<PAGE>
 
================================================================================

                   U. S. SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM 10-Q

                            ______________________

(Mark One)
[X]       QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES
          EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1999

[_]       TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES
          EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM _______________ TO
          ______________

                         Commission File No. 001-13709
                            ______________________

                      ANWORTH MORTGAGE ASSET CORPORATION
            (Exact name of Registrant as specified in its charter)

              MARYLAND                                  52-2059785
   (State or other jurisdiction of                   (I.R.S. Employer
   incorporation or organization)                   Identification No.)

       1299 Ocean Avenue, #200
          Santa Monica, CA                                90401
(Address of principal executive offices)                (Zip Code)

      Registrant's telephone number, including area code: (310) 394-0115
                            ______________________

Check whether the issuer (1) filed all reports required to be filed by Section
13 or 15(d) of the Exchange Act during the past 12 months (or for such shorter
period that the registrant was required to file such reports), and (2) has been
subject to such filing requirements for the past 90 days.  Yes  X   No 
                                                               ---     ---

As of March 31, 1999, 2,291,300 shares of Common Stock, $0.01 par value per
share were issued and outstanding.

                            ______________________

================================================================================
<PAGE>
 
                                     INDEX
                                     -----

<TABLE>
<CAPTION>
Part I.  Financial Information                                                                      Page
------   ---------------------                                                                      ----
<S>                                                                                                 <C> 
Item 1.    Financial Statements

                Balance Sheets at March 31, 1999 and March 31, 1998.................................  3
 
                Statements of Operations for the three months ended March 31, 1999 and for the
                period March 17, 1998 (Commencement of Operations) to March 31, 1998................  4
 
                Statement of Stockholders' Equity for the three months March 31, 1999...............  5
 
                Statements of Cash Flows for the three months ended March 31, 1999 and for the
                period March 17, 1998 (Commencement of Operations) to March 31, 1998................  6
 
                Notes to the Financial Statements...................................................  7
 
Item 2.  Management's Discussion and Analysis of Financial Condition and Results of
         Operations................................................................................. 11

Part II. Other Information
-------  -----------------

Item 1.    Legal Proceedings ....................................................................... 24
 
Item 2.    Changes in Securities.................................................................... 24
 
Item 3.    Defaults upon Senior Securities.......................................................... 24
 
Item 4.    Submission of Matters to a Vote of Security Holders...................................... 24
 
Item 5.    Other Information........................................................................ 24
 
Item 6.    Exhibits and Reports on Form 8-K......................................................... 24
 
Signatures.......................................................................................... 25
</TABLE> 

                                     Page 2
<PAGE>
 
Part I.  FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

ANWORTH MORTGAGE ASSET 
CORPORATION
 
Balance Sheets

<TABLE> 
<CAPTION> 
                                                      March 31, 1999         December 31, 1998
                                                      --------------         -----------------
                                                       (unaudited)
<S>                                                   <C>                    <C> 
Assets                                            
  Mortgage backed securities                           $166,679,000             $184,245,000
  Other marketable securities                               490,000                  488,000
  Cash and cash equivalents                               2,888,000               13,299,000
  Accrued interest receivable                             1,210,000                1,411,000
  Prepaid expenses and other                                      -                   15,000
                                                       ------------             ------------ 
                                                       $171,267,000             $199,458,000
                                                       ============             ============
                                                                        
Liabilities and Stockholders Equity                                     
                                                                        
Liabilities                                                             
  Reverse repurchase agreements                        $141,320,000             $170,033,000
  Payable for purchase of mortgage-backed                10,001,000               10,047,000
securities                                                              
  Accrued interest payable                                1,569,000                1,799,000
  Dividends payable                                         275,000                  279,000
  Accrued expenses and other                                 90,000                   58,000
                                                       ------------             ------------ 
                                                        153,255,000              182,216,000
                                                       ------------             ------------ 
                                                                        
STOCKHOLDERS' EQUITY                                                    
                                                                        
  Preferred stock, par value $.01 per share;                            
    authorized 20,000,000 shares;                                       
    no shares issued and outstanding                              -                        -
  Common stock; par value $.01 per share;                               
    authorized 100,000,000 shares;  2,328,000 and                       
    2,291,300 issued and outstanding respectively            23,000                   23,000
  Additional paid in capital, net                        18,971,000               18,971,000
  Other comprehensive income, unrealized                                
    gain (loss) on available for sale securities           (839,000)              (1,775,000)
  Retained earnings                                          27,000                   23,000
  Treasury stock at cost (36,700 shares)                   (170,000)                       -
                                                       ------------             ------------ 
                                                         18,012,000               17,242,000
                                                       ------------             ------------ 
                                                       $171,267,000             $199,458,000
                                                       ============             ============
</TABLE> 
 
See notes to financial statements.
 

                                     Page 3
<PAGE>
 
ANWORTH MORTGAGE ASSET 
CORPORATION
Statements of Operations (unaudited)
 
<TABLE> 
<CAPTION> 
                                                                   Period from
                                                                  March 17, 1998
                                            Three months          (Commencement
                                                ended           of Operations) to
                                           March 31, 1999         March 31, 1998
<S>                                        <C>                  <C> 
Interest and dividend income net of
  amortization of premium                    $2,404,000            $   73,000
Interest expense                              2,036,000                42,000
                                             ----------            ---------- 
                                                            
Net interest income                          $  368,000            $   31,000
                                                            
Expenses:                                                   
  Management fee                                 44,000                 7,000
  Incentive fee                                       -                     -
  Other expense                                  46,000                 8,000
                                             ----------            ---------- 
Net Income                                   $  278,000            $   16,000
                                             ==========            ========== 
                                                            
Basic and diluted earnings per share         $     0.12            $     0.01
                                             ==========            ========== 
                                                            
Dividends declared per share                 $     0.12            $     0.00
                                             ==========            ========== 
                                                            
Average number of shares outstanding          2,320,172             2,200,100
                                             ==========            ========== 
</TABLE> 
 
See notes to financial statements.
 

