Exhibit 11(a)(1)


                          DOMINI SOCIAL INDEX PORTFOLIO
                         DOMINI SOCIAL INVESTMENT TRUST
                           DOMINI INSTITUTIONAL TRUST

                         CODE OF ETHICS FOR PURPOSES OF
                    SECTION 406 OF THE SARBANES-OXLEY ACT OF 2002

                            DATED AS OF JULY 31, 2003


I.      COVERED OFFICERS/PURPOSE OF THIS CODE

This code of ethics (this "Code") for purposes of Section 406 of the
Sarbanes-Oxley Act of 2002 has been adopted by each of the investment companies
listed above (collectively, the "Funds" and each, a "Fund") and applies to each
Fund's principal executive officer, principal financial officer, and principal
accounting officer (collectively, the "Covered Officers" and each, a "Covered
Officer"), each of whom is set forth on Exhibit A, for the purpose of promoting:

        o   honest and ethical conduct, including the ethical handling of actual
            or apparent conflicts of interest between personal and professional
            relationships;

        o   full, fair, accurate, timely, and understandable disclosure in
            reports and documents that a Fund files with, or submits to, the
            Securities and Exchange Commission (the "SEC"), and in other public
            communications made by a Fund;

        o   compliance with applicable laws and governmental rules and
            regulations;

        o   the prompt internal reporting of violations of this Code to an
            appropriate person or persons identified in this Code; and

        o   accountability for adherence to this Code.

Each Covered Officer should adhere to a high standard of business ethics and
should be sensitive to situations that may give rise to actual as well as
apparent conflicts of interest.

II.     COVERED OFFICERS SHOULD HANDLE ETHICALLY ACTUAL AND APPARENT CONFLICTS
        OF INTEREST

OVERVIEW. A "conflict of interest" occurs when a Covered Officer's private
interest interferes with the interests of, or his or her service to, a Fund. For
example, a conflict of interest would arise if a Covered Officer, or a member of
his or her family, receives improper personal benefits as a result of his or her
position with a Fund.

Certain conflicts of interest arise out of the relationships between Covered
Officers and a Fund and already are subject to conflict of interest provisions
in the Investment Company Act of 1940 (including the regulations thereunder, the
"Investment Company Act") and the Investment Advisers Act of 1940 (including the
regulations thereunder, the "Investment Advisers Act"). For example, Covered
Officers may not individually engage in certain transactions (such as the
purchase or sale of securities or other property)




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with a Fund because of their status as "affiliated persons" of such Fund. The
compliance programs and procedures of each Fund and of Domini Social Investments
LLC, its investment adviser and administrator ( "Domini"), are designed to
prevent, or identify and correct, violations of these provisions. This Code does
not, and is not intended to, repeat or replace these programs and procedures,
and such conflicts fall outside of the parameters of this Code. See also Section
V of this Code.

Although typically not presenting an opportunity for improper personal benefit,
conflicts arise from, or as a result of, the contractual relationship between a
Fund and Domini, of which the Covered Officers are also officers or employees.
As a result, this Code recognizes that the Covered Officers will, in the normal
course of their duties (whether for a Fund or for Domini, or for both), be
involved in establishing policies and implementing decisions that will have
different effects on Domini and a Fund. The participation of the Covered
Officers in such activities is inherent in the contractual relationship between
a Fund and Domini and is consistent with the performance by the Covered Officers
of their duties as officers of a Fund. Thus, if performed in conformity with the
provisions of the Investment Company Act and the Investment Advisers Act, such
activities will be deemed to have been handled ethically. In addition, it is
recognized by each Fund's Board of Trustees (the "Board") that the Covered
Officers may also be officers or employees of one or more other investment
companies covered by this or other codes and that service, by itself, does not
give rise to a conflict of interest.

Other conflicts of interest are covered by this Code, even if such conflicts of
interest are not subject to provisions in the Investment Company Act and the
Investment Advisers Act. The following list provides examples of conflicts of
interest under this Code, but Covered Officers should keep in mind that these
examples are not exhaustive. The overarching principle is that the personal
interest of a Covered Officer should not be placed improperly before the
interest of a Fund.

Each Covered Officer must not:

        o   use his or her personal influence or personal relationships
            improperly to influence investment decisions or financial reporting
            by a Fund whereby such Covered Officer would benefit personally to
            the detriment of such Fund;

        o   cause a Fund to take action, or fail to take action, for the
            individual personal benefit of such Covered Officer rather than the
            benefit of such Fund; or

        o   retaliate against any other Covered Officer or any employee of a
            Fund or its affiliated persons for reports of potential violations
            that are made in good faith.

There are some conflict of interest situations that should always be discussed
with and approved by Domini's General Counsel if material. Examples of these
include:(1)

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1 Please note that any activity or relationship that would present a conflict
for a Covered Officer would likely also present a conflict for such Covered
Officer if a member of such Covered Officer's family engages in such an activity
or has such a relationship. This should not be considered an exhaustive list of
every possible type of conflict of interest that might arise and should be
discussed with Domini's General Counsel. Additional conflicts of interest are
covered by Domini's Code of Ethics, and are not described here.





