTGAGE ASSET CORPORATION

(Exact Name of Registrant as Specified in Its Charter)

Registrant’s telephone number, including area code: (310) 255-4493

Securities registered pursuant to Section 12(b) of the Act: NONE

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

PREFERRED STOCK, $0.01 PAR VALUE

COMMON STOCK, $0.01 PAR VALUE

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  x    No  ¨

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.  ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act). Yes  x    No  ¨

The aggregate market value of the voting stock held by non-affiliates of the registrant, computed by reference to the average closing bid and asked prices of such stock, as of June 30, 2004, was approximately $526,764,665 (All officers and directors of the registrant are considered affiliates).

At March 14, 2005 the registrant had 1,610,500 shares of Series A Cumulative Preferred Stock issued and outstanding and 47,160,111 shares of Common Stock issued and outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Part III of the Form 10-K incorporates by reference certain portions of the Registrant’s proxy statement for its 2005 annual meeting of stockholders to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this report.

ANWORTH MORTGAGE ASSET CORPORATION

FORM 10-K ANNUAL REPORT

FISCAL YEAR ENDED DECEMBER 31, 2004

TABLE OF CONTENTS

CAUTIONARY STATEMENT

This Report contains or incorporates by reference certain forward-looking statements. Forward-looking statements are those that predict or describe future events or trends and that do not relate solely to historical matters. You can generally identify forward-looking statements as statements containing the words “will,” “believe,” “expect,” “anticipate,” “intend,” “estimate,” “assume” or other similar expressions. You should not rely on our forward-looking statements because the matters they describe are subject to known and unknown risks, uncertainties and other unpredictable factors, many of which are beyond our control. These forward-looking statements are subject to assumptions that are difficult to predict and to various risks and uncertainties. Therefore, our actual results could differ materially and adversely from those expressed in any forward-looking statements as a result of various factors, some of which are listed under the section “Risk Factors” at the end of Item 7 of this Report. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

As used in this Form 10-K, “company,” “we,” “us,” “our,” “Anworth” and “Anworth Mortgage” refer to Anworth Mortgage Asset Corporation.

PART I

Item 1.     BUSINESS

Overview

We are in the business of investing primarily in United States agency and other highly rated single-family adjustable-rate and fixed-rate mortgage-backed securities and residential mortgage loans that we acquire in the secondary market. United States agency securities are securities that are obligations guaranteed by the United States government or its sponsored enterprises or agencies such as Fannie Mae (FNM), Freddie Mac (FHLMC) or Ginnie Mae (GNMA). We seek attractive long-term investment returns by investing our equity capital and borrowed funds in such securities. Our returns are principally earned on the spread between the yield on our interest-earning assets and the interest cost of the funds we borrow.

We were incorporated in Maryland on October 20, 1997 and commenced our operations on March 17, 1998. From the time of our inception through June 13, 2002, we were externally managed pursuant to a management agreement with Anworth Mortgage Advisory Corporation, or the manager. As an externally managed company, we had no employees of our own and relied on the manager to conduct our business and operations. On June 13, 2002, the manager merged with and into our company. As a result of the merger, we are an internally managed company.

On November 3, 2003, we formed our wholly-owned subsidiary, Belvedere Trust Mortgage Corporation, or Belvedere Trust. Belvedere Trust was formed to acquire, own and securitize mortgage loans, with a focus on high credit-quality jumbo adjustable-rate, hybrid and second-lien mortgages. Belvedere Trust acquires mortgage loans, securitizes a substantial amount of those mortgage loans and then retains a portion of the mortgage-backed securities, while selling the balance to third parties in the secondary market. The mortgage-backed securities it retains are purchased by one of our qualified REIT subsidiaries to maximize tax efficiency on the interest income on those securities. Since its formation, Belvedere Trust has become an increasingly important part of our overall operations. As of December 31, 2004, we had made an investment of approximately $96 million in Belvedere Trust to capitalize its mortgage operations.

Belvedere Trust is externally managed by BT Management Company, L.L.C., or BT Management, a Delaware limited liability company that is owned 50% by Anworth and 50% by the executive officers of Belvedere Trust. BT Management manages Belvedere Trust through a management agreement with Belvedere Trust pursuant to which BT Management manages the day-to-day operations of Belvedere Trust in exchange for an annual base management fee and a quarterly incentive fee.

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At December 31, 2004, we had total assets of $7.3 billion. Our portfolio consisted of $4.6 billion of agency mortgage-backed securities allocated as follows: 31% agency adjustable-rate mortgage-backed securities, 64% agency hybrid adjustable-rate mortgage-backed securities, 4% agency fixed-rate mortgage-backed securities and 1% agency floating-rate CMOs. Our non-agency mortgage-backed securities held at December 31, 2004 were approximately $63 million, mostly retained from our first whole loan securitization. Mortgage loans held for securitization at December 31, 2004 were $578 million and securitized mortgage loans were $2.05 billion. As of December 31, 2004, Belvedere Trust’s assets comprised 37% of our overall assets, or approximately $2.7 billion in mortgage-related assets. Our total equity at December 31, 2004 was $507 million. Common stockholders’ equity was approximately $480 million, or $10.31 per share. For the year ended December 31, 2004, we reported net income of $55.8 million, or $1.22 per diluted share available to common stockholders.

