SENIOR DEBT PORTFOLIO
POS AMI, 1998-03-31
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          As filed with the Securities and Exchange Commission on March 31, 1998
    

                                                               File No. 811-8876


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM N-2

                             REGISTRATION STATEMENT
                                      UNDER
                       THE INVESTMENT COMPANY ACT OF 1940        [ X ]

   
                                  AMENDMENT NO. 5                [ X ]
    

                              SENIOR DEBT PORTFOLIO
                              ---------------------
               (Exact Name of Registrant as Specified in Charter)


                        The Bank of Nova Scotia Building
                     P.O. Box 501, George Town, Grand Cayman
                       Cayman Islands, British West Indies
                       -----------------------------------
                    (Address of Principal Executive Offices)


                                 (809) 949-2001
                                 --------------
               Registrant's Telephone Number, including Area Code


                                 Alan R. Dynner
                 24 Federal Street, Boston, Massachusetts 02110
                 -----------------------------------------------
                     (Name and Address of Agent for Service)
<PAGE>

   
     Throughout this Registration Statement,  information concerning Senior Debt
Portfolio (the  "Portfolio") is incorporated by reference from the  Registration
Statement  Amendment  on Form N-2 of Eaton Vance Prime Rate  Reserves  (File No.
33-25731 under the  Securities Act of 1933 (the "1933 Act")) (the  "Amendment"),
which was filed  electronically  with the Securities and Exchange  Commission on
March 27, 1998 (Accession No. 0000950156-98-000288).  The Amendment contains the
prospectus and statement of additional  information ("SAI") of Eaton Vance Prime
Rate Reserves (the "Feeder Fund"), which invests substantially all of its assets
in the Portfolio.
    

                                     PART A

     Responses  to Items 1, 2, 3.2,  and 4 through 7 of Part A have been omitted
pursuant to Paragraph 3 of  Instruction  G of the General  Instructions  to Form
N-2.

ITEM 3. FEE TABLE AND SYNOPSIS

     Not Applicable.

ITEM 8.  GENERAL DESCRIPTION OF THE REGISTRANT

     (1) The Portfolio is a closed-end,  non-diversified  management  investment
company  which was  organized as a trust under the laws of the State of New York
on May 1,  1992.  Interests  in the  Portfolio  are  issued  solely  in  private
placement  transactions  that do not involve any  "public  offering"  within the
meaning of Section 4(2) of the 1933 Act.  Investments  in the  Portfolio  may be
made only by U.S. and foreign investment  companies,  common or commingled trust
funds,  organizations  or trusts  described in Sections  401(a) or 501(a) of the
Internal Revenue Code of 1986, as amended (the "Code"), or similar organizations
or entities that are "accredited  investors"  within the meaning of Regulation D
under the 1933 Act. This Registration Statement, as amended, does not constitute
an offer to sell, or the solicitation of an offer to buy, any "security"  within
the meaning of the 1933 Act.

     (2) - (4) Registrant  incorporates by reference information  concerning the
Portfolio's  investment  objective  and  investment  practices  from "The Fund's
Investment  Objective"  and  "Investment  Policies and Risks" in the Feeder Fund
prospectus.

   
     (5)  Investments  in the Portfolio  may not be  transferred.  However,  the
Portfolio will,  pursuant to Rule 23c-3 under the Investment Company Act of 1940
(the "1940 Act") and an exemptive  order obtained from the Commission  (File No.
812-10056),  make  offers  to  repurchase  at net asset  value a portion  of its
interests.  See "Fund  Repurchase  Officers" in the Feeder Fund  prospectus  and
"Investment  Restrictions"  in the Feeder Fund SAI.  Subject to the  Portfolio's
investment  restriction  with respect to  borrowings,  the  Portfolio may borrow
money or issue debt  obligations  to finance  its  repurchase  obligations.  See
"Investment Restrictions" in the Feeder Fund SAI.
    

         (6) Not applicable.