                                     Page 4
<PAGE>
 
ANWORTH MORTGAGE ASSET CORPORATION
 
Statement of Stockholders' Equity
Three Months Ended March 31, 1999

<TABLE> 
<CAPTION> 
                                                                  Accum.
                                                                  Other                                    Other
                          Common      Common     Additional      Compre-                    Treasury      Compre-
                          Stock        Stock       Paid-in       hensive       Retained       Stock       hensive
                          Shares     Par Value     Capital        Income       Earnings      at Cost       Income        Total
                     ------------------------------------------------------------------------------------------------------------
<S>                     <C>          <C>         <C>           <C>            <C>          <C>           <C>          <C>
Balance, December   
 31, 1998               2,328,000      $23,000   $18,971,000   $(1,775,000)   $  23,000     $       -                 $17,242,000 
  Issuance of common 
   stock                                     -             -                                                                    -
  Available-for-sale 
   securities, Fair 
   value adjustment                                                936,500                                  936,500       936,500
  Net income                                                                    278,500                     278,500       278,500
                                                                                                         ----------
                                                                                                         $1,215,000
                                                                                                         ==========
  Repurchase of           (36,700)                                                           (170,000)                   (170,000)
   common stock
  Dividends declared-
    $0.12 per share                                                            (275,000)                                 (275,000)
                     --------------------------------------------------------------------------------                 -----------
Balance, March 31, 
 1999                   2,291,300      $23,000   $18,971,000   $  (838,500)   $  26,500     $(170,000)                $18,012,000 
                     ================================================================================                 ===========
</TABLE> 
 
See notes to financial statements.
 

                                     Page 5
<PAGE>
 
ANWORTH MORTGAGE ASSET CORPORATION
 
Statements of Cash Flows
 
<TABLE> 
<CAPTION> 
                                                                For the three months ended March 31,
                                                                    1999                  1998
                                                                ------------          ------------
<S>                                                             <C>                   <C> 
Operating Activities:
  Net income                                                    $    278,000          $     16,000
  Adjustments to reconcile net income to                                        
  net cash provided by operating activites:                                     
    Amortization                                                     518,000                 5,000
    Decrease (increase) in accrued interest receivable               194,000              (696,000)
    Decrease (increase) in deferred organization expense                   -               (12,000)
    Increase (decrease) in accrued interest payable                 (229,000)               42,000
    Increase (decrease) in accrued expenses and other                 51,000                27,000
                                                                ------------          ------------ 
        Net cash provided by operating activities                    812,000              (618,000)
                                                                                
Investing Activities:                                                           
  Available-for-sale securities:                                                
    Purchases                                                        (46,000)          (88,680,000)
    Principal payments                                            17,981,000                     -
                                                                ------------          ------------ 
        Net cash (used in) investing activities                   17,935,000           (88,680,000)
                                                                                
Financing Activities:                                                           
  Net borrowings from reverse repurchase agreements              (28,713,000)           83,507,000
  Proceeds from common stock issued, net                                   -            18,381,000
  Repurchase of common stock                                        (170,000)   
  Dividends paid                                                    (275,000)                    -
                                                                ------------          ------------ 
        Net cash provided by financing activities                (29,158,000)          101,888,000
                                                                ------------          ------------ 
Net increase (decrease) in cash and cash equivalents             (10,411,000)           12,590,000
Cash and cash equivalents at beginning of period                  13,299,000                 1,000
                                                                ------------          ------------ 
Cash and cash equivalents at end of period                      $  2,888,000          $ 12,591,000
                                                                ============          ============
</TABLE> 
 
See notes to financial statements.
 

                                     Page 6
<PAGE>
 
ANWORTH MORTGAGE ASSET CORPORATION

NOTES TO FINANCIAL STATEMENTS
March 31, 1999

NOTE 1.   ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES

Anworth Mortgage Asset Corporation (the "Company") was incorporated in Maryland
on October 20, 1997.  The Company commenced its operations of purchasing and
managing an investment portfolio of primarily adjustable-rate mortgage-backed
securities on March 17, 1998, upon completion of its initial public offering of
the Company's common stock.

A summary of the company's significant accounting policies follows:

BASIS OF PRESENTATION

The accompanying unaudited condensed financial statements have been prepared in
accordance with generally accepted accounting principles for interim financial
information and with the instructions to Form 10-Q and Rule 10-01 of Regulation
S-X.  Therefore, they do not include all of the information and footnotes
required by generally accepted accounting principles for complete financial
statements.

In the opinion of management, all material adjustments, consisting of normal
recurring adjustments, considered necessary for a fair presentation have been
included. The operating results for the quarter ended March 31, 1999 are not
necessarily indicative of the results that may be expected for the calendar year
ending December 31, 1999.

CASH AND CASH EQUIVALENTS

Cash and cash equivalents include cash on hand and highly liquid investments
with original maturities of twelve months or less.  The carrying amount of cash
equivalents approximates their fair market value.

MORTGAGE BACKED SECURITIES

The Company invests primarily in adjustable-rate mortgage pass-through
certificates and hybrid adjustable-rate mortgage-backed securities ("ARM"
securities).  Hybrid ARM securities have an initial interest rate that is fixed
for a certain period, usually three to five years, and then adjusts annually for
the remainder of the term of the loan.

Statement of Financial Accounting Standards No. 115, Accounting for Certain
Investments in Debt and Equity Securities ("SFAS 115"), requires the Company to
classify its investments as either trading investments, available-for-sale
investments or held-to-maturity investments.  It is the Company's policy to
classify each of its ARM securities as available-for-sale and then to monitor
the security's performance over time before making a final determination as to
the 

                                     Page 7
<PAGE>
 
permanent classification. At this time all of the Company's ARM securities are
classified as available-for-sale. All assets that are classified as available-
for-sale are carried at fair market value.

Interest income is accrued based on the outstanding principal amount of the ARM
securities and their contractual terms.  Premiums associated with the purchase
of ARM securities are amortized into interest income over the estimated lives of
the asset using the effective yield method.

