THORNBURG MORTGAGE ASSET CORP
S-3D, 1997-09-24
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>   1
  As filed with the Securities and Exchange Commission on September 24, 1997
===============================================================================
                                                     Registration No. 33-

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                            ------------------------

                                    FORM S-3D
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                            ------------------------

                      THORNBURG MORTGAGE ASSET CORPORATION
             (Exact name of registrant as specified in its charter)
                              119 EAST MARCY STREET
                           SANTA FE, NEW MEXICO 87501
                                 (505) 989-1900
               (Name, address and telephone number of Registrant)

           MARYLAND                                           85-0404134
(State or other jurisdiction of                           (I.R.S. Employer
incorporation or organization)                           Identification No.)

                            ------------------------

                       H. GARRETT THORNBURG, JR. CHAIRMAN
                      THORNBURG MORTGAGE ASSET CORPORATION
                              119 EAST MARCY STREET
                           SANTA FE, NEW MEXICO 87501
                                 (505) 989-1900
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                           --------------------------

                                   Copies to:
                            MICHAEL B. JEFFERS, ESQ.
                       JEFFERS, WILSON, SHAFF & FALK, LLP
                       18881 VON KARMAN AVENUE, SUITE 1400
                            IRVINE, CALIFORNIA 92612

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
                              as soon as effective

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ]

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
Registration statement number of the earlier effective registration statement
for the same offering. [ ]

If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

                        CALCULATION OF REGISTRATION FEES
<TABLE>
<CAPTION>
==========================================================================================================================
                                                             Proposed Maximum      Proposed Maximum       
             Title of Shares                 Amount to be     Aggregate Price     Aggregate Offering         Amount of           
            to be Registered                  Registered       Per Share(1)              Price           Registration Fee        
- --------------------------------------------------------------------------------------------------------------------------
<S>                                          <C>               <C>                <C>                    <C>                     
Common Stock, $.01 par value per share        1,000,000           23.4375             $23,437,500              $7,102            
==========================================================================================================================
</TABLE>
(1)  Calculated pursuant to Rule 457(c) of the rules and regulations under the 
     Securities Act of 1933, as amended.
(2)  Pursuant to Rule 429 under the Securities Act of 1933, the Prospectus 
     included herein also relates to 840,684 shares of Common Stock  previously
     registered for sale under Registration Statement No. 333-23323, which was 
     declared effective on March 14, 1997 and for which a filing fee of $ 7,110
     was previously paid. In the event any securities previously registered for
     sale are offered and sold prior to the effective date of this Registration 
     Statement, they will not be included in any Prospectus hereunder. The 
     amount of securities being registered for sale, together with the remaining
     securities registered under Registration Statement 333-23323 represents the
     maximum number of securities which are expected to be offered and sold.
===============================================================================


<PAGE>   2

PROSPECTUS
- ----------

                      THORNBURG MORTGAGE ASSET CORPORATION
                            DIVIDEND REINVESTMENT AND
                               STOCK PURCHASE PLAN

         The Dividend Reinvestment and Stock Purchase Plan (the "Plan") of
Thornburg Mortgage Asset Corporation (the "Company") provides both existing
shareholders of the Company's common stock ("Common Stock") and preferred stock
("Preferred Stock") (the "Shareholders") of the Company and interested new
investors with a convenient and cost effective method to purchase shares of the
Common Stock. A participant in the Plan may purchase additional shares of Common
Stock by reinvesting some or all cash dividends paid on the Company's
outstanding Common Stock and Preferred Stock (collectively, the "Company
Stock"). Shareholders that elect to participate in the Plan may also make
monthly optional cash purchases ("Optional Cash Purchases") which are subject to
a minimum monthly purchase limit of $100 and a maximum monthly purchase limit of
$5,000. Interested investors not currently shareholders may make initial cash
purchases ("Initial Cash Purchases") which are subject to a minimum monthly
purchase limit of $500 and a maximum monthly purchase limit of $5,000. The price
to be paid for each share of Common Stock purchased directly from the Company
under the Plan will be a price equal to the market price (as defined herein) of
the Common Stock less a discount ranging from 0% to 5% (the "Discount Rate").
The price of the shares of Common Stock purchased on the open market will be the
average price of all shares of Common Stock purchased for all Participants in
the Plan without any discount.

         The Prospectus relates to the offer and sale of 1,840,684 authorized
but unissued shares of Common Stock under the Plan. Participants should retain
this prospectus for future reference. The Company's Common Stock and Preferred
Stock are listed on the New York Stock Exchange under the symbols "TMA" and
"TMAPrA," respectively.

         Plan Highlights:

                  -   Any registered shareholder may elect to participate in the
                      Plan.
                  -   Interested investors, not currently shareholders of
                      the Company, may make their initial investment in the
                      Company through the Plan.
                  -   0% to 5% discount on shares of Common Stock purchased 
                      directly from the Company.
                  -   No brokerage fees on purchases made in the open market 
                      unless in excess of 5%.
                  -   Certificate safekeeping in book entry form at Continental 
                      Stock Transfer & Trust Company, at no charge to 
                      Participant.
                  -   Full or partial dividend reinvestment options.
                  -   Optional Cash Purchases.

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
       AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS
         THE SECURITIES AND EXCHANGE COMMISSION PASSED UPON THE ACCURACY
            OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                         CONTRARY IS A CRIMINAL OFFENSE

       THE ATTORNEY GENERAL OF THE STATE OF NEW YORK HAS NOT PASSED ON OR
            ENDORSED THE MERITS OF THIS OFFERING. ANY REPRESENTATION
                          TO THE CONTRARY IS UNLAWFUL.

         No person has been authorized to give any information or to make any
representations not contained in this Prospectus regarding the Company or the
offering made hereby and, if given or made, such information or representations
must not be relied upon as having been authorized by the Company. This
Prospectus does not constitute an offer to sell or a solicitation of an offer to
buy any securities other than the securities to which it relates, nor does it
constitute an offer to or solicitation of any person in any jurisdiction in
which such offer or solicitation would be unlawful. Neither delivery of this
Prospectus nor any sale made hereunder shall create an implication that
information contained herein is correct as of any time subsequent to the date
hereof.

               The date of this Prospectus is September 24, 1997.


                                        1

<PAGE>   3

                              AVAILABLE INFORMATION

         The Company is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information filed by the Company can be inspected and
copied (at prescribed rates) at the public reference facilities maintained by
the Commission at 450 Fifth Street N.W., Washington, D.C. 20549, and at its
Regional Offices located at Northwestern Atrium Center, 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661 and 7 World Trade Center, Suite 1300, New
York, New York, 10048. The Company files information electronically with the
Commission, and the Commission maintains a Web Site that contains reports, proxy
and information statements and other information regarding registrants
(including the Company) that file electronically with the Commission. The
address of the Commission's Web Site is (http://www.sec.gov)

         This prospectus constitutes a part of a Registration Statement on Form
S-3 together with all exhibits referred to as the Registration Statement (the
"Registration Statement") filed by the Company with the Commission under the
Securities Act of 1933, as amended (the "Securities Act"). This prospectus omits
certain information contained in the Registration Statement, and reference is
hereby made to the Registration Statement for further information with respect
to the Company and the shares offered hereby. Any statement contained or
incorporated by reference herein concerning the provisions of any document is
not necessarily complete, and in each instance, reference is made to the copy of
such document filed as an exhibit to the Registration Statement or otherwise
filed with the Commission. Each such statement is qualified in its entirety by
such statement.

                     INCORPORATION OF DOCUMENTS BY REFERENCE

         The following documents, filed with the Commission pursuant to the 1934
Act, are incorporated by reference in this Prospectus:

         1. The Company's Annual Report on Form 10-K for the year ended December
            31, 1996;

         2. The Company's Quarterly Reports on Form 10-Q for the quarters ended
            March 31, 1997 and June 30, 1997;

         3. The Company's current reports on Form 8-K dated January 22, 1997,
            May 16, 1997, July 7, 1997, July 14, 1997 and July 17, 1997.

         4. The description of the Company's Common Stock contained in the
            Company's Registration Statement on Form 8-A under the 1934 Act, 
            including any amendment or report filed to update the description, 
            and the description of the Company's Preferred Stock contained in 
            the Company's Registration Statement on Form 8-A under the 1934 Act,
            including any amendment or report filed to update the description.

         All documents filed by the Company pursuant to Sections 13(a), 13(c),
14 and 15(d) of the Exchange Act of 1934, prior to filing a post-effective
amendment which indicates that all securities offered hereby have been sold or
which deregisters all securities offered hereby then remaining unsold, shall be
deemed to be incorporated by reference herein and shall be deemed to be a part
hereof from the date of the filing of such documents. Any statement contained in
a document incorporated or deemed to be incorporated by reference herein shall
be deemed to be modified, superseded or replaced by a statement or information
contained in any other subsequently filed document incorporated herein by
reference. Any such statement so modified, superseded or replaced shall not be
deemed, except as so modified, superseded or replaced, to constitute a part of
this Prospectus.

         Anyone receiving a copy of this Prospectus may obtain, without charge,
a copy of any of the documents incorporated by reference herein, except for any
exhibits to such documents. Written requests should be mailed to Thornburg
Mortgage Asset Corporation, 119 E. Marcy Street, Santa Fe, New Mexico 87501, or
call (505) 9891900.


                                        2

<PAGE>   4

                                   THE COMPANY

         Thornburg Mortgage Asset Corporation (the "Company") is a special
purpose financial institution that primarily invests in adjustable-rate mortgage
("ARM") securities, thereby indirectly providing capital to the single-family
residential housing market. ARM securities represent interests in pools of
adjustable-rate mortgage loans, which often include guarantees or other credit
enhancements against losses from loan defaults. While the Company is not a bank
or savings and loan, its business purpose, strategy, method of operation and
risk profile are best understood in comparison to such institutions. The Company
leverages its equity capital using borrowed funds, invests in ARM securities and
seeks to generate income based on the difference between the yield on its ARM
securities portfolio and the cost of its borrowings. The corporate structure of
the Company differs from most lending institutions in that 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
shareholders without paying federal income tax at the corporate level.

DIVIDEND AND DISTRIBUTION POLICY

         The Company intends to pay dividends and to make such distributions to
its shareholders in amounts such that all or substantially all of its taxable
income in each year (subject to certain adjustments) is distributed so as to
qualify for the tax benefits accorded to a REIT under the Code. Taxable income,
if any, not distributed through regular dividends will be distributed annually
in a special dividend. Such dividend must be declared prior to the timely filing
of the Company's tax return for such year and paid not later than the next
regular dividend payment date after such declaration. All distributions will be
made by the Company at the discretion of the Board of Directors and will depend
on the earnings of the Company, financial condition of the Company, maintenance
of REIT status and such other factors as the Board of Directors may deem
relevant from time to time.

USE OF PROCEEDS

         The net proceeds to the Company from the sale of shares of Common Stock
offered hereby will be used for general corporate purposes.

                               SUMMARY OF THE PLAN

         The Plan provides Shareholders and other investors with a convenient
and economical way to purchase shares of Common Stock through the reinvestment
of all or a portion of their cash dividends paid on Company Stock in additional
shares of Common Stock. There is no minimum or maximum limitation on the amount
of dividends a Participant may reinvest under the Plan. In addition to the
reinvestment of dividends, Shareholders who are Participants in the Plan may
invest additional funds through Optional Cash Purchases of not less than $100
and not more than $5,000 per month (except in cases covered by a Request for
Waiver, as discussed below). Persons not currently Shareholders of the Company
may become Participants by making an Initial Cash Purchase of not less than $500
and not more than $5,000 to purchase shares under the Plan (except in cases
covered by a Request for Waiver). For purposes of these limitations, all Plan
accounts under the common control or management of a Participant may be
aggregated at the Company's sole discretion. Optional Cash Purchases and Initial
Cash Purchases (collectively "Cash Purchases") in excess of $5,000 may be made
only upon acceptance by the Company of a completed Request for Waiver form from
a Participant.

         To fulfill Plan requirements, shares of Common Stock may be purchased
directly from the Company or, at the Company's election, in the open market or
in privately negotiated transactions. Shares purchased directly from the Company
under the Plan (whether in connection with Cash Purchases of less than $5,000
per month or reinvestment of dividends) may be issued at a discount of 0% to 5%
(the "Discount Rate") to the Market Price for Dividend Reinvestments and the
Market Price for Cash Purchases (both as defined herein). As of the date of this
Prospectus, the discount is 3%, but is subject to change from time to time or
discontinuance at the Company's discretion for future investment periods,
without prior notice to the Participants, after a review of current market
conditions, the level of participation in the Plan, the Company's current and
projected capital needs, and the Company's need to maintain its status as a REIT
for tax purposes. The Company may establish a different discount ranging from 0%
to 5% (the "Waiver Discount") regarding shares purchased from the Company for
Cash Purchases exceeding $5,000 per month and approved by the Company pursuant
to a Request for Waiver. The Company may also, without prior notice to
Participants, change its determination that shares of Common Stock will be
purchased by the Plan's Agent directly from the Company or on the open market.
No discount will be offered on shares purchased under the Plan in the open
market or in privately negotiated transactions.

         Each month, at least three business days prior to the first day of the
relevant Pricing Period (as defined herein), the Company may establish a Waiver
Discount and Threshold Price applicable to Cash Purchases exceeding $5,000. The
Waiver Discount, which may vary each month from 0% to 5%, will be established in
the Company's sole discretion after a review of current market conditions, the
level of participation in the Plan and the Company's current and projected
capital needs. With respect to Cash Purchases that exceed


                                        3

<PAGE>   5

$5,000 only, for each Trading Day (as defined herein) of the related twelve-day
Pricing Period on which the Threshold Price is not satisfied, one-twelfth of a
Participant's Cash Purchase will be returned without interest. Cash Purchases
that do not exceed $5,000, and the reinvestment of dividends in additional
shares of Common Stock, will not be subject to such Threshold Price, if any. If
shares are purchased under the Plan other than directly from the Company, no
discount will be offered and no Threshold Price will be applicable.

         In deciding whether to approve a Request for Waiver, the Company will
consider relevant factors including, but not limited to, whether the Plan is
then acquiring newly issued or treasury shares directly from the Company or
acquiring shares from third parties in the open market or in privately
negotiated transactions, the Company's needs for additional funds, the
attractiveness of obtaining such additional funds through the sale of Common
Stock as compared to other sources of funds, the purchase price likely to apply
to any sale of Common Stock under the Plan, the Participant submitting the
request, the extent and nature of such Participant's prior participation in the
Plan, the number of shares of Common Stock held by such Participant and the
aggregate amount of cash investments for which Requests for Waiver have been
submitted by all Participants. If such requests are submitted for any Cash
Purchase Investment Date (as defined herein) for an aggregate amount in excess
of the amount the Company is then willing to accept, the Company may honor such
requests in order of receipt, pro rata or by any other method that the Company
in its sole discretion determines to be appropriate. A broker, bank or other
nominee may reinvest dividends and make Cash Purchases on behalf of Beneficial
Owners. Cash Purchases submitted by brokerage firms or other nominees on behalf
of Participants will be aggregated for purposes of determining whether the
$5,000 limit would be exceeded.

         From time to time, financial intermediaries, including brokers and
dealers, and other persons may engage in positioning transactions in order to
benefit from the discount from market price of the Common Stock acquired under
the Plan. Such transactions may cause fluctuations in the trading volume of the
Common Stock. Financial intermediaries and such other persons who engage in
positioning transactions may be deemed to be underwriters. The Company has no
arrangements or understandings, formal or informal, with any person relating to
the sale of shares to be received pursuant to the Plan.

         Subject to the availability of shares of Common Stock registered for
issuance under the Plan, there is no total maximum number of shares that can be
issued pursuant to the reinvestment of dividends and no pre-established maximum
limit applicable to cash investments that may be made pursuant to Requests for
Waiver. As of the date hereof, 1,840,684 shares of Common Stock have been
registered and are available for sale under the Plan.

         Shares purchased directly from the Company through dividend
reinvestment and Cash Purchases under the Plan will be issued without a sales
commission. If the shares of Common Stock to be purchased under the Plan are
purchased in the open market instead of directly from the Company, the Company
will pay any brokerage fees or commissions on such purchases, up to 5% of the
purchase price of the shares of the Common Stock. Any commissions in excess of
5% will be paid by the Participants on a pro rata basis. The Discount Rate will
not apply to open market purchases or to privately negotiated purchases of
Common Stock.

