SUN LIFE OF CANADA U S VARIABLE ACCOUNT F
485BPOS, 2000-09-11
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<PAGE>


   As Filed with the Securities and Exchange Commission on September 11,  2000

                                                      REGISTRATION NO. 333-82957
                                                                       811-05846
--------------------------------------------------------------------------------
                         SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C. 20549

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

                                      FORM N-4


                         POST-EFFECTIVE AMENDMENT NO. 4 TO                 /X/

              REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                                        AND

                                AMENDMENT NO. 29 TO                         /X/

                    REGISTRATION STATEMENT UNDER THE INVESTMENT
                                COMPANY ACT OF 1940

                    SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT F
                             (Exact Name of Registrant)

                    SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
                                (Name of Depositor)

                            ONE SUN LIFE EXECUTIVE PARK
                        WELLESLEY HILLS, MASSACHUSETTS 02181
                (Address of Depositor's Principal Executive Offices)

                    DEPOSITOR'S TELEPHONE NUMBER: (781) 237-6030

             EDWARD M. SHEA, ASSISTANT VICE PRESIDENT AND SENIOR COUNSEL
                    SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
                                  ONE COPLEY PLACE
                            BOSTON, MASSACHUSETTS 02116
                      (Name and Address of Agent for Service)

                            COPIES OF COMMUNICATIONS TO:
                                 JOAN E. BOROS, ESQ.
                  JORDEN BURT BOROS CICCHETTI BERENSON & JOHNSON LLP
                           1025 THOMAS JEFFERSON STREET, N.W.
                                     SUITE 400 EAST
                                 WASHINGTON, D.C. 20007

--------------------------------------------------------------------------------
Approximate Date of Proposed Public Offering: Continuous

It is proposed that this filing will become effective (check appropriate
box):

  [ ] Immediately upon filing pursuant to paragraph (b) of Rule 485.

  [X] On September 11, 2000 pursuant to paragraph (b) of Rule 485.

  [ ] 60 days after filing pursuant to paragraph (a)(1) of Rule 485.

  [ ] On (date) pursuant to paragraph (a)(1) of Rule 485.

If appropriate, check the following box:

  [ ] This post-effective amendment designates a new effective date for
      previously filed post-effective amendment.

Title of securities being registered:

  Units of interest in Separate Account under variable annuity contracts.

This Amendment to the Registration Statement on Form N-4 (File No. 333-82957),
which became effective on October 14, 1999 (the "Registration Statement"), is
being filed pursuant to Rule 485(b) under the Securities Exchange Act of
1933, as amended, to supplement the prospectus and profile contained in the
Registration Statement for the MFS Regatta Extra Variable and Fixed Annuity.


The supplement included in this Amendment describes additional variable
investment options to be made available under the MFS Regatta Extra annuity
contract offered pursuant to the Registration Statement. This Amendment relates
only to the supplement to the prospectus and profile for the MFS Regatta Extra
annuity product incorporated by reference in this Amendment and does not
otherwise delete, amend or supersede any information contained in the
Registration Statement, as amended.



<PAGE>
                                       PART A

                        INFORMATION REQUIRED IN A PROSPECTUS

    Attached hereto and made a part hereof is a Supplement to the Prospectus
dated April 10, 2000, as supplemented by Supplement dated June 26, 2000
(incorporated herein, together with the Profile and Prospectus dated April
10, 2000 for the Futurity Accolade Variable and Fixed Annuity, as
supplemented by Supplement dated June 26, 2000, by reference from
Post-Effective Amendments No. 2 and No. 3 to the Registration Statement on
Form N-4 (Registration No. 333-82957) filed March 31, 2000 and June 26, 2000,
respectively), for the following:


               MFS Regatta Extra Variable and Fixed Annuity


<PAGE>

                       SUPPLEMENT DATED SEPTEMBER 11, 2000

                                       TO

                  PROFILE DATED APRIL 10, 2000, AS SUPPLEMENTED
                                       AND
                 PROSPECTUS DATED APRIL 10 2000, AS SUPPLEMENTED

                                       FOR

                                MFS REGATTA EXTRA
                           VARIABLE AND FIXED ANNUITY


              ISSUED BY SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)


     Effective immediately, with the addition of 2 new Funds -- the Global
Telecommunications Series and the Mid Cap Growth Series -- to the MFS/Sun Life
Series Trust (the "Series Fund"), you may allocate your money among 29 variable
investment options available under the MFS Regatta Extra Variable and Fixed
Annuity. Market conditions will determine the value of an investment in the
Global Telecommunications Series, the Mid Cap Growth Series and any other Fund.
The Global Telecommunications Series, the Mid Cap Growth Series and the other
Funds available as variable investment options under the Contract are described
more fully in the current Series Fund prospectus, as supplemented.



