EXHIBIT 3.4

MFA MORTGAGE INVESTMENTS, INC.

Articles Supplementary

Series A Cumulative Redeemable

Preferred Stock

     MFA Mortgage Investments, Inc., a Maryland corporation (the “Corporation”), hereby certifies to the State Department of Assessments and Taxation of Maryland that:

     FIRST: Under a power contained in Article SIXTH of the Corporation’s Articles of Amendment and Restatement (the “Charter”), the Board of Directors by duly adopted resolutions reclassified 5,000,000 shares of authorized but unissued Common Stock, as authorized but unissued Preferred Stock and classified and designated 5,000,000 shares of authorized but unissued Preferred Stock as shares of 8.50% Series A Cumulative Redeemable Preferred Stock, with the following preferences, conversion and other rights, voting powers, restrictions, limitations as to dividends and other distributions, qualifications, and terms and conditions of redemption, which, upon any restatement of the Charter, shall become part of Article SIXTH of the Charter, with any necessary or appropriate renumbering or relettering of the sections or subsections hereof.

Series A Preferred Stock

          (1) DESIGNATION AND NUMBER. A series of preferred stock, designated the “8.50% Series A Cumulative Redeemable Preferred Stock” (the “Series A Preferred Stock”), is hereby established. The number of shares of the Series A Preferred Stock shall be 5,000,000.

          (2) RANK. The Series A Preferred Stock shall, with respect to the payment of distributions and the distribution of assets upon liquidation, dissolution or winding up of the Corporation, rank (a) senior to all classes or series of Common Stock and to all equity securities of the Corporation, the terms of which specifically provide that such equity securities rank junior to such Series A Preferred Stock; (b) on a parity with all equity securities issued by the Corporation the terms of which specifically provide that such equity securities rank on a parity with the Series A Preferred Stock; and (c) junior to all equity securities issued by the Corporation the terms of which specifically provide that such equity securities rank senior to the Series A Preferred Stock. The term “equity securities” shall not include convertible debt securities.

          (3) DIVIDENDS.

               (a) Holders of the then outstanding shares of Series A Preferred Stock shall be entitled to receive, when and as authorized by the Board of Directors, out of funds legally available for the payment of dividends, cumulative preferential cash dividends at the rate of 8.50% of the $25.00 liquidation preference per annum (equivalent to a fixed annual amount of $2.125 per share). Such dividends shall be cumulative from the first date on which any Series A Preferred Stock is issued (the “Original Issue Date”) and shall be payable quarterly in arrears on or before March 31, June 30, September 30 and December 31 of each year or, if not a business day, the next succeeding business day (each, a “Dividend Payment Date”). Any dividend payable on the Series A Preferred Stock for any partial dividend period will be computed on the basis of a 360-day year consisting of twelve 30-day months (it being understood that the dividend payable on June 30, 2004 will be for less than the full dividend period). Dividends will be payable to holders of record as they appear in the stock records of the Corporation at the close of business on the applicable record date, which shall be the first day of the calendar month on which the applicable

Dividend Payment Date falls or on such other date designated by the Board of Directors of the Corporation for the payment of dividends that is not more than 30 nor less than 10 days prior to such Dividend Payment Date (each, a “Dividend Record Date”).

               (b) No dividends on shares of Series A Preferred Stock shall be declared by the Corporation or paid or set apart for payment by the Corporation at such time as the terms and provisions of any agreement of the Corporation, including any agreement relating to its indebtedness, prohibit such declaration, payment or setting apart for payment or provide that such declaration, payment or setting apart for payment would constitute a breach thereof or a default thereunder, or if such declaration or payment shall be restricted or prohibited by law.

               (c) Notwithstanding the foregoing, dividends on the Series A Preferred Stock shall accrue whether or not the terms and provisions set forth in Section 3(b) hereof at any time prohibit the current payment of dividends, whether or not the Corporation has earnings, whether or not there are funds legally available for the payment of such dividends and whether or not such dividends are declared. Accrued but unpaid dividends on the Series A Preferred Stock will accumulate as of the Dividend Payment Date on which they first become payable.