         Participants in the Plan who reinvest dividends will be treated for
federal income tax purposes as having received a dividend, without receiving
cash to pay any tax payment obligation that could arise as a result of such
dividend. Participants will have limited control regarding the specific timing
of optional cash purchases and sales under the Plan. Furthermore, Participants
will generally be unable to depend on the availability of a market discount
regarding shares acquired under the Plan. See "The Plan--Advantages and
Disadvantages."


                                        4

<PAGE>   6
                                    THE PLAN

         The original Dividend Reinvestment Plan was adopted by the Board of
Directors on August 30, 1994. The Plan was amended by the Board of Directors as
of January 8, 1997 to permit the reinvestment of dividends paid on the Company's
outstanding Preferred Stock as well as on the Common Stock. The Plan was amended
again on September 17, 1997 to allow for investment through the Plan by
interested investors who were not current shareholders of the Company. THE
AMENDED AND RESTATED PLAN WILL BE EFFECTIVE FOR THE FIRST MONTHLY CASH PURCHASE
OPTIONS ON THE NOVEMBER 25, 1997 CASH PURCHASE INVESTMENT DATE. PARTICIPANTS
UNDER THE EXISTING PLAN MAY PARTICIPATE IN THE FINAL QUARTERLY CASH PURCHASES
OPTION OF UP TO $15,000 ON THE OCTOBER 10, 1997 DIVIDEND REINVESTMENT DATE.

ADVANTAGES AND DISADVANTAGES

         Advantages

         o        The Plan provides Participants with the opportunity to
                  purchase additional shares of Common Stock, if desired, by
                  automatically reinvesting all or a portion of their cash
                  dividends on Company Stock in the Plan.

         o        In addition to the reinvestment of dividends, the Plan
                  provides Shareholders with the opportunity to make monthly
                  investments of Common Stock through Optional Cash Purchases,
                  subject to a minimum and maximum amount. Optional Cash
                  Purchases may be made by check, money order, wire transfer, or
                  electronic funds transfer from a predesignated bank account.
                  Optional Cash Purchases may be made occasionally or at regular
                  intervals, as the Participant desires. Participants may make
                  Optional Cash Purchases even if dividends on their shares of
                  Common Stock are not being reinvested.

         o        The Plan also provides non-shareholders of the Company the
                  opportunity to become Participants by making an Initial Cash
                  Purchase in the Company's Common Stock, subject to a minimum
                  and maximum amount.

         o        Shares purchased directly from the Company through dividend
                  reinvestment under the Plan will be issued without a sales
                  commission and may be issued at the Discount Rate to the
                  Market Price for Dividend Reinvestments (as defined herein).
                  If the Company should elect that the shares of Common Stock to
                  be purchased under the Plan are to be purchased in the open
                  market instead of directly from the Company, the Company will
                  pay any brokerage fees or commissions on such purchases, up to
                  5% of the purchase price of the shares of the Common Stock.
                  Any commissions in excess of 5% will be paid by the
                  Participants on a pro rata basis. The Discount Rate will not
                  apply to open market purchases or to privately negotiated
                  purchases of Common Stock.

         o        Shares purchased directly from the Company for investment
                  through Cash Purchases under the Plan will be issued without a
                  sales commission and may be issued at the Discount Rate to the
                  Market Price for Cash Purchases (as defined herein). If the
                  Company elects that the shares of Common Stock to be purchased
                  under the Plan are to be purchased in the open market instead
                  of directly from the Company, the Company will pay any
                  brokerage fees or commissions on such purchases, up to 5% of
                  the purchase price of the shares of the Common Stock. Any
                  commissions in excess of 5% will be paid by the Participants
                  on a pro rata basis. The Discount Rate will not apply to open
                  market purchases or to privately negotiated purchases of
                  Common Stock.

         o        Funds invested in the Plan are fully invested through the
                  purchase of fractions of shares, as well as whole shares, and
                  proportionate cash dividends on fractions of shares are used
                  to purchase additional shares.

         o        Participants may direct the Agent to transfer, at any time
                  and at no cost to the Participant, all or a portion of
                  Participant's shares in the Plan to a Plan account for another
                  person.

         o        The Plan offers a "share safekeeping" service whereby, at no
                  cost, Participants may deposit their Company Stock
                  certificates with the Agent and have their ownership of such
                  Company Stock maintained on the Agent's records as part of
                  their Plan account.

         o        Participants will receive statements containing year-to-date
                  information on all Plan transactions in a Participant's
                  account within a reasonable time after a transaction occurs,
                  designed to simplify the Participants' record keeping.


                                        5

<PAGE>   7

         Disadvantages

         o        Participants in the Plan who reinvest dividends will be
                  treated for federal income tax purposes as having received a
                  dividend on the dividend reinvestment date (the "Dividend
                  Reinvestment Date"); such dividend may give rise to a tax
                  payment obligation without providing the Participant with
                  immediate cash to pay such tax when it becomes due.
                  See "Tax Consequences."

         o        Participants will have limited control regarding the specific
                  timing of purchases and sales under the Plan. Because
                  purchases under the Plan will be made no earlier than twelve
                  business days following receipt of an investment instruction,
                  and because sales under the Plan will be effected by the Agent
                  only as soon as practicable after its receipt of such
                  instructions, Participants may be unable to achieve the same
                  level of control over purchase and sale timing that they might
                  have for investments made outside the Plan.

         o        The Company may, in its sole discretion, without prior notice 
                  to Participants, change its determination as to whether shares
                  of Common Stock will be purchased by the Agent directly from
                  the Company or through open market or privately negotiated 
                  purchases. No Discount Rate will be applied on shares 
                  purchased under the Plan in the open market or in privately 
                  negotiated purchases.  The Company may also, without prior 
                  notice to Participants, lower or eliminate the Discount Rate 
                  on shares to be purchased directly from the Company for future
                  investment periods. As a result, Participants will generally 
                  be unable to depend on the availability of a market discount
                  regarding shares acquired under the Plan. Participants may 
                  obtain the applicable Discount Rate by telephoning the Company
                  toll free at (888) 898-8601 three business days prior to the 
                  first day of the Pricing Period.

         o        No interest will be paid by the Company or the Agent on
                  dividends or Cash Purchases held pending reinvestment or
                  investment or to be returned to the Participant. In addition,
                  Cash Purchases exceeding $5,000 per month may be subject to
                  return to the Participant (in whole or proportionate part)
                  without interest in the event that (i) a Threshold Price has
                  been established with respect to shares to be purchased from
                  the Company, and (ii) such Threshold Price is not met for any
                  day on which the New York Stock Exchange ("NYSE") is open for
                  trading ("Trading Day") during the twelve Trading Days prior
                  to the date scheduled for investment of the funds contributed
                  for Cash Purchases for that month (the "Pricing Period").

         o        With respect to Cash Purchases (including Cash Purchases
                  exceeding $5,000 per month), while the Plan allows the Company
                  to establish a Discount Rate from the Market Price for Cash
                  Purchases of the shares, there can be no assurance that such
                  Market Price for Cash Purchases, as so discounted, will not be
                  equal to or greater than the purchase price of the shares on
                  the relevant date of investment of the funds contributed for
                  Cash Purchases (the "Cash Purchase Investment Date").

ADMINISTRATION

         The Plan is administered by Continental Stock Transfer & Trust Company
(the "Agent"), the Transfer Agent and Registrar for the Company. As the Agent
for participating shareholders ("Participants"), the Agent will administer the
Plan in accordance with the terms and conditions of the Plan as set forth
herein.

PARTICIPATION

         Participation in the Plan is open to any person or entity, whether or
not a Shareholder of the Company, who fulfills the requirements for
participation described below under "Participation Options". A Shareholder who
owns shares of Company Stock in their own name is referred to herein as a
"Shareholder of Record." A Shareholder of Record may participate directly in the
Plan. A Shareholder who beneficially owns shares of Company Stock that are
registered in a name other than such Shareholder's name (for example, where
shares are held in the name of a broker, bank or other nominee) is referred to
herein as a "Beneficial Owner." A Beneficial Owner may participate in the Plan
by either (i) becoming a Shareholder of Record by having one or more shares
transferred into their own name, or (ii) coordinating their participation with
their broker, bank or other nominee who is the record holder to participate on
their behalf. A prospective investor who holds no shares of Company Stock may
also participate, at their option, either directly or through a broker, bank or
other nominee by following the enrollment procedures described below.

         The Plan is intended for the benefit of investors in the Company and
not for persons or entities who accumulate accounts under the Plan over which
they have control for the purpose of exceeding the $5,000 per month maximum
without seeking the advance approval of the Company or who engage in
transactions that cause or are designed to cause aberrations in the price or
trading volume


                                        6

<PAGE>   8

of the Common Stock. Notwithstanding anything in the Plan to the contrary, the
Company reserves the right to exclude from participation in the Plan, at any
time, (i) persons or entities who attempt to circumvent the Plan's standard
$5,000 per month maximum by accumulating accounts over which they have control
or (ii) any other persons or entities, as determined in the sole discretion of
the Company. For the purpose of this limitation, the Company reserves the right
to aggregate all Cash Purchases for Participants with more than one account
using the same name, address or social security or taxpayer identification
number. For Participants unable to supply a social security or taxpayer
identification number, participation may be limited by the Company to only one
Plan account. Also for the purpose of such limitations, all Plan accounts that
the Company believes to be under common control or management or to have common
ultimate beneficial ownership may be aggregated. In the event the Company
exercises its right to aggregate investments and the result would be an
investment in excess of $5,000 without an approved Request for Waiver, the
Company will return, without interest, as promptly as practicable, any amount in
excess of the investment limitations.

PARTICIPATION OPTIONS

         The Authorization Form appoints the Agent as agent for the Participant
and directs the Company to pay to the Agent such Participant's cash dividends on
all or a specified number of shares of Company Stock owned by the Participant
("Participating Shares"), as well as on all whole and fractional shares of
Common Stock credited to a Participant's Plan account ("Plan Shares"). The
Authorization Form directs the Agent to purchase on the Dividend Reinvestment
Date additional shares of Common Stock with such dividends. The Authorization
Form also directs the Agent to purchase on the relevant Cash Purchase Investment
Date additional shares of Common Stock with Cash Purchases of not more than
$5,000, if any, made by Participants. See "Cash Purchases---Waiver of Maximum
Cash Purchase Limitation" below for a discussion of the requirements for Cash
Purchases exceeding $5,000. See "Broker and Nominee Form" below for a discussion
of the requirements for Optional Cash Purchases of a Beneficial Owner, and
Initial Cash Purchases of an investor who is not a Shareholder of the Company,
whose broker, bank or other nominee holds or will hold such investor's shares in
the name of a major securities depository. The Authorization Form also directs
the Agent to reinvest automatically all subsequent dividends on Plan Shares.
Dividends will continue to be reinvested until the Participant specifies
otherwise by contacting the Agent, withdraws from the Plan, or the Plan is
terminated.

         The Authorization Form provides for the purchase of additional shares
of Common Stock through the following investment options:

         Full Dividend Reinvestment. The Agent will apply any cash dividends on
all shares of the Company Stock registered in the Plan under the Participant's
name, and all cash dividends on Plan Shares, together with any Optional Cash
Purchases or Initial Cash Purchase, toward the purchase of additional shares of
Common Stock.

         Partial Dividend Reinvestment. The Agent will apply cash dividends on
shares of Company Stock registered in the Plan under the Participant's name and
specified on the Authorization Form, and all cash dividends on Plan Shares,
together with any Optional Cash Purchases or Initial Cash Purchase, toward the
purchase of additional shares of Common Stock.

         Cash Purchases. The Agent will only apply voluntary cash contributions
for Cash Purchases received from the Participant, toward the purchase of
additional shares of Common Stock. The Participant will continue to receive cash
dividends on shares of Company Stock registered in the Plan under the
Participant's name in the usual manner.

         Each Participant may select either one of the dividend reinvestment
options and/or the Cash Purchase option. In each case, dividends will be
reinvested on all Participating Shares and on all Plan Shares held in the Plan
account, including dividends on Common Stock purchased with any Initial Cash
Purchases, until a Participant specifies otherwise by contacting the Agent, or
withdraws from the Plan altogether, or until the Plan is terminated. If a
Participant would prefer to receive cash payments of dividends on Plan Shares
rather than reinvest such dividends, those shares must be withdrawn from the
Plan by written notification to the Agent. See "Termination of Participation"
below. Participants may change their investment options at any time by
requesting a new Authorization Form and returning it to the Agent.

         Participation in the Plan will begin upon receipt of a properly
completed Authorization Form and/or Broker and Nominee Form (and, in cases of
cash investments exceeding $5,000, receipt and approval by the Company of a
properly completed Request for Wavier). The funds for a Cash Purchase may be
submitted with the initial Authorization Form. Thereafter, it will not be
necessary to submit an additional Authorization Form and Cash Purchases may be
made monthly or periodically at the election of the Participant. Once an
Authorization Form has been submitted, it is not necessary to submit one with
subsequent Cash Purchases. See "The Plan--Purchase and Price of Shares" for more
details on Cash Purchases and Dividend Reinvestments.


                                        7

<PAGE>   9
         With respect to the dividend reinvestment portion of the Plan, the
Authorization Form (and the Broker Nominee Form if necessary) must be received
by the Agent at least two (2) calendar days prior to the Record Date established
for a particular dividend in order for a Shareholder to be eligible for
reinvestment of such dividends under the Plan for that related dividend;
otherwise, reinvestment will begin on the Dividend Reinvestment Date following
the next record date. With respect to Cash Purchases, the Agent must receive the
Authorization Form, good funds, and the Broker and Nominee Form if necessary, at
least one business day prior to the commencement of the Pricing Period in order
for a Participant's Cash Purchase to be invested on the related Cash Purchase
Investment Date, otherwise; such authorization will be effective as of the next
Cash Purchase Investment Date and the funds will be returned to the Participant
as provided in "The Plan -- Purchase and Price of Shares."

         SHAREHOLDERS CURRENTLY ENROLLED IN THE PLAN MAY CONTINUE TO PARTICIPATE
IN THE PLAN WITHOUT ANY FURTHER ACTION REQUIRED ON THEIR PART UNLESS THE
PARTICIPANT WISHES TO CHANGE HIS OR HER PARTICIPATION OPTION.

BROKER AND NOMINEE FORM

         The Broker and Nominee Form provides the only means by which a broker,
bank or other nominee holding shares of a Beneficial Owner, or planning to hold
shares of an interested investor who is not currently a Shareholder of the
Company, in the name of a major securities depository may invest Cash Purchases
within the minimum and maximum investment limitation established for the Plan
(see "Cash Purchases" below) on behalf of such Beneficial Owner or interested
investor. A Broker and Nominee Form must be delivered to the Agent each time
such broker, bank or other nominee transmits Cash Purchases. Broker and Nominee
Forms may be obtained at any time by telephoning the Agent at (212) 509-4000.

         The Broker and Nominee Form and appropriate instructions must be
received by the Agent not later than 12:00 Noon New York City time on the
business day immediately preceding the relevant Pricing Period in order to be
invested on the Cash Purchase Investment Date, otherwise the Cash Purchase will
be returned, without interest.

         Shares issued pursuant to a properly completed Broker and Nominee Form
will not be deemed Plan Shares. Therefore, subsequent dividends will be paid in
cash unless otherwise instructed by the Beneficial Owner (See "Participation"
above for a discussion of the requirements for Beneficial Owner participation in
the reinvestment of dividends).

ACCOUNTS AND STATEMENTS

         The Agent will establish an account under the Plan for each Participant
(the "Participant's Account"), and will credit to the Participant's Account cash
received by the Agent for the Participant from cash dividends paid on the shares
of Common Stock, including those full and fractional shares of Common Stock
(computed to three decimal places) acquired under the Plan, and all voluntary
cash contributions for Cash Purchases received by the Agent from the
Participant.