     As a result of the addition of the Global Telecommunication Series and the
Mid Cap Growth Series, the Profile dated April 10, 2000, as supplemented by a
Supplement dated June 26, 2000 (the "Profile") for the Contract, and the
Prospectus dated April 10, 2000, as supplemented by a Supplement dated June 26,
2000 (the "Prospectus") for the Contract, are amended and supplemented as
follows. Also, certain additional amendments are made to the Prospectus and
Profile as follows:


     1. The third paragraph of Section 1, "The MFS Regatta Extra Annuity," of
the Profile and the second paragraph on the cover page of the Prospectus are
each amended by deleting the first sentence in its entirety and replacing it
with the following:

     "You may choose among 29 variable investment options and a range of fixed
     options."

     2. The list of the available investment options appearing in Section 4,
"Allocation Options," of the Profile and on the cover page of the Prospectus is
hereby supplemented by the addition of the Global Telecommunication Series and
the Mid Cap Growth Series.

     3. The summary expense chart appearing in Section 5, "Expenses," of the
Profile is hereby supplemented as follows:


<TABLE>
<CAPTION>

                                                                                      EXAMPLES:
                                    TOTAL ANNUAL      TOTAL ANNUAL      TOTAL       TOTAL EXPENSES
                                     INSURANCE            FUND         ANNUAL           AT END
SUB-ACCOUNT                           CHARGES           EXPENSES      EXPENSES    1 YEAR   10 YEARS
------------                        -------------     -------------   --------    -------  --------
<S>                                 <C>               <C>             <C>         <C>      <C>
Global Telecommunications Series...    1.55%              1.25%          2.80%      $101    $325
Mid Cap Growth Series .............    1.55%              1.00%          2.55%      $ 98    $300
</TABLE>



<PAGE>

     4. The "Underlying Fund Annual Expenses" table appearing on page 5 of the
Prospectus is hereby amended and supplemented as follows:

<TABLE>
<CAPTION>

                                                                OTHER FUND              TOTAL ANNUAL
                                             MANAGEMENT         EXPENSES (2)         FUND EXPENSES (2)
                                                FEES       (AFTER REIMBURSEMENT)   (AFTER REIMBURSEMENT)
                                             ----------   ----------------------  ----------------------
<S>                                          <C>          <C>                     <C>
Global Telecommunications Series (3)......      1.00%             0.25%                     1.25%
Mid Cap Growth Series (3).................      0.75%             0.25%                     1.00%
Technology Series (3) ....................      0.75%             0.25%                     1.00%
</TABLE>

     5. The footnotes to the "Underlying Fund Annual Expenses" table are amended
and supplemented as follows:

      (i) Footnote (1) is deleted in its entirety and replaced by the
          following:

          (1)  The information relating to Fund expenses was provided by
               the Funds and we have not independently verified it. You
               should consult the Fund prospectus(es) for more information
               about Fund expenses. For all Funds except the Technology
               Series, the Global Telecommunications Series and the Mid
               Cap Growth Series, "Management Fees," "Other Fund
               Expenses," and "Total Annual Fund Expenses" are based on
               actual expenses for the fiscal year ended December 31, 1999,
               net of any applicable expense reimbursement or waiver.
               Expense figures shown for the Technology Series, the Global
               Telecommunications Series and the Mid Cap Growth Series
               are estimates for the year 2000, based on the applicable
               expense reimbursement waiver. No actual expense figures are
               shown for the Technology Series, the Global Telecommunications
               Series or the Mid Cap Growth Series because these Funds
               commenced operations in June 2000, September 2000 and
               September 2000, respectively, and, therefore, have less than 12
               months of investment performance.