                                      A-1
<PAGE>

ITEM 9. MANAGEMENT

   
     (1)(a) - (c) Registrant  incorporates by reference  information  concerning
the Portfolio's management from "Organization of the Fund and the Portfolio" and
"Management of the Fund and the Portfolio" in the Feeder Fund prospectus.
    

     (1)(d)  ADMINISTRATOR.  IBT Trust Company (Cayman),  Ltd., The Bank of Nova
Scotia  Building,  P.O. Box 501,  George Town,  Grand  Cayman,  Cayman  Islands,
British West Indies,  maintains the Portfolio's  principal office and certain of
its records and provides  administrative  assistance in connection with meetings
of  the  Portfolio's  Trustees  and  interestholders,  for  which  services  the
Portfolio pays $1,500 per annum.

     (1)(e)  TRANSFER AGENT.  IBT Fund Services  (Canada) Inc., 1 First Canadian
Place, King Street West, Suite 2800, P.O. Box 231, Toronto,  Ontario, Canada M5X
IC8, a  subsidiary  of  Investors  Bank & Trust,  serves as  transfer  agent and
dividend-paying agent of the Portfolio and computes the daily net asset value of
interests in the Portfolio.

   
     CUSTODIAN.  Investors Bank & Trust Company,  200 Clarendon Street,  Boston,
Massachusetts 02116, acts as custodian for the Portfolio.
    

     (1)(f) The Portfolio is  responsible  for all of its expenses not expressly
stated  to  be  payable  by  the  other  party  under  the  Advisory  Agreement,
Administration Agreement or Placement Agent Agreement.

     (1)(g) Not applicable.

     (2) Not applicable.

   
     (3) CONTROL PERSONS. As of March 17, 1998, EV Classic Senior  Floating-Rate
Fund ("Classic  Fund") and the Feeder Fund controlled the Portfolio by virtue of
owning  approximately 50.7% and 45.4%,  respectively,  of the outstanding voting
interests  in  the  Portfolio.  The  Classic  Fund  and  Feeder  Fund  are  each
closed-end, management investment companies.
    

ITEM 10.  CAPITAL STOCK, LONG-TERM DEBT, AND OTHER SECURITIES

     (1)(a) - (f) Registrant  incorporates by reference  information  concerning
interests in the Portfolio from  "Organization of the Fund and the Portfolio" in
the Feeder Fund  prospectus and "Other  Information"  in the Feeder Fund SAI. An
interest in the Portfolio  has no  preemptive or conversion  rights and is fully
paid and nonassessable by the Portfolio, except as described under "Organization
of the Fund and the Portfolio" in the Feeder Fund prospectus.

     The  Portfolio's  net asset value is  determined  each day on which the New
York Stock Exchange (the  "Exchange") is open for trading  ("Portfolio  Business
Day"). This determination is made each Portfolio Business Day as of the close of
regular  trading  on the  Exchange  (currently  4:00  p.m.,  New York time) (the
"Portfolio Valuation Time").

                                      A-2
<PAGE>

   
     Each investor in the  Portfolio may add to its  investment in the Portfolio
on each Portfolio Business Day as of the Portfolio Valuation Time. Each investor
may reduce its  investment  in the  Portfolio  on a  quarterly  basis  through a
Portfolio  repurchase  offer.  The  value  of each  investor's  interest  in the
Portfolio will be determined by multiplying the net asset value of the Portfolio
by the  percentage,  determined  on the  prior  Portfolio  Business  Day,  which
represented that investor's share of the aggregate interests in the Portfolio on
such prior day. Any additions or withdrawals for the current Portfolio  Business
Day will then be recorded. Each investor's percentage of the aggregate interests
in the Portfolio will then be recomputed as a percentage equal to a fraction (i)
the  numerator  of  which  is the  value of such  investor's  investment  in the
Portfolio as of the Portfolio Valuation Time on the prior Portfolio Business Day
plus or minus, as the case may be, the amount of any additions to or withdrawals
from  the  investor's  investment  in the  Portfolio  on the  current  Portfolio
Business Day and (ii) the  denominator of which is the aggregate net asset value
of the  Portfolio  as of the  Portfolio  Valuation  Time on the prior  Portfolio
Business Day plus or minus,  as the case may be, the amount of the net additions
to or withdrawals from the aggregate  investment in the Portfolio on the current
Portfolio  Business Day by all  investors in the  Portfolio.  The  percentage so
determined  will  then be  applied  to  determine  the  value of the  investor's
interest in the Portfolio for the current Portfolio Business Day.
    