ARM securities are recorded on the date the securities are purchased or sold.

CREDIT RISK

At March 31, 1999 the Company has limited its exposure to credit losses on its
portfolio of ARM securities by purchasing primarily securities from Federal Home
Loan Mortgage Corporation ("FHLMC") and Federal National Mortgage Association
("FNMA").  The payment of principal and interest on the FHLMC and FNMA ARM
securities are guaranteed by those respective agencies.  At March 31, 1999, all
of the Company's ARM securities have an implied "AAA" rating.

INCOME TAXES

The Company intends to elect to be taxed as a Real Estate Investment Trust and
to comply with the provisions of the Internal Revenue Code with respect thereto.
Accordingly, the Company will not be subject to Federal income tax to the extent
that its distributions to stockholders satisfy the REIT requirements.

EARNINGS PER SHARE

Basic EPS is computed by dividing net income by the weighted average number of
common shares outstanding during the period.  Diluted EPS assumes the
conversion, exercise or issuance of all potential common stock equivalents
unless the effect is to reduce a loss or increase the income per share.  Stock
options that could potentially dilute basic EPS in the future were not included
in the computation of diluted EPS because to do so would have been antidilutive.

USE OF ESTIMATES

The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.

NOTE 2.  MORTGAGE BACKED SECURITIES

                                     Page 8
<PAGE>
 
The following table pertains to the Company's ARM securities classified as
available-for-sale as of March 31, 1999, which are carried at their fair value:

<TABLE>
<CAPTION>
                                      Federal               Federal
                                     Home Loan             National             Other         Total
                                     Mortgage              Mortgage              ARM           ARM
                                    Corporation           Association          Assets         Assets
-----------------------------------------------------------------------------------------------------
<S>                                 <C>                   <C>                  <C>           <C>
   Amortized Cost ($000's)            $38,326              $117,992               $0         $156,318
   Unrealized gains (losses)             (228)                 (468)               0             (696)
                                      ---------------------------------------------------------------
   Estimated fair value               $38,098              $117,524               $0         $155,622
                                      ---------------------------------------------------------------
</TABLE>
                                                                                
In addition, at March 31, 1999 the Company held a position in a preferred stock
issued by Thornburg Mortgage Asset Corporation and a position in a fixed-rate
mortgage backed security, which had fair values of  $490,000 and $9,952,000
respectively.  The remaining portion of the mortgage backed securities consisted
of a principal payments receivable of $1,107,000.

The following table summarizes the Company's securities as of March 31, 1999 at
their fair value:

<TABLE>
<CAPTION>
                                                          Fixed                  REIT
                                                          Rate                Preferred
                                      ARMS                 MBS                  Stock            Total
-------------------------------------------------------------------------------------------------------
<S>                                 <C>                  <C>                  <C>              <C>
Amortized Cost ($000's)             $156,318             $10,120                $464           $166,902
Unrealized gains                                                                  26                 26
Unrealized losses                       (696)               (170)                                  (866)
                                    -------------------------------------------------------------------
Estimated fair value                $155,622             $ 9,950                $490           $166,062
                                    -------------------------------------------------------------------
</TABLE>
                                                                                
NOTE 3.  REVERSE REPURCHASE AGREEMENTS

The Company has entered into reverse repurchase agreements to finance most of
its ARM securities.  The reverse repurchase agreements are short-term borrowings
that are secured by the market value of the Company's ARM securities and bear
interest rates that have historically moved in close relationship to LIBOR.

At March 31, 1999, the repurchase agreements had the following remaining
maturities:

<TABLE>
<S>                                             <C>
------------------------------------------------------------
   Within 59 days                               $ 61,280,571
   60 to 89 days                                  13,570,364
   90 to 119 days                                 26,268,309
   Over 120 days                                  40,201,000
                                                ------------
                                                $141,320,244
                                                ------------
</TABLE>

NOTE 4.  INITIAL PUBLIC OFFERING

                                     Page 9
<PAGE>
 
On March 12, 1998 the Company completed its initial public offering of common
stock, $0.01 par value.  The Company issued 2,200,000 shares of common stock at
a price of $9 per share and received net proceeds of  $18,414,000, net of
underwriting discount of $0.63 per share.  Offering costs in connection with the
public offering, including the underwriting discount and other expenses, which
total $491,182, have been charged against the proceeds of the offering.  Prior
to March 17, 1998, the Company had no operations other than activities relating
to its organization, registration under the Securities Act of 1933 and the
issuance of 100 shares of its common stock to its initial shareholder.

The Company granted the underwriters of the initial public offering of the
Company's common stock a 30-day option to purchase additional shares of common
stock solely to cover over-allotments, if any, at the public offering price of
$9 per share.  On April 14, 1998, the underwriters purchased an additional
127,900 shares under the terms of this option.  As a result, the Company
received additional net proceeds of $1,070,523, net of the underwriting discount
of $0.63 per share, on April 14, 1998, which is reflected in the accompanying
financial statements.

NOTE 5.  TRANSACTIONS WITH AFFILIATES

The Company entered into a Management Agreement (the "Agreement") with Anworth
Mortgage Advisory Corporation (the "Manager"), effective March 12, 1998.  Under
the terms of the Agreement, the Manager, subject to the supervision of the
Company's Board of Directors, is responsible for the management of the day-to-
day operations of the Company and provides all personnel and office space.

The Company pays the Manager an annual base management fee equal to 1% of the
first $300 million of Average Net Invested Assets (as defined in the Agreement),
plus 0.8% of the portion above $300 million (the "Base Management
Compensation").

In addition to the Base Management Compensation, the Manager shall receive as
incentive compensation for each fiscal quarter an amount equal to 20% of the Net
Income of the Company, before incentive compensation, for such fiscal quarter in
excess of the amount that would produce an annualized Return on Equity
(calculated by multiplying the Return on Equity for such fiscal quarter by four)
equal to the Ten-Year U.S. Treasury Rate for such fiscal quarter plus 1% (the
"Incentive Management Compensation").