         As soon as practicable after the purchases of shares of Common Stock
have been completed, the Agent will send each Participant a statement of their
account ("Account Statement"). The Account Statement will confirm the
transaction and itemize any previous investment activity for the calendar year.
ACCOUNT STATEMENTS SHOULD BE RETAINED BY THE PARTICIPANT FOR HIS OR HER OWN
RECORDS.

PURCHASE AND PRICE OF SHARES

         DIVIDEND REINVESTMENT. The Agent will apply cash credited to the
Participant's Account to the purchase of full and/or fractional interests in
shares of Common Stock and will credit the number of shares of Common Stock so
purchased to the Participant's Account. The Agent will apply such funds toward
the purchase of shares of Common Stock in the open market or from authorized but
unissued shares of Common Stock for the Participant's Account.

                  (1) Discount Rate on Dividend Reinvestments. The price of the
authorized but unissued shares of Common Stock purchased by the Agent directly
from the Company pursuant to the reinvestment of dividends may be issued at the
Discount Rate to the then current Market Price for Dividend Reinvestments as of
the Dividend Reinvestment Date. The Discount Rate is subject to change for
future dividend reinvestments, or complete discontinuance at the Company's
discretion, without prior notice to the Participants after a review of current
market conditions, the level of participation in the Plan and the Company's
current and projected capital needs. Participants may obtain the applicable
Discount Rate by telephoning the Company toll free at (888) 898-8601 three
business days prior to the Dividend Reinvestment Date. The Discount Rate will
only be in effect for purchases of shares of Common Stock directly


                                        8

<PAGE>   10

from the Company; if the Company elects to purchase the shares in the open
market or in privately negotiated transactions, the Discount Rate will not be
applied to such purchases for the Participant's Account.

                  (2) Price per Share for Reinvested Dividends. The "Market
Price for Dividend Reinvestments" per share of Common Stock acquired directly
from the Company shall be the average of the daily high and low sales prices,
computed to four decimal places, of the shares of Common Stock as reported on
the NYSE on the Dividend Reinvestment Date, or if no trading occurs in the
Common Stock on the Dividend Reinvestment Date, the average of the high and low
sales prices for the first Trading Day immediately preceding the Dividend
Reinvestment Date for which trades are reported. If the Company elects to
purchase the shares on the open market or in privately negotiated transactions,
the price per share of Common Stock acquired through such open market or
privately negotiated transactions will be the weighted average of the actual
prices paid, computed to four decimal places, for all the Common Stock purchased
by the Agent in connection with such open market purchases, without application
of the Discount Rate. The Agent shall pay brokerage commissions in an amount
determined by the prevailing rates at the time of purchase. Such commissions
will be reimbursed by the Company, but in no event shall the Company be
obligated to pay commissions in excess of five percent (5%) of the purchase
price of the shares of Common Stock. Any commissions in excess of five percent
(5%) will be paid by the Participants on a pro rata basis. Such open market
purchases may be made, at the Agent's option, on any securities exchange where
the shares of Common Stock are traded, in the over-the-counter market or in
negotiated transactions with third persons, and may be on such terms as to
price, delivery, and otherwise as the Agent may determine.

                  (3) Dividend Reinvestment Date. The Dividend Reinvestment Date
for the reinvestment of dividends will be on or within fifteen (15) days after
the Dividend Payment Date except where completion at a later date is necessary
or advisable under applicable securities laws. Under normal market conditions,
the funds are expected to be reinvested on the Dividend Payment Date.
For a schedule of expected Dividend Reinvestment Dates through 1999, see
Schedule A.

         CASH PURCHASES. A Shareholder may also make Optional Cash Purchases of
shares of Common Stock, subject to a minimum of $100 and a maximum of $5,000
(except in cases covered by a Request for Waiver as discussed below). New
investors, not currently Shareholders of the Company, may make Initial Cash
Purchases subject to a minimum of $500 and a maximum of $5,000 (except in cases
covered by a Request for Waiver). For purposes of these limitations on Cash
Purchases, all Plan Accounts under the common control or management of a
Participant may be aggregated at the Company's sole discretion.

                  (1) Discount Rate on Cash Purchases. The price of the
authorized but unissued shares of Common Stock purchased by the Agent directly
from the Company for Cash Purchases not in excess of the $5,000 maximum may be
issued at the Discount Rate to the then current Market Price for Cash Purchases
as of the Cash Purchase Investment Date. The Discount Rate is subject to change
for future investment periods, or complete discontinuance at the Company's
discretion, without prior notice to the Participants after a review of current
market conditions, the level of participation in the Plan and the Company's
current and projected capital needs. Participants may obtain the applicable
Discount Rate by telephoning the Company toll free at (888) 898-8601 three
business days prior to the Dividend Reinvestment Date. The Discount Rate will
only be in effect for purchases of shares of Common Stock directly from the
Company; the Discount Rate will not be applied to purchases for the
Participant's Account in the open market or in privately negotiated
transactions.

                  (2) Price per Share for Cash Purchases. The "Market Price for
Cash Purchases" per share shall be the average of the daily high and low sales
prices, computed to four decimal places, of the shares of Common Stock as
reported on the NYSE during the Pricing Period prior to the related Cash
Purchase Investment Date. No commission shall be paid with respect to purchases
of authorized but unissued shares of Common Stock directly from the Company. If
the Company elects to purchase the shares on the open market or in privately
negotiated transactions, the price per share of Common Stock acquired through
such open market or privately negotiated transactions will be the weighted
average of the actual prices paid, computed to four decimal places, for all the
Common Stock purchased by the Agent in connection with such open market
purchases, without application of the Discount Rate. The Agent shall pay
brokerage commissions in an amount determined by the prevailing rates at the
time of purchase. Such commissions will be reimbursed by the Company, but in no
event shall the Company be obligated to pay commissions in excess of five
percent (5%) of the purchase price of the shares of Common Stock. Any
commissions in excess of five percent (5%) will by paid by the Participants on a
pro rata basis. Such open market purchases may be made, at the Agent's option,
on any securities exchange where the shares of Common Stock are traded, in the
over-the-counter market or in negotiated transactions with third persons, and
may be on such terms as to price, delivery, and otherwise as the Agent may
determine.

                  (3) Waiver of Maximum Cash Purchase Limitation . Cash
Purchases in excess of $5,000 may be made only upon acceptance in writing by the
Company of a completed written Request for Waiver form from the Participant. A
Request for Waiver must be received by the Company at its corporate address or
via facsimile at (505) 989-8156 no later than 2:00 p.m. New York City time on
the second business day preceding the relevant Pricing Period. Request for
Waiver forms may be obtained from the


                                        9

<PAGE>   11

Company by telephone at (505) 989-1900 or via the above facsimile number. The
Company may establish a discount rate different than the Discount Rate, ranging
from 0% to 5% (the "Waiver Discount") regarding shares purchased from the
Company for Cash Purchases exceeding $5,000 per month and approved by the
Company pursuant to a Request for Waiver. Participants may obtain the applicable
Waiver Discount by telephoning the Company at (888) 898-8601 three business days
prior to the first day of the Pricing Period. It is solely within the Company's
discretion as to whether any such approval for cash investments in excess of
$5,000 will be granted. In deciding whether to approve a Request for Waiver, the
Company will consider relevant factors including, but not limited to: whether
the Plan is then acquiring newly issued or treasury shares directly from the
Company or acquiring shares from third parties in the open market or in
privately negotiated transactions; the Company's need for additional funds; the
attractiveness of obtaining such additional funds through the sale of Common
Stock as compared to other sources of funds; the purchase price likely to apply
to any sale of Common Stock under the Plan; the Participant submitting the
request; the extent and nature of such Participant's prior participation in the
Plan; the number of shares of Common Stock held by such Participant and the
aggregate amount of cash investments for which Requests for Waiver have been
submitted by all Participants. If such requests are submitted for any Cash
Purchase Investment Date for an aggregate amount in excess of the amount the
Company is then willing to accept, the Company may honor such requests in order
of receipt, pro rata or by any other method that the Company determines in its
sole discretion to be appropriate. The Company anticipates that it will respond
to each Request for Waiver by the close of business (7:00 p.m. New York City
time) on the second business day preceding the relevant Pricing Period. Any
Request for Waiver accepted by the Company will be subject to all the terms and
conditions otherwise applicable to Cash Purchases, except those terms and
conditions expressly changed by this Section.

                  (4) Threshold Price. Notwithstanding anything contained herein
to the contrary, the Company may establish for each Pricing Period a threshold
price applicable to Cash Purchases made pursuant to Requests for Waiver approved
by the Company (the "Threshold Price"). The Threshold Price, if any, will be
established by the Company at least three business days prior to the first day
of the Pricing Period, and will be established in the Company's sole discretion
after a review of current market conditions and other relevant factors.
Participants may obtain the applicable Threshold Price and Waiver Discount by
telephoning the Company toll free at (888) 898-8601. The Threshold Price will be
a stated dollar amount that the average of the high and low sale prices of the
Common Stock on the New York Stock Exchange for a Trading Day of the Pricing
Period must equal or exceed. In the event that such Threshold Price is not
satisfied for a Trading Day of the Pricing Period, then such Trading Day and the
trading prices for that day will be excluded from (i) the Pricing Period and
(ii) the determination of the purchase price of the Common Stock for all cash
investments made pursuant to Requests for Waiver approved by the Company. Thus,
for example, if the Threshold Price is not satisfied for three of the twelve
Trading Days, then the purchase price of the Common Stock will be based upon the
remaining nine Trading Days for which the Threshold Price was satisfied.

         Each Trading Day of a Pricing Period for which the Threshold Price is
not satisfied will cause the return of a portion of any cash investments made
pursuant to Requests for Waiver approved by the Company. The returned amount
will equal one-twelfth of such cash investments for each Trading Day that the
Threshold Price is not satisfied. Thus, for example, if the Threshold Price is
not satisfied for three Trading Days, then 3/12 (i.e., 25%) of such cash
investments will be returned without interest.

         The Threshold Price and return procedure discussed above apply only to
Cash Purchases made pursuant to Requests for Waiver approved by the Company and
not to the reinvestment of dividends or Cash Purchases that do not exceed
$5,000.

                  (5) Cash Purchase Investment Date. The Cash Purchase
Investment Date for Cash Purchases will occur on or about the third from the
last business day of each month, or in the case of purchases in the open market,
no later than the last business day of each month. For a schedule of expected
Cash Purchase Due Dates and Cash Purchase Investment Dates through 1999, see
Schedule A of the Prospectus.

                  (6) Timing and Procedure for Cash Purchases. Each month the
Agent will apply a Cash Purchase for which good funds are timely received to the
purchase of shares of Common Stock for the account of the Participant on the
next Cash Purchase Investment Date. In order for funds to be invested on the
next Cash Purchase Investment Date, the Agent must have received the following
in a timely fashion: (i) the Authorization Form (if person is not yet enrolled
as a Participant) and the Broker and Nominee Form (if necessary) at least one
business day before the commencement of the Pricing Period; (ii) the Request for
Waiver (if applicable) no later than 2:00 p.m. New York City time two business
days before the commencement of the Pricing Period; and (iii) a check, money
order or wire transfer no later than one business day prior to the commencement
of the related Pricing Period (the "Cash Purchase Due Date") although the
Company may, within its sole discretion, accept such funds after the Cash
Purchase Due Date in cases of unanticipated delay or inadvertence by the
Participant. Such check, money order or wire transfer must have cleared before
the related Cash Purchase Investment Date. Wire transfers may be used only if
approved verbally in advance by the Agent, and instructions for Wire Transfers
can be obtained from the Agent. Checks and money orders are accepted subject to
timely collection as good funds and verification of compliance with the terms of
the Plan. Checks or money orders should be made payable to "Continental Stock
Transfer & Trust Company -- TMA Dividend Reinvestment and Stock Purchase Plan."
Checks returned for any


                                       10

<PAGE>   12

reason will not be resubmitted for collection. Generally, Cash Purchases
received more than ten business days before the commencement of the Pricing
Period or after the Cash Purchase Due Date will be returned to Participants
without interest at the end of the Pricing Period; such Cash Purchases may be
resubmitted by a Participant prior to the commencement of the next or a later
Pricing Period. Upon a Participant's written request received by the Agent no
later than two business days prior to the Pricing Period, a timely Cash Purchase
not already invested under the Plan will be canceled or returned to the
Participant as soon as practical. However, in the latter event, no refund of a
check or money order will be made until the funds have been actually received by
the Agent. Accordingly, such refunds may be delayed up to three weeks. In making
purchases for the Participant's Account, the Agent may commingle the
Participant's funds with those of other Participants in the Plan. NO INTEREST
WILL BE PAID ON FUNDS HELD BY THE AGENT PENDING INVESTMENT OR RETURN TO THE
PARTICIPANT. FUNDS FOR CASH PURCHASES DO NOT CONSTITUTE DEPOSITS OR SAVINGS
ACCOUNTS AND ARE NOT INSURED BY ANY GOVERNMENTAL AGENCY OR INSTRUMENTALITY.

FEDERAL INCOME TAX CONSEQUENCES.

         The following discussion summarizes the principal federal income tax
consequences, under current law, of participation in the Plan. It does not
address all potentially relevant federal income tax matters, including
consequences peculiar to persons subject to special provisions of the federal
income tax law (such as banks, insurance companies, and foreign persons). The
discussion is based on various rulings of the Internal Revenue Service (the
"IRS") regarding several types of dividend reinvestment plans. No ruling,
however, has been issued or requested regarding the Plan. THE FOLLOWING
DISCUSSION IS GENERAL INFORMATION ONLY, AND PARTICIPANTS MUST CONSULT THEIR OWN
TAX ADVISORS TO DETERMINE THE PARTICULAR TAX CONSEQUENCES THAT MAY RESULT FROM
PARTICIPATION IN THE PLAN AND THE DISPOSITION OF ANY SHARES OF COMMON STOCK
PURCHASED PURSUANT TO THE PLAN.

         REINVESTED DIVIDENDS. Participants in the Plan will be treated for
federal income tax purposes as having received, on the Dividend Reinvestment
Date, a distribution in an amount equal to the fair market value of the shares
of Common Stock acquired with reinvested dividends (plus a pro rata portion of
any brokerage cost incurred on open market purchases of the shares of Common
Stock). When shares of Common Stock are purchased directly from the Company, the
amount of the dividend will be the fair market value of the shares of Common
Stock, although the Participant will have acquired such shares of Common Stock
at the Discount Rate. In effect, the amount of the distribution for tax purposes
will equal the amount of the cash dividend plus the amount of the discount on
the purchase of the shares.

         Shares of Common Stock acquired for Participants in the Plan will have
an initial tax basis to the Participant equal to the amount the Participant is
treated as having received as a dividend. The holding period for a share of
Common Stock (including a fractional share) generally will begin on the day
after the Dividend Reinvestment Date upon which the share of Common Stock was
acquired.

         The reinvestment of dividends does not relieve the Participant of any
income tax and will constitute a dividend to the same extent that a cash
distribution would be so treated. Participants who are qualified pension or
profit sharing plans or individual retirement accounts should be able to
continue to exclude the reinvested dividends from unrelated business taxable
income unless such Participants have borrowed to acquire their shares of Common
Stock. The Agent will report to each Participant for tax purposes the dividends
to be credited to his account as well as any discounts or costs incurred by the
Company. Such information will also be furnished to the IRS to the extent
required by law. In addition, the Code imposes certain reporting obligations on
brokers and other intermediaries. As a result, the Agent will be required to
report to the IRS and the Participant any sale of Common Stock by it on behalf
of a Participant.

         CASH PURCHASES. The IRS is, as of the date hereof, considering the
appropriate treatment of Cash Purchases pursuant to a dividend reinvestment
plan. If the proper treatment of the discount afforded such Cash Purchases is
determined to be a distribution, Participants will be treated as having received
a distribution upon the purchase of Optional Cash Purchases and Initial Cash
Purchases in an amount equal to the excess, if any, of the fair market value of
the shares of Common Stock on the date on which they were acquired (plus a pro
rata portion of the brokerage cost incurred in open market purchases) over the
amount of the Optional Cash Purchases and Initial Cash Purchases. Such shares of
Common Stock will have an initial tax basis equal to the fair market value of
the shares of the Optional Cash Purchases and Initial Cash Purchases. The fair
market value on an acquisition date is likely to differ from the Market Price
for Cash Purchases for the pricing period immediately preceding the related Cash
Purchase (which determines the number of shares of Common Stock acquired). The
amount treated as a distribution will constitute a dividend for federal income
tax purposes to the same extent that a cash distribution would be so treated.
The holding period for a share of Common Stock (including fractions thereof)
generally begins on the day after the date that the share of Common Stock was
acquired.