     (2) and (3) Not applicable.

     (4) The Portfolio  will allocate at least  annually among its investors its
net  investment  income,  net  realized  capital  gains,  and any other items of
income,  gain, loss,  deduction or credit. The Portfolio's net investment income
consists of all income accrued on the  Portfolio's  assets,  less all actual and
accrued  expenses of the  Portfolio,  determined  in accordance  with  generally
accepted accounting principles.

     Under the anticipated  method of operation of the Portfolio,  the Portfolio
will not be subject to any federal  income tax. See Item 22 in Part B.  However,
each investor in the Portfolio will take into account its allocable share of the
Portfolio's  ordinary  income and capital gain in determining its federal income
tax liability.  The  determination of each such share will be made in accordance
with the governing  instruments of the  Portfolio,  which are intended to comply
with the requirements of the Code and the regulations promulgated thereunder.

     It is intended  that the  Portfolio's  assets and income will be managed in
such a way  that an  investor  in the  Portfolio  that  seeks  to  qualify  as a
regulated  investment company ("RIC") under the Code will be able to satisfy the
requirements for such qualification.

     (5) See Item 28 of Part C of this Registration Statement.

     (6) Not applicable.

ITEM 11.  DEFAULTS AND ARREARS ON SENIOR SECURITIES

     Not applicable.

                                      A-3
<PAGE>

ITEM 12.  LEGAL PROCEEDINGS

     Not applicable.

ITEM 13.  TABLE OF CONTENTS OF STATEMENT OF ADDITIONAL INFORMATION

     Not applicable.

                                      A-4
<PAGE>

                                     PART B

ITEM 14.  COVER PAGE

     Not applicable.

ITEM 15.  TABLE OF CONTENTS

                                                                         Page
     General Information and History.....................................B-1
     Investment Objective and Policies...................................B-1
     Management..........................................................B-1
     Control Persons and Principal Holders of Securities.................B-2
     Investment Advisory and Other Services..............................B-2
     Brokerage Allocation and Other Practices............................B-2
     Tax Status..........................................................B-2
     Financial Statements................................................B-4

ITEM 16. GENERAL INFORMATION AND HISTORY

     Not applicable.

ITEM 17. INVESTMENT OBJECTIVE AND POLICIES

     Part A contains additional  information about the investment  objective and
policies of the Portfolio.  This Part B should be read in conjunction  with Part
A.  Capitalized  terms used in this Part B and not  otherwise  defined  have the
meanings given them in Part A.

     (1) - (3)  Registrant  incorporates  by  reference  additional  information
concerning  the  investment  policies of the  Portfolio  as well as  information
concerning  the  investment  restrictions  of  the  Portfolio  from  "Additional
Information  about  Investment  Policies" and "Investment  Restrictions"  in the
Feeder Fund SAI.

   
     (4) The  Portfolio's  portfolio  turnover  rates for the fiscal years ended
December 31, 1996 and 1997 were 75% and 81%, respectively.
    

ITEM 18.  MANAGEMENT

     Registrant  incorporates by reference additional information concerning the
management of the Portfolio from "Trustees and Officers" in the Feeder Fund SAI.