         (ii)  Footnote (2) is amended and restated as follows:

               (2) Each Fund has an expense offset arrangement which reduces
                   the Fund's custodian fee based upon the amount of cash
                   maintained by the Fund with its custodian and dividend
                   disbursing agent, and may enter into such other arrangements
                   and directed brokerage arrangements (which would also have
                   the effect of reducing the Fund's expenses). Any such fee
                   reductions are not reflected under "Other Expenses" in the
                   table. Had these fees been taken into account, "Total Fund
                   Expenses" for certain of the Funds would be as follows:

<TABLE>
                   <S>                                                <C>
                   Bond Series......................................  0.71%
                   Capital Appreciation Series......................  0.75%
                   Capital Opportunities Series.....................  0.83%
                   Equity Income Series.............................  0.91%
                   Global Asset Allocation Series...................  0.88%
                   New Discovery Series.............................  1.05%
                   Strategic Income Series..........................  1.03%
                   Utilities Series.................................  0.81%
</TABLE>


        (iii)  Footnote (3) is amended and restated as follows:

               (3) MFS has contractually agreed to bear the expenses of these
                   Funds such that "Other Fund Expenses," after taking into
                   account the expense offset arrangement described in Footnote
                   (2) above, will not exceed 0.25% annually. This contractual
                   arrangement will continue until at least May 1, 2001, unless
                   changed with the consent of the Series Fund's Board of
                   Trustees; provided, however, that this contractual
                   arrangement will terminate prior to May 1, 2001 in the event
                   that "Other Fund Expenses" equal or fall below 0.25%
                   annually. Without taking into account this fee waiver and/or
                   expense reimbursement, "Other Fund Expenses" would be
                   estimated to be 3.26% for the Strategic Growth Series, 0.28%
                   for the Technology Series, 0.76% for the Global
                   Telecommunications Series, and 0.67% for the Mid Cap Growth
                   Series.


          (iv) Footnote (4) is deleted in its entirety.


     6. The "Examples" presented on pages 6 and 7 of the Prospectus are
supplemented as follows:

     If you surrender your Contract at the end of the applicable time period,
you would pay the following expenses on a $1,000 investment, assuming a 5%
annual return and an average Contract size of $35,000:


<TABLE>
<CAPTION>
                                              1 YEAR     3 YEARS     5 YEARS     10 YEARS
                                              ------     -------     -------     --------
<S>                                           <C>        <C>         <C>         <C>
Global Telecommunications Series .........     $101       $152         $205        $325
Mid Cap Growth Series ....................     $ 98       $144         $193        $300
</TABLE>


<PAGE>

          If you do NOT surrender your Contract at the end of the applicable
time period, you would pay the following expenses on a $1,000 investment,
assuming a 5% annual return and an average Contract size of $35,000:


<TABLE>
<CAPTION>
                                              1 YEAR     3 YEARS     5 YEARS     10 YEARS
                                              ------     -------     -------     --------
<S>                                           <C>        <C>         <C>         <C>
Global Telecommunications Series...........    $29         $89        $151         $325
Mid Cap Growth Series......................    $26         $81        $139         $300
</TABLE>


         7. The "Variable Account Options: The MFS/Sun Life Series Trust"
section beginning on page 9 of the Prospectus is supplemented as follows:


    (a) The second paragraph of the section on page 9 is deleted in its entirety
        and replaced by the following:

            "The Series Fund is composed of 30 independent portfolios of
        securities, each of which has separate investment objectives and
        policies. Shares of the Series Fund are issued in 30 series (each,
        a "Fund"), each corresponding to one of the portfolios. The Contract
        provides for investment by the Sub-Accounts in shares of the 29 Funds
        described below. Additional portfolios may be added to the Series Fund
        which may or may not be available for investment by the Variable
        Account."

    (b) The following Fund descriptions are added:

               GLOBAL TELECOMMUNICATIONS SERIES will seek to achieve long-term
               growth of capital.

               MID CAP GROWTH SERIES will seek long-term growth of capital.


THIS SUPPLEMENT IS NOT VALID UNLESS ACCOMPANIED OR PRECEDED BY THE CURRENT
PROSPECTUS FOR THE MFS REGATTA EXTRA VARIABLE AND FIXED ANNUITY, AND THE CURRENT
FUND PROSPECTUS(ES). THIS SUPPLEMENT AND THE PROSPECTUSES SHOULD BE READ AND
RETAINED FOR FUTURE REFERENCE.