We have elected to be taxed as a real estate investment trust, or REIT, under the United States Internal Revenue Code (“the tax code”). As a REIT, we routinely distribute substantially all of the income generated from our operations to our stockholders. As long as we retain our REIT status, we generally will not be subject to federal or state taxes on our income to the extent that we distribute our net income to our stockholders. Certain direct and indirect subsidiaries of Belvedere Trust are taxable REIT subsidiaries and, as such, are liable for corporate income tax expenses.

Our Strategy

Investment Strategy

Our strategy is to invest primarily in United States agency and other highly rated single-family adjustable-rate and fixed-rate mortgage-backed securities that we acquire in the secondary market and, through our investment in our subsidiary, Belvedere Trust, we invest in primarily high quality jumbo residential real estate mortgage loans. We seek to acquire assets that will produce competitive returns after considering the amount and nature of the anticipated returns from the investment, our ability to pledge the investment to secure collateralized borrowings and the costs associated with financing, managing, securitizing and reserving for these investments. We do not currently originate mortgage loans or provide other types of financing to the owners of real estate. Through Belvedere Trust, we also acquire mortgage loans with a focus on high credit-quality jumbo adjustable-rate, hybrid and second-lien mortgages. Mortgage loans may be purchased from various suppliers of mortgage-related assets throughout the United States, including savings and loans associations, banks, mortgage bankers and other mortgage lenders. We may acquire mortgage loans directly from originators and from entities which hold mortgage loans originated by others.

Financing Strategy

We finance the acquisition of mortgage-related assets with short-term borrowings and, to a lesser extent, equity capital. The amount of short-term borrowings we employ depends on, among other factors, the amount of our equity capital. We use leverage to attempt to increase potential returns to our stockholders. Pursuant to our capital and leverage policy, we seek to strike a balance between the under-utilization of leverage, which reduces potential returns to stockholders, and the over-utilization of leverage, which could reduce our ability to meet our obligations during adverse market conditions.

We usually borrow at short-term rates using repurchase agreements. Repurchase agreements are generally short-term in nature. We actively manage the adjustment periods and the selection of the interest rate indices of our borrowings against the adjustment periods and the selection of indices on our mortgage-related assets in order to limit our liquidity and interest rate-related risks. We generally seek to diversify our exposure by entering into repurchase agreements with multiple lenders. In addition, we enter into repurchase agreements with major lending institutions we believe are financially sound and are approved by our board of directors.

We finance our acquisition of residential real estate mortgage loans using long-term debt (obligations due on pass-through certificates or bonds) through securitizations. The interest rates on the long-term debt are variable and are based either upon the interest rates on the underlying loan collateral or upon LIBOR (London

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Interbank Offered Rate). The maturities on the long-term debt are also based upon the maturities of the underlying mortgages. In addition, we enter into whole loan warehouse financing facilities to finance our residential loan acquisitions prior to securitization. The whole loan warehouse financing facilities are short-term borrowings that are secured by the loans.

Growth Strategy

In addition to the strategies described above, we intend to pursue other strategies to further grow our earnings and our dividends per share which may include the following:

Our Operating Policies and Programs

We have established the following four primary operating policies to implement our business strategies:

Asset Acquisition Policy

Our Asset Acquisition Policy provides guidelines for acquiring investments and contemplates that we will acquire a portfolio of investments that can be grouped into specific categories. Each category and our respective investment guidelines are as follows:

Under our Category III investment criteria, we may acquire other types of mortgage derivative securities including, but not limited to, interest-only, principal-only or other mortgage-backed securities that receive a disproportionate share of interest income or principal.

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Capital and Leverage Policy

We employ a leverage strategy to increase our investment assets by borrowing against existing mortgage-related assets and using the proceeds to acquire additional mortgage-related assets. Relative to our investment in investment grade agency mortgage-backed securities, we generally borrow between eight to twelve times the amount of our equity allocated to these investments. Our borrowings may vary from time to time depending on market conditions and other factors deemed relevant by our management and our board of directors. We believe that this will leave an adequate capital base to protect against interest rate environments in which our borrowing costs might exceed our interest income from mortgage-related assets. We enter into collateralized borrowings with major lending institutions which we believe are financially sound and are approved by our board of directors.

Depending on the different cost of borrowing funds at different maturities, we may vary the maturities of our borrowed funds in an attempt to produce lower borrowing costs. Our borrowings are short-term and we manage actively, on an aggregate basis, both the interest rate indices and interest rate adjustment periods of our borrowings against the interest rate indices and interest rate adjustment periods on our mortgage-related assets.

Our mortgage-related assets are financed primarily at short-term borrowing rates through repurchase agreements and dollar-roll agreements. In the future, we may also employ borrowings under lines of credit and other collateralized financings that we may establish with approved institutional lenders.

Belvedere Trust principally employs securitization to finance its ownership of real estate mortgage loans.