                                      B-1
<PAGE>

ITEM 19.  CONTROL  PERSONS AND PRINCIPAL  HOLDERS OF SECURITIES

   
     (1) and (2) See Item 9 (3) above.  The  Classic  Fund's  and Feeder  Fund's
principal business address is 24 Federal Street,  Boston,  Massachusetts  02110.
Because the Classic Fund controls the Portfolio, it may take actions without the
approval  of any other  investor.  The  Classic  Fund and the  Feeder  Fund have
informed  the  Portfolio  that  whenever  they are  requested to vote on matters
pertaining  to the  fundamental  policies  of the  Portfolio,  they  will hold a
meeting  of  shareholders  and will  cast  their  votes as  instructed  by their
shareholders.  It is anticipated  that any other investor in the Portfolio which
is an investment  company registered under the 1940 Act would follow the same or
a similar  practice.  The Classic  Fund and the Feeder Fund are each  closed-end
management  investment  companies organized as business trusts under the laws of
the Commonwealth of Massachusetts.

     (3) As of March 17, 1998, the Trustees and officers of the Portfolio,  as a
group, did not own any interests in the Portfolio.
    

ITEM 20.  INVESTMENT ADVISORY AND OTHER SERVICES

     Registrant  incorporates  by reference  information  concerning  investment
advisory and other services provided to the Portfolio from "Investment  Advisory
and Other Services", "Custodian" and "Auditors " in the Feeder Fund SAI.

ITEM 21.  BROKERAGE ALLOCATION AND OTHER PRACTICES

     Registrant  incorporates by reference information  concerning the brokerage
practices of the Portfolio from "Portfolio Trading" in the Feeder Fund SAI.

ITEM 22.  TAX STATUS

   
     The  Portfolio  has  received a revenue  ruling from the  Internal  Revenue
Service  that,  provided  the  Portfolio  is  operated  at all times  during its
existence in accordance with certain  organizational and operational  documents,
the  Portfolio  should be classified  as a  partnership  under the Code,  and it
should not be a "publicly traded partnership" within the meaning of Section 7704
of the  Code.  Consequently,  the  Portfolio  does  not  expect  that it will be
required  to pay any federal  income tax,  and a Holder will be required to take
into account in  determining  its federal  income tax liability its share of the
Portfolio's income, gains, losses, deductions and credits.

     Under Subchapter K of the Code, a partnership is considered to be either an
aggregate of its members or a separate  entity,  depending  upon the factual and
legal context in which the question arises.  Under the aggregate approach,  each
partner is treated as an owner of an undivided  interest in  partnership  assets
and  operations.  Under the entity  approach,  the  partnership  is treated as a
separate entity in which partners have no direct interest in partnership  assets
and operations.  The Portfolio has been advised by tax counsel that, in the case
of a Holder that seeks to qualify as a RIC, the aggregate approach should apply,
and  each such  Holder should  accordingly be  deemed  to  own  a  proportionate

                                      B-2
<PAGE>

share of each of the assets of the  Portfolio  and to be  entitled  to the gross
income  of  the  Portfolio  attributable  to  that  share  for  purposes  of all
requirements of Sections 851(b), 852(b)(5), 853(a) and 854 of the Code. Further,
the  Portfolio  has been  advised by tax counsel  that each Holder that seeks to
qualify  as a RIC  should  be  deemed  to hold  its  proportionate  share of the
Portfolio's  assets for the period the  Portfolio has held the assets or for the
period the Holder has been an investor in the  Portfolio,  whichever is shorter.
Investors should consult their tax advisers  regarding whether the entity or the
aggregate  approach  applies to their  investment  in the  Portfolio in light of
their particular tax status and any special tax rules applicable to them.

     In order to enable a Holder  (that is  otherwise  eligible) to qualify as a
RIC under the Code,  the  Portfolio  intends  to  satisfy  the  requirements  of
Subchapter M of the Code  relating to sources of income and  diversification  of
assets as if they were applicable to the Portfolio and to permit  withdrawals in
a  manner  that  will  enable  an  investor  which is a RIC to  comply  with the
distribution requirements applicable to RICs (including those under Sections 852
and 4982 of the Code).  The Portfolio  will  allocate at least  annually to each
Holder  such  Holder's  distributive  share of the  Portfolio's  net  investment
income,  net realized capital gains, and any other items of income,  gain, loss,
deduction or credit in a manner  intended to comply with the Code and applicable
Treasury regulations. Tax counsel has advised the Portfolio that the Portfolio's
allocations  of taxable  income and loss should  have  "economic  effect"  under
applicable Treasury regulations.