               (d) Except as provided in Section 3(e) below, unless full cumulative dividends on the Series A Preferred Stock have been or contemporaneously are declared and paid or declared and a sum sufficient for the payment thereof is set apart for payment for all past dividend periods and the then current dividend period, no dividends (other than in shares of Common Stock or in shares of any series of Preferred Stock ranking junior to the Series A Preferred Stock as to the payment of distributions and the distribution of assets upon liquidation) shall be declared or paid or set aside for payment nor shall any other distribution be declared or made upon the Common Stock, or any Preferred Stock of the Corporation ranking junior to or on a parity with the Series A Preferred Stock as to the payment of distributions and the distribution of assets upon liquidation, nor shall any shares of Common Stock or any shares of Preferred Stock of the Corporation ranking junior to or on a parity with the Series A Preferred Stock as to the payment of distributions and the distribution of assets upon liquidation be redeemed, purchased or otherwise acquired for any consideration (or any moneys be paid to or made available for a sinking fund for the redemption of any such shares) by the Corporation (except by conversion into or in exchange for other capital stock of the Corporation ranking junior to the Series A Preferred Stock as to the payment of distributions and the distribution of assets upon liquidation and except for transfers made pursuant to the provisions of Article NINTH of the Charter).

               (e) When dividends are not paid in full (or a sum sufficient for such full payment is not so set apart) on the Series A Preferred Stock and the shares of any other series of Preferred Stock ranking on a parity as to dividends with the Series A Preferred Stock, all dividends declared upon the Series A Preferred Stock and any series of Preferred Stock ranking on a parity as to dividends with the Series A Preferred Stock shall be declared pro rata so that the amount of dividends declared per share of Series A Preferred Stock and such series of Preferred Stock shall in all cases bear to each other the same ratio that accrued dividends per share on the Series A Preferred Stock and such series of Preferred Stock (which shall not include any accrual in respect of unpaid dividends for prior dividend periods if such Preferred Stock does not have a cumulative dividend) bear to each other. No interest, or sum of money in lieu of interest, shall be payable in respect of any dividend payment or payments on Series A Preferred Stock which may be in arrears.

               (f) Any dividend payment made on shares of the Series A Preferred Stock shall first be credited against the earliest accrued but unpaid dividend due with respect to such shares which remains payable. Holders of the Series A Preferred Stock shall not be entitled to any dividend, whether payable in cash, property or stock in excess of full cumulative dividends on the Series A Preferred Stock as described above.

          (4) LIQUIDATION PREFERENCE.

               (a) Upon any voluntary or involuntary liquidation, dissolution or winding up of the affairs of the Corporation, the holders of shares of Series A Preferred Stock then outstanding are entitled to be paid out of the assets of the Corporation, legally available for distribution to its stockholders, a liquidation preference of $25.00 per share, plus an amount equal to any accrued and unpaid dividends (whether or not declared) to the date of payment, before any distribution of assets is made to holders of Common Stock or any series of Preferred Stock of the Corporation that ranks junior to the Series A Preferred Stock as to liquidation rights.

               (b) In the event that, upon any such voluntary or involuntary liquidation, dissolution or winding up, the available assets of the Corporation are insufficient to pay the amount of the liquidating distributions on all outstanding shares of Series A Preferred Stock and the corresponding amounts payable on all shares of other classes or series of capital stock of the Corporation ranking on a parity with the Series A Preferred Stock in the distribution of assets, then the holders of the Series A Preferred Stock and all other such classes or series of capital stock shall share ratably in any such distribution of assets in proportion to the full liquidating distributions to which they would otherwise be respectively entitled.

               (c) After payment of the full amount of the liquidating distributions to which they are entitled, the holders of Series A Preferred Stock will have no right or claim to any of the remaining assets of the Corporation.

               (d) Written notice of any such liquidation, dissolution or winding up of the Corporation, stating the payment date or dates when, and the place or places where, the amounts distributable in such circumstances shall be payable, shall be given by first class mail, postage pre-paid, not less than 30 nor more than 60 days prior to the payment date stated therein, to each record holder of the Series A Preferred Stock at the respective addresses of such holders as the same shall appear on the stock transfer records of the Corporation.

               (e) The consolidation or merger of the Corporation with or into any other corporation, trust or entity or of any other corporation with or into the Corporation, or the sale, lease or conveyance of all or substantially all of the assets or business of the Corporation, shall not be deemed to constitute a liquidation, dissolution or winding up of the Corporation.