Credit Risk Management Policy

We review credit risk and other risks of loss associated with each of our potential investments. In addition, we may diversify our portfolio of mortgage-related assets to avoid undue geographic, insurer, industry and certain other types of concentrations. We may reduce certain risks from sellers and servicers through representations and warranties. Our board of directors monitors the overall portfolio risk and determines appropriate levels of provision for losses.

Compliance with our Credit Risk Management Policy guidelines is determined at the time of purchase of mortgage assets based upon the most recent valuation utilized by us. Such compliance is not affected by events subsequent to such purchase including, without limitation, changes in characterization, value or rating of any specific mortgage assets or economic conditions or events generally affecting any mortgage-related assets of the type held by us.

Asset/Liability Management Policy

Interest Rate Risk Management.    To the extent consistent with our election to qualify as a REIT, we follow an interest rate risk management program intended to protect our portfolio of mortgage-related assets and related debt against the effects of major interest rate changes. Specifically, our interest rate management program is formulated with the intent to offset, to some extent, the potential adverse effects resulting from rate adjustment limitations on our mortgage-related assets and the differences between interest rate adjustment indices and interest rate adjustment periods of our adjustable-rate mortgage-related assets and related borrowings.

Our interest rate risk management program encompasses a number of procedures, including the following:

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We expect to be able to adjust the average maturity/adjustment period of our borrowings on an ongoing basis by changing the mix of maturities and interest rate adjustment periods as borrowings come due or are renewed. Through the use of these procedures, we attempt to reduce the risk of differences between interest rate adjustment periods of our adjustable-rate mortgage-related assets and our related borrowings.

Depending on market conditions and the cost of the transactions, we may conduct certain hedging activities in connection with the management of our portfolio. To the extent consistent with our election to qualify as a REIT, we may adopt a hedging strategy intended to lessen the effects of interest rate changes and to enable us to earn net interest income in periods of generally rising, as well as declining or static, interest rates. Specifically, hedging programs are formulated with the intent to offset some of the potential adverse effects of changes in interest rate levels relative to the interest rates on the mortgage-related assets held in our investment portfolio and differences between the interest rate adjustment indices and periods of our mortgage-related assets and our borrowings. We monitor carefully, and may have to limit, our asset/liability management program to assure that we do not realize excessive hedging income, or hold hedges having excess value in relation to mortgage-related assets, which could result in our disqualification as a REIT or, in the case of excess hedging income, if the excess is due to reasonable cause and not willful neglect, the payment of a penalty tax for failure to satisfy certain REIT income tests under the tax code. In addition, asset/liability management involves transaction costs that increase dramatically as the period covered by hedging protection increases and that may increase during periods of fluctuating interest rates.

Prepayment Risk Management.    We also seek to lessen the effects of prepayment of mortgage loans underlying our securities at a faster or slower rate than anticipated. We accomplish this by structuring a diversified portfolio with a variety of prepayment characteristics, investing in mortgage-related assets with prepayment prohibitions and penalties, investing in certain mortgage security structures that have prepayment protections and purchasing mortgage-related assets at a premium and at a discount. We invest in mortgage-related assets that, on a portfolio basis, do not have significant purchase price premiums. Under normal market conditions, we seek to maintain the aggregate capitalized purchase premium of the portfolio at 3% or less. In addition, we can purchase principal-only derivatives to a limited extent as a hedge against prepayment risks. We monitor prepayment risk through periodic review of the impact of a variety of prepayment scenarios on our revenues, net earnings, dividends, cash flow and net consolidated balance sheets market value.

We believe that we have developed cost-effective asset/liability management policies to mitigate prepayment risks. However, no strategy can completely insulate us from prepayment risks. Further, as noted above, certain of the federal income tax requirements that we must satisfy to qualify as a REIT limit our ability to fully hedge our prepayment risks. Therefore, we could be prevented from effectively hedging our interest rate and prepayment risks.

Our Investments

Mortgage-Backed Securities

Pass-Through Certificates.    We principally invest in pass-through certificates, which are securities representing interests in pools of mortgage loans secured by residential real property in which payments of both interest and principal on the securities are generally made monthly, in effect, “passing through” monthly payments made by the individual borrowers on the mortgage loans which underlie the securities, net of fees paid to the issuer or guarantor of the securities. Early repayment of principal on some mortgage-backed securities, arising from prepayments of principal due to sale of the underlying property, refinancing or foreclosure, net of fees and costs which may be incurred, may expose us to a lower rate of return upon reinvestment of principal. This is generally referred to as “prepayment risk”. Additionally, if a security subject to prepayment has been purchased at a premium, the unamortized value of the premium would be lost in the event of prepayment.

Like other fixed-income securities, when interest rates rise, the value of a mortgage-backed security generally will decline. When interest rates are declining, however, the value of mortgage-backed securities with prepayment features may not increase as much as other fixed-income securities. The rate of prepayments on

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underlying mortgages will affect the price and volatility of mortgage-backed securities and may have the effect of shortening or extending the effective maturity of the security beyond what was anticipated at the time of purchase. When interest rates rise, our holdings of mortgage-backed securities may experience reduced returns if the owners of the underlying mortgages pay off their mortgages later than anticipated. This is generally referred to as “extension risk”.