         If the IRS determines that stock purchased at a discount through the
Cash Purchases is not a distribution, the Participant will take a tax basis in
the purchased stock equal to the actual purchase price paid to the Participant.


                                       11

<PAGE>   13

VOTING OF SHARES HELD UNDER THE PLAN

         Each Participant will be able to vote all shares of Common Stock
(including fractional shares) credited to the Participant's Account. The Agent
will not vote shares of Company Stock that it holds for a Participant's account
except as directed by the Participant.

CERTIFICATES

         Shares of Common Stock purchased under the Plan are registered in the
name of a nominee and shown on each Participant's Account Statement. However, a
Participant may request a certificate for any of the whole shares of Common
Stock which have accumulated in such Participant's Account by writing a letter
of instruction to the Agent. Each certificate issued will be registered in the
name or names in which the account is maintained, unless otherwise instructed in
writing. If the certificate is to be issued in a name other than the name on the
Participant's Account, the Participant or Participants must have his or her
signature(s) guaranteed by a commercial bank or a broker. Certificates for
fractional shares of Common Stock will not be issued in any case. Dividends will
continue to be paid on the cumulative holdings of both full and fractional
shares of Common Stock remaining in the Participant's Account and will
automatically be reinvested.

         Participants who wish to do so may deposit currently held certificates
registered in their names with the Agent for credit under the Plan. There is no
charge for such deposits and by making such deposit the Participant will be
relieved of the responsibility for loss, theft or destruction of the
certificate. Shares of Company Stock credited to a Participant's Account may not
be pledged or assigned, and any attempted pledge or assignment is void. A
Participant who wishes to pledge or assign shares of Company Stock credited to
the Participant's Account must first withdraw such shares of Company Stock from
the account.

TERMINATION OF PARTICIPATION.

         A Participant may terminate participation in the Plan at any time by
notifying the Agent in writing. Unless the termination notice is received by the
Agent at least two (2) business days prior to any Dividend Record Date or Cash
Purchase Investment Date, it cannot be processed until after purchases made from
the dividends paid or Cash Purchases submitted have been completed and credited
to the Participant's Account. All dividends with a record date after timely
receipt of notice for termination will be sent directly to the Participant. The
Agent may terminate the Account by notice in writing mailed to the Participant.
Once termination has been effected, the Agent will issue to the Participant,
without charge, certificates for the full shares of Common Stock held in the
Participant's Account or, if so requested, sell the full shares of Common Stock
held under the Plan, deduct brokerage commissions, transfer taxes and a service
charge (if any) and deliver the proceeds to the Participant. The value of the
Participant's interest in any fractional share of Common Stock held in his
account at termination will be paid by check, less the Participant's share of
any related expenses. A Participant will also be entitled to the uninvested
portion of any funds received for Optional Cash Purchases if notice of
termination is received prior to the date when the Agent becomes obligated to
pay for purchased shares of Common Stock.

         If a Participant disposes of all shares of Common Stock represented by
certificates registered in his own name on the books of the Company but does not
give notice of termination under the Plan, the Agent may continue to reinvest
the dividends on the shares of Common Stock under the Plan until otherwise
directed.

         A Participant who changes his or her address must notify the Agent
immediately. If a Participant changes residences to a state where the shares of
Common Stock offered pursuant to the Plan are not registered or exempt from
registration under applicable securities laws, the Company may deem the
Participant to have terminated participation in the Plan.

STOCK DIVIDENDS, STOCK SPLITS AND SHAREHOLDER RIGHTS OFFERINGS

         Any stock dividends or stock splits distributed by the Company on
shares of Common Stock held by the Agent for the Participant will be credited to
the Participant's Account. In the event the Company makes available to its
shareholders rights to purchase additional shares of Common Stock or other
securities, the Participant will receive appropriate instructions in connection
with all such rights directly from the Agent in order to permit a Participant to
determine what action he or she desires to take.

AGENT'S RESPONSIBILITIES

         The Agent shall not be liable hereunder for any act done in good faith,
or for any good faith omission to act, including without limitation, any claims
of liability (1) arising out of failure to terminate any Participant's Account
upon such Participant's death prior


                                       12

<PAGE>   14
to receipt of notice in writing of such death and (2) with respect to the prices
at which shares of Common Stock are purchased or sold for the Participant's
Account and the times such purchases or sales are made.

         All notices from the Agent to a Participant will be mailed to the
Participant's last address of record, which will satisfy the Agent's
responsibility to give notice.

AMENDMENTS TO THE PLAN

         The Plan may be amended or supplemented by the Agent or the Company at
any time or times, including the period between Dividend Record Date and the
related Dividend Reinvestment Date. Any such amendment may include an
appointment by the Agent of a successor agent under the terms and conditions
contained herein. Notice will be sent to Participants of any amendments as soon
as practicable after such action by the Company.

INTERPRETATION AND REGULATION OF THE PLAN

         THE COMPANY RESERVES THE RIGHT, WITHOUT NOTICE TO PARTICIPANTS, TO
INTERPRET AND REGULATE THE PLAN AS IT DEEMS NECESSARY OR DESIRABLE IN CONNECTION
WITH ITS OPERATION. ANY SUCH INTERPRETATION AND REGULATION SHALL BE CONCLUSIVE.

INQUIRIES ABOUT THE PLAN

         All correspondence and questions regarding the Plan, a Participant's
Account, and the Discount Rate, Waiver Rate, or Threshold Price should be
directed to:

             Thornburg Mortgage Asset Corporation                            
             Dividend Reinvestment and Stock Purchase Plan                   
             119 E. Marcy Street                                             
             Santa Fe, New Mexico 87501                                      
             Telephone: (505) 989-1900 or                                    
              toll free (888) 898-8601 (Discount Rate, Waiver Rate, 
                                        Threshold Price only)
             Facsimile: (505) 989-8156                                       
                                                                             
                      or                                                     
                                                                             
             TMA Dividend Reinvestment and Stock Purchase Plan               
             c/o Continental Stock Transfer & Trust Company                  
             2 Broadway, 19th Floor                                          
             New York, NY  10004                                             
             Telephone: (212) 509-4000                                       

                              PLAN OF DISTRIBUTION

         Except to the extent the Agent purchases Common Stock in open market
transactions, the Common Stock acquired under the Plan will be sold directly by
the Company through the Plan. The Company may sell Common Stock to Shareholders
(including brokers or dealers) who, in connection with any resales of such
shares, may be deemed to be underwriters. Such shares, including shares acquired
pursuant to Request for Waivers granted with respect to the Cash Payment feature
of the Plan, may be resold in market transactions (including coverage of short
positions) on any national securities exchange on which shares of Common Stock
trade or in privately negotiated transactions. The Common Stock is currently
listed on the New York Stock Exchange. Under certain circumstances, it is
expected that a portion of the shares of Common Stock available for issuance
under the Plan will be issued pursuant to such waivers. The difference between
the price such owners pay to the Company for Common Stock acquired under the
Plan, after deduction of the applicable discount from the Market Price for Cash
Purchases, and the price at which such shares are resold, may be deemed to
constitute underwriting commissions received by such owners in connection with
such transactions.

         Subject to the availability of shares of Common Stock registered for
issuance under the Plan, there is no total maximum number of shares that can be
issued pursuant to the reinvestment of dividends. From time to time, financial
intermediaries may engage in positioning transactions in order to benefit from
the discount from the Market Price for Dividend Reinvestments of Common Stock
acquired through the reinvestment of dividends under the Plan.


                                       13

<PAGE>   15

         Except with respect to open market purchases of Common Stock relating
to reinvested dividends or Cash Purchases, the Company will pay any and all
brokerage commissions and related expenses incurred in connection with purchases
of Common Stock under the Plan, up to 5% of the Market Price for Dividend
Reinvestments and the Market Price for Cash Purchases of the Common Stock. Upon
withdrawal by a Participant from the Plan by the sale of Common Stock held under
the Plan, the Participant will receive the proceeds of such sale less a nominal
fee per transaction paid to the Agent (if such resale is made by the Plan
Administrator at the request of a Participant), any related brokerage
commissions and any applicable transfer taxes.

         Common Stock may not be available under the Plan in all states. This
Prospectus does not constitute an offer to sell, or a soliciting of an offer to
buy, any Common Stock or other securities in any state or any other jurisdiction
to any person to whom it is unlawful to make such offer in such jurisdiction.

                                 INDEMNIFICATION

         Maryland General Corporation Law provides that a Maryland corporation
may indemnify any person who is or was serving at the request of the corporation
as a director, officer, partner, trustee, employee, or agent of another foreign
or domestic corporation, partnership, joint venture, trust or other enterprise
or employee benefit plan ("director"), that is made a party to any proceeding by
reason of service in that capacity unless it is established that the act or
omission of the director was material to the matter giving rise to the
proceeding and was committed in bad faith or was the result of active and
deliberate dishonesty; or the director actually received an improper personal
benefit in money, property or services; or, in the case of any criminal
proceeding, the director had reasonable cause to believe that the act or
omission was unlawful. Indemnification may be against judgments, penalties,
fines, settlements, and reasonable expenses actually incurred by the director in
connection with the proceeding, but if the proceeding was one by or in the right
of the corporation, indemnification may not be made in respect of any proceeding
in which the director shall be adjudged to be liable to the corporation. Such
indemnification may not be made unless authorized for a specific proceeding
after a determination has been made, in a manner prescribed by law, that
indemnification is permissible in the circumstances because the director has met
the applicable standard of conduct. The director must be indemnified for
expenses, however, if he has been successful in the defense of the proceeding or
as otherwise ordered by a court. The law also prescribes the circumstances under
which a corporation may advance expenses to, or obtain insurance or similar
cover for, directors.

         The Company's Articles of Incorporation provides for indemnification of
the officers and directors of the Company and eliminates the liability of a
director or officer to the Company or its Shareholders for money damages to the
fullest extent permitted by Maryland law.

         Insofar as indemnification of directors, officers and controlling
persons of the Registrant for liabilities arising under the Securities Act of
1933 may be permitted, pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission, such indemnification is against public policy as expressed in the
Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question of whether such
indemnification by the Registrant is against the public policy as expressed in
the Act and will be governed by the final adjudication of such issue.

                                  LEGAL OPINION

         The validity of the Common Stock offered hereby will be passed upon for
the Company by Jeffers, Wilson, Shaff & Falk, LLP, Irvine, California. Michael
B. Jeffers, a member of Jeffers, Wilson, Shaff & Falk, LLP is the Secretary of
the Company, owns 672 shares of Common Stock, owns 1% of the Thornburg Mortgage
Advisory Corporation, the Manager of the Company, and has been granted DERs for
2,861 shares of Common Stock and options to purchase 43,141 shares of Common
Stock.

                                     EXPERTS

         The financial statements of the Company, included as part of the
Company's Annual Report on Form 10-K for the year ended December 31, 1996 have
been audited by McGladrey & Pullen, LLP, independent certified public
accountants, as set forth in their report included therein and incorporated
herein by reference. Such financial statements, and audited financial statements
to be included in subsequently filed documents, will be incorporated herein in
reliance upon the reports of McGladrey & Pullen, LLP and upon their authority as
experts in auditing and accounting.


                                       14

<PAGE>   16

                                    GLOSSARY

         "Agent" means the administrator of the Plan, as of the date of this
prospectus, Continental Stock Transfer & Trust Company.

         "Authorization Form" means the form used to appoint the Agent as agent
for the Participant, to direct the Company to pay to the Agent such
Participant's cash dividends on Participating Shares and Plan Shares, and to
direct the Agent to purchase on the Dividend Reinvestment Date additional shares
of Common Stock with such dividends and to purchase on the relevant Cash
Purchase Investment Date additional shares of Common Stock with Cash Purchases.

         "Beneficial Owner" means a Shareholder who beneficially owns shares of
Company Stock that are registered in a name other than such Shareholder's name,
such as in the name of a broker, bank or other nominee.

         "Cash Purchase" means a voluntary cash investment in the Common Stock
of the Company through the Plan.

         "Cash Purchase Investment Date" means the date of investment of the
Cash Purchases, generally on or about the third from the last business day of
each month, or in the case of purchases on the open market, no later than the
last business day of each month.

         "Commission" means the Securities and Exchange Commission.

         "Common Stock" means the common stock, $.01 par value, of the Company.

         "Company" means Thornburg Mortgage Asset Corporation.

         "Company Stock" means the Common Stock and Preferred Stock of the
Company.

         "Discount Rate" means a discount ranging from 0% to 5% from the per
share Market Price for Dividend Reinvestments and the Market Price for Cash
Purchases on shares of newly issued Common Stock purchased by the Agent for the
Plan from the Company with reinvested dividends and funds from Cash Purchases
not in excess of the $5,000 limit.

         "Dividend Payment Date" means the dividend payment date announced by
the Company from time to time, as reflected through 1999 in Schedule "A".

         "Dividend Reinvestment Date" means the date of the reinvestment of
dividends paid on Plan Shares and Participating Shares of Company Stock,
generally on or within fifteen (15) days after the Dividend Payment Date except
where completion at a later date is necessary or advisable under applicable
securities laws. Under normal market conditions, the Company expects to reinvest
the funds on the Dividend Payment Date.

         "Exchange Act" means the Securities Exchange Act of 1934, as amended.

         "Initial Cash Purchase" means a Cash Purchase by a non-shareholder.

         "Market Price for Cash Purchases" means the average of the daily high
and low Sales Prices, computed to four decimal places, of the Shares of Common
Stock as reported on the NYSE during the Pricing Period prior to the related
Cash Purchase Investment Date.

         "Market Price for Dividend Reinvestments" means the average of the
daily high and low sales prices, computed to four decimal places, of the shares
of Common Stock as reported on the NYSE on the Dividend Reinvestment Date.

         "NYSE" means the New York Stock Exchange.

         "Optional Cash Purchase" means a Cash Purchase by a Shareholder.

         "Participant" means a Record Owner of the Company's Stock, the
Beneficial Owner of the Company's Stock whose bank, broker or other nominee
participates on the Beneficial Owners behalf, or a current non-shareholder who
wishes to participate in the Plan upon making an initial investment in the
Common Stock offered herein.

         "Participating Shares" means all or a specified number of shares of
Company Stock owned by the Participant.


                                       15

<PAGE>   17

         "Plan" means the Thornburg Mortgage Asset Corporation Dividend
Reinvestment and Stock Purchase Plan, as amended.

         "Plan Shares" means all whole and fractional shares of Common Stock
credited to a Participant's Plan account.

         "Preferred Stock" means the outstanding preferred stock of the Company.

         "Pricing Period" means the twelve Trading Days prior to the Cash
Purchases Investment Date for that month.

         "Securities Act" means the Securities Act of 1933, as amended.

         "Shareholder of Record" means a Shareholder who owns shares of Company
Stock in his or its own name.

         "Shareholders" means record owners of the Common Stock or Preferred
stock of the Company.

         "Threshold Price" means a minimum price applicable to the purchase of
newly issued shares of Common Stock purchased through cash investments made
pursuant to Requests for Waiver approved by the Company.

         "Trading Day" means any day other than Saturday, Sunday or a legal
holiday on which the NYSE is closed for trading or a day on which the Agent is
authorized or obligated by law to close.

         "Waiver Discount" means a discount ranging from 0% to 5% from the per
share Market Price on shares of newly issued Common Stock purchased by the Plan
from the Company with funds from Cash Purchases in excess of the $5,000 limit.


