<PAGE>
                                                                   EXHIBIT 10.13



                         TRUST SHARE TRANSFER AGREEMENT

BETWEEN:

            RICHARD M. GLICKMAN, an individual resident in the Province of
            British Columbia

            (the "TRUSTEE")

AND:

            BRUCE G. COUSINS, an individual resident in the Province of British
            Columbia

            (the "TRANSFEREE")

WHEREAS:

A.    The Trustee is the trustee of the 2002 Aspreva Incentive Stock Purchase
      Plan Trust Agreement (the "TRUST AGREEMENT");

B.    The Trustee desires to transfer to the Transferee, and the Transferee
      desires to receive, 20,000 common shares (the "TRUST SHARES") in the
      capital of Aspreva Pharmaceuticals Corporation (the "COMPANY"); and

C.    The board of directors of the Company has approved the transfer of the
      Trust Shares from the Trustee to the Transferee.

NOW THEREFORE THIS AGREEMENT WITNESSES that in consideration of the premises,
the mutual covenants and agreements set forth in this Agreement and other good
and valuable consideration (the receipt and sufficiency of which is hereby
acknowledged by each of the parties), the parties hereby agree as follows:

1.    Transfer. The Trustee hereby agrees that, as soon as reasonably
      practicable following the execution of this Agreement, the Trustee will
      distribute to the Transferee under the Trust Agreement the Trust Shares
      and will cause to be delivered to the Transferee a share certificate (the
      "TRUST SHARE CERTIFICATE") registered in the Transferee's name
      representing the Trust Shares.

2.    Agreement to Be Bound. The Transferee agrees that, as a condition to being
      entitled to receive the Trust Shares and the Trust Share Certificate, the
      Transferee will execute and deliver to the Company, in a form satisfactory
      to the Company's solicitors, an agreement to be bound (the "AGREEMENT TO
      BE BOUND") to the amended and restated shareholders' agreement dated March
      5, 2004, as amended, between the Company and its shareholders.

3.    Return of Trust Shares. The Transferee agrees that, as an additional
      condition to being entitled to receive the Trust Shares and the Trust
      Share Certificate, the Transferee will, if the Transferee's executive
      employment agreement between the Transferee and the
<PAGE>
                                     - 2 -


      Company (the "EMPLOYMENT AGREEMENT") dated January 23, 2004 is terminated
      in accordance with its terms, immediately transfer to the Trustee, or as
      the Trustee may direct, for no consideration, all right, title and
      interest in and to the following Trust Shares, if any, and will cause a
      certificate representing such Trust Shares to be issued to the Trustee, or
      as the Trustee may direct, unless there has been a "CHANGE IN CONTROL" of
      the Company (as defined in the change of control agreement between the
      Company and the Transferee dated January 23, 2004 and attached to the
      Employment Agreement as Schedule B) during the term of the Employment
      Agreement:


      <Table>
      <Caption>

      TERMINATION DATE               NUMBER OF TRUST SHARES TO BE TRANSFERRED
      ----------------               ----------------------------------------
      <S>                                          <C>
      Before April 15, 2004                        19,444
      Before May 15, 2004                          18,888
      Before June 15, 2004                         18,332
      Before July 15, 2004                         17,776
      Before August 15, 2004                       17,220
      Before September 15, 2004                    16,664
      Before October 15, 2004                      16,108
      Before November 15, 2004                     15,552
      Before December 15, 2004                     14,996
      Before January 15, 2005                      14,440
      Before February 15, 2005                     13,884
      Before March 15, 2005                        13,328
      Before April 15, 2005                        12,772
      Before May 15, 2005                          12,216
      Before June 15, 2005                         11,660
      Before July 15, 2005                         11,104
      Before August 15, 2005                       10,548
      Before September 15, 2005                     9,992
      Before October 15, 2005                       9,436
      Before November 15, 2005                      8,880
      Before December 15, 2005                      8,324
      Before January 15, 2006                       7,768
      Before February 15, 2006                      7,212
      Before March 15, 2006                         6,656
      Before April 15, 2006                         6,100
      Before May 15, 2006                           5,544
      Before June 15, 2006                          4,988
      Before July 15, 2006                          4,432
      Before August 15, 2006                        3,876
      Before September 15, 2006                     3,320
      Before October 15, 2006                       2,764
      Before November 15, 2006                      2,208
      Before December 15, 2006                      1,652
      Before January 15, 2007                       1,096
      Before February 15, 2007                        540
      On or before March 15, 2007                     NIL

      </Table>


<PAGE>
                                     - 3 -

4.    Governing Law. This Agreement shall be governed by and interpreted in
      accordance with the laws of the Province of British Columbia and
      applicable laws of Canada and the parties hereto attorn to the exclusive
      jurisdiction of the provincial and federal courts of British Columbia.

5.    Entire Agreement. This Agreement constitutes the entire agreement between
      the parties with respect to the subject matter hereof, and may only be
      varied by further written agreement of the Trustee and the Transferee.
      This Agreement supersedes any previous communications, understandings and
      agreements between the Trustee and the Transferee.

6.    Further Assurances. The parties will execute and deliver to each other
      such further instruments and assurances and do such further acts as may be
      required to give effect to this Agreement.

7.    Headings. Marginal headings as used in this Agreement are for the
      convenience of reference only and do not form a part of this Agreement and
      are not to be used in the interpretation hereof.

8.    Wording. Whenever the singular or masculine or neuter is used throughout
      this Agreement the same shall be construed as meaning the plural or
      feminine or body corporate when the context or the parties hereto may
      require.

                 [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]
<PAGE>



9.    Notice. All notices and other communications that are required or
      permitted by this Agreement must be in writing and shall be hand delivered
      or sent by express delivery service or certified or registered mail,
      postage prepaid, to the parties at the addresses indicated below.

           IF TO THE TRUSTEE:

           Richard M. Glickman
           2377 Tyron Road
           Sidney, BC  V8L 5H8

           IF TO THE TRANSFEREE:

           Bruce G. Cousins
           4505 Emily Carr Drive
           Victoria, BC  V8X 2N5

      Any such notice shall be deemed to have been received on the earlier of
      the date actually received or the date five (5) days after the same was
      posted or sent. Either party may change its address by giving the other
      party written notice, delivered in accordance with this Article 9.

10.   Counterparts. This Agreement may be executed in any number of
      counterparts, each of which so executed shall be deemed to be an original,
      and such counterparts will together constitute but one Agreement.

      DATED effective December 8, 2004.


/s/ RICHARD M. GLICKMAN                    /s/ BRUCE G. COUSINS
-----------------------------------        -----------------------------------
RICHARD M. GLICKMAN, Trustee               BRUCE G. COUSINS
of the 2002 Aspreva Incentive Stock
Purchase Plan Trust Agreement