Payment of principal and interest on some mortgage pass-through securities, though not the market value of the securities themselves, may be guaranteed by the full faith and credit of the federal government, including securities backed by Ginnie Mae, or by agencies or instrumentalities of the federal government, including Fannie Mae and Freddie Mac. Mortgage-backed securities created by non-governmental issuers, including commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers, may be supported by various forms of insurance or guarantees including individual loan, title, pool and hazard insurance and letters of credit which may be issued by governmental entities, private insurers or the mortgage poolers.

Collateralized Mortgage Obligations.    Collateralized mortgage obligations, or CMOs, are mortgage-backed securities. Interest and principal on a CMO are paid, in most cases, on a monthly basis. CMOs may be collateralized by whole mortgage loans, but are more typically collateralized by portfolios of mortgage pass-through securities. CMOs are structured into multiple classes, with each class bearing a different stated maturity. Monthly payments of principal, including prepayments, are first returned to investors holding the shortest maturity class; investors holding the longer maturity classes receive principal only after the first class has been retired. We will typically consider CMOs that are issued or guaranteed by the federal government, or by any of its agencies or instrumentalities, to be United States government securities.

Other Mortgage-Backed Securities

Mortgage Derivative Securities.    We may acquire mortgage derivative securities in an amount not to exceed 10% of our total assets. Mortgage derivative securities provide for the holder to receive interest-only, principal-only or interest and principal in amounts that are disproportionate to those payable on the underlying mortgage loans. Payments on mortgage derivative securities are highly sensitive to the rate of prepayments on the underlying mortgage loans. In the event of faster or slower than anticipated prepayments on these mortgage loans, the rates of return on interests in mortgage derivative securities, representing the right to receive interest-only or a disproportionately large amount of interest or interest-only derivatives, would be likely to decline or increase, respectively. Conversely, the rates of return on mortgage derivative securities, representing the right to receive principal-only or a disproportionate amount of principal or principal-only derivatives, would be likely to increase or decrease in the event of faster or slower prepayments, respectively.

We may invest in inverse floaters, a class of CMOs with a coupon rate that resets in the opposite direction from the market rate of interest to which it is indexed, including LIBOR or the 11^th District Cost of Funds Index, or COFI. Any rise in the index rate, which can be caused by an increase in interest rates, causes a drop in the coupon rate of an inverse floater, while any drop in the index rate causes an increase in the coupon of an inverse floater. An inverse floater may behave like a leveraged security since its interest rate usually varies by a magnitude much greater than the magnitude of the index rate of interest. The leverage-like characteristics inherent in inverse floaters result in a greater volatility of their market prices.

We may invest in other mortgage derivative securities that may be developed in the future.

Subordinated Interests.    We may acquire subordinated interests, which are classes of mortgage-backed securities that are junior to other classes of the same series of mortgage-backed securities in the right to receive payments from the underlying mortgage loans. The subordination may be for all payment failures on the mortgage loans securing or underlying such series of mortgage securities. The subordination will not be limited to those resulting from particular types of risks, including those resulting from war, earthquake or flood, or the bankruptcy of a borrower. The subordination may be for the entire amount of the series of mortgage-related securities or may be limited in amount.

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Mortgage Warehouse Participations.    We may occasionally acquire mortgage warehouse participations as an additional means of diversifying our sources of income. We anticipate that these investments, together with our investments in other Category III assets, will not in the aggregate exceed 10% of our total mortgage-related assets. These investments are participations in lines of credit to mortgage loan originators secured by recently originated mortgage loans that are in the process of being sold to investors. Our investments in mortgage warehouse participations are limited because they are not qualified REIT assets under the tax code.

Other Mortgage-Related Assets

Mortgage Loans.    We also acquire and accumulate mortgage loans through Belvedere Trust as part of our investment strategy until a sufficient quantity has been accumulated for securitization into high-quality mortgage-backed securities in order to enhance their value and liquidity. We anticipate that any mortgage loans that we acquire and do not immediately securitize, together with our investments in other mortgage-related assets that are not Category I assets, will not constitute more than 40% of our total mortgage-related assets at any time. Mortgage loans are acquired with the intention of securitizing them into high-credit quality mortgage securities. Despite our intentions, however, we may not be successful in securitizing these mortgage loans. To meet our investment criteria, mortgage loans acquired by us will generally conform to the underwriting guidelines established by Fannie Mae, Freddie Mac or to secondary market standards for “A” quality mortgage loans. Applicable banking laws generally require that an appraisal be obtained in connection with the original issuance of mortgage loans by the lending institution and we do not intend to obtain additional appraisals at the time of acquiring mortgage loans.

Mortgage loans are purchased from various suppliers of mortgage-related assets throughout the United States including savings and loans associations, banks, mortgage bankers and other mortgage lenders. We acquire mortgage loans directly from originators and from entities holding mortgage loans originated by others. Our board of directors has not established any limits upon the geographic concentration or the credit quality of suppliers of the mortgage-related assets that we acquire.