                                       16

<PAGE>   18
                                   SCHEDULE A

                           CALENDAR FOR CASH PURCHASES

<TABLE>
<CAPTION>

Threshold Price and
  Waiver Discount
     Set Date                  Cash Purchase           Pricing Period              Cash Purchase
(Waiver Request Date)             Due Date             Commencement Date           Investment Date
- ---------------------         ----------------         -----------------          -----------------
<S>                           <C>                      <C>                        <C>
November 4, 1997              November 6, 1997         November 7, 1997           November 25, 1997
December 5, 1997              December 9, 1997         December 10, 1997          December 29, 1997
January 6, 1998               January 8, 1998          January 9, 1998            January 28, 1998
February 3, 1998              February 5, 1998         February 6, 1998           February 25, 1998
March 6, 1998                 March 10, 1998           March 11, 1998             March 27, 1998
April 6, 1998                 April 8, 1998            April 9, 1998              April 28, 1998
May 5, 1998                   May 7, 1998              May 8, 1998                May 27, 1998
June 5, 1998                  June 9, 1998             June 10, 1998              June 26, 1998
July 8, 1998                  July 10, 1998            July 13, 1998              July 29, 1998
August 6, 1998                August 10, 1998          August 11, 1998            August 27, 1998
September 4, 1998             September 9, 1998        September 10, 1998         September 28, 1998
October 7, 1998               October 9, 1998          October 12, 1998           October 28, 1998
November 4, 1998              November 6, 1998         November 9, 1998           November 25, 1998
December 7, 1998              December 9, 1998         December 10, 1998          December 29, 1998
January 5, 1999               January 7, 1999          January 8, 1999            January 27, 1999
February 2, 1999              February 4, 1999         February 5, 1999           February 24, 1999
March 8, 1999                 March 10, 1999           March 11, 1999             March 29, 1999
April 7, 1999                 April 9, 1999            April 12, 1999             April 28, 1999
May 5, 1999                   May 7, 1999              May 10, 1999               May 26, 1999
June 7, 1999                  June 9, 1999             June 10, 1999              June 28, 1999
July 7, 1999                  July 9, 1999             July 12, 1999              July 28, 1999
August 6, 1999                August 10, 1999          August 11, 1999            August 27, 1999
September 7, 1999             September 9, 1999        September 10, 1999         September 28, 1999
October 6, 1999               October 8, 1999          October 11, 1999           October 27, 1999
</TABLE>

                      CALENDAR FOR DIVIDEND REINVESTMENTS

<TABLE>
<CAPTION>

Record Date                           Dividend Reinvestment Date
- -----------                           --------------------------
<S>                                   <C>
December 30, 1996                     January 12, 1998
March 31, 1997                        April 10, 1998
June 30, 1997                         July 10, 1998
September 30, 1997                    October 12, 1998
December 30, 1997                     January 11, 1999
March 31, 1999                        April 12, 1999
June 30, 1999                         July 12, 1999
September 30, 1999                    October 11, 1999
December 30, 1999                     January 10, 2000
</TABLE>


                                       17

<PAGE>   19
                                     PART II

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION:

<TABLE>
          <S>                                                     <C>
          Registration fee....................................     $ 7,110
          Listing Fees........................................       2,500
          Legal fees and expenses*............................      10,000
          Accounting fees and expenses*.......................       1,200
          Printing expenses*..................................       3,000
          Miscellaneous expenses*.............................       1,000
                                                                   -------
                  TOTAL EXPENSES..............................     $24,810
                                                                   =======
</TABLE>
- ------------------
 * estimated expenses

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

         Maryland General Corporation Law provides that a Maryland corporation
may indemnify any person who is or was serving at the request of the corporation
as a Affiliate, officer, partner, trustee, employee, or agent of another foreign
or domestic corporation, partnership, joint venture, trust or other enterprise
or employee benefit plan ("Affiliate"), that is made a party to any proceeding
by reason of service in that capacity unless it is established that the act or
omission of the Affiliate was material to the matter giving rise to the
proceeding and was committed in bad faith or was the result of active and
deliberate dishonesty; or the Affiliate actually received an improper personal
benefit in money, property or services; or, in the case of any criminal
proceeding, the Affiliate had reasonable cause to believe that the act or
omission was unlawful. Indemnification may be against judgments, penalties,
fines, settlements, and reasonable expenses actually incurred by the Affiliate
in connection with the proceeding, but if the proceeding was one by or in the
right of the corporation, indemnification may not be made in respect of any
proceeding in which the Affiliate shall be adjudged to be liable to the
corporation. Such indemnification may not be made unless authorized for a
specific proceeding after a determination has been made, in a manner prescribed
by law, that indemnification is permissible in the circumstances because the
Affiliate has met the applicable standard of conduct. The Affiliate must be
indemnified for expenses, however, if he has been successful in the defense of
the proceeding or as otherwise ordered by a court. The law also prescribes the
circumstances under which a corporation may advance expenses to, or obtain
insurance or similar cover for, Affiliates.

         The Company's Articles of Incorporation provide for indemnification of
the officers and directors of the Company and eliminate the liability of a
director or officer to the Company or its shareholders for money damages to the
fullest extent permitted by Maryland law.

ITEM 16. EXHIBITS.

<TABLE>
        <S>    <C>
         4.0   Dividend Reinvestment and Stock Purchase Plan

         5.0   Opinion of Jeffers, Wilson, Shaff & Falk, LLP, counsel to the
               Company

        20.1   Brochure to Shareholders with respect to Dividend Reinvestment 
               and Stock Purchase Plan

        20.3   Authorization Form for the Dividend Reinvestment and Stock 
               Purchase Plan, as of September 1997

        23.1   Consent of Counsel (included in Exhibit (5))

        23.2   Consent of McGladrey & Pullen, LLP

        24.0   Power of Attorney of Certain Officers and Directors (included on
               signature page)
</TABLE>


                                      II -1

<PAGE>   20

ITEM 17. UNDERTAKINGS

         A. The undersigned Registrant hereby undertakes:

            (1) To file, during any period in which offers or sales are being 
made, a post-effective amendment to this Registration Statement:

                (i)    To include any Prospectus required by Section 10(a)(3) of
                       the Securities Act of 1933;

                (ii)   To reflect in the Prospectus any facts or events arising 
                       after the effective date to the Registration Statement 
                       (or the most recent post-effective amendment thereof)
                       which, individually or in the aggregate, represent a 
                       fundamental change in the information set forth in the 
                       Registration Statement;

                (iii)  To include any material information with respect to the 
                       plan of distribution not previously disclosed in the 
                       Registration Statement or any material change to such
                       information in the Registration Statement;

         Provided, however, that paragraphs A(1)(i) and A(1)(ii) do not apply if
the information required to be included in a post-effective amendment by those
paragraphs is contained in the periodic reports filed by the Registrant pursuant
to Section 13 or 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the Registration Statement

                  (2) That, for the purpose of determining liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new Registration Statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof;

                  (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

         B. The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at the time shall be deemed to be the initial bona fide offering thereof.


                                      II -2

<PAGE>   21
                                   SIGNATURES

         Pursuant to the requirement of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Santa Fe, New Mexico, on September , 1997.

                                            THORNBURG MORTGAGE ASSET CORPORATION

                                            By: /s/ H. GARRETT THORNBURG, JR.
                                                --------------------------------
                                                H. Garrett Thornburg, Jr.
                                                Chairman of the Board

                                POWER OF ATTORNEY

         We, the undersigned directors and officers of Thornburg Mortgage Asset
Corporation, Inc., do hereby constitute and appoint H. Garrett Thornburg, Jr.
and Larry A. Goldstone, or either of them, acting individually, our true and
lawful attorneys and agents, to do any and all acts and things in our name and
behalf in our capacities as directors and officers and to execute any and all
instruments for us and in our names in the capacities indicated below, which
said attorneys and agents, or any one of them, may deem necessary or advisable
to enable said corporation to comply with the Securities Act of 1933, as
amended, and any rules, regulations, and requirements of the Securities and
Exchange Commission, in connection with this Registration Statement, including
specifically, but without limitation, power and authority to sign for us or any
of us in our names and in the capacities indicated below, any and all amendments
(including post-effective amendments) hereof; and we do hereby ratify and
confirm all that the said attorneys and agents, or any of them, shall do or
cause to be done by virtue hereof.

         Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated.

<TABLE>
<CAPTION>

       Name                                    Title                                   Date                   
       ----                                    -----                                   ----                   
<S>                                    <C>                                        <C>                        
/s/ H. GARRETT THORNBURG, JR.          Chairman of the Board                      September 23, 1997        
- ------------------------------------                                                                        
    H. Garrett Thornburg, Jr.                                                                               
                                                                                                            
/s/ LARRY A. GOLDSTONE                 Director and President                     September 23, 1997        
- ------------------------------------                                                                        
    Larry A. Goldstone                                                                                      
                                                                                                            
/s/ RICHARD P. STORY                   Chief Financial Officer and Treasurer      September 23, 1997        
- ------------------------------------   (Principal Accounting Officer)                                       
    Richard P. Story                                                                                        
                                                                                                            
/s/ DAVID A. ATER                      Director                                   September 23, 1997        
- ------------------------------------                                                                        
    David A. Ater                                                                                           
                                                                                                            
/s/ JOSEPH H. BADAL                    Director                                   September 23, 1997        
- ------------------------------------                                                                        
    Joseph H. Badal                                                                                         
                                                                                                            
/s/ OWEN M. LOPEZ                      Director                                   September 23, 1997        
- ------------------------------------                                                                        
    Owen M. Lopez                                                                                           
                                                                                                            
/s/ JAMES H. LORIE                     Director                                   September 23, 1997        
- ------------------------------------                                                                        
    James H. Lorie                                                                                          
                                                                                                            
/s/ STUART C. SHERMAN                  Director                                   September 23, 1997        
- ------------------------------------
    Stuart C. Sherman
</TABLE>


                                     III-3


<PAGE>   22
                                  EXHIBIT INDEX

<TABLE>
<CAPTION>

Exhibit
- -------
<S>       <C>
 4.0      Dividend Reinvestment and Stock Purchase Plan

 5.0      Opinion of Jeffers, Wilson, Shaff & Falk, LLP, counsel to the Company

20.1      Brochure to Shareholders with respect to Dividend Reinvestment and 
          Stock Purchase Plan

20.3      Authorization Form for the Dividend Reinvestment and Stock Purchase 
          Plan, as of September 1997

23.1      Consent of Counsel (included in Exhibit (5))

23.2      Consent of McGladrey & Pullen, LLP

24.0      Power of Attorney of Certain Officers and Directors (included on 
          signature page)
</TABLE>


<PAGE>   1
                                                                     EXHIBIT 4.0

                      THORNBURG MORTGAGE ASSET CORPORATION
                  DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN
                  AMENDED AND RESTATED AS OF SEPTEMBER 17, 1997

1.       PURPOSE OF THE PLAN.

         The purpose of the Thornburg Mortgage Asset Corporation (the "Company")
Dividend Reinvestment and Stock Purchase Plan (the "Plan") is to provide
existing shareholders (the "Shareholders") of the Company's outstanding common
and preferred stock (collectively the "Company Stock") and interested investors
who are not Shareholders with a convenient and economical method to purchase
shares of the Company's common stock (the "Common Stock") and to reinvest all or
a portion of their cash dividends on Company Stock in additional shares of
Common Stock. The Plan provides the Company with a means of raising additional
capital for operations on an economical basis. The Plan was originally adopted
on August 30, 1994, and is being amended and restated as of the date set forth
above.

2.       ADMINISTRATION

         The Plan will be administered by Continental Stock Transfer & Trust
Company (the "Agent"), the Transfer Agent and Registrar for the Company. As the
Agent for Shareholders participating in the Plan, the Agent will administer the
Plan in accordance with the terms and conditions of the Plan as set forth below.

         The Agent will establish an account under the Plan for each Participant
("Participant's Account"), and will credit to the Participant's Account cash
received by the Agent for the Participant from cash dividends paid on the shares
of Company Stock, including those full and fractional shares of Common Stock
(computed to four decimal places) acquired under the Plan, and all voluntary
cash contributions for Cash Purchases (as defined below) received by the Agent
from the Participant.

         As soon as practicable after the purchases of shares of Common Stock
have been completed, the Agent will send each Participant a statement of their
account ("Account Statement"). The Account Statement will confirm the
transaction and itemize any previous investment activity for the calendar year.
ACCOUNT STATEMENTS SHOULD BE RETAINED BY THE PARTICIPANT FOR HIS OR HER OWN
RECORDS.

3.       ADVANTAGES AND DISADVANTAGES OF THE PLAN

         (a)      Advantages

          o       The Plan provides Participants with the opportunity to
                  purchase additional shares of Common Stock, if desired, by
                  automatically reinvesting all or a portion of their cash
                  dividends on Company Stock in the dividend reinvestment
                  program.


                                        1

<PAGE>   2

                  In addition to the reinvestment of dividends, the Plan
                  provides Shareholders with the opportunity to make monthly
                  investments of Common Stock through optional cash purchases
                  ("Optional Cash Purchases"), subject to a minimum and maximum
                  amount. Optional Cash Purchases may be made by check, money
                  order, wire transfer, or electronic funds transfer from a
                  predesignated bank account. Optional Cash Purchases may be
                  made occasionally or at regular intervals on Cash Purchase
                  Investment Dates, as the Participant desires. Participants may
                  make Optional Cash Purchases even if dividends on their shares
                  of Common Stock are not being reinvested.

         o        The Plan also provides non-shareholders of the Company the
                  opportunity to become Participants by making an initial cash
                  investment (referred to as "Initial Cash Purchases" and,
                  collectively with Optional Cash Purchases, as "Cash
                  Purchases") in the Company's Common Stock, subject to a
                  minimum and maximum amount.

         o        Shares purchased directly from the Company through dividend
                  reinvestment under the Plan will be issued without a sales
                  commission and may be issued at a discount, ranging from 0% to
                  5% (the "Discount Rate") to the Market Price for Dividend
                  Reinvestments (as defined herein). If the Company should elect
                  that the shares of Common Stock to be purchased under the Plan
                  are to be purchased in the open market instead of directly
                  from the Company, the Company will pay any brokerage fees or
                  commissions on such purchases, up to 5% of the purchase price
                  of the shares of the Common Stock. Any commissions in excess
                  of 5% will be paid by the Participants on a pro rata basis.
                  The Discount Rate will not apply to open market purchases or
                  to privately negotiated purchases of Common Stock.

         o        Shares purchased directly from the Company for investment
                  through Cash Purchases under the Plan will be issued without a
                  sales commission and may be issued at the Discount Rate to the
                  Market Price for Cash Purchases (as defined herein). If the
                  Company elects that the shares of Common Stock to be purchased
                  under the Plan are to be purchased in the open market instead
                  of directly from the Company, the Company will pay any
                  brokerage fees or commissions on such purchases, up to 5% of
                  the purchase price of the shares of the Common Stock. Any
                  commissions in excess of 5% will be paid by the Participants
                  on a pro rata basis. The Discount Rate will not apply to open
                  market purchases or to privately negotiated purchases of
                  Common Stock.

         o        Funds invested in the Plan are fully invested through the
                  purchase of fractions of shares, as well as full shares, and
                  proportionate cash dividends on fractions of shares are used
                  to purchase additional shares.


                                        2

<PAGE>   3
          o       Participants may direct the Agent to transfer, at any time and
                  at no cost to the Participant, all or a portion of the
                  Participant's shares in the Plan to a Plan account for another
                  person.

          o       The Plan offers a "share safekeeping" service whereby, at no
                  cost, Participants may deposit their Company Stock
                  certificates with the Agent and have their ownership of such
                  Company Stock maintained on the Agent's records as part of
                  their Plan account.

          o       Participants will receive statements containing year-to-date
                  information on all Plan transactions in a Participant's
                  account within a reasonable time after a transaction occurs,
                  designed to simplify the Participants' record keeping.