EXTRASUPP 9/00


<PAGE>

                                       PART B
                       INFORMATION REQUIRED IN A STATEMENT OF
                               ADDITIONAL INFORMATION

     Incorporated by reference to Post-Effective Amendment No. 2 to the
Registration Statement on Form N-4 (Registration No. 333-82957), filed
March 31, 2000, is the Statement of Additional Information dated April 10,
2000 for each of the following:

             Futurity Accolade Variable and Fixed Annuity
             MFS Regatta Extra Variable and Fixed Annuity

<PAGE>

                                       PART C

                                 OTHER INFORMATION

Item 24. FINANCIAL STATEMENTS AND EXHIBITS

         (a)   The following Financial Statements are incorporated in this
               Post-Effective Amendment to the Registration Statement by
               reference to Post-Effective Amendment No. 2 to the
               Registration Statement on Form N-4 (File No. 333-82957),
               filed March 31, 2000:

          Included in Part A:

             A.     Condensed Financial Information - Accumulation Unit Values.

             B.     Financial Statements of the Depositor:

                       1.     Statutory Statements of Admitted Assets,
                              Liabilities and Capital Stock and Surplus,
                              December 31, 1998 and 1997;
                       2.     Statutory Statements of Operations, Years Ended
                              December 31, 1998, 1997 and 1996;
                       3.     Statutory Statements of Changes in Capital Stock
                              and Surplus, Years Ended December 31, 1998, 1997
                              and 1996;
                       4.     Statutory Statements of Cash Flow, Years Ended
                              December 31, 1998, 1997 and 1996;
                       5.     Notes to Statutory Financial Statements; and
                       6.     Independent Auditors' Report.

         Included in Part B:

             A.     Financial Statements of the Registrant:

                       1.     Statement of Condition, December 31, 1998;
                       2.     Statement of Operations, Year Ended December 31,
                              1998;
                       3.     Statements of Changes in Net Assets, Years Ended
                              December 31, 1998 and December 31, 1997;
                       4.     Notes to Financial Statements; and
                       5.     Independent Auditors' Report.

         (b)   The following Exhibits are incorporated in the Registration
               Statement by reference unless otherwise indicated:

              (1)             Resolution of Board of Directors of the Depositor
                              dated December 3, 1985 authorizing the
                              establishment of the Registrant (Incorporated
                              herein by reference to Exhibit 1 to the
                              Registration Statement of the Registrant on Form
                              N-4, File No. 333-37907, filed on October 14,
                              1997);

              (2)             Not Applicable;

              (3)(a)          Distribution Agreement between the Depositor,
                              Massachusetts Financial Services Company and
                              Clarendon Insurance Agency, Inc. (Incorporated
                              herein by reference to Exhibit 3(a) to
                              Pre-Effective Amendment No. 1 to the Registration
                              Statement of the Registrant on Form N-4, File No.
                              333-37907, filed on January 16, 1998);

                 (b)(i)       Specimen Sales Operations and General Agent
                              Agreement (Incorporated herein by reference to
                              Exhibit 3(b)(i) to Pre-Effective Amendment No. 1
                              to the Registration Statement of the Registrant on
                              Form N-4, File No. 333-37907, filed on January 16,
                              1998);

                 (b)(ii)      Specimen Broker-Dealer Supervisory and Service
                              Agreement (Incorporated herein by reference to
                              Exhibit 3(b)(ii) to Pre-Effective Amendment No. 1
                              to the Registration Statement of the Registrant on
                              Form N-4, File No. 333-37907, filed on January 16,
                              1998);


                 (b)(iii)     Specimen Registered Representatives Agent
                              Agreement (Incorporated herein by reference to
                              Exhibit 3(b)(iii) to Pre-Effective Amendment No.
                              1 to the Registration Statement of the Registrant
                              on Form N-4, File No. 333-37907, filed on January
                              16, 1998);

<PAGE>


              (4)(a)(i)       Form of Flexible Payment Combination
                              Fixed/Variable Group Annuity Contract
                              (Incorporated herein by reference to
                              Pre-Effective Amendment No. 1 to the
                              Registration Statement of the Registrant
                              on Form N-4, File No. 333-82957, filed
                              September 29, 1999);

                 (b)(i)       Form of Certificate to be issued in connection
                              with Contract filed as Exhibit 4(a)(i)
                              (Incorporated herein by reference to
                              Pre-Effective Amendment No. 1 to  the
                              Registration Statement of the Registrant on
                              Form N-4, File No. 333-82957, filed September 29,
                              1999);

                 (c)(i)       Form of Flexible Payment Combination
                              Fixed/Variable Individual Annuity Contract
                              (Incorporated herein by reference to
                              Pre-Effective Amendment No. 1 to the
                              Registration Statement of the Registrant
                              on Form N-4, File No. 333-82957, filed
                              September 29, 1999);

