Document:

EXHIBIT 4.2

                      PPLUS TRUST CERTIFICATES SERIES SPR-1

                         AMENDMENT TO SERIES SUPPLEMENT

                                     between

                         MERRILL LYNCH DEPOSITOR, INC.,

                                  as Depositor,

                                       and

                              THE BANK OF NEW YORK,

                     as Trustee and Securities Intermediary

                          Dated as of December 12, 2003

<PAGE>

               AMENDMENT TO SERIES SUPPLEMENT, dated as of December 12, 2003
(the "Amendment"), by and between MERRILL LYNCH DEPOSITOR INC., a Delaware
corporation, as Depositor, THE BANK OF NEW YORK, a New York corporation, as
Trustee and Securities Intermediary.

                                   WITNESSETH:

               REFERENCE is made to the PPLUS Trust Series SPR-1 (the "Trust")
created by the Depositor by executing and delivering the Series Supplement dated
as of November 28, 2003 (the "Series Supplement"), which incorporates the terms
of the Standard Terms for Trust Agreements, dated as of February 20, 1998 (the
"Standard Terms" and, together with such Series Supplement, the "Trust
Agreement"), by and between the Depositor and the Trustee and Securities
Intermediary, as modified by such Series Supplement;

               WHEREAS, Section 3(b) of the Series Supplement permits the
Depositor to increase the amount of the Underlying Securities in the Trust and
the Trust to issue a corresponding number of additional Warrants subject to the
terms and conditions set forth in Section 3(b); and

               WHEREAS, the Depositor, on November 28, 2003, deposited
$25,475,000 Underlying Securities into the Trust and now desires to increase the
number of Underlying Securities in the Trust from $25,475,000 to $43,297,000
and, therefore, increase the number of Trust Certificates issued by the Trust
and the corresponding number of Warrants from 1,000,600 to 1,700,600;

               NOW, THEREFORE, in consideration of the foregoing premises, it is
hereby agreed by and between the Depositor and the Trustee and Securities
Intermediary as follows:

Section 1.     Amendment of Series Supplement.

               The Series Supplement is hereby amended as follows:

               (a)  All references to "1,000,600" shall be replaced with
                    "1,700,600"; and

               (b)  All references to "$25,475,000" shall be replaced with
                    "$43,297,000".

               (c)  The following definition shall be added to Section 2 of the
                    Series Supplement:

                    "Warrant" shall mean a Warrant Certificate as such term is
                    defined in the Warrant Agreement.

               (d)  The introductory clause of Section 4 of the Series
                    Supplement shall be amended to read:

                    "The Trustee hereby acknowledges receipt, with respect to
                    $25,475,000 of Underlying Securities, on or prior to the
                    Closing Date, and with respect to $17,822,000 of Underlying
                    Securities, on or prior to December 12, 2003, of:"

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Section 2.     Additional Warrant Certificates. Simultaneously with the
execution hereof, the Depositor directs the Trustee, in the name and on behalf
of the Trust, to enter into additional Warrant Certificates (as defined in the
Warrant Agreement) evidencing the additional Call Rights related to the increase
in the amount of Underlying Securities.

Section 3.     References. All references to the Series Supplement or the Trust
Agreement, in any document executed in connection with the Series Supplement,
shall be deemed to refer to the Series Supplement or the Trust Agreement, as
applicable, as amended by this Amendment.

Section 4.     Miscellaneous.

               (a) Counterparts. This Amendment may be executed by the parties
hereto in separate counterparts, each of which when so executed and delivered
shall be an original, but all such counterparts shall together constitute but
one and the same instrument.

               (b) Amendments. Neither this Amendment nor any of the terms
hereof may be terminated, amended, supplemented, waived or modified orally, but
only by an instrument in writing signed by the party against which the
enforcement of such termination, amendment, supplement, waiver or modification
is sought.

               (c) Governing Law. This Amendment shall in all respects be
construed in accordance with and governed by the laws of the State of New York,

               (d) Benefit and Binding Effect. The terms of this Amendment shall
be binding upon, and shall inure to the benefit of, the parties hereto and their
successors and permitted assigns.

               Except as amended by this Amendment, the Series Supplement
remains in full force and effect.