         (b)      Disadvantages

          o       Participants in the Plan who reinvest dividends will be
                  treated for federal income tax purposes as having received a
                  dividend on the dividend payment date, as declared from time
                  to time by the Company, which occurs generally on the 10th day
                  of the first month following the last month of each calendar
                  quarter (the "Dividend Payment Date"); such dividend may give
                  rise to a tax payment obligation without providing the
                  Participant with immediate cash to pay such tax when it
                  becomes due. See "Tax Consequences."

          o       Participants will have limited control regarding the specific
                  timing of purchases and sales under the Plan. Because Cash
                  Purchases under the Plan will be made no earlier than twelve
                  business days following receipt of an investment instruction,
                  and because sales under the Plan will be effected by the Agent
                  only as soon as practicable after its receipt of such
                  instructions, a Participant may be unable to achieve the same
                  level of control over purchase and sale timing that they might
                  have for investments made outside the Plan.

          o       The Company may, in its sole discretion without prior notice
                  to Participants, change its determination as to whether shares
                  of Common Stock will be purchased by the Agent directly from
                  the Company or through open market or privately negotiated
                  purchases. No Discount Rate will be applied on shares
                  purchased under the Plan in the open market or in privately
                  negotiated purchases, instead of directly from the Company.
                  The Company may also, without prior notice to Participants,
                  lower or eliminate the Discount Rate on shares to be purchased
                  directly from the Company for future investment periods. As a
                  result, Participants will generally be unable to depend on the
                  availability of a market discount regarding shares acquired
                  under the Plan.


                                        3

<PAGE>   4
          o       No interest will be paid by the Company or the Agent on
                  dividends or funds for Cash Purchases held pending
                  reinvestment or investment or to be returned to the
                  Participant. In addition, Cash Purchases exceeding $5,000 per
                  month may be subject to return to the Participant (in whole or
                  proportionate part) without interest in the event that (i) a
                  threshold price has been established with respect to shares to
                  be purchased from the Company, and (ii) such threshold price
                  is not met for any day on which the New York Stock Exchange
                  ("NYSE") is open for trading ("Trading Day") during the twelve
                  Trading Days prior to the date scheduled for investment of
                  Cash Purchases for that month (the "Pricing Period").

          o       With respect to Cash Purchases (including Cash Purchases
                  exceeding $5,000 per month), while the Plan allows the Company
                  to establish a Discount Rate from the Market Price for Cash
                  Purchases, there can be no assurance that such Market Price
                  for Cash Purchases, as so discounted, will not be equal to or
                  greater than the purchase price of the shares on the relevant
                  date of the date of the investment of the Cash Purchases (the
                  "Cash Purchase Investment Date").

4.       ELIGIBILITY

         Participation in the Plan is open to any person or entity, whether or
not a Shareholder of the Company, who fulfills the requirements for
participation described below under "Enrollment Procedures." A Shareholder who
owns shares of Company Stock in his or its own name is referred to herein as a
"Shareholder of Record." A Shareholder of Record may participate directly in the
Plan. A Shareholder who beneficially owns shares of Company Stock that are
registered in a name other than such Shareholder's name (for example, where
shares are held in the name of a broker, bank or other nominee) is referred to
herein as a "Beneficial Owner." A Beneficial Owner may participate in the Plan
by either (i) becoming a Shareholder of Record by having one or more shares
transferred into their own name, or (ii) coordinating their participation with
their broker, bank or other nominee who is the record holder to participate on
their behalf. A prospective investor who holds no shares of Company Stock may
also participate, at their option, either directly or through a broker, bank or
other nominee by following the Enrollment Procedures described below.

         The Plan is intended for the benefit of investors in the Company and
not for persons or entities who accumulate accounts under the Plan over which
they have control for the purpose of exceeding the $5,000 per month maximum
without seeking the advance approval of the Company or who engage in
transactions that cause or are designed to cause aberrations in the price or
trading volume of the Common Stock. Notwithstanding anything in the Plan to the
contrary, the Company reserves the right to exclude from participation in the
Plan, at any time, (i) persons or entities who attempt to circumvent the Plan's
standard $5,000 per month maximum by accumulating accounts over which they have
control or (ii) any other persons or entities, as determined in the sole
discretion of the Company. For the purpose of this limitation, the Company
reserves the right to aggregate all Cash Purchases for Participants with more
than one account


                                        4

<PAGE>   5

using the same name, address or social security or taxpayer identification
number. For Participants unable to supply a social security or taxpayer
identification number, participation may be limited by the Company to only one
Plan account. Also for the purpose of such limitations, all Plan accounts that
the Company believes to be under common control or management or to have common
ultimate beneficial ownership may be aggregated. In the event the Company
exercises its right to aggregate investments and the result would be an
investment in excess of $5,000 without an approved Request for Waiver, the
Company will return, without interest, as promptly as practicable, any amount in
excess of the investment limitations.

5.       ENROLLMENT PROCEDURES

         After being furnished a copy of the Prospectus:

         (a) Shareholders of Record. Shareholders of Record may become
Participants by delivering a completed authorization form (the "Authorization
Form") to the Agent.

         (b) Beneficial Owners. Beneficial Owners are eligible to participate in
the Plan, however, such Beneficial Owners must instruct their broker, bank or
other nominee to complete and sign the Authorization Form and forward it to its
securities depository, which will provide the Agent with the information
necessary to allow the Beneficial Owner to participate in the Plan. To
facilitate participation by Beneficial Owners, the Plan is eligible for the
Depository Trust Dividend Reinvestment Services. A broker and nominee form (the
"Broker and Nominee Form") is required to be used for Cash Purchases of a
Beneficial Owner whose broker, bank or other nominee holds the Beneficial
Owner's shares in the name of a major securities depository. See "Broker and
Nominee Form" below.

         (c) Non-shareholders. Non-shareholders of the Company may become
Participants by directly delivering a completed Authorization Form to the Agent,
or through coordination with their broker, bank or other nominee as described in
(b) above for Beneficial Owners, along with an Initial Cash Purchase of not less
than $500 and not more than $5,000; provided, that Initial Cash Purchases of
more than $5,000 may be made if a Request for Waiver therefor is approved by the
Company.

         Participation in the Plan will begin upon receipt of a properly
completed Authorization Form and/or Broker and Nominee Form (and, in cases of
cash investments exceeding $5,000, receipt and approval by the Company of a
properly completed Request for Wavier). The funds for a Cash Purchase may be
submitted with the initial Authorization Form. Thereafter, it will not be
necessary to submit an additional Authorization Form and Cash Purchases may be
made monthly or, periodically, at the election of the Participant. See Section 8
for more details on Cash Purchases and Dividend Reinvestments.


                                        5

<PAGE>   6

         With respect to the dividend reinvestment portion of the Plan, the
Authorization Form (and the Broker Nominee Form if necessary) must be received
by the Agent at least two (2) calendar days prior to the Record Date established
for a particular dividend in order for a Shareholder to be eligible for
reinvestment of such dividends under the Plan for that related dividend,
otherwise, reinvestment will begin on the relevant date of the reinvestment of
dividends (the "Dividend Reinvestment Date") following the next record date.
With respect to Cash Purchases, the Agent must receive the Authorization Form,
good funds (as defined in Section 8(b)(vi)), and the Broker Nominee Form if
necessary, at least one business day prior to the commencement of the Pricing
Period in order for a Participant's Cash Purchase to be invested on the related
Cash Purchase Investment Date, otherwise, such authorization will be effective
as of the next Cash Purchase Investment Date and the funds will be returned to
the Participant as provided in Section 8b(vi).

6.       PARTICIPATION OPTIONS

         The Authorization Form provides for the purchase of additional shares
of Common Stock through the following participating options:

         (a) Full Dividend Reinvestment. If the "Full Dividend Reinvestment"
option is elected, the Agent will apply all cash dividends on all shares of
Company Stock then or subsequently registered in the Participant's name,
including all whole and fractional shares of Common Stock, together with any
voluntary cash contributions for Cash Purchases towards the purchase of
additional shares of Common Stock;

         (b) Partial Dividend Reinvestment. If the "Partial Dividend
Reinvestment" option is elected, the Agent will apply all cash dividends on the
number of shares of Company Stock then registered in the Participant's name and
designated in the appropriate space on the Authorization Form and all cash
dividends on shares of Common Stock purchased for the Participant's Account
pursuant to the Plan, together with any voluntary cash contributions for Cash
Purchases towards the purchase of additional shares of Common Stock; and

         (c) Cash Purchases Only. If "Cash Purchases Only" is elected, the Agent
will only apply the voluntary cash contributions for Cash Purchases received
from the Participant towards the purchase of additional shares of Common Stock.

         Under each of the options, any future cash dividends on shares of
Company Stock credited to the Participant's Account will be reinvested,
including dividends on shares of Common Stock purchased with any voluntary cash
contributions for Cash Purchases, until the Participant specifies otherwise or
the Participant's Account is terminated. Participants may change their
participation options at any time by requesting a new Authorization Form and
returning it to the Agent at the address set forth below. SHAREHOLDERS CURRENTLY
ENROLLED IN THE PLAN MAY CONTINUE TO PARTICIPATE IN THE PLAN WITHOUT ANY FURTHER
ACTION REQUIRED ON THEIR PART UNLESS THE PARTICIPANT WISHES TO CHANGE THE
PARTICIPATION OPTION PREVIOUSLY SELECTED.


                                        6

<PAGE>   7

7.       BROKER AND NOMINEE FORM

         The Broker and Nominee Form provides the only means by which a broker,
bank or other nominee holding shares of a Beneficial Owner, or planning to hold
shares of an interested investor who is not currently a Shareholder of the
Company, in the name of a major securities depository may invest Cash Purchases
within the minimum and maximum investment limitation established for the Plan
(see "Purchase and Price of Shares" below) on behalf of such Beneficial Owner or
interested investor. A Broker and Nominee Form must be delivered to the Agent
each time such broker, bank or other nominee transmits Cash Purchases. Broker
and Nominee Forms will be furnished at any time upon request to the Agent.

         The Broker and Nominee Form and appropriate instructions must be
received by the Agent not later than 12:00 Noon New York City time on the
business day immediately preceding the relevant Pricing Period (as defined below
under "Purchase and Price of Shares") in order to be invested on the Cash
Purchase Investment Date; otherwise the Cash Purchase will be returned, without
interest.

         Shares issued pursuant to a properly completed Broker and Nominee Form
will not be deemed Plan Shares, therefore, subsequent dividends will be paid in
cash unless otherwise instructed by the Beneficial Owner (See "Enrollment
Procedures" above for a discussion of the requirements for Beneficial Owner
participation in the reinvestment of dividends).

8.       PURCHASE OF AND PRICE OF SHARES.

         (a) Dividend Reinvestment. The Agent will apply cash credited to the
Participant's Account pursuant to Paragraph 5 above to the purchase of full
and/or fractional interests in shares of Common Stock and will credit the number
of shares of Common Stock so purchased to the Participant's Account. The Agent
will apply such funds toward the purchase of shares of Common Stock in the open
market or from authorized but unissued shares of Common Stock for the
Participant's Account.

                  (i) Discount Rate on Dividend Reinvestments. The price of the
authorized but unissued shares of Common Stock purchased by the Agent directly
from the Company pursuant to the reinvestment of dividends will be issued at the
Discount Rate to the then current Market Price for Dividend Reinvestments (as
defined below) as of the Dividend Reinvestment Date. The Discount Rate is
subject to change for future dividend reinvestments, or complete discontinuance
at the Company's discretion, without prior notice to the Participants after a
review of current market conditions, the level of participation in the Plan and
the Company's current and projected capital needs. The Discount Rate will only
be in effect for purchases of shares of Common Stock directly from the Company;
if the Company elects to purchase the shares in the open market or in privately
negotiated transactions, the Discount Rate will not be applied to such purchases
for the Participant's Account.


                                        7

<PAGE>   8

                  (ii) Price per Share for Reinvested Dividends. The "Market
Price for Dividend Reinvestments" per share of Common Stock acquired directly
from the Company shall be the average of the daily high and low sales prices,
computed to four decimal places, of the shares of Common Stock as reported on
the NYSE on the Dividend Reinvestment Date, or if no trading occurs in the
Common Stock on the Dividend Reinvestment Date, the average of the high and low
sales prices for the first Trading Day immediately preceding the Dividend
Reinvestment Date for which trades are reported. If the Company elects to
purchase the shares on the open market or in privately negotiated transactions,
the price per share of Common Stock acquired through such open market or
privately negotiated transactions will be the weighted average of the actual
prices paid, computed to four decimal places, for all the Common Stock purchased
by the Agent in connection with such open market purchases, without application
of the Discount Rate. The Agent shall pay brokerage commissions in an amount
determined by the prevailing rates at the time of purchase. Such commissions
will be reimbursed by the Company, but in no event shall the Company be
obligated to pay commissions in excess of five percent (5%) of the purchase
price of the shares of Common Stock. Any commissions in excess of five percent
(5%) will be paid by the Participants on a pro rata basis. Such open market
purchases may be made, at the Agent's option, on any securities exchange where
the shares of Common Stock are traded, in the over-the-counter market or in
negotiated transactions with third persons, and may be on such terms as to
price, delivery, and otherwise as the Agent may determine.

                  (iii) Dividend Reinvestment Date. The Dividend Reinvestment
Date will be on or within fifteen (15) days after the Dividend Payment Date
except where completion at a later date is necessary or advisable under
applicable securities laws. Under normal market conditions, the funds are
expected to be reinvested on the Dividend Payment Date. For a schedule of
expected Dividend Reinvestment Dates through 1998, see Schedule A of the
Prospectus.

         (b) Cash Purchases. A Shareholder may also make Optional Cash Purchases
of shares of Common Stock, subject to a minimum of $100 and a maximum of $5,000
(except in cases covered by a Request for Waiver as discussed below). New
investors, not currently Shareholders of the Company, may make Initial Cash
Purchases subject to a minimum of $500 and a maximum of $5,000 (except in cases
covered by a Request for Waiver). For purposes of these limitations on Cash
Purchases, all Plan Accounts under the common control or management of a
Participant may be aggregated at the Company's sole discretion.

                  (i) Discount Rate on Cash Purchases. The price of the
authorized but unissued shares of Common Stock purchased by the Agent directly
from the Company for Cash Purchases not in excess of the $5,000 maximum will be
issued at the Discount Rated to the then current Market Price for Cash Purchases
as of the Cash Purchase Investment Date. The Discount Rate is subject to change
for future investment periods, or complete discontinuance at the Company's
discretion, without prior notice to the Participants after a review of current
market conditions, the level of participation in the Plan and the Company's
current and projected capital needs. The Discount Rate will only be in effect
for purchases of shares of Common Stock directly from the


                                        8

<PAGE>   9
Company; the Discount Rate will not be applied to purchases for the
Participant's Account in the open market or in privately negotiated
transactions.

                  (ii) Price per Share for Cash Purchases. The "Market Price for
Cash Purchases" per share shall be the average of the daily high and low sales
prices, computed to four decimal places, of the shares of Common Stock as
reported on the NYSE during the Pricing Period prior to the related Cash
Purchase Investment Date. No commission shall be paid with respect to purchases
of authorized but unissued shares of Common Stock directly from the Company. If
the Company elects to purchase the shares on the open market or in privately
negotiated transactions, the price per share of Common Stock acquired through
such open market or privately negotiated transactions will be the weighted
average of the actual prices paid, computed to four decimal places, for all the
Common Stock purchased by the Agent in connection with such open market
purchases, without application of the Discount Rate. The Agent shall pay
brokerage commissions in an amount determined by the prevailing rates at the
time of purchase. Such commissions will be reimbursed by the Company, but in no
event shall the Company be obligated to pay commissions in excess of five
percent (5%) of the purchase price of the shares of Common Stock. Any
commissions in excess of five percent (5%) will by paid by the Participants on a
pro rata basis. Such open market purchases may be made, at the Agent's option,
on any securities exchange where the shares of Common Stock are traded, in the
over-the-counter market or in negotiated transactions with third persons, and
may be on such terms as to price, delivery, and otherwise as the Agent may
determine.