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        o   service as a director of a company (other than a Fund) that files or
            is required to file with the SEC periodic reports under Section 13
            or Section 15(d) of the Securities Exchange Act of 1934 (such as
            10-Ks, 10-Qs, and 8-Ks);

        o   the receipt of any gift or gratuity from any person or entity that
            does business with a Fund or has reasonably foreseeable prospective
            business dealings with a Fund, other than:

                (i)    any gifts or gratuities received in any 90-day period
                       from any one person or business entity, or several
                       related persons or business entities, having an aggregate
                       fair market value of not more than $150;

                (ii)   travel, lodging, entertainment, food, and beverages
                       provided in connection with a business or professional
                       meeting or function; and

                (iii)  goods and services, such as investment research reports
                       and newsletters, that are used in the conduct of the
                       business of Domini;

            o   any ownership interest in, or any consulting or employment
                relationship with, any of a Fund's service providers, other than
                Domini or any affiliated person thereof; and

            o   a direct or indirect financial interest in commissions,
                transaction charges, or spreads paid by a Fund for effecting
                portfolio transactions or for selling or redeeming shares other
                than an interest arising from a Covered Officer's employment,
                such as compensation or equity ownership.

III.        DISCLOSURE AND COMPLIANCE

            o   Each Covered Officer should familiarize himself or herself with
                the disclosure requirements generally applicable to the Funds.

            o   Each Covered Officer should not knowingly misrepresent, or cause
                others to misrepresent, facts about a Fund to others, whether
                within or outside such Fund, including to such Fund's Board and
                auditors, and to governmental regulators and self-regulatory
                organizations.

            o   Each Covered Officer should, to the extent appropriate within
                his or her area of responsibility, consult with other officers
                and employees of the Funds and of Domini and, as applicable, the
                Funds' other service providers, with the goal of promoting full,
                fair, accurate, timely, and understandable disclosure in the
                reports and documents the Funds file with, or submit to, the
                SEC, and in other public communications made by the Funds.

            o   It is the responsibility of each Covered Officer to promote
                compliance with the standards and restrictions imposed by
                applicable laws, rules, and regulations.




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IV.         REPORTING AND ACCOUNTABILITY

Each Covered Officer must:

            o   upon adoption of this Code (or thereafter as applicable, upon
                becoming a Covered Officer), affirm in writing to each Board
                that he or she has received, read, and understands this Code;

            o   annually thereafter affirm to each Board that he or she has
                complied with the requirements of this Code; and

            o   notify Domini's General Counsel promptly if he or she knows of
                any violation of this Code; failure to do so is itself a
                violation of this Code.

Domini's General Counsel is responsible for applying this Code to specific
situations in which questions are presented under it and has the authority to
interpret this Code in any particular situation. However, any approvals or
waivers sought by any Covered Officer will be considered by the Audit Committee
of a Fund.2

The Funds will follow these procedures in investigating and enforcing this Code:

            o   the General Counsel will take all appropriate action to
                investigate any potential violations reported to him/her;

            o   if, after such investigation, the General Counsel believes that
                no violation has occurred, the General Counsel is not required
                to take any further action;

            o   any matter that the General Counsel believes is a violation will
                be reported to the applicable Fund's Audit Committee in writing;

            o   if the Audit Committee concurs that a violation has occurred, it
                will inform and make a recommendation to the Board, which will
                consider appropriate action, which may include review of, and
                appropriate modifications to, applicable policies and
                procedures; notification to appropriate personnel of Domini; or
                a recommendation to dismiss such Covered Officer;

            o   the Audit Committee will be responsible for granting waivers, as
                it deems appropriate; and

            o   any changes to or waivers of this Code will, to the extent
                required, be disclosed as provided by SEC rules.

V.          OTHER POLICIES AND PROCEDURES

This Code shall be the sole code of ethics adopted by the Funds for purposes of
Section 406 of the Sarbanes-Oxley Act and the rules and forms applicable to
registered investment companies thereunder. Insofar as other policies or
procedures of the Funds, Domini, the principal underwriter, or other service
providers govern or purport to govern the behavior or activities of the Covered
Officers who are subject to this Code, they are

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2 Item 2 of Form N-CSR defines "waiver" as the "approval by the registrant of a
material departure from a provision of the code of ethics" and "implicit
waiver," which must also be disclosed, as "the registrant's failure to take
action within a reasonable period of time regarding a material departure from a
provision of the code of ethics that has been made known to an executive
officer" of the registrant.



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superseded by this Code to the extent that they overlap or conflict with the
provisions of this Code. The Funds' and Domini's and the principal underwriter's
codes of ethics under Rule 17j-1 under the Investment Company Act and Domini's
more detailed policies and procedures contained in Domini's Code of Ethics
binder are separate requirements applying to the Covered Officers and others,
and are not part of this Code.

VI.         AMENDMENTS

Any amendments to this Code, other than amendments to Exhibit A, must be
approved or ratified by a majority vote of each Board.

VII.        CONFIDENTIALITY

All reports and records prepared or maintained pursuant to this Code will be
considered confidential and shall be maintained and protected accordingly.
Except as otherwise required by law or this Code, such matters shall not be
disclosed to anyone other than the appropriate Board and its counsel and Domini.

VIII.       INTERNAL USE

This Code is intended solely for the internal use by the Funds and does not
constitute an admission, by or on behalf of any Fund or Domini, as to any fact,
circumstance, or legal conclusion.




                                                                       EXHIBIT A

                     Persons Covered by This Code of Ethics


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           FUND          PRINCIPAL            PRINCIPAL          PRINCIPAL
                         EXECUTIVE            FINANCIAL          ACCOUNTING
                          OFFICER              OFFICER            OFFICER
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DOMINI SOCIAL          Amy L. Domini,     Carole M. Laible,    Carole M. Laible,
INDEX PORTFOLIO        President          Treasurer            Treasurer
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DOMINI SOCIAL          Amy L. Domini,     Carole M. Laible,    Carole M. Laible,
INVESTMENT TRUST       President          Treasurer            Treasurer
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DOMINI                 Amy L. Domini,     Carole M. Laible,    Carole M. Laible,
INSTITUTIONAL TRUST    President          Treasurer            Treasurer
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