          (5) REDEMPTION.

               (a) Right of Optional Redemption. The Series A Preferred Stock is not redeemable prior to the fifth anniversary of the issuance of the Series A Preferred Stock, has no stated maturity and will not be subject to any sinking fund or mandatory redemption. However, in order to ensure that the Corporation continues to qualify as a real estate investment trust (“REIT”) for federal income tax purposes, the Series A Preferred Stock will be subject to the provisions of Article NINTH of the Charter. Pursuant to Article NINTH, and without limitation of any provisions of such Article NINTH, Series A Preferred Stock, together with other equity stock of the Corporation, owned by a stockholder in excess of the Ownership Limit will automatically be transferred to a Trust for the benefit of one or more Charitable Beneficiaries. On and after the fifth anniversary of the issuance of the Series A Preferred Stock, the Corporation, at its option and upon not less than 30 nor more than 60 days’ written notice, may redeem shares of the Series A Preferred Stock, in whole or in part, at any time or from time to time, for cash at a redemption price of $25.00 per share, plus all accrued and unpaid dividends thereon to and including the date fixed for redemption (except as provided in Section 5(c) below), without interest. If less than all of the outstanding Series A Preferred Stock is to be redeemed, the Series A Preferred Stock to be redeemed shall be selected pro rata (as nearly as may be practicable without creating fractional shares) or by any other equitable method determined by the Corporation.

               (b) Limitations on Redemption. Unless full cumulative dividends on all shares of Series A Preferred Stock shall have been, or contemporaneously are, declared and paid or declared and a sum sufficient for the payment thereof set apart for payment for all past dividend periods and the then current dividend period, no shares of Series A Preferred Stock shall be redeemed unless all outstanding shares of Series A Preferred Stock are simultaneously redeemed, and the Corporation shall not purchase or otherwise acquire directly or indirectly any shares of Series A Preferred Stock (except by exchange for capital stock of the Corporation ranking junior to the Series A Preferred Stock as to the payment of distributions and the distribution of assets upon liquidation); provided, however, that the foregoing shall not prevent such action by the Board of Directors or its designees pursuant to Article NINTH in order to ensure that the Corporation remains qualified as a REIT for federal income tax purposes or the purchase or acquisition of shares of Series A Preferred Stock pursuant to a purchase or exchange offer made on the same terms to holders of all outstanding shares of Series A Preferred Stock.

               (c) Rights to Dividends on Shares Called for Redemption. Immediately prior to any redemption of Series A Preferred Stock, the Corporation shall pay, in cash, any accumulated and unpaid dividends to and including the redemption date, unless a redemption date falls after a Dividend Record Date and prior to the corresponding Dividend Payment Date, in which case each holder of Series A Preferred Stock at the close of business on such Dividend Record Date shall be entitled to the dividend payable on such shares on the corresponding Dividend Payment Date notwithstanding the redemption of such shares before such Dividend Payment Date. Except as provided above, the Corporation will make no payment or allowance for unpaid dividends, whether or not in arrears, on Series A Preferred Stock which is redeemed.

               (d) Procedures for Redemption.

     (i) Notice of redemption will be mailed by the Corporation, postage prepaid, not less than 30 nor more than 60 days prior to the redemption date, addressed to the respective holders of record of the Series A Preferred Stock to be redeemed at their respective addresses as they appear on the stock transfer records of the Corporation. No failure to give such notice or any defect thereto or in the mailing thereof shall affect the validity of the proceedings for the redemption of any shares of Series A Preferred Stock except as to the holder to whom notice was defective or not given.

     (ii) In addition to any information required by law or by the applicable rules of any exchange upon which Series A Preferred Stock may be listed or admitted to trading, such notice shall state: (A) the redemption date; (B) the redemption price; (C) the number of shares of Series A Preferred Stock to be redeemed; (D) the place or places where the Series A Preferred Stock is to be surrendered for payment of the redemption price; and (E) that dividends on the shares to be redeemed will cease to accrue on such redemption date. If less than all of the Series A Preferred Stock held by any holder is to be redeemed, the notice mailed to such holder shall also specify the number of shares of Series A Preferred Stock held by such holder to be redeemed.

