DOMINI SOCIAL INVESTMENTS LLC 536 Broadway, 7th Floor New York, New York 10012

Exhibit h(3)

                          DOMINI SOCIAL INVESTMENTS LLC
                             000 Xxxxxxxx, 0xx Xxxxx
                            Xxx Xxxx, Xxx Xxxx 00000


                           Dated as of April 29, 2005

Domini Institutional Trust
c/o Domini Social Investments LLC
000 Xxxxxxxx, 0xx Xxxxx
Xxx Xxxx, Xxx Xxxx  00000

         Re:  Sponsorship Agreement

Ladies and Gentlemen:

         Reference is hereby made to that certain Sponsorship Agreement, dated
as of October 22, 1997 (such agreement, as amended and in effect from time to
time, the "Sponsorship Agreement"), by and between Domini Institutional Trust
(the "Trust") and Domini Social Investments LLC ("DSI" or the "Sponsor").

         The Trust and the Sponsor hereby agree that Section 3 of the
Sponsorship Agreement is hereby amended to read as follows:

                  3. Compensation of the Sponsor. For the services to be
         rendered and facilities provided by the Sponsor hereunder, the Trust
         shall pay DSI a fee accrued daily and payable monthly as specified on
         the Schedule A which is attached hereto and made a part of this
         Agreement. Such compensation shall be paid to DSI at the end of each
         month, and calculated by applying a daily rate, based on the annual
         percentage rates as specified on the attached Schedule A, to the
         assets. The fee calculation shall be based on the Trust's average daily
         net assets for the Trust's then-current fiscal year. If DSI serves as
         the Sponsor for less than the whole of any period specified in this
         Section 3, the compensation to DSI, as Sponsor, shall be prorated. For
         purposes of computing the fees payable to the Sponsor hereunder, the
         value of the Trust's net assets shall be computed in the manner
         specified in the Trust's then-current prospectus(es) and statement(s)
         of additional information.

         The Schedule A attached hereto is hereby added as Schedule A to the
Sponsorship Agreement.

         This letter agreement is a contract under seal and shall be governed by
and construed in accordance with the laws of the Commonwealth of Massachusetts.
This letter agreement may be executed in any number of counterparts, each of
which shall be an original and all of which, when taken together, shall
constitute one and the same instrument. In proving this letter agreement it




                                      -2-

shall not be necessary to produce or account for more than one such counterpart
signed by the party against whom enforcement is sought.

                                             Sincerely,

                                             DOMINI SOCIAL INVESTMENTS LLC


                                             By: /s/ Xxx X. Xxxxxx
                                                 -------------------------
                                                 Title: Manager

Accepted and Agreed:

DOMINI INSTITUTIONAL TRUST


By: /s/ Xxxxxx X. Xxxxxx
    ---------------------------------
    Title: Treasurer





                                                                      SCHEDULE A



Pursuant to Section 3, Domini Institutional Trust, on behalf of the Domini
Institutional Social Equity Fund and each other series of the Trust for which
this Agreement is approved, shall pay the Sponsor compensation at the following
annual rates:

              0.25% of the first $500 million of net assets managed
              0.24% of the next $500 million of net assets managed
               0.23% of net assets managed in excess of $1 billion