                                       2
<PAGE>

               IN WITNESS WHEREOF, the parties hereto have caused this Amendment
to be duly executed by their respective authorized officers as of the date first
written above.

                                          Merrill Lynch Depositor, Inc.,
                                          as Depositor

                                          By:  /s/ Barry N. Finkelstein
                                               -------------------------
                                          Name:    Barry N.  Finkelstein
                                          Title:   President

                                          The Bank of New York,
                                          not in its individual capacity
                                          but as Trustee

                                          By:  /s/ Ferdinand Acebedo
                                               -------------------------
                                          Name:    Ferdinand Acebedo
                                          Title:   Authorized Signatory

                                          The Bank of New York,
                                          as Securities Intermediary

                                          By:  /s/ Ferdinand Acebedo
                                               ------------------------
                                          Name:    Ferdinand Acebedo
                                          Title:   Authorized Signatory<PAGE>
                                                                   Exhibit 10.12

                           UNITED NATIONAL GROUP, LTD.

                         ANNUAL INCENTIVE AWARDS PROGRAM

                        (Effective as of January 1, 2003)
<PAGE>
                           UNITED NATIONAL GROUP, LTD.
                         ANNUAL INCENTIVE AWARD PROGRAM

I.  PURPOSE:  The purposes of this Annual Incentive Award Program are:

    1.  To encourage increased efficiency and profitability of United National
        Group, Ltd. (UNGL).

    2.  To reward participants' contributions to corporate success.

II.  COMPENSATION PHILOSOPHY

     United National Group, Ltd. wishes to provide a comprehensive, competitive
compensation program for its officers. This Annual Incentive Award Program is
intended to be an integral part of the total compensation opportunity offered by
the organization to these key employees. This incentive program is an adjunct to
other forms of compensation provided by UNGL.

III. DEFINITION OF TERMS

   For purposes of this program, terms have meanings as follows:

    A.  "Base Salary" means a participant's W-2 wages for a calendar year
        excluding any extraordinary compensation such as bonuses, stock options,
        deferred compensation or benefits which are taxable for federal income
        tax purposes. For purposes of this program base W-2 earnings shall
        include, however, any salary deferrals which represent the employee's
        portion of contributions to a qualified benefit plan or deferred
        compensation plan offered by UNGL and subsidiaries.

    B.  "Beneficiary" or "Beneficiaries" means the person or persons designated
        by the Participant to receive any payments due from this Annual
        Incentive Award Program in the event of the Participant's death. Such a
        designation may, without notice to the beneficiary, be changed or
        revoked by the Participant at any time and from time to time. The
        designation of the Beneficiary, and any change or revocation thereof,
        shall be made in writing and shall not be effective unless and until
        filed with and acknowledged by the Committee.

        If a Participant fails to designate a Beneficiary, or if no designated
        Beneficiary survives the Participant, the amount payable from the Annual
        Incentive Award Program shall be paid to the Participant's Estate.

        If a person designated as a Beneficiary shall be a minor or a person who
        has been judged legally incompetent, UNGL shall make payment on behalf
        of such Beneficiary to the Beneficiary's guardian or conservator, but
        only if such guardian or conservator has provided to the Committee

                                       2
<PAGE>
        documentary evidence satisfactory to it as to the legal, valid and
        continuing authority of such guardian or conservator to act on behalf of
        such Beneficiary. Upon payment to such guardian or conservator, neither
        the Board of Directors, UNGL, the Committee or any other agent, employee
        or officer of any of them shall have any further liability for such
        payment.

    C.  "Committee" means the Compensation Committee of UNGL, as designated from
        time to time by the Board of Directors of UNGL.

    D.  "Annual Incentive Award" means the amount earned by a Participant
        pursuant to the provisions of this Program.

    E.  "Annual Incentive Award Tables" means tables established by the
        Committee for each Plan Year which correlate the performance of UNGL and
        subsidiaries to the percentage of Incentive awards that may be earned.

    F.  "Net Income" means the audited GAAP net income of UNGL for a particular
        Plan Year.

    G.  "Participant" means any officer of UNGL or subsidiary who has been
        designated by the Compensation Committee to participate in this program.