                  (iii) Waiver of Maximum Cash Purchase Limitation. Cash
Purchases in excess of $5,000 may be made only upon acceptance in writing by the
Company of a completed written Request for Waiver form from the Participant. A
Request for Waiver must be received by the Company at its corporate address or
via facsimile at (505) 989-8156 no later than 2:00 p.m. New York City time on
the second business day preceding the relevant Pricing Period. Request for
Waiver forms may be obtained from the Company. The Company may establish a
discount rate different than the Discount Rate, ranging from 0% to 5% (the
"Waiver Discount") regarding shares purchased from the Company for Cash
Purchases exceeding $5,000 per month and approved by the Company pursuant to a
Request for Waiver. Participants may obtain the applicable Waiver Discount by
telephoning the Company three business days prior to the first day of the
Pricing Period. It is solely within the Company's discretion as to whether any
such approval for cash investments in excess of $5,000 will be granted. In
deciding whether to approve a Request for Waiver, the Company will consider
relevant factors including, but not limited to: whether the Plan is then
acquiring newly issued or treasury shares directly from the Company or acquiring
shares from third parties in the open market or in privately negotiated
transactions; the Company's need for additional funds; the attractiveness of
obtaining such additional funds through the sale of Common Stock as compared to
other sources of funds; the purchase price likely to apply to any sale of Common
Stock under the Plan; the Participant submitting the request; the extent and
nature of such Participant's prior participation in the Plan; the number of
shares of Common Stock held by such Participant and the aggregate amount of cash
investments for which Requests for Waiver have been submitted by all
Participants. If such requests are submitted for


                                        9

<PAGE>   10

any Cash Purchase Investment Date for an aggregate amount in excess of the
amount the Company is then willing to accept, the Company may honor such
requests in order of receipt, pro rata or by any other method that the Company
determines in its sole discretion to be appropriate. The Company anticipates
that it will respond to each Request for Waiver by the close of business (7:00
p.m. New York City time) on the second business day preceding the relevant
Pricing Period. Any Request for Waiver accepted by the Company will be subject
to all the terms and conditions provide in Section 8.b above, except those terms
and conditions expressly changed by this Section.

                  (iv) Threshold Price. Notwithstanding anything contained
herein to the contrary, the Company may establish for each Pricing Period a
threshold price applicable to the purchase of newly issued shares of Common
Stock purchased through cash investments made pursuant to Requests for Waiver
approved by the Company (the "Threshold Price"). The Threshold Price, if any,
will be established by the Company at least three business days prior to the
first day of the Pricing Period, and will be established in the Company's sole
discretion after a review of current market conditions and other relevant
factors. Participants may obtain the applicable Threshold Price and Discount
Waiver by telephoning the Company. The Threshold Price will be a stated dollar
amount that the average of the high and low sale prices of the Common Stock on
the New York Stock Exchange for a Trading Day of the Pricing Period must equal
or exceed. In the event that such Threshold Price is not satisfied for a Trading
Day of the Pricing Period, then such Trading Day and the trading prices for that
day will be excluded from (i) the Pricing Period and (ii) the determination of
the purchase price of the Common Stock for all cash investments made pursuant to
Requests for Waiver approved by the Company. Thus, for example, if the Threshold
Price is not satisfied for three of the twelve Trading Days, then the purchase
price of the Common Stock will be based upon the remaining nine Trading Days for
which the Threshold Price was satisfied.

         Each Trading Day of a Pricing Period for which the Threshold Price is
not satisfied will cause the return of a portion of any cash investments made
pursuant to Requests for Waiver approved by the Company. The returned amount
will equal one-twelfth of such cash investments for each Trading Day that the
Threshold Price is not satisfied. Thus, for example, if the Threshold Price is
not satisfied for three Trading Days, then 3/12 (i.e., 25%) of such cash
investments will be returned without interest.

         The Threshold Price and return procedure discussed above apply only to
Cash Purchases made pursuant to Requests for Waiver approved by the Company and
not to the reinvestment of dividends or Cash Purchases that do not exceed
$5,000.

                  (v) Cash Purchase Investment Date. The Cash Purchase
Investment Date for Cash Purchases will occur on or about the third from the
last business day of each month, or in the case of purchases in the open market,
no later than the last business day of each month. For a schedule of expected
Cash Purchase Due Dates and Cash Purchase Investment Dates through 1998, see
Schedule A of the Prospectus.


                                       10

<PAGE>   11

                  (vi) Timing and Procedure for Cash Purchases. Each month the
Agent will apply a Cash Purchase for which good funds are timely received to the
purchase of shares of Common Stock for the account of the Participant on the
next Cash Purchase Investment Date. In order for funds to be invested on the
next Cash Purchase Investment Date, the Agent must have received the following
in a timely fashion: (i) the Authorization Form (if purchaser has not yet
enrolled as a Participant) and the Broker and Nominee Form (if necessary) at
least one business day before the commencement of the Pricing Period; (ii) the
Request for Waiver (if applicable) no later than 2:00 p.m. New York City time
two business days before the commencement of the Pricing Period; and (iii) a
check, money order or wire transfer no later than one business day prior to the
commencement of the related Pricing Period (the "Cash Purchase Due Date")
although the Company may, within its sole discretion, accept funds for Cash
Purchases after the Cash Purchase Due Date in the event of unanticipated delays
or inadvertence by the Participant. Such check, money order or wire transfer
must have cleared before the related Cash Purchase Investment Date. Wire
transfers may be used only if approved verbally in advance by the Agent, and
instructions for Wire Transfers can be obtained from the Agent. Checks and money
orders are accepted subject to timely collection as good funds and verification
of compliance with the terms of the Plan. Checks or money orders should be made
payable to "Continental Stock Transfer & Trust Company -- TMA Dividend
Reinvestment and Stock Purchase Plan." Checks returned for any reason will not
be resubmitted for collection. Generally, funds received for Cash Purchases
which are not invested under the Plan will be returned to Participants without
interest at the end of the Pricing Period; such Cash Purchases may be
resubmitted by a Participant prior to the commencement of the next or a later
Pricing Period. Upon a Participant's written request received by the Agent no
later than two business days prior to the Pricing Period, a timely Cash Purchase
not already invested under the Plan will be canceled or returned to the
Participant as soon as practical. However, in the latter event, no refund of a
check or money order will be made until the funds have been actually received by
the Agent. In making purchases for the Participant's Account, the Agent may
commingle the Participant's funds with those of other Participants in the Plan.
NO INTEREST WILL BE PAID ON FUNDS HELD BY THE AGENT PENDING INVESTMENT OR RETURN
TO THE PARTICIPANT. FUNDS FOR CASH PURCHASES DO NOT CONSTITUTE DEPOSITS OR
SAVINGS ACCOUNTS AND ARE NOT INSURED BY ANY GOVERNMENTAL AGENCY OR
INSTRUMENTALITY.

9.       INCOME TAX.

         The following discussion summarizes the principal federal income tax
consequences, under current law, of participation in the Plan. It does not
address all potentially relevant federal income tax matters, including
consequences peculiar to persons subject to special provisions of the federal
income tax law (such as banks, insurance companies, and foreign persons). The
discussion is based on various rulings of the Internal Revenue Service (the
"IRS") regarding several types of dividend reinvestment plans. No ruling,
however, has been issued or requested regarding the Plan. THE FOLLOWING
DISCUSSION IS GENERAL INFORMATION ONLY, AND PARTICIPANTS MUST CONSULT THEIR OWN
TAX ADVISORS TO DETERMINE THE PARTICULAR TAX CONSEQUENCES THAT MAY RESULT FROM
PARTICIPATION IN THE PLAN AND THE DISPOSITION OF ANY SHARES OF COMMON STOCK
PURCHASED PURSUANT TO THE PLAN.


                                       11

<PAGE>   12

         (a) Reinvested Dividends. Participants in the Plan will be treated for
federal income tax purposes as having received, on the Dividend Reinvestment
Date, a distribution in an amount equal to the fair market value on the date the
shares of Common Stock are acquired with reinvested dividends (plus a pro rata
portion of any brokerage cost incurred in the open market purchases of the
shares of Common Stock). For tax purposes, the dividend received will equal the
amount of the cash dividend plus the amount of the discount on the purchase of
the stock. When shares of Common Stock are purchased directly from the Company,
the amount of the dividend will be the full fair market value of the shares of
Common Stock as of the Dividend Reinvestment Date, although the Participant may
have acquired such shares of Common Stock at the Discount Rate.

         Shares of Common Stock acquired for Participants in the Plan will have
an initial tax basis to the Participant equal to the amount the Participant is
treated as having received as a dividend. The holding period for a share of
Common Stock (including a fractional share) generally will begin on the day
after the Dividend Reinvestment Date upon which the share of Common Stock was
acquired.

         The reinvestment of dividends does not relieve the Participant of any
income tax and will constitute a dividend to the same extent that a cash
distribution would be so treated. Participants who are Qualified Plans or IRAs
should be able to continue to exclude the reinvested dividends from unrelated
business taxable income unless such Participants have borrowed to acquire their
shares of Common Stock. The Agent will report to each Participant for tax
purposes the dividends to be credited to the account as well as any discounts or
costs incurred by the Company. Such information will also be furnished to the
IRS to the extent required by law. In addition, the Internal Revenue Code
imposes certain reporting obligations on brokers and other intermediaries. As a
result, the Agent will be required to report to the IRS and the Participant any
sale of Common Stock by it on behalf of a Participant.

         (b) Cash Purchases. The IRS is, as of the date hereof, considering the
appropriate treatment of Cash Purchases pursuant to a dividend reinvestment
plan. If the proper treatment of the discount afforded such Cash Purchases is
determined to be a distribution, Participants will be treated as having received
a distribution upon the purchase of Cash Purchases in an amount equal to the
excess, if any, of the fair market value of the shares of Common Stock on the
date on which they were acquired (plus a pro rata portion of the brokerage cost
incurred in open market purchases) over the amount of the Cash Purchases. Such
shares of Common Stock will have an initial tax basis equal to the amount of the
Cash Purchases plus the excess, if any, of the fair market value of the shares
of Common Stock purchased over the amount of the Cash Purchases. The fair market
value on an acquisition date is likely to differ from the Market Price for Cash
Purchases for the pricing period immediately preceding the related Cash Purchase
(which determines the number of shares of Common Stock acquired). The amount
treated as a distribution will constitute a dividend for federal income tax
purposes to the same extent that a cash distribution would be so treated. The
holding period for a share of Common Stock (including


                                       12

<PAGE>   13

fractions thereof) generally begin on the day after the Cash Purchase Investment
Date upon which the share of Common Stock was acquired.

         If the IRS determines that stock purchased at a discount through the
Cash Purchases is not a distribution, then the amount of the discount would not
represent a dividend and the Participant would take a tax basis in the purchased
stock equal to the actual purchase price paid to the Participant.

10.      VOTING.

         The Agent will not vote shares of Common Stock that it holds for a
Participant's Account except as directed by the Participant.

11.      CERTIFICATES.

         Shares of Common Stock purchased under the Plan are registered in the
name of a nominee and shown on each Participant's Account Statement. However, a
Participant may request a certificate for any of the whole shares of Common
Stock which have accumulated in such Participant's Account by writing a letter
of instruction to the Agent. Each certificate issued will be registered in the
name or names in which the account is maintained, unless otherwise instructed in
writing. If the certificate is to be issued in a name other than the name on the
Participant's Account, the Participant or Participants must have his or her
signature(s) guaranteed by a commercial bank or a broker. Certificates for
fractional shares of Common Stock will not be issued in any case. Dividends will
continue to be paid on the cumulative holdings of both full and fractional
shares of Common Stock remaining in the Participant's Account and will
automatically be reinvested.

         Participants who wish to do so may deposit Company Stock certificates
registered in their names with the Agent for credit under the Plan. There is no
charge for such deposits and by making such deposit the Participant will be
relieved of the responsibility for loss, theft or destruction of the
certificate.

         Shares of Company Stock credited to a Participant's Account may not be
pledged or assigned, and any attempted pledge or assignment is void. A
Participant who wishes to pledge or assign shares of Common Stock credited to
the Participant's Account must first withdraw such shares of Common Stock from
the account.

12.      TERMINATION OF PARTICIPATION.

         A Participant's Account may be terminated at any time by notifying the
Agent in writing. With respect to the reinvestment of dividends, unless the
termination notice is received by the Agent at least two (2) business days prior
to any Dividend Record Date, it cannot be processed until after purchases made
from the dividends paid have been completed and credited to


                                       13

<PAGE>   14

Participant's Account. All dividends with a record date after timely receipt of
notice for termination will be sent directly to the Participant. With respect to
the investment of Cash Purchases, unless the termination notice is received by
the Agent at least two (2) business days prior to the commencement of the
Pricing Period, it cannot be processed until after any funds received for Cash
Purchases for that Cash Purchase Investment Date have been invested. The Agent
may terminate the account by notice in writing mailed to the Participant. Once
termination has been effected, the Agent will issue to the Participant, without
charge, certificates for the full shares of Common Stock held in the account or,
if the Participant so requests, sell the full shares of Common Stock held under
the Plan, deduct brokerage commissions, transfer taxes and a service charge (if
any) and deliver the proceeds to the Participant. The Participant's interest in
any fractional share of Common Stock held in his account at termination will be
paid in cash based on the average of the daily high and low sales price computed
to four decimal places, of the shares of Common Stock as reported on the NYSE on
the date of termination. A Participant will also be entitled to the uninvested
portion of any funds received for Cash Purchases if notice of termination is
received prior to the date when the Agent becomes obligated to pay for purchased
shares of Common Stock.

         If a Participant disposes of all shares of Company Stock represented by
certificates registered in his own name on the books of the Company but does not
give notice of termination under the Plan, the Agent may continue to reinvest
the dividends on his shares of Company Stock under the Plan until otherwise
directed.

         A Participant who changes his or her address must notify the Agent
immediately. If a Participant changes residences to a state where the shares of
Common Stock offered pursuant to the Plan are not registered or exempt from
registration under applicable securities laws, the Company may deem the
Participant to have terminated participation in the Plan.

13.      STOCK DIVIDENDS.

         Any stock dividends or stock splits distributed by the Company on
shares of Company Stock held by the Agent for the Participant will be credited
to the Participant's Account. In the event the Company makes available to its
Shareholders rights to purchase additional shares of Common Stock or other
securities, the Participant will receive appropriate instructions in connection
with all such rights directly from the Agent in order to permit a Participant to
determine what action he desires to take.

14.      RESPONSIBILITY OF THE AGENT.

         The Agent shall not be liable hereunder for any act done in good faith,
or for any good faith omission to act, including without limitation, any claims
of liability (1) arising out of failure to terminate any Participant's Account
upon such Participant's death prior to receipt of notice in writing of such
death and (2) with respect to the prices at which shares of Common Stock are
purchased or sold for the Participant's Account and the times such purchases or
sales are made.


                                       14

<PAGE>   15

15.      AMENDMENT OF PLAN.

         The Plan may be amended or supplemented by the Agent or the Company at
any time or times, including the period between Dividend Record Date and the
relisted Dividend Reinvestment Date. Any such amendment may include an
appointment by the Agent in its place and stead a successor Bank or other agent
under these terms and conditions. Notice will be sent to Participants of any
amendments as soon as practicable after such action by the Company.

16.      APPLICABLE LAW.

         The terms and conditions of this authorization shall be governed by the
laws of the State of Maryland.

17.      EFFECTIVE DATE.

         The date of the adoption of the amended and restated Plan is September
17, 1997 and it shall be effective for the first monthly Cash Purchase option on
the November 25, 1997 Cash Purchase Investment Date.

18.      PLAN OF DISTRIBUTION.

         Except to the extent the Agent purchases Common Stock in open market
transactions, the Common Stock acquired under the Plan will be sold directly by
the Company through the Plan. The Company may sell Common Stock to Shareholders
(including brokers or dealers) who, in connection with any resales of such
shares, may be deemed to be underwriters. Such shares, including shares acquired
pursuant to Request for Waivers granted with respect to the Cash Purchase
feature of the Plan, may be resold in market transactions (including coverage of
short positions) on any national securities exchange on which shares of Common
Stock trade or in privately negotiated transactions. The Common Stock is
currently listed on the New York Stock Exchange. Under certain circumstances, it
is expected that a portion of the shares of Common Stock available for issuance
under the Plan will be issued pursuant to such waivers. The difference between
the price such owners pay to the Company for shares of Common Stock acquired
under the Plan, after deduction of the applicable discount from the Market Price
for Cash Purchases, and the price at which such shares are resold, may be deemed
to constitute underwriting commissions received by such owners in connection
with such transactions.

         Subject to the availability of shares of Common Stock registered for
issuance under the Plan, there is no total maximum number of shares that can be
issued pursuant to the reinvestment of dividends. From time to time, financial
intermediaries may engage in positioning transactions in order to benefit from
the discount from the Market Price for Dividend Reinvestments of Common Stock
acquired through the reinvestment of dividends under the Plan.