For the quarter ended March 31, 1999 and for the period from March 17, 1998
(commencement of operations) to March 31, 1998, the Company paid the Manager
$44,000 and $7,000, respectively, in base management fee.

The Company  has adopted the Anworth Mortgage Asset Corporation 1997 Stock
Option and Awards Plan (the "Stock Option Plan") which authorizes the grant of
options to purchase an aggregate of up to 300,000 of the outstanding shares of
the company's Common Stock.  The plan authorizes the Board of Directors, or a
committee of the Board of Directors, to grant incentive stock options ("ISOs")
as defined under section 422 of the Internal Revenue Code of 1986, as 

                                    Page 10
<PAGE>
 
amended, options not so qualified ("NQSOs"), dividend equivalent rights ("DERs")
and stock appreciation rights ("SARs"). The exercise price for any option
granted under the Stock Option Plan may not be less than 100% of the fair market
value of the shares of Common Stock at the time the option is granted. As of
March 31, 1999, the Company had granted 148,000 options at an exercise price of
$9 per share and 136,000 DERs. Options granted to officers become exercisable at
a rate of 33.3% each year following their date of grant. Options granted to
directors become exercisable six months after their date of grant. These options
will expire on March 11, 2008. The DER's are payable only when their associated
stock options are exercised, thereby reducing the effective strike price of such
options. The Company will recognize compensation expense at the time the average
market price of the stock exceeds the effective strike price. The Company has
not yet recognized any compensation expense related to the DER's because the
current market price of the common stock is substantially less than the
effective strike price. In April 1999, the Company granted an additional 50,000
options and an additional 12,500 DER's. These options will vest three years from
the date of grant and will expire on April 17, 2009.

For the quarter ended March 31, 1999, the Company recorded no operating expense
associated with this plan.


NOTE 6.  SHARE REPURCHASE

In December of 1998, the Board of Directors authorized the repurchase of 50,000
shares of the Company's common stock.  As of March 31, 1999, 36,700 shares had
been repurchased at an average cost of $4.63 per share.


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

Certain information contained in this Quarterly Report on Form 10-Q constitutes
"Forward-Looking Statements" within the meaning of Section 27A of the Securities
Act of 1933, as amended, and Section 21E of the Exchange Act, which can be
identified by the use of forward-looking terminology such as "may," "will,"
"expect," "anticipate," "estimate," or "continue" or the negatives thereof or
other variations thereon or comparable terminology. Investors are cautioned that
all forward-looking statements involve risks and uncertainties including, but
not limited to, risks related to the future level and relationship of various
interest rates, prepayment rates and the timing of new programs. The statements
in the "Risk Factors" of the Company's Prospectus dated March 12, 1998
constitute cautionary statements identifying important factors, including
certain risks and uncertainties, with respect to such forward-looking statements
that could cause the actual results, performance or achievements of the Company
to differ materially from those reflected in such forward-looking statements.

GENERAL

                                    Page 11
<PAGE>
 
Anworth Mortgage Asset Corporation (the "Company") was formed in October 1997 to
invest in mortgage assets, including mortgage pass-through certificates,
collateralized mortgage obligations, mortgage loans and other securities
representing interests in, or obligations backed by, pools of mortgage loans
which can be readily financed and short-term investments (collectively,
Mortgage-Backed Securities).

The Company's principal business objective is to generate net income for
distribution to stockholders from the spread between the interest income on its
Mortgage-Backed Securities and the costs of borrowing to finance its acquisition
of Mortgage-Backed Securities.  The Company commenced operations on March 17,
1998 upon the closing of its initial public offering.  Since that date the
Company has been in the process of deploying its capital and building its
balance sheet through the acquisition of mortgage assets and the financing of
those assets in the credit markets.  The Company seeks to generate income
through its use of leverage and active management of the asset/liability yield
spread.  The financial statements included in this quarterly report on Form 10-Q
should be interpreted in light of this growth process and are not necessarily
representative of what they may be in the future.

The Company will seek to generate growth in earnings and dividends per share in
a variety of ways, including through (i) issuing new Common Stock and increasing
the size of the balance sheet when opportunities in the market for Mortgage-
Backed Securities are likely to allow growth in earnings per share, (ii) seeking
to improve productivity by increasing the size of the balance sheet at a rate
faster than the rate of increase in operating expenses, (iii) continually
reviewing the mix of Mortgage-Backed Security types on the balance sheet in an
effort to improve risk-adjusted returns, and (iv) attempting to improve the
efficiency of the Company's balance sheet structure through the issuance of
uncollateralized subordinated debt, preferred stock and other forms of capital,
to the extent management deems such issuances appropriate.

The Company is organized for tax purposes as a real estate investment trust
("REIT") and therefore generally passes through substantially all of its
earnings to stockholders without paying federal or state income tax at the
corporate level.

The Company's investment policy is to invest at least 70% of total assets in
"Primary" adjustable-rate Mortgage Securities and Short-Term Investments
(investments with an average life of one year or less).  "Primary" as used
herein 

                                    Page 12
<PAGE>
 
means either (i) securities that are rated within one of the two highest rating
categories by at least one of either Standard & Poor's or Moody's, or (ii)
securities that are unrated but are either obligations of the United States or
obligations guaranteed by the United States government or an agency or
instrumentality of the United States government.

The remainder of the Company's investment portfolio, comprising not more than
30% of its total assets, may consist of mortgage assets which are unrated, or,
if rated, are less than Primary, including (i) mortgage loans secured by first
liens on single-family (one-to-four units) residential properties, (ii) mortgage
securities backed by loans on single-family, multi-family, commercial or other
real estate-related properties which are rated at least Investment Grade (rated
at least "BBB" or "Baa" by Standard & Poor's or Moody's, respectively) or (as to
single-family and multi-family Mortgage Securities) the equivalent, if not
rated, (iii) fixed-rate mortgage assets, including the acquisition of such
assets for the purpose of being combined with hedging instruments to obtain
investment characteristics similar to adjustable-rate mortgage assets, and (iv)
other mortgage securities representing interests in, or secured by mortgages on,
real property.  The Company may also generate qualified REIT income through
investment in other REITs.