     To  the  extent  cash  proceeds  of  any  withdrawal   (or,  under  certain
circumstances,  such  proceeds  plus  the  value  of any  marketable  securities
distributed to an investor) ("liquid proceeds") exceed a Holder's adjusted basis
of his interest in the Portfolio,  the Holder will generally  realize a gain for
federal income tax purposes.  If, upon a complete withdrawal  (repurchase of the
entire  interest),  a Holder  receives only liquid proceeds  (and/or  unrealized
receivables) and the Holder's  adjusted basis of his interest exceeds the liquid
proceeds  of such  withdrawal,  the  Holder  will  generally  realize a loss for
federal income tax purposes. In addition, on a distribution to a Holder from the
Portfolio  (whether pursuant to a partial or complete  withdrawal or otherwise),
(1) income or gain will be recognized if the  distribution  is in liquidation of
the Holder's  entire  interest in the Portfolio and includes a  disproportionate
share of any unrealized  receivables  held by the Portfolio and (2) gain or loss
may be recognized on a distribution to a Holder that contributed property to the
Portfolio.  The tax  consequences of a withdrawal of property  (instead of or in
addition to liquid  proceeds)  will be different and will depend on the specific
factual circumstances. A Holder's adjusted basis of an interest in the Portfolio
will be the aggregate  prices paid  therefor  (including  the adjusted  basis of
contributed  property  and any gain  recognized  on the  contribution  thereof),
increased by the amounts of the Holder's  distributive  share of items of income
(including interest income exempt from federal income tax) and realized net gain
of the  Portfolio,  and reduced,  but not below zero,  by (i) the amounts of the
Holder's  distributive  share of items of Portfolio loss, and (ii) the amount of
any cash distributions  (including  distributions of interest income exempt from
federal income tax and cash distributions on withdrawals from the Portfolio) and
the basis to the Holder of any  property  received by such Holder  other than in
liquidation,  and  (iii)  the  Holder's  distributive  share of the  Portfolio's
nondeductible expenditures not properly chargeable to capital account. Increases
or decreases in a Holder's share of the Portfolio's  liabilities may also result
in corresponding increases or decreases in such adjusted basis.
    
                                      B-3
<PAGE>

     The Portfolio may be subject to foreign  withholding  taxes with respect to
income on certain  loans to  foreign  Borrowers.  These  taxes may be reduced or
eliminated  under  the  terms of an  applicable  U.S.  income  tax  treaty.  The
anticipated  extent of the Portfolio's  investment in foreign securities is such
that it is not  expected  that a Holder  that is a RIC will be  eligible to pass
through to its shareholders foreign taxes paid by the Portfolio and allocated to
the Holder,  so that  shareholders of such a RIC will not be entitled to foreign
tax credits or deductions  for foreign taxes paid by the Portfolio and allocated
to the RIC.  Certain foreign exchange gains and losses realized by the Portfolio
and allocated to the RIC will be treated as ordinary income and losses.  Certain
uses of foreign currency and investment by the Portfolio in the stock of certain
"passive foreign  investment  companies" may be limited or a tax election may be
made, if available, in order to enable an investor that is a RIC to preserve its
qualification as a RIC or to avoid imposition of a tax on such an investor.

     An entity  that is treated  as a  partnership  under the Code,  such as the
Portfolio, is generally treated as a partnership under state and local tax laws,
but certain states may have  different  entity  classification  criteria and may
therefore  reach  a  different  conclusion.  Entities  that  are  classified  as
partnerships  are not treated as taxable entities under most state and local tax
laws,  and the income of a  partnership  is  considered to be income of partners
both in timing and in character. The laws of the various states and local taxing
authorities vary with respect to the taxation of such interest  income,  as well
as to the status of a partnership  interest  under state and local tax laws, and
each holder of an interest  in the  Portfolio  is advised to consult his own tax
adviser.