Other Investments.    We may acquire other investments that include equity and debt securities issued by other primarily mortgage-related finance companies, interests in mortgage-related collateralized bond obligations, other subordinated interests in pools of mortgage-related assets, commercial mortgage loans and securities, and residential mortgage loans other than high-credit quality mortgage loans. Although we expect that our other investments will be limited to less than 10% of total assets, we have no limit on how much of our stockholders’ equity will be allocated to other investments. There may be periods in which other investments represent a large portion of our stockholders’ equity.

Belvedere Trust Mortgage Corporation

Belvedere Trust’s Business.    Belvedere Trust is in the business of acquiring, owning and securitizing residential real estate loans, with a focus on high credit-quality jumbo adjustable-rate, hybrid and second-lien mortgages. Belvedere Trust, through taxable REIT subsidiaries, acquires mortgage loans from various originators and suppliers of mortgage-related assets throughout the United States, including savings and loan associations, banks, and mortgage bankers. Belvedere Trust has built relationships with and continues to expand upon a diversified network of mortgage loan originators. Belvedere Trust’s loan sourcing efforts determine the quality, consistency and volume of loans that it purchases. Belvedere Trust targets the types and attributes of the mortgage loans it seeks to acquire and holds these mortgage loans until a sufficient quantity has been accumulated for securitization into high-quality mortgage-backed securities.

Our Strategy for Belvedere Trust

Operating Strategy.    Our operating strategies for Belvedere Trust include:

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We believe our strategy for Belvedere Trust currently provides it with certain competitive advantages, including:

Financing Strategy.    Belvedere Trust leverages its capital allocated to whole-loan investment by borrowing funds through short-term and long-term secured debt facilities. Our goal for Belvedere Trust is to use leverage prudently, as dictated by our integrated risk management strategy, to enhance spread income and returns to stockholders. The cornerstone of our long-term whole loan finance strategy is securitization of our whole loans. Securitization materially limits liquidity risks and potentially maximizes risk-adjusted returns on capital.

To facilitate the financing of some of the mortgage-related assets which Belvedere Trust owns, they had in place, at December 31, 2004, a variety of short-term borrowing arrangements, including repurchase agreements with five dealers. At December 31, 2004, we also had three whole loan credit facilities with credit limits totaling $850 million. When we purchase whole loans, we typically fund them through one of these warehouse facilities. We have implemented a program to hedge select warehouse loans with Eurodollar futures contracts until they have been priced as securities. The whole loans are kept in the warehouse facility where they earn a spread until they are securitized.

Securitization Activities

Belvedere Trust is a qualified REIT subsidiary, but structures securitization transactions primarily through taxable REIT subsidiaries (which generally are taxed as C corporations subject to full corporation taxation) which in turn establish special purpose entities, or SPE, that issue securities through real estate mortgage investment conduit, or REMIC, trusts. The principal business activity involves issuing various series of long-term debt (in the form of pass-through certificates or bonds collateralized by residential real estate loans). The collateral specific to each long-term debt series is the sole source of repayment of the debt and, therefore, our exposure to loss is limited to our net investment in the collateral.

In January 2003, the Financial Accounting Standards Board, or FASB, issued FASB Interpretation No. 46, “Consolidation of Variable Interest Entities, an Interpretation of ARB No. 51” (FIN 46). In December 2003, FASB issued FIN No. 46R which replaced FIN 46 and clarified ARB 51. This interpretation provides guidance on how to identify a variable interest entity, or VIE, and when a company should include in its financial statements the assets, liabilities and activities of a VIE. Under FIN 46, a company must consolidate a VIE when it is considered to be its primary beneficiary. The primary beneficiary is the entity that will absorb a majority (50% or more) of the risk of expected losses and/or receive most of the expected residual benefit from taking on that risk. We disclose our interests in VIEs under FIN 46 in the “Investments in Residential Real Estate Loans” footnote.

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Belvedere Trust sells a portion of the mortgage-backed securities to third parties in the secondary market, while retaining the balance. The mortgage-backed securities retained by Belvedere Trust are purchased by one of our qualified REIT subsidiaries to maximize tax efficiency on the interest income on those securities. Belvedere Trust has, to date, retained the majority of the subordinate securities and certain of the senior securities from its securitizations. From its formation through December 31, 2004, Belvedere Trust had securitized a total of $2.4 billion of mortgage loans. Through December 31, 2004, mortgage-backed securities with an initial balance of approximately $1.8 billion had been sold to third parties. The balance, $635 million of original principal, was retained by a qualified REIT subsidiary of Belvedere Trust. Some of the securities retained by Belvedere Trust have been financed with short-term borrowings.