                 (d)(i)       Form of Qualified Plan Endorsement (Incorporated
                              herein by reference to Post-Effective Amendment
                              No. 1 to the Registration Statement of the
                              Registrant on Form N-4, File No. 333-82957,
                              filed February 3, 2000);

              (5)(a)(i)       Form of Application to be used with
                              Contract filed as Exhibit 4(a)(i)
                              (Incorporated herein by reference to
                              Pre-Effective Amendment No. 1 to the
                              Registration Statement of the Registrant
                              on Form N-4, File No. 333-82957, filed
                              September 29, 1999);

                 (b)(i)       Form of Application to be used with
                              Certificate filed as Exhibit 4(b)(i) and
                              Contract filed as Exhibit 4(c)(i)
                              (Incorporated herein by reference to
                              Pre-Effective Amendment No. 1 to the
                              Registration Statement of the Registrant
                              on Form N-4, File No. 333-82957, filed
                              September 29, 1999);

              (6)(a)          Certificate of Incorporation and By-laws of the
                              Depositor (Incorporated herein by reference to
                              Exhibits 3(a) and 3(b), respectively, to the
                              Registration Statement of the Depositor on Form
                              S-1, File No. 333-37907, filed on October 14,
                              1997);

                 (b)          By-Laws of the Depositor, as amended effective
                              as of January 1, 2000 (Incorporated herein by
                              reference to Pre-Effective Amendment No. 1 to the
                              Registration Statement on Form N-4, File No.
                              333-30844, filed on June 9, 2000:

              (7)             Not Applicable;

              (8)(a)          Form of Participation Agreement by and between
                              The Alger American Fund, the Depositor, and
                              Fred Alger and Company, Incorporated (Filed as
                              Exhibit 8(a) to Post-Effective Amendment No. 13
                              to the Registration Statement of the Registrant
                              on Form N-4, File No. 33-41628, filed April 26,
                              1999);

                 (b)(i)       Form of Participation Agreement dated February 17,
                              1998 by and between Goldman Sachs Variable,
                              Insurance Trust, Goldman Sachs & Co. and the
                              Depositor (Filed as Exhibit 8(b)(i) to
                              Post-Effective Amendment No. 13 to Registrant's
                              Registration Statement on Form N-4, File No.
                              33-41628, filed April 26, 1999);

                    (ii)      Form of Amendment No. 1 dated December 14, 1998 to
                              Participation Agreement filed as Exhibit 8(b)(i)
                              (Filed as Exhibit 8(b)(ii) to Post-Effective
                              Amendment No. 13 to Registrant's Registration
                              Statement on Form N-4, File No. 33-41628, filed
                              April 26, 1999);

                    (iii)     Form of Amendment No. 2 dated as of March 15, 1999
                              to Participation Agreement filed as
                              Exhibit 8(b)(i) (Filed as Exhibit 8(b)(iii) to
                              Post-Effective Amendment No. 13 to Registrant's
                              Registration Statement on Form N-4, File No.
                              33-41628, filed April 26, 1999);

                 (c)          Form of Fund Participation Agreement between
                              Depositor and J.P. Morgan Services Trust II
                              (Filed as Exhibit 8(c) to Post-Effective
                              Amendment No. 13 to Registrant's Registration
                              Statement on Form N-4, File No. 33-41628, filed
                              April 26, 1999);

                 (d)          Form of Participation Agreement dated February 17,
                              1998 by and among MFS/Sun Life Series Trust, the
                              Depositor and Massachusetts Financial Services
                              Company (Filed as Exhibit 8(d) to Post-Effective
                              Amendment No. 13 to Registrant's Registration
                              Statement on Form N-4, File No. 33-41628, filed
                              April 26, 1999);

                 (e)          Form of Participation Agreement dated February 17,
                              1998 by and among OCC Accumulation Trust, the
                              Depositor and OCC Distributors (Filed as Exhibit
                              8(e) to Post-Effective Amendment No. 13 to
                              Registrant's Registration Statement on Form N-4,
                              File No. 33-41628, filed April 26, 1999);

                 (f)          Form of Participation Agreement dated February,
                              1998 by and among the Depositor, Warburg Pincus
                              Trust, Warburg Pincus Asset Management, Inc. and
                              Counsellors Securities, Inc. (Filed as Exhibit
                              8(f) to Post-Effective Amendment No. 13 to
                              Registrant's Registration Statement on Form N-4,
                              File No. 33-41628, filed April 26, 1999);