The Company will generally not acquire inverse floaters, Remic residuals or
first loss subordinated bonds.  The Company may acquire mortgage derivative
securities, including, but not limited to, interest only, principal only or
other mortgage securities that receive a disproportionate share of interest
income or principal, either as an independent stand-alone investment opportunity
or to assist in the management of prepayment and other risks, but only on a
limited basis due to the greater risk of loss associated with mortgage
derivative securities.

FINANCIAL CONDITION

At March 31, 1999, the Company held total assets of $171 million, consisting
primarily of $156 million of ARM securities, $10 million of fixed-rate mortgage-
backed securities and $.5 million of REIT preferred stock.  At March 31, 1999,
94% of the qualified real estate assets held by the Company were Primary assets.
Of the ARM securities owned by the Company, 82% were adjustable-rate pass-
through certificates which reset at least once a year.  The remaining 18% were
3/1 and 5/1 hybrid ARMS with an average reset of 3.8 years.  Hybrid ARM
securities have an initial interest rate that is fixed for a certain period,
usually three to five years, and then adjust annually for the remainder of the
term of the loan.

                                    Page 13
<PAGE>
 
The following table presents a schedule of ARM securities owned at March 31,
1999 classified by type of issuer.

ARM SECURITIES BY ISSUER
(Dollar amounts in thousands)

<TABLE>
<CAPTION>
-----------------------------------------------------------------
Agency                             Carrying            Portfolio 
                                    Value              Percentage 
-----------------------------------------------------------------
<S>                                <C>                 <C>
FNMA                               $117,524                76
-----------------------------------------------------------------
FHLMC                                38,098                24
-----------------------------------------------------------------
  Total Portfolio                  $155,622               100
=================================================================
</TABLE>

The following table classifies the Company's portfolio of ARM securities by type
of interest rate index.

ARM ASSETS BY INDEX
(Dollar amounts in thousands)

<TABLE>
<CAPTION>
-------------------------------------------------------------- 
Index                         Carrying              Portfolio
                               Value                Percentage
-------------------------------------------------------------- 
<S>                           <C>                   <C> 
Six-month LIBOR              $ 12,541                   8.1%
--------------------------------------------------------------
Six-month Certificate of                     
   Deposit                      7,202                   4.6%
--------------------------------------------------------------
One-year Constant                            
  Maturity Treasury           129,518                  83.2%
-------------------------------------------------------------- 
Cost of Funds Index             6,361                   4.1%
--------------------------------------------------------------
                              155,622                 100.0%
==============================================================
</TABLE>

The ARM portfolio had a weighted average coupon of 7.08% at March 31, 1999.  The
weighted average one-month constant prepayment rates ("CPR") of the Company's
MBS portfolio were 34%, 33% and 28%, respectively, for the months of January,
February and March, 1999.  At March 31, 1999 the unamortized net premium paid
for the mortgage-backed securities was $4,071,000.

                                    Page 14
<PAGE>
 
The Company analyzes its mortgage-backed securities and the extent to which
prepayments impact the yield of the securities.  When actual prepayments exceed
expectations, the Company amortizes the premiums paid on mortgage assets over a
shorter time period, resulting in a reduced yield to maturity on the Company's
mortgage assets. Conversely, if actual prepayments are less than the assumed
constant prepayment rate, the premium would be amortized over a longer time
period, resulting in a higher yield to maturity. The Company monitors its yield
expectations versus its actual prepayment experience on a monthly basis in order
to adjust the amortization of the net premium.

The fair value of the Company's portfolio of mortgage-backed securities
classified as available-for-sale was $.87 million less than the amortized cost
of the securities, resulting in a negative adjustment of .52% of the amortized
cost of the portfolio as of March 31, 1999, a significant improvement over the
$1.8 million negative adjustment at December 31, 1998. This price improvement
reflects the possibility of slower future prepayments which would have the
effect of extending the average life of the Company's ARM securities and
increasing their yield and market value.


RESULTS OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH 31, 1999

For the quarter ended March 31, 1999, the Company's net income was $278,000, or
$0.12 per share (basic and diluted EPS), based on an average of 2,320,172
average shares outstanding.  Net interest income for the quarter totaled
$368,000.  Net interest income is comprised of the interest income earned on
mortgage investments less interest expense from borrowings.  During the first
quarter of 1999, the Company incurred operating expenses of $90,000, consisting
of a base management fee of $44,000 and other operating expenses of $46,000.
The Company commenced operations on March 17, 1998, therefore comparing results
of operations to the period ended March 31, 1998 is not meaningful because the
1998 period was comprised of only 15 days.

The Company's return on average equity was 1.46% or, on an annualized basis,
5.97%, for the quarter ended March 31, 1999. The table below shows the
components of return on average equity.

                                    Page 15
<PAGE>
 
COMPONENTS OF RETURN ON AVERAGE EQUITY/(1)/

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
For the Quarter Ended          Net Interest Income/         G&A Expense/(2)//           Net Income/
                                      Equity                     Equity                   Equity
---------------------------------------------------------------------------------------------------
<S>                            <C>                          <C>                         <C>
Jun 30, 1998                           2.52%                      0.65%                   1.87%
---------------------------------------------------------------------------------------------------
Sep 30, 1998                           1.92%                      0.64%                   1.28%
---------------------------------------------------------------------------------------------------
Dec 31, 1998                           1.62%                      0.23%                   1.40%
---------------------------------------------------------------------------------------------------
Mar 31, 1999                           1.94%                      0.47%                   1.46%
---------------------------------------------------------------------------------------------------
</TABLE>

(1) Average equity excludes unrealized gain (loss) on available-for-sale ARM
securities.
(2) Excludes performance fees.

The following table shows the Company's average daily balances of cash
equivalents and mortgage assets, the yields earned on each type of earning
assets, the yield on average daily earning assets and interest income.