                                       15

<PAGE>   16

         Except with respect to open market purchases of Common Stock relating
to reinvested dividends or Cash Purchases, the Company will pay any and all
brokerage commissions and related expenses incurred in connection with purchases
of Common Stock under the Plan, up to 5% of the Market Price for the Dividend
Reinvestments or Market Price for Cash Purchases of the Common Stock. Upon
withdrawal by a Participant from the Plan by the sale of Common Stock held under
the Plan, the Participant will receive the proceeds of such sale less a nominal
fee per transaction paid to the Agent (if such resale is made by the Plan
Administrator at the request of a Participant), any related brokerage
commissions and any applicable transfer taxes.

         Common Stock may not be available under the Plan in all states. This
Prospectus does not constitute an offer to sell, or a soliciting of an offer to
buy, any Common Stock or other securities in any state or any other jurisdiction
to any person to whom it is unlawful to make such offer in such jurisdiction.

19.      INQUIRIES REGARDING THE PLAN

         All correspondence and questions regarding the Plan, a Participant's
Account or the Discount Rate, Waiver Rate, or Threshold Price should be directed
to:

         Thornburg Mortgage Asset Corporation
         119 E. Marcy Street
         Santa Fe, New Mexico 87501
         Telephone: (505) 989-1900
                    (888) 898-8601
         Facsimile: (505) 989-8156
         Attn:      Treasurer

                  or

         TMA Dividend Reinvestment and Stock Purchase Plan
         Continental Stock Transfer & Trust Company
         2 Broadway
         19th Floor
         New York NY 10004
         Telephone: (212) 509-4000
         Facsimile: (212) 509-5152


                                       16

<PAGE>   17

20.      EXECUTION.

         To record the adoption of the Amended Plan as of September 17, 1997,
the Company has caused this Amended Plan to be executed in the name and on
behalf of the Company by a duly authorized officer.

                                           THORNBURG MORTGAGE ASSET CORPORATION,
                                           a Maryland corporation



                                            By: /s/ LARRY A. GOLDSTONE
                                                --------------------------------
                                                 Larry A. Goldstone, President



                                       17


<PAGE>   1
                                                                     EXHIBIT 5.0


                       JEFFERS, WILSON, SHAFF & FALK, LLP
                                ATTORNEYS AT LAW
                             18881 VON KARMAN AVENUE
                                   SUITE 1400
                            IRVINE, CALIFORNIA 92612
                            TELEPHONE: (714) 660-7700
                            FACSIMILE: (714) 660-7799


                               September 18, 1997


Thornburg Mortgage Asset Corporation
119 East Marcy Street
Santa Fe, New Mexico 87501

         Re: Sale of Shares Pursuant to the Dividend Reinvestment and Stock 
             Purchase Plan

Gentlemen:

         We have examined a copy of the Registration Statement on Form S-3 (the
"Registration Statement") of Thornburg Mortgage Asset Corporation, a Maryland
corporation (the "Company"), for the registration under the Securities Act of
1933 of the sale of up to 1,000,000 shares of the Company's Common Stock, par
value $.01 per share (the "Shares") pursuant to the Company's Dividend
Reinvestment and Stock Purchase Plan, as amended (the "Plan"). We have also
examined the Articles of Incorporation, as amended, and such other corporate
records, including the resolutions of the Company's Board of Directors, and such
other documents as we have deemed necessary in order to express the opinion set
forth below. In our examination we have assumed the genuineness of all
signatures and the authenticity of all documents submitted to us as originals
and the conformity of all originals of all documents submitted to us as copies.
As to questions of fact material to such opinion, we have relied upon statements
and representations of the Company.

         Our opinion is based on existing law which is subject to change either
prospectively or retroactively. Relevant laws could change in a manner that
could adversely affect the Company or its stockholders. We have no obligation to
inform the Company of any such change in the law. We have not been requested to
opine, and we have not opined, as to any issues other than those expressly set
forth herein. This opinion extends only to questions relating to the validity of
the Shares offered and sold under the Registration Statement. We express no
opinion with respect to any other issue.

         We are admitted to practice law in the State of California and our
opinion is limited to federal law and the laws of the State of Maryland that
affect such opinion. We express no opinion with respect to any other law or the
laws of any other jurisdiction.


<PAGE>   2
Thornburg Mortgage Asset Corporation
September 22, 1997
Page 2

         Assuming the Shares are issued and paid for in accordance with the
terms of the offering described in the Registration Statement, including
documents incorporated by reference thereto, and when certificates representing
such Shares have been issued to the purchasers, based on the foregoing, we are
of the opinion that the Shares will have been duly authorized, validly issued,
and will be fully paid and nonassessable shares of Common Stock of the Company.

         Our Opinion contained herein is solely for the benefit of the Company
and may be relied upon by the Company only in connection with the Registration
Statement. In this regard, we hereby consent to the filing of this opinion,
including this consent, as an exhibit to the Registration Statement.

                                          Very truly yours,

                                          /s/ JEFFERS, WILSON, SHAFF & FALK, LLP
                                          --------------------------------------
                                              Jeffers, Wilson, Shaff & Falk, LLP


<PAGE>   1
                                                                    EXHIBIT 20.1

                               THORNBURG MORTGAGE
                                ASSET CORPORATION
                              119 East Marcy Street
                           Santa Fe, New Mexico 87501
                                  505-989-1900


                            ADMINISTRATOR OF THE PLAN
                   CONTINENTAL STOCK TRANSFER & TRUST COMPANY
                                   2 Broadway
                               New York, NY 10004


                              SHAREHOLDER RELATIONS
                               THORNBURG MORTGAGE
                                ASSET CORPORATION
                              119 East Marcy Street
                           Santa Fe, New Mexico 87501
                                  505-989-1900



<PAGE>   2

                               THORNBURG MORTGAGE
                                ASSET CORPORATION


Dear Shareholder:

         We appreciate your interest in Thornburg Mortgage Asset Corporation
("TMA"), a real estate investment trust that invests primarily in
adjustable-rate mortgage assets. At this time we want to provide you with
additional information regarding TMA's Dividend Reinvestment and Stock Purchase
Plan Amended as of September 17, 1997 (the "Plan").

         The Plan provides a convenient and economical way for both common and
preferred shareholders to automatically reinvest their dividends and to make
common stock purchases, in amount ranging between $100 and $5,000 per month, at
a discount rate ranging from 0% to 5% to the then current market price. It also
provides interested non-shareholders a way to make their initial cash purchases
in an amount ranging from $500 to $5,000 at the same Discount Rate. Please
review the accompanying Prospectus for a detailed explanation of the terms and
conditions of the Plan.

         We believe the Plan has some important advantages to both you as an
investor and to the Company as a whole. The following are a few highlights that
you should be aware of:

o        When you elect to reinvest your dividends and new shares are issued by
         TMA, your dividends will be reinvested into new common shares at a
         discount to the then current market price. The current Discount Rate is
         3%;

o        When common shares are purchased in the market, dividends will be
         reinvested in such shares without incurring brokerage commissions or
         other expenses;

o        A common or preferred shareholder can designate the dividends on a
         portion of his or her shares to be reinvested in common shares and
         continue to receive cash dividends on the remaining portion;

o        If a participant's shares are held in a tax deferred plan, then the tax
         on the dividends may also be deferred;

o        Shareholders can also make additional purchases of TMA common stock on
         a monthly basis, subject to a minimum purchase limit of $100 and a
         maximum purchase limit of $5,000, at up to a 5% discount to the then
         current market price (larger purchases are possible subject to the
         Company's approval);


<PAGE>   3
o        Non-Shareholders may become Participants by making their initial cash
         investment in the Company, subject to a minimum purchase limit of $500
         and a maximum purchase limit of $5,000, at up to a 5% discount to the
         then current market price (larger purchases are possible subject to the
         Company's approval);

o        Participation by shareholders increases the equity capital base of TMA
         which contributes to its continued growth.

         The following are a few answers to commonly asked questions regarding
the Plan. Please read the accompanying Prospectus carefully before deciding to
participate. Each shareholder currently participating in the Plan will continue
to participate without any further action required on his or her part.

WHAT IS THE PURPOSE OF THE DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN?

         The purpose of the Plan is to provide common and preferred shareholders
with a convenient and economical method to both automatically reinvest their
cash dividends in shares of TMA's common stock. It also provides current
shareholders and interested new investors with a way to purchase common shares
directly from the Company at a discount. The Plan is intended to benefit long
term investors who want to increase their investment in the common stock of the
Company.

WHO IS THE PLAN'S ADMINISTRATOR?

         The Plan is being administered by Continental Stock Transfer & Trust
Company (the "Plan Administrator"). The Plan Administrator keeps records, sends
statements of account to each participant in the Plan and performs other duties
related to the Plan, including the safekeeping of the shares purchased for each
participant. The Plan Administrator also acts as the dividend disbursing agent,
transfer agent and registrar for the common stock of TMA.

WHAT INVESTMENT OPTIONS ARE AVAILABLE?

         The attached Authorization Form provides for the purchase of shares of
TMA common stock through the following investment options:

         (1) FULL DIVIDEND REINVESTMENT - the Plan Administrator will apply all
cash dividends paid on all common and/or preferred shares registered in your
name(s), together with any option cash purchases, toward the purchase of shares
of TMA's common stock.

         (2) PARTIAL DIVIDEND REINVESTMENT - the Plan Administrator will apply
all cash dividends pain on only the number of participating common and/or
preferred shares you specify on the authorization form, together with any
optional cash purchases, toward the purchase of shares of TMA's common stock.
Common stock purchased by the Plan will be automatically enrolled in the Plan
such that the dividends paid on such shares will also be reinvested in shares of
TMA's common stock.


                                      -2-

<PAGE>   4
         (3) CASH PURCHASES ONLY - the Plan Administrator will apply voluntary
cash contributions received from you towards the purchase of shares to TMA's
common stock. The optional cash purchases are subject to a minimum purchase
limit of $100.00 (except initial cash purchases by non-shareholders, which are
subject to a minimum purchase limit of $500) and a maximum purchase limit of
$5,000 for each month. You will continue to receive cash dividends on common
and/or preferred shares registered in you name(s). Dividends paid on common
stock purchased by the Plan will be automatically reinvested in shares of the
TMA's common stock.

CAN I CHANGE MY INVESTMENT OPTIONS?

         Yes. Participants may change their investment options at any time by
requesting an authorization form and returning it to the Plan Administrator.

HOW ARE THE SHARES PURCHASED FOR THE PLAN?

         TMA will pay the Plan Administrator all dividends for shares of common
and/or preferred stock owned by participants in the Plan. At the direction of
TMA, the Plan Administrator will then apply such funds, together with any
voluntary cash contributions received from Participants, towards the purchase of
TMA's common stock, either directly from TMA or on the open market. The price of
the shares purchased by the Plan Administrator directly from TMA will be
discounted by up to five percent (5%) from the then current market price.

IS THERE A COST TO PARTICIPATE IN THE PLAN?

         TMA pays all costs relating to the administration and maintenance of
the Plan. There will be no brokerage commission on shares purchased from TMA.
For shares purchased on the open market, TMA will pay any brokerage commissions
or charges up to five percent (5%) and any excess above five percent (5%) will
be paid by the participants on a pro rata basis.

HOW DO I ENROLL?

         Anyone is eligible. Simply complete the attached Authorization Form and
mail it to the Plan Administrator. Shareholders previously enrolled in the Plan
will continue to participate without any further action on their part.

         If your common and/or preferred shares are registered in a name other
than your own e.g., in the name of a broker or bank nominee then you must
either;

               (1) have your shares re-registered in your own name(s) and then
         complete the Authorization Form, or

               (2) request that your broker or nominee complete and sign the
         Authorization Form and a Broker Nominee form and return them to the
         Plan Administrator.

         Shareholders whose shares are registered in the name of the broker or
nominee must verify


                                      -3-

<PAGE>   5
for themselves the extent to which their broker or nominee is able to provide
the services and features of the Plan directly to them. All communications
regarding the Plan by these shareholders must be made directly to their broker
or nominee. See the section entitled "Participation" in the accompanying
Prospectus for further details.

HOW DO I GET MORE INFORMATION?

         Questions regarding the Dividend Reinvestment and Stock Purchase Plan
should be directed to:

                   CONTINENTAL STOCK TRANSFER & TRUST COMPANY
                                   2 Broadway
                               New York, NY 10004
                                 (212) 509-4000

         If your shares are not held in your name, contact your brokerage firm,
bank, or other nominee for more information. They can contact the Plan
Administrator directly for instructions on how to participate on your behalf.

         Questions regarding Thornburg Mortgage Asset Corporation should be
directed to:

                      THORNBURG MORTGAGE ASSET CORPORATION
                              119 East March Street
                           Santa Fe, New Mexico 87501
                                  505-989-1900

         Thank you for taking a few moments to carefully consider the advantages
of enrolling in this Plan.

                                                     Sincerely,

                                                     /s/ LARRY A. GOLDSTONE
                                                     ---------------------------
                                                     Larry A. Goldstone
                                                     President


                                      -4-


<PAGE>   1
                                                                    EXHIBIT 20.3

           THORNBURG MORTGAGE ASSET CORPORATION DIVIDEND REINVESTMENT
                   AND STOCK PURCHASE PLAN AUTHORIZATION FORM

The undersigned holder(s) of common and/or preferred stock of Thornburg Mortgage
Asset Corporation ("TMA") or non-shareholder(s) interested in investing in
Common Stock of TMA elect to participate in the Dividend Reinvestment and Stock
Purchase Plan (the "Plan"). The undersigned hereby authorizes Continental Stock
Transfer & Trust Company ("Plan Agent") to reinvest dividends and distributions
paid by TMA on its common and/or preferred stock now or hereafter registered in
the name(s) of the undersigned, for the number of shares set forth below, and to
make cash purchases in common stock of TMA with funds received from the
undersigned. This authorization shall remain in effect until termination by the
undersigned holder(s) by written notice to the Plan Agent.

The foregoing authorization is subject, in all respects to the terms and
conditions of participation in the Plan set forth in the Prospectus relating to
the Plan, which the undersigned has received and read.

PLEASE SIGN EXACTLY AS YOUR SHARES ARE REGISTERED OR IF AN INITIAL CASH PURCHASE
BY A NON-SHAREHOLDER, AS YOU WOULD LIKE THE SHARES REGISTERED. ALL PERSONS WHOSE
NAMES APPEAR ON THE STOCK CERTIFICATES MUST SIGN.

Identification of the types of shares:  [ ] Common Stock    [ ] Preferred Stock
                                        [ ] Both

         Please indicate your participation below:

              [ ] Full dividend reinvestment on all shares.
              [ ] Partial dividend reinvestment on ______ common shares only.
              [ ] Partial dividend reinvestment on ______ preferred shares only.
              [ ] Cash purchases only.


- --------------------------------------------------------------------------------
                           Please Print Your Address


- --------------------------------------------------------------------------------
                         Please Print Your Phone Number


- --------------------------------------------------------------------------------
               Please Print Name(s) as Shown on Stock Certificate


- --------------------------------------------------------------------------------
                              Shareholder Signature


- --------------------------------------------------------------------------------
                           Joint Shareholder Signature


- --------------------------------------------------------------------------------
Date                               Social Security or Tax Identification number


         IF YOUR SHARES ARE HELD IN THE NAME OF A BROKER OR NOMINEE, YOU MUST
MAKE APPROPRIATE ARRANGEMENTS WITH THEM TO PARTICIPATE IN THE PLAN. PLEASE SEE
INSTRUCTIONS IN THE PROSPECTUS.




<PAGE>   1
                                                                    EXHIBIT 23.2

                     [Letterhead of McGladrey & Pullen, LLP]

               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS



        We consent to the incorporation by reference in this Registration
Statement of Thornburg Mortgage Asset Corporation (the "Company") on Form S-3D
of our report, dated January 14, 1997 accompanying the financial statements of
the Company appearing in its 1996 Annual Report on Form 10-K.


                                                    /s/ MCGLADREY & PULLEN, LLP
                                                    ----------------------------
                                                        McGladrey & Pullen, LLP


New York, New York
September 19, 1997




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