     The foregoing  discussion does not address the special tax rules applicable
to  certain  classes  of  investors,  such  as  tax-exempt  entities,  insurance
companies and financial  institutions.  Investors  should  consult their own tax
advisers  with  respect to special tax rules that may apply in their  particular
situations, as well as the state, local or foreign tax consequences of investing
in the Portfolio.

ITEM 23.  FINANCIAL STATEMENTS

     The   following   audited   financial   statements  of  the  Portfolio  are
incorporated  by  reference  into this Part B and have been so  incorporated  in
reliance  upon the report of  Deloitte & Touche,  independent  certified  public
accountants, as experts in accounting and auditing.

   
     Portfolio of Investments as of December 31, 1997
     Statement of Assets and Liabilities as of December 31, 1997
     Statement of Operations for the fiscal year ended December 31, 1997
     Statements of Changes in Net Assets for the fiscal years ended December 31,
     1997 and 1996
     Statement of Cash Flows for the fiscal year ended December 31, 1997
     Supplementary  Data for the fiscal years ended December  31, 1997 and 1996,
     and for the  period  from the start of  business,  February  22,  1995,  to
     December 31, 1995
     Notes to Financial Statements
     Independent Auditors' Report

     For  purposes  of the EDGAR  filing of this  amendment  to the  Portfolio's
registration  statement,  the  Portfolio  incorporates  by  reference  the above
audited  financial  statements,  as  previously  filed  electronically  with the
Commission (Accession Number 0000950156-98-000155).
    

                                      B-4
<PAGE>

                                     PART C

                               OTHER INFORMATION

ITEM 24.  FINANCIAL STATEMENTS AND EXHIBITS

(1)       FINANCIAL  STATEMENTS:

          The financial  statements  called for by this item are incorporated by
          reference in Part B and listed in Item 23 hereof.

(2)       EXHIBITS:

          (a)  Amended and  Restated  Declaration  of Trust dated as of November
               21,  1994,   filed  as  Exhibit  (a)  to  Amendment   No.  3  and
               incorporated herein by reference.

          (b)  By-Laws adopted May 1, 1992 filed as Exhibit (b) to Amendment No.
               3 and incorporated herein by reference.

          (c)  Not applicable.

          (d)  Not applicable.

          (e)  Not applicable.

          (f)  Not applicable.

          (g)  Investment  Advisory  Agreement between the Registrant and Boston
               Management  and Research dated February 22, 1995 filed as Exhibit
               (g) to Amendment No. 3 and incorporated herein by reference.

   
          (h)  Placement  Agent  Agreement with Eaton Vance  Distributors,  Inc.
               dated  November 1, 1996,  filed as Exhibit (h) to Amendment No. 4
               and incorporated herein by reference.
    

          (i)  The Securities and Exchange Commission has granted the Registrant
               an  exemptive  order that  permits the  Registrant  to enter into
               deferred compensation arrangements with its independent Trustees.
               See IN THE MATTER OF CAPITAL  EXCHANGE  FUND,  INC.,  Release No.
               IC-20671 (November 1, 1994).

   
          (j)  Custodian  Agreement  with  Investors  Bank & Trust Company dated
               February  14,  1997 filed as Exhibit (j) to  Amendment  No. 4 and
               incorporated herein by reference.
    

          (k)  (1) Accounting  and  Interestholder  Services  Agreement with IBT
               Fund Services  (Canada) Inc.  dated  December 30, 1994,  filed as
               Exhibit  (k)(1) to  Amendment  No. 2 and  incorporated  herein by
               reference.

                                      C-1
<PAGE>

               (2) Administration Agreement with IBT Trust Company (Cayman) Ltd.
               dated October 23, 1995 filed as Exhibit (k)(2) to Amendment No. 3
               and incorporated herein by reference.