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------
                                      Average                                    Yield on
                                       Daily                      Yield on        Average      Yield on
                        Average      Amortized      Average        Average         Daily        Average     Dividend
                         Daily        Cost of        Daily          Daily        Amortized       Daily         and
                         Cash        Mortgage       Earning         Cash          Cost of       Earning     Interest
in thousands          Equivalents     Assets        Assets       Equivalents     Mortgage       Assets       Income
                                                                                  Assets
-------------------------------------------------------------------------------------------------------------------
<S>                   <C>            <C>           <C>           <C>             <C>           <C>          <C>
For the quarter ended         
  June 30, 1998          $6,878      $175,340      $182,218          5.59          6.17          6.14        $2,799
-------------------------------------------------------------------------------------------------------------------
For the quarter ended              
  September 30, 1998     $5,476      $196,014      $201,490          5.56          5.92          5.91        $2,978
-------------------------------------------------------------------------------------------------------------------
For the quarter ended             
  December 31, 1998      $6,736      $187,444      $194,181          5.00          5.62          5.60        $2,717
-------------------------------------------------------------------------------------------------------------------
For the quarter ended          
  March 31, 1999         $8,384      $170,633      $179,017          4.87          5.40          5.37        $2,404
-------------------------------------------------------------------------------------------------------------------
</TABLE>
                                        
The table below shows the Company's average daily borrowed funds and average
daily cost of funds as compared to average one- and average three-month LIBOR.

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------------
                                                                                  Average          Average        Average
                                                                                 One-month         Cost of        Cost of
                                                                                   LIBOR            Funds          Funds
                 Average                  Average     Average     Average         Relative        Relative        Relative
                  Daily                    Daily       One-       Three-         to Average      to Average      to Average
                 Borrowed    Interest     Cost of      Month       Month        Three-month       One-month     Three-month
in thousands      Funds      Expense       Funds       LIBOR       LIBOR           LIBOR            LIBOR          LIBOR
---------------------------------------------------------------------------------------------------------------------------
<S>              <C>         <C>          <C>         <C>         <C>           <C>              <C>            <C>
For the quarter
ended        
June 30, 1998    $162,829     $2,318       5.70%       5.66%       5.69%          (0.03)%           0.04%          0.01%
---------------------------------------------------------------------------------------------------------------------------
For the quarter
ended        
Sept 30, 1998     182,954      2,611       5.71%       5.62%       5.62%            0.00%           0.09%          0.09%
---------------------------------------------------------------------------------------------------------------------------
For the quarter
ended       
Dec 31, 1998      174,611      2,407       5.51%       5.36%       5.27%            0.09%           0.15%          0.24%
---------------------------------------------------------------------------------------------------------------------------
For the quarter
ended       
Mar 31, 1999      157,555      2,036       5.24%       4.95%       5.00%          (0.05)%           0.29%          0.24%
---------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                    Page 16
<PAGE>
 
For the quarter ended March 31, 1999, the yield on the Company's total assets,
including the impact of the amortized of premiums and discounts, was 5.37%.  The
Company's weighted average cost of funds at March 31, 1999, was 5.24%.

The Company pays the Manager an annual base management fee, generally based on
average net invested assets, as defined in the Management Agreement, payable
monthly in arrears as follows: 1.0% of the first $300 million of Average Net
Invested Assets, plus 0.8% of the portion above $300 million.

In order for the Manager to earn a performance fee, the rate of return on the
stockholders' investment, as defined in the Management Agreement, must exceed
the average ten-year U.S. Treasury rate during the quarter plus 1%. During the
first quarter of 1999, the Manager earned no performance fee. During the first
quarter of 1999, the Company's return on common equity was 1.46% or, on an
annualized basis, 5.97%. The ten-year U.S. Treasury rate for the corresponding
period was 4.96%.


The following table shows operating expenses as a percent of total assets:

ANNUALIZED OPERATING EXPENSE RATIOS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------
                          Management Fee & Other                        
For The                         Expenses/               Performance Fee/         Total G&A Expenses/
Quarter Ended                  Total Assets               Total Assets               Total Assets
------------------------------------------------------------------------------------------------------
<S>                       <C>                           <C>                      <C>
Jun 30, 1998                      0.23%                      0.00%                      0.23%
------------------------------------------------------------------------------------------------------
Sep 30,1998                       0.24%                      0.00%                      0.24%
------------------------------------------------------------------------------------------------------
Dec 31,1998                       0.09%                      0.00%                      0.09%
------------------------------------------------------------------------------------------------------
Mar 31, 1999                      0.21%                      0.00%                      0.21%
------------------------------------------------------------------------------------------------------
</TABLE>

                                    Page 17
<PAGE>
 
The Company did not enter into any interest rate agreements to date. As part of
its asset/liability management process, the Company may enter into interest rate
agreements such as interest rate caps, floors and swaps.  These agreements would
be entered into to reduce interest rate risk and would be designed to provide
income and capital appreciation to the Company in the event of certain changes
in interest rates.  The Company reviews the need for interest rate agreements on
a regular basis consistent with its Capital Investment Policy.

The Company has not experienced credit losses on its portfolio of ARM securities
to date, but losses may be experienced in the future.  At March 31, 1999, the
Company had limited its exposure to credit losses on its portfolio of  ARM
securities by purchasing only Agency Certificates, which, although not rated,
carry an implied "AAA" rating.

COMMON DIVIDEND

As a REIT, the Company is required to declare dividends amounting to 85% of each
year's taxable income by the end of each calendar year and to have declared
dividends amounting to 95% of its taxable income for each year by the time it
files its applicable tax return and, therefore, generally passes through
substantially all of its earnings to shareholders without paying federal income
tax at the corporate level. Since the Company, as a REIT, pays its dividends
based on taxable earnings, the dividends may at times be more or less than
reported earnings.

On March 17, 1999 the Company declared a dividend of $0.12 per share payable on
April 12, 1999 to holders of record as of April 1, 1999.