                 (g)          Form of Participation Agreement dated February 17,
                              1998 by and among the Depositor, AIM Variable
                              Insurance Funds, Inc., AIM Distributors, Inc.,
                              and Clarendon Insurance Agency, Inc. (Filed as
                              Exhibit 8(g) to Post-Effective Amendment No. 1
                              to Registrant's Registration Statement in Form
                              N-4, File No. 333-82957, filed February 3, 2000);


                 (h)          Form of Participation Agreement dated August 18,
                              1999 by and among the Depositor, Sun Capital
                              Advisers Trust and Sun Capital Advisers, Inc.
                              (Filed as Exhibit 8(h) to Post-Effective
                              Amendment No. 1 to Registrant's Registration
                              Statement in Form N-4, File No. 333-82957, filed
                              February 3, 2000);

              (9)             Opinion of Counsel and Consent to its use as to
                              the legality of the securities being registered
                              (Filed as Exhibit 9 to the Registration
                              Statement of the Registrant on Form N-4, File
                              No. 333-82957, filed July 15, 1999);

             (10)(a)          Consent of Independent Auditors*;

                 (b)          Representation of Counsel pursuant to Rule
                              485(b)*;

             (11)             Financial Statement Schedules I and VI
                              (Incorporated by reference to the
                              Depositor's Form 10-K Annual Report for the
                              fiscal year ended December 31, 1999, filed on
                              March 21, 2000);

             (12)             Not Applicable;

             (13)             Schedule for Computation of Performance
                              Quotations (Incorporated by reference to
                              Exhibit 13 to Post-Effective Amendment No. 10
                              to the Registration Statement of the Registrant
                              on Form N-4, File No. 33-41628, filed on
                              April 29, 1998);



             (14)             Not Applicable;



             (15)(a)          Powers of Attorney (Filed as Exhibit 15 to the
                              Registration Statement on Form S-6,
                              File No. 333-94359, filed on January 10, 2000)

                 (b)          Power of Attorney of David D. Horn (Filed as
                              Exhibit 15(b) to Post-Effective Amendment No. 1 to
                              Registrant's Registration Statement on Form N-4,
                              File No. 333-82957, filed on February 3, 2000);



                 (c)          Power of Attorney of William W. Stinson (Filed
                              as Exhibit 15(d) to Post-Effective Amendment
                              No. 23 to the Registration Statement on Form
                              N-4, File No. 2-78738, filed on April 20, 2000);
                              and



             (16)             Organizational Chart of Sun Life
                              Assurance Company of Canada (Incorporated by
                              reference to Pre-Effective Amendment No. 1 to
                              the Registration Statement on Form N-4, File
                              No. 333-30844, filed on June 9, 2000).

* Filed herewith

<PAGE>

Item 25. DIRECTORS AND OFFICERS OF THE DEPOSITOR

          Name and                             Principal Positions and Offices
          Business Address                     with Depositor
          ----------------                     --------------

          Donald A. Stewart                    Chairman and Director
          150 King Street West
          Toronto, Ontario
          Canada M5H 1J9

          C. James Prieur                      Vice Chairman and Director
          150 King Street West
          Toronto, Ontario
          Canada MSH 1J9

          James A. McNulty, III                President and Director
          One Sun Life Executive Park
          Wellesley Hills, MA 02481




          Gregory W. Gee                       Director
          150 King Street West
          Toronto, Ontario
          Canada M5H 1J9

          David D. Horn                        Director
          Strong Road
          New Vineyard, ME 04956

          Angus A. MacNaughton                 Director
          Genstar Investment Corporation
          555 California Street, Suite 4850
          San Francisco, CA 94104

          S. Caesar Raboy                      Director
          220 Boylston Street
          Boston, MA 02110

          William W. Stinson                   Director
          Canadian Pacific Limited
          1800 Bankers Hall, East Tower
          855 - 2nd Street S.W.
          Calgary, Alberta
          Canada T2P 4Z5

<PAGE>

          Name and                           Principal Positions and Offices
          Business Address                   with Depositor
          ----------------                   --------------

          James M.A. Anderson                Vice President, Investments
          One Sun Life Executive Park
          Wellesley Hills, MA 02481

          Peter F. Demuth                    Vice President and Chief Counsel
          One Sun Life Executive Park        and Assistant Secretary
          Wellesley Hills, MA 02481

          Ronald J. Fernandes                Vice President, Retirement
          One Copley Place                   Products and Services
          Boston, MA 02116


          Ellen B. King                      Senior Counsel and Secretary
          One Sun Life Executive Park
          Wellesley Hills, MA 02481