     (iii) If notice of redemption of any shares of Series A Preferred Stock has been given and if the funds necessary for such redemption have been set aside by the Corporation in trust for the benefit of the holders of any shares of Series A Preferred Stock so called for redemption, then, from and after the redemption date, dividends will cease to accrue on such shares of Series A Preferred Stock, such shares of Series A Preferred Stock shall no longer be deemed outstanding and all rights of the holders of such shares will terminate, except the right to receive the redemption price. Holders of Series A Preferred Stock to be redeemed shall surrender such Series A Preferred Stock at the place designated in such notice and, upon surrender in accordance with said notice of the certificates for shares of Series A Preferred Stock so redeemed (properly endorsed or assigned for transfer, if the Corporation shall so require and the notice shall

so state), such shares of Series A Preferred Stock shall be redeemed by the Corporation at the redemption price plus any accrued and unpaid dividends payable upon such redemption. In case less than all the shares of Series A Preferred Stock represented by any such certificate are redeemed, a new certificate or certificates shall be issued representing the unredeemed shares of Series A Preferred Stock without cost to the holder thereof.

     (iv) The deposit of funds with a bank or trust corporation for the purpose of redeeming Series A Preferred Stock shall be irrevocable except that:

     (A) the Corporation shall be entitled to receive from such bank or trust corporation the interest or other earnings, if any, earned on any money so deposited in trust, and the holders of any shares redeemed shall have no claim to such interest or other earnings; and

     (B) any balance of monies so deposited by the Corporation and unclaimed by the holders of the Series A Preferred Stock entitled thereto at the expiration of two years from the applicable redemption dates shall be repaid, together with any interest or other earnings thereon, to the Corporation, and after any such repayment, the holders of the shares entitled to the funds so repaid to the Corporation shall look only to the Corporation for payment without interest or other earnings.

               (e) Application of Article NINTH. The shares of Series A Preferred Stock are subject to the provisions of Article NINTH of the Charter, including, without limitation, the provision for the redemption of shares transferred to the Trustee as trustee of a Trust for the exclusive benefit of one or more Charitable Beneficiaries. For purposes of Section (j)(5) of Article NINTH, the Market Price of the Series A Preferred Stock shall equal $25.00 per share, plus all accrued and unpaid dividends on the shares of Series A Preferred Stock.

               (f) Status of Redeemed Shares. Any shares of Series A Preferred Stock that shall at any time have been redeemed or otherwise acquired by the Corporation shall, after such redemption or acquisition, have the status of authorized but unissued Preferred Stock, without designation as to series until such shares are once more classified and designated as part of a particular series by the Board of Directors.

          (6) VOTING RIGHTS.

               (a) Holders of the Series A Preferred Stock will not have any voting rights, except as set forth below.

               (b) Whenever dividends on any shares of Series A Preferred Stock or any series of preferred stock ranking on parity as to the payment of dividends with the Series A Preferred Stock shall be in arrears for six or more quarterly periods, whether or not consecutive (a “Preferred Dividend Default”), the holders of such shares of Series A Preferred Stock (voting separately as a class with all other series of preferred stock ranking on a parity with the Series A Preferred Stock as to the payment of distributions and the distribution of assets upon liquidation (“Parity Preferred”) upon which like voting rights have been conferred and are exercisable) will be entitled to vote for the election of a total of two additional directors of the Corporation (the “Preferred Stock Directors”), and the number of directors on the Board of Directors shall increase by two, at a special meeting called by the holders of record of at least 20% of the Series A Preferred Stock or the holders of any other series of Parity Preferred so in arrears (unless such request is received less than 90 days before the date fixed for the next annual or special meeting of stockholders in which event such meeting shall be held at the next annual meeting of stockholders), and at each subsequent annual meeting until all dividends accumulated on such shares of Series A Preferred Stock and any series of preferred stock ranking on a parity as to the payment of

dividends with the Series A Preferred Stock for the past dividend periods and the dividend for the then current dividend period shall have been fully paid or declared and a sum sufficient for the payment thereof set aside for payment.