LIQUIDITY AND CAPITAL RESOURCES

The Company's primary source of funds for the quarter ended March 31, 1999
consisted of reverse repurchase agreements, which totaled $141 million at March
31, 1999.  The Company's other significant source of funds for the quarter ended
March 31, 1999 consisted of payments of principal and interest from its ARM
securities portfolio in the amount of $18.0 million.  In the future, the Company
expects its primary sources of funds will consist of borrowed funds under
reverse repurchase agreement transactions with one- to twelve-month maturities
and of 

                                    Page 18
<PAGE>
 
monthly payments of principal and interest on its ARM securities portfolio. The
Company's liquid assets generally consist of unpledged ARM assets, cash and cash
equivalents.

The borrowings incurred during the quarter ended March 31, 1999 had a weighted
average interest cost during the quarter of 5.24%.  As of March 31, 1999, all of
the Company's reverse repurchase agreements were fixed-rate term reverse
repurchase agreements with original maturities that range from three months to
one year.  The Company has borrowing arrangements with ten different financial
institutions and on March 31, 1999, had borrowed funds under reverse repurchase
agreements with eight of these firms. Because the Company borrows money based on
the fair value of its ARM securities and because increases in short-term
interest rates can negatively impact the valuation of ARM securities, the
Company's borrowing ability could be limited and lenders may initiate margin
calls in the event short-term interest rates increase or the value of the
Company's ARM securities declines for other reasons.  During the quarter ended
March 31, 1999, the Company had adequate cash flow, liquid assets and unpledged
collateral with which to meet its margin requirements during the period.
Further, the Company believes it will continue to have sufficient liquidity to
meet its future cash requirements from its primary sources of funds for the
foreseeable future without needing to sell assets.

STOCKHOLDERS' EQUITY

The Company uses "available-for-sale" treatment for its Mortgage-Backed
Securities; these assets are carried on the balance sheet at estimated market
value rather than historical amortized cost.  Based upon such "available-for-
sale" treatment, the Company's equity base at March 31, 1999 was $18.0 million,
or $7.86 per share.   If the Company had used historical amortized cost
accounting, the Company's equity base at March 31, 1999 would have been $18.9
million, or $8.23 per share.

With the Company's "available-for-sale" accounting treatment, unrealized
fluctuations in fair values of assets do not impact GAAP or taxable income but
rather are reflected on the balance sheet by changing the carrying value of the
asset and reflecting the change in stockholders' equity under "Other
comprehensive income, unrealized gain (loss) on available for sale securities."
By accounting for its assets in this manner, the Company hopes to provide useful
information to stockholders and creditors and to preserve flexibility to sell
assets in the future without having to change accounting methods.

                                    Page 19
<PAGE>
 
As a result of this mark-to-market accounting treatment, the book value and book
value per share of the Company are likely to fluctuate far more than if the
Company used historical amortized cost accounting.  As a result, comparisons
with companies that use historical cost accounting for some or all of their
balance sheet may be misleading.

Unrealized changes in the estimated fair value of Mortgage-Backed Securities
have one direct effect on the Company's potential earnings and dividends:
positive mark-to-market changes will increase the Company's equity base and
allow the Company to increase its borrowing capacity while negative changes will
tend to limit borrowing capacity under the Company's Capital Investment Policy.
A very large negative change in the net market value of the Company's Mortgage-
Backed Securities might impair the Company's liquidity position, requiring the
Company to sell assets with the likely result of realized losses upon sale.
"Other comprehensive income, unrealized gain (loss) on available for sale
securities" was $.84 million, or 0.50% of the amortized cost of mortgage backed
securities at  March 31, 1999.

EFFECTS OF INTEREST RATE CHANGES

The Company has invested in adjustable-rate mortgage securities.  Adjustable-
rate mortgage assets are typically subject to periodic and lifetime interest
rate caps that limit the amount an adjustable-rate mortgage securities' interest
rate can change during any given period.  Adjustable-rate mortgage securities
are also typically subject to a minimum interest rate payable.  The Company
borrowings will not be subject to similar restrictions.  Hence, in a period of
increasing interest rates, interest rates on its borrowings could increase
without limitation by caps, while the interest rates on its mortgage assets
could be so limited.  This problem would be magnified to the extent the Company
acquires mortgage assets that are not fully indexed.  Further, some adjustable-
rate mortgage assets may be subject to periodic payment caps that result in some
portion of the interest being deferred and added to the principal outstanding.
This could result in receipt by the Company of less cash income on its
adjustable-rate mortgage assets than is required to pay interest on the related
borrowings.  These factors could lower the Company's net interest income or
cause a net loss during periods of rising interest rates, which would negatively
impact the Company's liquidity and its ability to make distributions to
stockholders.

                                    Page 20
<PAGE>
 
The Company intends to fund the purchase of a substantial portion of its
adjustable-rate mortgage securities with borrowings that may have interest rates
based on indices and repricing terms similar to, but of somewhat shorter
maturities than, the interest rate indices and repricing terms of the mortgage
assets.  Thus, the Company anticipates that in most cases the interest rate
indices and repricing terms of its mortgage assets and its funding sources will
not be identical, thereby creating an interest rate mismatch between assets and
liabilities.  During periods of changing interest rates, such interest rate
mismatches could negatively impact the Company's net income, dividend yield and
the market price of the Common Stock.