          Davey S. Scoon                     Vice President, Finance and
          One Sun Life Executive Park        Treasurer
          Wellesley Hills, MA 02481

          Robert P. Vrolyk                   Vice President and
          One Sun Life Executive Park        Actuary
          Wellesley Hills, MA 02481

Item 26. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE DEPOSITOR OR
         REGISTRANT

     No person is directly or indirectly controlled by the Registrant. The
Registrant is a separate account of Sun Life Assurance Company of Canada
(U.S.), a wholly-owned subsidiary of Sun Life of Canada (U.S.) Holdings,
Inc., a wholly-owned subsidiary of Sun Life Assurance Company of Canada -
U.S. Operations Holdings, Inc., which is in turn a wholly-owned subsidiary of
Sun Life Assurance Company of Canada.

     The organizational chart of Sun Life Assurance of Canada is incorporated
herein by reference to Exhibit 16 to Pre-Effective Amendment No. 1 to the
Registration Statement on Form N-4, File No. 333-30844, filed on June 9, 2000.



<PAGE>

     None of the companies listed in such Exhibit 16 is a subsidiary of the
Registrant; therefore, the only financial statements being filed are those of
Sun Life Assurance Company of Canada (U.S.).

Item 27. NUMBER OF CONTRACT OWNERS:

     As of Spetember 1, 2000, there were 1,909 qualified and 3,151
non-qualified Contracts issued by the Depositor with respect to the securities
registered pursuant to this Registration Statement.

Item 28. INDEMNIFICATION

     Pursuant to Section 145 of the Delaware Corporation Law, Article 8 of
the By-laws of Sun Life Assurance Company of Canada (U.S.), as amended
effective January 1, 2000, a copy of which was filed as Exhibit 6(b) to
Pre-Effective Amendment No. 1 to the Registration Statement of the Registrant on
Form N-4, File No. 333-30844, provides for the indemnification of directors,
officers and employees of Sun Life Assurance Company of Canada (U.S.).

     Insofar as indemnification for liability arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons
of Sun Life Assurance Company of Canada (U.S.) pursuant to the certificate of
incorporation, by-laws, or otherwise, Sun Life (U.S.) 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 Sun Life (U.S.) of expenses incurred
or paid by a director, officer, controlling person of Sun Life (U.S.) 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, Sun Life (U.S.) will submit to a court of appropriate
jurisdiction the question whether such indemnification by them is against
public policy as expressed in the Act, unless in the opinion of their counsel
the matter has been settled by controlling precedent, and will be governed by
the final adjudication of such issue.

Item 29. PRINCIPAL UNDERWRITERS

     (a) Clarendon Insurance Agency, Inc., a wholly-owned subsidiary of the
Depositor, acts as general distributor for the Registrant, Sun Life of Canada
(U.S.) Variable Accounts C, D, E, G, H and I, Sun Life (N.Y.) Variable
Accounts A, B and C, and Money Market Variable Account, High Yield Variable
Account, Capital Appreciation Variable Account, Government Securities
Variable Account, World Governments Variable Account, Total Return Variable
Account, and Managed Sectors Variable Account.

<TABLE>
<CAPTION>
     Name and Principal                      Positions and Offices
     Business Address*                       with Underwriter
     ----------------                        ----------------
     <S>                                     <C>
     William Franca.....................     Managing Principal
     Michael M Senning..................     Managing Principal
     Davey S. Scoon.....................     Treasurer and Director
     James M.A. Anderson................     Director
     Ronald J. Fernandes................     Director
     James A. McNulty, III..............     Director
     George E. Maden....................     Secretary
     Brian A. Krivitsky.................     Vice President
     Cynthia M. Orcutt..................     Vice President
     Norton A. Goss, II.................     Assistant Vice President
</TABLE>

-------------
*    The principal business address of all directors and officers of the
principal underwriter except Messrs. Fernandes, Goss and Krivitsky is One
Sun Life Executive Park, Wellesley Hills, Massachusetts 02481. The principal
business address of Messrs. Fernandes, Goss and Krivitsky is One Copley
Place, Boston, Massachusetts 02116.

(a)  Inapplicable.

Item 30. LOCATION OF ACCOUNTS AND RECORDS

     Accounts, books and other documents required to be maintained by Section
31(a) of the Investment Company Act of 1940 and the Rules promulgated
thereunder are maintained, in whole or in part, by Sun Life Assurance Company
of Canada (U.S.) at its offices at One Sun Life Executive Park, Wellesley
Hills, Massachusetts 02481, and One Copley Place, Boston, Massachusetts 02116,
or at the offices of Clarendon Insurance Agency, Inc., at One Sun Life Executive
Park, Wellesley Hills, Massachusetts 02481.