               (c) If and when all accumulated dividends and the dividend for the then current dividend period on the Series A Preferred Stock and any series of preferred stock ranking on a parity as to the payment of dividends with the Series A Preferred Stock shall have been paid in full or set aside for payment in full, the holders of shares of Series A Preferred Stock shall be divested of the voting rights set forth in Section 6(b) hereof (subject to revesting in the event of each and every subsequent Preferred Dividend Default) and, if all accumulated dividends and the dividend for the current dividend period have been paid in full or set aside for payment in full on all other series of Parity Preferred upon which like voting rights have been conferred and are exercisable, the term of office of each Preferred Stock Director so elected shall terminate and the number of directors on the Board of Directors shall decrease by two. Any Preferred Stock Director may be removed at any time with or without cause by the vote of, and shall not be removed otherwise than by the vote of, the holders of record of a majority of the outstanding shares of the Series A Preferred Stock when they have the voting rights set forth in Section 6(b) (voting separately as a class with the Parity Preferred, upon which like voting rights have been conferred and are exercisable). So long as a Preferred Dividend Default shall continue, any vacancy in the office of a Preferred Stock Director may be filled by written consent of the Preferred Stock Director remaining in office or, if none remains in office, by a vote of the holders of record of a majority of the outstanding shares of Series A Preferred Stock when they have the voting rights set forth in Section 6(b) (voting separately as a class with all other series of Parity Preferred, upon which like voting rights have been conferred and are exercisable). The Preferred Stock Directors shall each be entitled to one vote per director on any matter.

               (d) So long as any shares of Series A Preferred Stock remain outstanding, the Corporation shall not, without the affirmative vote of the holders of at least two-thirds of the shares of the Series A Preferred Stock outstanding at the time, given in person or by proxy, either in writing or at a meeting (voting separately as a class, together with all other series of Parity Preferred upon which like voting rights have been conferred and are exercisable), (i) authorize or create, or increase the authorized or issued amount of, any class or series of capital stock ranking prior to the Series A Preferred Stock with respect to the payment of distributions and the distribution of assets upon liquidation, dissolution or winding up, or reclassify any authorized capital stock of the Corporation into any such shares, or create, authorize or issue any obligation or security convertible into or evidencing the right to purchase any such shares or (ii) amend, alter or repeal the provisions of the Charter, whether by merger, consolidation or otherwise, so as to materially and adversely affect any right, preference, privilege or voting power of the Series A Preferred Stock or the holders thereof; provided, however, that with respect to the occurrence of any event set forth in (ii) above, so long as the Series A Preferred Stock remains outstanding with the terms thereof materially unchanged, the occurrence of any such event shall not be deemed to materially and adversely affect such rights, preferences, privileges or voting powers of the Series A Preferred Stock and; provided, further, that any increase in the amount of the authorized Preferred Stock or the creation or issuance of any other series of Preferred Stock, or any increase in the amount of authorized shares of such series, in each case ranking on a parity with or junior to the Series A Preferred Stock with respect to the payment of distributions and the distribution of assets upon liquidation, dissolution or winding up, shall not be deemed to materially and adversely affect such rights, preferences, privileges or voting powers.

               (e) The foregoing voting provisions will not apply if, at or prior to the time when the act with respect to which such vote would otherwise be required shall be effected, all outstanding shares of Series A Preferred Stock shall have been redeemed or called for redemption upon proper notice and sufficient funds shall have been deposited in trust to effect such redemption.

          (7) CONVERSION. The Series A Preferred Stock is not convertible into or exchangeable for any property or securities of the Corporation.

     SECOND: The 5,000,000 shares of Common Stock have been reclassified as 5,000,000 shares of Series A Preferred Stock and 5,000,000 shares of Series A Preferred Stock have been classified and designated by the Board of Directors under the authority contained in the Charter.

     THIRD: These Articles Supplementary have been approved by the Board of Directors in the manner and by the vote required by law.

     FOURTH: The undersigned Chief Executive Officer and President of the Corporation acknowledges these Articles Supplementary to be the corporate act of the Corporation and, as to all matters or facts required to be verified under oath, the undersigned Chief Executive Officer and President acknowledges that, to the best of his knowledge, information and belief, these matters and facts are true in all material respects and that this statement is made under the penalties of perjury.

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IN WITNESS WHEREOF, the Corporation has caused these Articles Supplementary to be signed in its name and on its behalf by its Chief Executive Officer and President and attested to by its General Counsel, Senior Vice President-Business Development and Secretary on this 22nd day of April, 2004.