Prepayments are the full or partial repayment of principal prior to the original
term to maturity of a mortgage loan and typically occur due to refinancing of
mortgage loans.  Prepayment rates on mortgage securities vary from time to time
and may cause changes in the amount of the Company's net interest income.
Prepayments of adjustable-rate mortgage loans usually can be expected to
increase when mortgage interest rates fall below the then-current interest rates
on such loans and decrease when mortgage interest rates exceed the then-current
interest rate on such loans, although such effects are not predictable.
Prepayment experience also may be affected by the conditions in the housing and
financial markets, general economic conditions and the relative interest rates
on fixed-rate and adjustable-rate mortgage loans underlying mortgage securities.
The purchase prices of mortgage securities are generally based upon assumptions
regarding the expected amounts and rates of prepayments.  Where slow prepayment
assumptions are made, the Company may pay a premium for mortgage securities.  To
the extent such assumptions materially and adversely differ from the actual
amounts of prepayments, the Company would experience losses.  The total
prepayment of any mortgage asset that had been purchased at a premium by the
Company would result in the immediate write-off of any remaining capitalized
premium amount and consequent reduction of the Company's net interest income by
such amount.  Finally in the event that the Company is unable to acquire new
mortgage assets to replace the prepaid mortgage assets, its financial condition,
cash flows and results of operations could be materially adversely affected.

OTHER MATTERS

As of March 31, 1999, the Company calculates its Qualified REIT Assets, as
defined in the Internal Revenue Code of 1986, as amended (the "Code"), to be
greater than  90.0% of its total assets, as compared to the Code requirement
that at 

                                    Page 21
<PAGE>
 
least 75% of its total assets must be Qualified REIT Assets. The Company also
calculates that greater than 98% of its 1999 revenue for the quarter ended March
31, 1999 qualifies for both the 75% source of income test and the 95% source of
income test under the REIT rules. The Company also met all REIT requirements
regarding the ownership of its common stock and the distributions of its net
income. Therefore, as of March 31, 1999, the Company believes that it will
continue to qualify as a REIT under the provisions of the Code.

The Company at all times intends to conduct its business so as not to become
regulated as an investment company under the Investment Company Act of 1940, as
amended (the "Investment Company Act). If the Company were to become regulated
as an investment company, then the Company's use of leverage would be
substantially reduced. The Investment Company Act exempts entities that are
"primarily engaged in the business of purchasing or otherwise acquiring
mortgages and other liens on and interests in real estate" ("Qualifying
Interests"). Under current interpretation of the staff of the SEC, in order to
qualify for this exemption, the Company must maintain at least 55% of its assets
directly in Qualifying Interests. In addition, unless certain mortgage
securities represent all of the certificates issued with respect to an
underlying pool of mortgages, such mortgage securities may be treated as
securities separate from the underlying mortgage loans and, thus, may not be
considered Qualifying Interests for purposes of the 55% requirement. The Company
calculates that it is in compliance with this requirement.

YEAR 2000

The Company is subject to risks associated with the "Year 2000" problem, a term
which refers to uncertainties about the ability of various data processing
hardware and software to interpret dates correctly as we approach the Year 2000.

To address these risks the Company has implemented a plan whereby it will
evaluate its internal systems and, to a much larger extent, evaluate the
readiness of the systems used by the Company's External Counterparties.  The
Company will develop contingency plans for implementation in the event of
failure of any systems on which its business relies.

Internal Systems - Currently, the Company uses a general ledger software
application to prepare its books and records, as well as spreadsheet software to
construct subsidiary ledgers.  Throughout the fourth quarter of 1998 and into
the 

                                    Page 22
<PAGE>
 
first and second quarters of 1999 the Company intends to create parallel files
within these applications to test these packages' ability to interpret the year
2000 in various data fields on which calculations are made. In the event that
either application is found not to be Year 2000 compliant, the Company will
obtain replacement software from the suppliers.

To date, the Company has not incurred any additional expense in connection with
the evaluation of internal systems.  Since the Company is externally managed,
the testing and potential software replacement referred to above should not
result in additional cost to the Company.

External Counterparties - The Company has implemented a plan of communicating
with its External Counterparties regarding the state of readiness of their Year
2000 plans. During the fourth quarter of 1998, the Company compiled a list of
these counterparties and solicited information from each one regarding their
Year 2000 plans. Many of these counterparties are prominent broker-dealers and
investment banks or government mortgage agencies who are known by the Company to
be involved in Year 2000 review processes currently being performed by
securities industry regulators (such as the New York Stock Exchange or the
Securities and Exchange Commission) and self-regulatory organizations. The
Company intends to monitor the progress of each of these counterparties over the
course of the next three quarters and report to shareholders regarding progress
made by these counterparties.

Contingency Plans - During the second and third quarters of 1999, after
gathering data through the processes described above, the Company will develop
plans to address any potential failure in internal or external systems.

In its normal course of business the Company relies heavily on the accurate
functioning of many computer applications.  The Company's ability to perform its
normal business functions depends heavily on the Company's ability to perform
mathematical calculations quickly and accurately and its ability to send and
receive funds quickly and accurately.  While the Company believes that
completion of its Year 2000 Plan will reduce some of the uncertainty that
currently surrounds the Year 2000 problem, the Company acknowledges that Year
2000-related breakdowns in either the internal or external systems on which the
Company depends could cause significant disruptions in the Company's operations.

                                    Page 23
<PAGE>
 
PART II. OTHER INFORMATION

Item 1. Legal Proceedings
At March 31, 1999, there were no pending legal proceedings to which the Company
was a party or of which any of its property was subject.

Item 2. Changes in Securities
Not applicable

Item 3. Defaults Upon Senior Securities
Not applicable

Item 4. Submission of Matters to a Vote of Security Holders
Not applicable

Item 5. Other Information
None

Item 6. Exhibits and Reports on Form 8-K:

(a) Exhibits
Exhibit 27 - Financial Data Schedule

(b) Reports on Form 8-K
None

                                    Page 24
<PAGE>
 
SIGNATURES


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

ANWORTH MORTGAGE ASSET CORPORATION


Dated: May 13, 1999


By: /s/ Lloyd McAdams
_________________________
Lloyd McAdams
President
(authorized officer of registrant)



Dated: May 13, 1999


By: /s/ Pamela J. Watson
_________________________
Pamela J. Watson,
Chief Financial Officer and Treasurer
(principal accounting officer)

FINANCIAL DATA SCHEDULE

This schedule contains summary financial information extracted from the March
31, 1999 Form 10-Q and is qualified in its entirety by reference to such
financial statements.

                                    Page 25