    H.  "Plan Year" means a twelve month consecutive period commencing on each
        January 1 and ending on each December 31.

    I.  "Shareholders" means the shareholders of UNGL.

IV.   DESIGNATION OF PARTICIPANTS

    A.  The Participants in this program shall be those employees of UNGL and
        subsidiaries who are designated by the Committee as being eligible to
        participate in the plan. The following classifications of employees
        shall be considered eligible for consideration by the Committee to
        participate in this program:

        1.  President / Chief Executive Officer

        2.  Senior Vice Presidents

        3.  Vice Presidents

        4.  2nd Vice Presidents and Assistant Vice Presidents

    B.  A Participant may participate only in one plan or program providing for
        annual incentive payments or compensation. Should any individual be a
        participant in another such plan or program, he/she will be excluded
        from receiving any benefit under this program.

                                       3
<PAGE>
    C.  In order to be eligible to be a Participant for any Plan Year, an
        individual must meet the criteria set forth in this program both at the
        beginning and the end of the Plan Year, except in those cases where a
        Participant's employment with UNGL and subsidiaries has terminated due
        to retirement, death or disability. Any deviation from this clause
        requires the prior written approval of the Committee.

    D.  The Board of Directors of UNGL will be the sole determinant as to the
        number of Participants in this plan.

V.   ANNUAL INCENTIVE AWARDS FOR PARTICIPANTS

    A.  BASIS FOR EARNING ANNUAL INCENTIVE AWARDS: Participants will earn an
        Annual Incentive Award as follows:

        Tier I and Tier II Participants:

            -     Part I - Achievement of actual Net Income for the Plan Year
                  versus the budgeted Net Income for the Plan Year.

        Tier III and Tier IV Participants:

            -     Part I - Achievement of actual Net Income for the Plan Year
                  versus the budgeted Net Income for the Plan Year

                                       And

            -     Part II - Evaluation of the Participant's individual
                  contribution to the overall success of UNGL as measured by the
                  achievement of individual performance expectations of the
                  Participant for the Plan Year.

B.    AWARD OPPORTUNITIES:

        Part I - Award opportunities under this program are expressed as a
        percentage of the Participant's Base Salary as defined in section III.

        The award opportunities vary for each Participant depending on the tier
        to which the Participant is assigned. These tiers and their respective
        award opportunities are as follows:

<TABLE>
<CAPTION>
            Participant's     Annual Award Opportunities  (Part 1)
                              ------------------------------------
            Category          Threshold   Target            Maximum
            --------          ---------   ------            -------

<S>                           <C>         <C>               <C>
            Tier I                  20%         50%         75%
            Tier II                 15%         40%         60%
            Tier III                10%         25%         45%
            Tier IV                 5%          10%         20%
</TABLE>

                                       4
<PAGE>
      Part II - Award opportunities under this program are expressed as a
      percentage of the Participant's Base Salary as defined in section III.

      The award opportunities vary for each Participant depending on the
      category to which the Participant is assigned. The categories and their
      respective award opportunities are as follows:

<TABLE>
<CAPTION>
            Participant's Category  Annual Award Opportunity  (Part II)
            ----------------------  -----------------------------------
<S>         <C>                     <C>
            Tier I                         N/A
            Tier II                        N/A
            Tier III                       Up to 5%
            Tier IV                        Up to 10%
</TABLE>

C     DETERMINATION OF ANNUAL INCENTIVE AWARDS EARNED:

      Part I - The Compensation Committee will establish the budgeted Net Income
      for the Plan Year that needs to be achieved in order for the Participant
      to receive awards at various levels of performance. The performance
      achievement is equal to actual Net Income for the Plan Year divided by the
      budgeted Net Income for the Plan Year ("Performance Achievement"). The
      following levels of Performance Achievement will be utilized as a basis
      when determining the award for each Participant:

-   Threshold - The Participant will achieve the Threshold award if Performance
    Achievement is equal to .90.

-   Target - The Participant will achieve the Target award if Performance
    Achievement is equal to 1.00.

-   Maximum - The Participant will achieve the Maximum award if Performance
    Achievement is equal to or greater than 1.20.