          (1)  Not applicable.

          (m)  Not applicable.

          (n)  Not applicable.

          (o)  Not applicable.

          (p)  Investment   representation   letter  of  Boston  Management  and
               Research dated October 25, 1994 filed as Exhibit (p) to Amendment
               No. 3 and incorporated herein by reference.

          (q)  Not applicable.

          (r)  Not applicable.

ITEM 25.  MARKETING ARRANGEMENTS

     Not applicable.

ITEM 26.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     Not applicable.

ITEM 27.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL

     None.

ITEM 28. NUMBER OF HOLDERS OF SECURITIES

   
                     (1)                                (2)
                                                     Number of
                Title of Class                    Record Holders
                --------------                    --------------

                   Interests                   As of March 17, 1998
                                                        5
    

ITEM 29. INDEMNIFICATION

     Article V of the  Registrant's  Amended and Restated  Declaration  of Trust
contains indemnification  provisions for Trustees and officers. The Trustees and
officers of the  Registrant  and the  personnel of the  Registrant's  investment
adviser are insured under an errors and omissions liability insurance policy.

                                      C-2
<PAGE>

     The Placement Agent Agreement also provides for reciprocal indemnity of the
placement agent, on the one hand, and the Trustees and officers, on the other.

ITEM 30. BUSINESS AND OTHER CONNECTIONS OF THE INVESTMENT ADVISER

     To the knowledge of the Portfolio,  none of the trustees or officers of the
Portfolio's  investment  adviser,  except  as set forth on its Form ADV as filed
with the Securities and Exchange  Commission,  is engaged in any other business,
profession,  vocation or employment of a substantial nature, except that certain
trustees and officers  also hold various  positions  with and engage in business
for affiliates of the investment adviser.

ITEM 31.  LOCATION OF ACCOUNTS AND RECORDS

   
     All applicable  accounts,  books and documents required to be maintained by
the  Registrant  by Section  31(a) of the 1940 Act,  as  amended,  and the Rules
promulgated  thereunder are in the  possession  and custody of the  Registrant's
custodian,  Investors Bank & Trust Company,  200 Clarendon  Street,  Boston,  MA
02116, with the exception of certain  corporate  documents and portfolio trading
documents that are in the possession and custody of the Registrant's  investment
adviser,  Boston Management and Research Management,  24 Federal Street, Boston,
MA 02110.  Certain corporate  documents are also maintained by IBT Trust Company
(Cayman)  Ltd.,  The Bank of Nova Scotia  Building,  P.O. Box 501,  George Town,
Grand Cayman, Cayman Islands,  British West Indies, and certain investor account
and Portfolio  accounting records are held by IBT Fund Services (Canada) Inc., 1
First  Canadian  Place,  King Street West,  Suite 2800,  P.O. Box 231,  Toronto,
Ontario,  Canada  M5X lC8.  The  Registrant  is  informed  that  all  applicable
accounts, books and documents required to be maintained by registered investment
advisers are in the custody and possession of Registrant's investment adviser.
    

ITEM 32.  MANAGEMENT SERVICES

     None.

ITEM 33.  UNDERTAKINGS

     Not applicable.

                                      C-3
<PAGE>


                                   SIGNATURES



   
     Pursuant to the  requirements  of the  Investment  Company Act of 1940, the
Registrant has duly caused this Amendment to the Registration  Statement on Form
N-2 to be signed on its behalf by the undersigned, thereunto duly authorized, in
Boston, Massachusetts on the 30th day of March, 1998.
    

                                  SENIOR DEBT PORTFOLIO

                                  By: /s/ James B. Hawkes
                                      --------------------
                                      James B. Hawkes
                                      President

                                      C-4
<PAGE>


                                  EXHIBIT INDEX


Exhibit No.             Description of Exhibit
- -----------             ----------------------

Not applicable
       


                                      C-5

<TABLE> <S> <C>

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   <NAME> SENIOR DEBT PORTFOLIO
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