On September 10, 2004, the SEC declared effective a shelf registration statement on Form S-3 filed by Belvedere Trust’s wholly-owned direct and indirect subsidiaries, BellaVista Finance Corporation and BellaVista Funding Corporation, as co-registrants. This registration statement registered for sale to the public up to $2 billion in asset-backed securities. On October 28, 2004, BellaVista Funding Corporation completed the first securitization on this registration statement by issuing approximately $608.1 million of mortgage-backed securities backed by adjustable-rate and hybrid mortgage loans. On December 17, 2004, BellaVista Funding Corporation completed the second securitization by issuing approximately $492 million of mortgage-backed securities backed by adjustable-rate mortgage loans. These mortgage loans were purchased by BellaVista Funding Corporation from Belvedere Trust Finance Corporation, another of Belvedere Trust’s wholly-owned subsidiaries.

During the three months ended March 31, 2004, Belvedere Trust transferred approximately $253.0 million of residential mortgage loans to a securitization trust, which was a qualified SPE, pursuant to a pooling and third party servicing agreement. During the three months ended June 30, 2004, Belvedere Trust transferred approximately $659.0 million of residential mortgage loans in two separate transactions to securitization trusts, which were non-qualified SPEs, pursuant to pooling and third party servicing agreements. During the three months ended September 30, 2004, Belvedere Trust transferred approximately $391.0 million of residential mortgage loans to a securitization trust, which was a non-qualified SPE, pursuant to a pooling and third party servicing agreement. During the three months ended December 31, 2004, Belvedere Trust transferred approximately $1.1 billion of residential mortgage loans in two separate transactions to securitization trusts, which were non-qualified SPEs, pursuant to pooling and third party servicing agreements.

Management Agreement

Belvedere Trust has entered into a management agreement with BT Management Company, L.L.C., or BT Management, a Delaware limited liability company that is owned 50% by Anworth and 50% by the executive officers of Belvedere Trust. Pursuant to the management agreement, BT Management manages the day-to-day operations of Belvedere Trust in exchange for an annual base management fee and a quarterly incentive fee. The annual base management fee is equal to 1.15% of the first $300.0 million of average net invested assets, plus 0.85% of the portion above $300.0 million. The incentive fee for each fiscal quarter is equal to 20% of the amount of net income of Belvedere Trust, before incentive compensation, for such quarter in excess of the amount that would produce an annualized return on equity equal to the Ten-Year U.S. Treasury Rate for such fiscal quarter plus 1%.

The management agreement requires that Belvedere Trust pay all amounts earned thereunder each quarter, subject to offset for accrued negative incentive compensation. For the year ended December 31, 2004, Belvedere Trust paid BT Management incentive compensation of $714,000.

Competition

When we invest in mortgage-backed securities, mortgage loans and other investment assets, we compete with a variety of institutional investors including other REITs, insurance companies, mutual funds, pension funds, investment banking firms, banks and other financial institutions that invest in the same types of assets. Many of these investors have greater financial resources and access to lower costs of capital than we do.

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Employees

As of December 31, 2004, Anworth had eleven employees, seven of whom were part-time, and Belvedere Trust had six full-time employees.

Company Information

We were incorporated in Maryland on October 20, 1997 and commenced our operations on March 17, 1998. Our principal executive offices are located at 1299 Ocean Avenue, Suite 250, Santa Monica, California, 90401. Our telephone number is (310) 255-4493 and our fax number is (310) 434-0070.

Information on our Company Website

Our website address is www.anworth.com. We make 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 with the Securities and Exchange Commission. In addition, we post the following information on our website:

All of the above information is also available in print upon request to our secretary at the address listed under the heading “Company” above.

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CERTAIN FEDERAL INCOME TAX CONSIDERATIONS

The following discussion summarizes particular United States federal income tax considerations regarding our qualification and taxation as a REIT and particular United States federal income tax consequences resulting from the acquisition, ownership and disposition of our capital stock. This discussion is based on current law and assumes that we have qualified at all times throughout our existence, and will continue to qualify, as a REIT for United States federal income tax purposes. The tax law upon which this discussion is based could be changed, and any such change could have a retroactive effect. The following discussion is not exhaustive of all possible tax considerations. This summary neither gives a detailed discussion of any state, local or foreign tax considerations nor discusses all of the aspects of United States federal income taxation that may be relevant to you in light of your particular circumstances or to particular types of stockholders which are subject to special tax rules, such as insurance companies, tax-exempt entities, financial institutions or broker-dealers, foreign corporations or partnerships, and persons who are not citizens or residents of the United States, stockholders that hold our stock as a hedge, part of a straddle, conversion transaction or other arrangement involving more than one position, or stockholders whose functional currency is not the United States dollar. This discussion assumes that you will hold our capital stock as a “capital asset,” generally property held for investment, under the tax code.

In reading the federal income tax disclosure below, it should be noted that although Anworth is combined with all of its wholly-owned subsidiaries for financial accounting and reporting purposes, for federal income tax purposes, only Anworth and its wholly-owned subsidiaries, Belvedere Trust Mortgage Corporation, BT Management Holding Corporation, Belvedere Trust Secured Assets Corporation and BellaVista Finance Corporation, constitute the REIT. Anworth’s remaining wholly-owned subsidiaries, Belvedere Trust Finance Corporation, BT Residential Funding Corporation and BellaVista Funding Corporation, constitute a separate consolidated group subject to regular income taxes.