      If Performance Achievement falls in-between the Threshold/Target/Maximum
      levels, the Annual Incentive Award will be determined using the following
      regression formulas, where appropriate:

<TABLE>
<CAPTION>
         Category        Achievement to 100%        Achievement Above 100%
         --------        -------------------        ----------------------

<S>                <C>   <C>                         <C>
-     Tier I       -     300 (x) - 250 = Award %     125(x) - 75= Award %
-     Tier II      -     250 (x) - 210 = Award %     100(x) - 60 = Award %
-     Tier III     -     150 (x) - 125 = Award %     100(x) - 75 = Award %
-     Tier IV      -      50 (x) -  40 = Award %      50(x) - 40 = Award %
</TABLE>

      Note: (x) equals the level of Performance Achievement

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<PAGE>
      When using the above formulas, if Performance Achievement is below .9 then
      (x) equals zero and if Performance Achievement is greater than 1.2 then
      (x) equals 1.2.

      Part II - Tier III and Tier IV participants are eligible to earn an
      additional discretionary award of up to 5% and 10%, respectively, of the
      Participant's base salary based on the Participant's achievement of
      individual performance goals for the Plan Year. This discretionary award
      will be determined by the Participant's immediate manager and approved by
      the Committee. No awards under Part II will be earned if Performance
      Achievement is less than .8

VI.   PAYMENT OF ANNUAL INCENTIVE AWARDS.

      A Participant shall be entitled to receive payment in an amount equal to
      his/her Annual Incentive Award no later than thirty days after receipt by
      the Committee of the audited GAAP financial statements of UNGL and
      subsidiaries. Notwithstanding the foregoing, in order to be eligible for
      payment of an Annual Incentive Award amount for any Plan Year, a
      Participant must be employed by UNGL and subsidiaries at the close of the
      Plan Year, except in the case of a Participant whose employment terminates
      on account of retirement, death, or disability. In the case of a
      Participant whose employment has terminated during the Plan Year due to
      retirement, death or disability, that Participant or his/her Beneficiary
      will qualify for a pro-rated portion of the Participant's Annual Incentive
      Award, based on the number of complete calendar months of service which
      the Participant completed during that Plan Year. Any deviation from this
      clause requires the prior authorization of the Committee.

      Any payments due to Particpants' Beneficiaries under this program will be
      paid at the time payment would otherwise have been made to the
      Participant, provided the identity and validity of such Beneficiary has
      been legally established.

        Notwithstanding any other provision of this Plan, (A) if an individual's
        employment with UNGL and subsidiaries is terminated on account of
        conduct detrimental to UNGL's best interests, then the Committee, in its
        sole discretion, may cancel payment of any Annual Incentive Awards that
        have been earned under this program but have not yet been paid (
        Determination of whether or not conduct is detrimental to the best
        interest of UNGL and subsidiaries shall be solely the discretion of the
        Compensation Committee and shall not be subject to challenge by the
        Participant in any manner) and (B) if a Participant resigns for any
        reason prior to the payment of an Annual Incentive Award, the
        Participant shall not be entitled to any payment under the Plan.

                                       6
<PAGE>
VII.  PLAN ADMINISTRATION.

      This plan shall be administered by the Committee. The Committee shall have
      the authority to interpret the plan in its sole and absolute discretion
      based upon the Plan's provisions and to make all other determinations
      necessary or desirable for the Plan's administration; and such decisions
      of the Committee shall be final, conclusive and binding on all parties.

      The designation of an individual as a Participant for a particular Plan
      Year shall not confer upon such individual the right to be designated as a
      Participant in a subsequent Plan Year.

      An individual who has been designated by the Committee as a Participant
      for a Plan Year shall be notified in writing no later than January 1 of
      the Plan Year of such designation.

      UNGL shall deduct from any distributions made to Participants or
      Beneficiaries under this plan any applicable federal, state or local taxes
      which UNGL may be required to deduct under the law and all amounts
      distributed under this plan are stated herein before any such deductions.

      No Participant or other person shall have an interest in any fund or any
      specific assets of UNGL and subsidiaries by reason of being a Participant
      in this plan or any right to receive any distribution under the plan
      except and to the extent expressly provided in the plan.

