streetTRACKS(R) Series Trust One Lincoln Street Boston, MA 02111 SSgA Funds Management, Inc. One Lincoln Street Boston, MA 02111 Ladies and Gentlemen: Reference is made to the Amended and Restated Investment Advisory Agreement between us dated as of...

                                                                 Exhibit (d)(vi)

                          streetTRACKS(R) Series Trust
                               Xxx Xxxxxxx Xxxxxx
                                Xxxxxx, XX 00000

SSgA Funds Management, Inc.
Xxx Xxxxxxx Xxxxxx
Xxxxxx, XX 00000

Ladies and Gentlemen:

     Reference is made to the Amended and Restated Investment Advisory Agreement
between us dated as of September 1, 2003 (the "Agreement").

     Pursuant to the Agreement, this letter is to provide notice of the creation
of additional investment portfolios of streetTRACKS(R) Series Trust:

          the SPDR(R) Biotech ETF;
          the SPDR(R) Homebuilders ETF; and
          the SPDR(R) Semiconductors ETF (the "New Portfolios").

     In accordance with the Additional Portfolios provision of Section 1 of the
Agreement, we request that you act as Investment Adviser with respect to the New
Portfolios.

     Please indicate your acceptance of the foregoing by executing two copies of
this Agreement, returning one to the Trust and retaining one copy for your
records.

                                        Sincerely,

                                        streetTRACKS(R) Series Trust


                                        By: /s/ Xxxxx Xxxx
                                            ------------------------------------
                                            Xxxxx Xxxx, President


                                        Accepted:

                                        SSgA Funds Management, Inc.


                                        By: /s/ Xxxx Xxxxx
                                            ------------------------------------
                                            Xxxx Xxxxx

As of December 23, 2005