We urge you to consult with your own tax advisor regarding the specific consequences to you of the acquisition, ownership and disposition of stock in an entity electing to be taxed as a REIT, including the federal, state, local, foreign and other tax considerations of such acquisition, ownership, disposition and election and the potential changes in applicable tax laws.

General

Our qualification and taxation as a REIT depends upon our ability to continue to meet the various qualification tests, imposed under the tax code and discussed below, relating to our actual annual operating results, asset diversification, distribution levels and diversity of stock ownership. Accordingly, the actual results of our operations for any particular taxable year may not satisfy these requirements.

We have made an election to be taxed as a REIT under the tax code commencing with our taxable year ended December 31, 1998. We currently expect to continue operating in a manner that will permit us to maintain our qualification as a REIT. All qualification requirements for maintaining our REIT status, however, may not have been or will not continue to be met.

So long as we qualify for taxation as a REIT, we generally will be permitted a deduction for dividends we pay to our stockholders. As a result, we generally will not be required to pay federal corporate income taxes on our net income that is currently distributed to our stockholders. This treatment substantially eliminates the “double taxation” that ordinarily results from investment in a corporation. Double taxation means taxation once at the corporate level when income is earned and once again at the stockholder level when this income is distributed. We will be required to pay federal income tax, however, as follows:

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To the extent that distributions exceed current and accumulated earnings and profits, they will constitute a return of capital, rather than dividend or capital gain income, and will reduce the basis for the stockholder’s stock with respect to which the distributions are paid or, to the extent that they exceed such basis, will be taxed in the same manner as gain from the sale of that stock. For purposes of determining whether distributions are out of current or accumulated earnings and profits, our earnings and profits will be allocated first to our preferred stock and then to our common stock. Therefore, depending on our earnings and profits, distributions with respect to our 8.625% Series A Cumulative Preferred Stock, or our Series A Preferred Stock, (as compared to distributions with respect to our common stock) are more likely to be treated as dividends than as return of capital or a distribution in excess of basis.

As a result of recent changes in the tax law, dividends paid by regular C corporations to stockholders other than corporations now are generally taxed at the rate applicable to long-term capital gains, which is a maximum of 15%, subject to certain limitations. Because we are a REIT, however, our dividends, including dividends paid on our Series A Preferred Stock, generally will continue to be taxed at regular ordinary income tax rates, except in limited circumstances that we do not contemplate.

We will be required to pay a 100% tax on any net income from prohibited transactions. Prohibited transactions are, in general, sales or other taxable dispositions of property, other than foreclosure property, held primarily for sale to customers in the ordinary course of business. Under existing law, whether property is held as inventory or primarily for sale to customers in the ordinary course of a trade or business depends on all the facts and circumstances surrounding the particular transaction.

If we fail to satisfy the 75% gross income test or the 95% gross income test discussed below, but nonetheless maintain our qualification as a REIT because certain other requirements are met, we will be subject to a tax equal to:

In the event of more than de minimis failure of any of the asset tests occurs in a taxable year after 2004, as long as the failure was due to reasonable cause and not to willful neglect and we dispose of the assets or otherwise comply with the asset tests within six months after the last day of the quarter in which we identify such failure, we will pay a tax equal to the greater of $50,000 or 35% of the net income from the non-qualifying assets during the period in which we failed to satisfy any of the asset tests.

In the event of a failure to satisfy one or more requirements for REIT qualification occurring in a taxable year after 2004, other than the gross income tests and the asset tests, as long as such failure was due to reasonable cause and not to willful neglect, we will be required to pay a penalty of $50,000 for each such failure.

We will be required to pay a nondeductible 4% excise tax on the excess of the required distribution over the amounts actually distributed if we fail to distribute during each calendar year at least the sum of:

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This distribution requirement is in addition to, and different from, the distribution requirements discussed below in the section entitled “Annual Distribution Requirements.”

We may elect to retain and pay income tax on our net long term capital gain. In that case, a United States stockholder would be taxed on its proportionate share of our undistributed long term capital gain (to the extent that we make a timely designation of such gain to the stockholder) and would receive a credit or refund of its proportionate share of the tax we paid.

If we own a residual interest in a REMIC, we will be taxable at the highest corporate rate on the portion of any excess inclusion income that we derive from the REMIC residual interests equal to the percentage of our stock that is held by “disqualified” organizations. Although the law is unclear, similar rules may apply if we own an equity interest in a taxable mortgage pool. To the extent that we own a REMIC residual interest in a taxable mortgage pool through a taxable REIT subsidiary, we will not be subject to tax. A “disqualified organization” includes:

If we acquire any asset from a corporation which is or has been taxed as a C corporation under the tax code in a transaction in which the basis of the asset in our hands is determined by reference to the basis of the asset in the hands of the C corporation and we subsequently recognize gain on the disposition of the asset during the ten-year period beginning on the date on which we acquired the asset, then we will be required to pay tax at the highest regular corporate tax rate on this gain to the extent of the excess of:

A C corporation is generally defined as a corporation required to pay full corporate-level tax. The results described in the preceding paragraph with respect to the recognition of gain will apply unless we make an election under Treasury Regulation Section 1.337(d)-7T(c). If such an election were made, the C corporation would recognize taxable gain or loss as if it had sold the assets we acquired from the C corporation to an unrelated third party at fair market value on the acquisition date.