      The designation of an individual as a Participant under this plan shall
      not be construed as conferring upon such individual any right to remain in
      the employ of UNGL and subsidiaries. With respect to any Participant, UNGL
      and subsidiaries' right to discipline, promote, demote, reassign or
      terminate for any reason it deems fit shall not be affected in any manner
      by reason of such individual's designation as a Participant in this plan.

      All questions or controversies arising in any manner between the parties
      or persons in connection with this plan or its operation, whether as to
      any claim for benefits, or as to the construction of language or meaning
      of the plan, or rules and regulations adopted by the Committee, or as to
      any writing, decision, instrument or account in connection with the
      operation of the plan or otherwise, shall be submitted to the Committee
      for decision. The decision of the Committee shall be binding upon all
      persons dealing with the plan.

IX.   NO ASSIGNMENT OF ALIENATION

      Except as otherwise required by law, no right or interest (which right
      shall simply be a contractual right) of any Participant hereunder shall be

                                       7
<PAGE>
      assigned, transferred or pledged voluntarily or involuntarily and any
      attempt to do so shall be void, nor shall such rights or interests be
      subject to attachment or other claims of creditors.

X.    GENERAL

      All actions taken or determinations made by the Committee shall be final
      and binding and all concerned and nothing in this plan shall be deemed to
      give any Participant, Beneficiary, legal representatives or assigns any
      right to participate in the plan except as determined by the Committee
      pursuant to the provisions in the plan.

XI.   PLAN AMENDMENT AND TERMINATION

      The Company reserves the right in its Board (or a duly authorized
      committee thereof) to amend, suspend or terminate the Plan or to adopt a
      new plan in place of this Plan at any time; provided, that no such
      amendment shall, without the prior approval of the Shareholders of the
      Company in accordance with applicable law to the extent required under
      Code Section 162(m): (i) materially alter the performance goals set forth
      in Article V; (ii) change the class of eligible employees set forth in
      Article IV; or (iii) implement any change to a provision of the Plan
      requiring Shareholder approval in order for the Plan to comply with the
      requirements of Code Section 162(m). Furthermore, no amendment, suspension
      or termination shall, without the consent of the Participant, alter or
      impair a Participant's right to receive payment of an Incentive Award for
      a Plan Year otherwise payable hereunder.

                                       8
<PAGE>
                                     ANNEX A

                              UNITED NATIONAL GROUP
                                  Key Personnel
TIER I

   Seth Freudberg, President/CEO

TIER II

  Richard March, Sr. Vice President, General Counsel
  Kevin Tate, Sr. Vice President/CFO
  Bill Schmidt, Sr. Vice President, Underwriting
  Bob Cohen, Sr. Vice President, Marketing
  Jonathan Ritz, Sr. Vice President, Ceded Reinsurance
  Timothy Dwyer, Sr. Vice President

TIER III

  Thomas McGeehan, Vice President, Finance & Accounting
  Jerry Hart, Vice President, Claims
  James McCreesh, Vice President/Chief Actuary
  James Pye, Vice President, Underwriting
  Viola Clements, Vice President, Underwritiing
  George Morris, Vice President, Underwriting
  William Scherr, Executive Vice President, JH Ferguson
  Robert Glettler, Vice President, Diamond State Insurance Co.
  Lynne Gerber-Saionz, Vice President, Associate General Counsel
  Linda Hohn, Vice President Regulatory Affairs
  Jack Freeston, Vice President, Information Systems
  Kathleen Morris Rosati, Vice President HR and Office Administration
  Steve Brodzinski, Vice President, Marketing

TIER IV

  Debra Donnelly, AVP, Accounting
  Michael Power, AVP, Reinsurance & Agency Accounting
  Gerry Durkin, 2nd VP, Claims
  Clarion Hesse, AVP Casualty Claims
  Dominic Conicello, AVP Property Claims
  Noreen Marshall, AVP Underwriting Operations
  Dianne Sprague, AVP Underwriting
  George Michaels, AVP Underwriting
  Maribeth Finley, AVP Information Systems

*    Daniel McFadden, Assistant Vice President, Financial Accounting

*    Melissa Houck, Assistant Vice President, Actuarial

*    Newly hired in September/October, 2003

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