Item 31. MANAGEMENT SERVICES

     Not Applicable.

Item 32. UNDERTAKINGS

     The Registrant hereby undertakes:

     (a) To file a post-effective amendment to this Registration Statement as
frequently as is necessary to ensure that the audited financial statements in
the Registration Statement are never more than 16 months old for so long as
payments under the variable annuity Contracts may be accepted;

     (b) To include either (1) as part of any application to purchase a Contract
offered by the prospectus, a space that an Applicant can check to request a
Statement of Additional Information, or (2) a post card or similar written
communication affixed to or included in the prospectus that the Applicant can
remove to send for a Statement of Additional Information;

     (c) To deliver any Statement of Additional Information and any financial
statements required to be made available under SEC Form N-4 promptly upon
written or oral request.

     (d) Representation with respect to Section 26(e)of the Investment Company
Act of 1940: Sun Life Assurance Company of Canada (U.S.) represents that the
fees and charges deducted under the Contracts, in the aggregate, are
reasonable in relation to the services rendered, the expenses expected to be
incurred, and the risks assumed by the insurance company.

     The Registrant is relying on the no-action letter issued by the Division
of Investment Management of the Securities and Exchange Commission to
American Council of Life Insurance, Ref. No. IP-6-88, dated November 28,
1988, the requirements for which have been complied with by the Registrant.


<PAGE>

                                   SIGNATURES

      As required by the Securities Act of 1933 and the Investment Company
Act of 1940, the Registrant certifies that it meets all of the requirements
of Securities Act Rule 485 for effectiveness of this Post-Effective Amendment
No. 4 to the Registration Statement and has caused this Post-Effective
Amendment to the Registration Statement to be signed on its behalf, in the
Town of Wellesley Hills, and Commonwealth of Massachusetts on this 31st day
of August, 2000.

<TABLE>
<S>                             <C>  <C>
                                SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT F
                                (Registrant)

                                SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
                                (Depositor)

                                By:  /s/  JAMES A. McNULTY, III
                                     ----------------------------
                                     James A. McNulty, III
                                     President
</TABLE>



Attest: /s/ SANDRA M. DADALT
--------------------------
     Sandra M. DaDalt
     Senior Counsel



      As required by the Securities Act of 1933, this Post-Effective
Amendment to the Registration Statement has been signed below by the
following persons in their capacities with the Depositor, Sun Life Assurance
Company of Canada (U.S.), and on the dates indicated.



<TABLE>
<CAPTION>
SIGNATURE                                TITLE                                           DATE
-------------------------------------    ------------------------------------            --------------
<S>                                      <C>                                             <C>

/s/ JAMES A. McNULTY, III                President and Director                          August 31, 2000
-------------------------------------    (Principal Executive Officer)
James A. McNulty, III


/s/ DAVEY S. SCOON                       Vice President, Finance                         August 31, 2000
-------------------------------------    and Treasurer
Davey S. Scoon                           (Principal Financial and Accounting Officer)

/s/ SANDRA M. DaDALT                     Attorney-in-Fact for:                           August 31, 2000
-------------------------------------      Donald A. Stewart, Chairman and Director*
Sandra M. DaDalt                           C. James Prieur, Vice Chairman and Director*
                                           Gregory W. Gee, Director*
                                           David D. Horn, Director**
                                           Angus A. McNaughton, Director*
                                           S. Caesar Raboy, Director*
                                           William W. Stinson, Director***
</TABLE>


*  Pursuant to Power of Attorney filed as Exhibit 8 to the Registration
Statement on Form S-6 (File No. 333-94359), filed January 10, 2000.




** Pursuant to Power of Attorney filed as Exhibit 15(b) to Post-Effective
Amendment No. 1 to Registrant's Registration Statement on Form N-4 (File
No. 333-82957), filed February 3, 2000.


*** Pursuant to Power of Attorney filed as Exhibit 15(d) to Post-Effective
Amendment No. 23 to the Registration Statement on Form N-4, File No. 2-78738,
filed April 20, 2000.


<PAGE>

                                   EXHIBIT INDEX

(10)(a)          Consent of Independent Auditors


(10)(b)          Representation of Counsel pursuant to Rule 485(b)




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