We will be subject to a 100% excise tax if our dealings with any taxable REIT subsidiaries (defined below) are not at arm’s length.

In addition, not withstanding our REIT status, we may also have to pay certain state and local income taxes, because not all states and localities treat REITs in the same manner as they are treated for federal income tax purposes.

Requirements for Qualification as a REIT

The tax code defines a REIT as a corporation, trust or association:

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The tax code provides that all of the first four conditions stated above must be met during the entire taxable year and that the fifth condition must be met during at least 335 days of a taxable year of twelve months, or during a proportionate part of a taxable year of less than twelve months. The fifth and sixth conditions do not apply until after the first taxable year for which an election is made to be taxed as a REIT.

For purposes of the sixth condition, pension trusts and other specified tax-exempt entities generally are treated as individuals, except that a “look-through” exception generally applies with respect to pension funds.

Stock Ownership Tests

Our stock must be beneficially held by at least 100 persons, the “100 Stockholder Rule,” and no more than 50% of the value of our stock may be owned, directly or indirectly, by five or fewer individuals at any time during the last half of the taxable year, the “5/50 Rule.” For purposes of the 100 Stockholder Rule only, trusts described in Section 401(a) of the tax code and exempt under Section 501(a) of the tax code are generally treated as persons. These stock ownership requirements must be satisfied in each taxable year other than the first taxable year for which an election is made to be taxed as a REIT. We are required to solicit information from certain of our record stockholders to verify actual stock ownership levels and our charter provides for restrictions regarding the transfer of our stock in order to aid in meeting the stock ownership requirements. If we were to fail either of the stock ownership tests, we would generally be disqualified from our REIT status. However, if we comply with regulatory rules pursuant to which we are required to send annual letters to holders of our stock requesting information regarding the actual ownership of our stock, and we do not know, or exercising reasonable diligence would not have known, whether we failed to meet the 5/50 Rule, we will be treated as having met the 5/50 Rule.

Income Tests

We must satisfy two gross income requirements annually to maintain our qualification as a REIT:

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Gross income from servicing loans for third parties and loan origination fees is not qualifying income for purposes of either gross income test. Gross income from our sale of property that we hold primarily for sale to customers in the ordinary course of business is excluded from both the numerator and the denominator in both income tests. Beginning with our taxable year that started on January 1, 2005, income and gain from certain transactions that we enter into to hedge indebtedness incurred or to be incurred to acquire or carry real estate assets and that are clearly and timely identified as such are excluded from both the numerator and denominator for purposes of the 95% gross income test (but not the 75% gross income test).

For purposes of the 75% and 95% gross income tests, a REIT is deemed to have earned a proportionate share of the income earned by any partnership, or any limited liability company treated as a partnership for federal income tax purposes, in which it owns an interest, which share is determined by reference to its capital interest in such entity, and is deemed to have earned the income earned by any qualified REIT subsidiary (in general, a 100%-owned corporate subsidiary of a REIT). Our qualified REIT subsidiary, BT Management Holding Corporation, a Delaware corporation, owns a 50% interest in the profits, losses and capital of BT Management Company, L.L.C., a Delaware limited liability company which is taxed as a partnership for federal income tax purposes. Belvedere Trust Mortgage Corporation, or Belvedere Trust, our wholly-owned mortgage subsidiary, has entered into a management agreement with BT Management Company which manages Belvedere Trust’s investments and performs administrative services for Belvedere Trust. So long as BT Management Holding Corporation is a qualified REIT subsidiary of ours and it owns an interest in BT Management Company, we will be treated, for federal income tax purposes, as directly owning BT Management Holding Corporation’s proportionate share of the assets, liabilities and income of BT Management Company for purposes of determining our compliance with the REIT qualification tests. Certain of BT Management Company’s gross income (for example, management fee income under the management agreement with Belvedere Trust) will not be qualifying income under the 75% or 95% tests described above. Accordingly, we may decide to make a taxable REIT subsidiary election for BT Management Holding Corporation in the future if we believe that such non-qualifying income will jeopardize our ability to satisfy the 75% or 95% income tests. If we make a taxable REIT subsidiary election for BT Management Holding Corporation, its proportionate share of BT Management Company’s gross income will not be treated as our gross income for purposes of our REIT qualification tests, but BT Management Holding Corporation’s taxable income will be subject to corporate level income tax. Any dividends paid to us by BT Management Holding Corporation while it is a taxable REIT subsidiary will be qualifying income for purposes of our satisfaction of the 95% income test, but not the 75% test. Interest earned by a REIT ordinarily does not qualify as income meeting the 75% or 95% gross income tests if the determination of all or some of the amount of interest depends in any way on the income or profits of any person. Interest will not be disqualified from meeting such tests, however, solely by reason of being based on a fixed percentage or percentages of receipts or sales.

The following paragraphs discuss in more detail the specific application of the gross income tests to us.