SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13G/A

                    Under the Securities Exchange Act of 1934

                            CALGON CARBON CORPORATION
                            -------------------------
                                (Name of Issuer)

                                  COMMON STOCK
                        --------------------------------
                         (Title of Class of Securities)

                                    129603106
                                ----------------
                                 (CUSIP Number)

                                   09/07/2007
            ---------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

      Check appropriate box to designate the rule pursuant to which this
Schedule is filed:

   | |      Rule 13d-1(b)

   |X|      Rule 13d-1(c)

   |_|      Rule 13d-1(d)







-----------------------                                    ---------------------
  CUSIP No. 129603106                 13G                    Page 1 of 1 Pages
-----------------------                                    ---------------------

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   1   Names of Reporting Persons/I.R.S. Identification Nos. of
       Above Persons (Entities Only)

          Pictet Asset Management SA("PAM SA")

          The reporting person disclaim beneficial ownership of the
       shares reported, which are owned of record and beneficially by
       three non-U.S. investment funds, both managed by PAM SA.
--------------------------------------------------------------------------------
   2   Check the Appropriate Box if a Member of a Group     (a) / /
                                                            (b) / /
--------------------------------------------------------------------------------
   3   SEC Use Only

--------------------------------------------------------------------------------
   4   Citizenship or Place of Organization
          Pictet Asset Management SA - Switzerland
--------------------------------------------------------------------------------
                       5     Sole Voting Power:
      Number of                 Pictet Asset Management SA:  3,881,800
                       ---------------------------------------------------------
       Shares          6     Shared Voting Power:
                                Pictet Asset Management SA:  None
    Beneficially       ---- ----------------------------------------------------
                       7     Sole Dispositive Power:
      Owned by                  Pictet Asset Management SA:  3,881,800
                       ---------------------------------------------------------
        Each           8     Shared Dispositive Power:
                                Pictet Asset Management SA:  None
      Reporting

     Person With

--------------------------------------------------------------------------------
   9   Aggregate Amount Beneficially Owned by Each Reporting Person
          Pictet Asset Management SA:  3,881,800
--------------------------------------------------------------------------------
  10   Check if the Aggregate Amount in Row (9) Excludes Certain
          Shares / /
--------------------------------------------------------------------------------
  11   Percent of Class Represented by Amount in Row (9)
          Pictet Asset Management SA:  9.62%
--------------------------------------------------------------------------------
  12   Type of Reporting Person:
          Pictet Asset Management SA:  IA
--------------------------------------------------------------------------------








Item 1.

      (a)   Name of Issuer: CALGON CARBON CORPORATION

      (b)   Address of Issuer's Principal Executive Offices:

                  PO BOX 717
                  PITTSBURG, PA 15230
                  UNITED STATES


Item 2

      (a)   Names of Person Filing:

            Pictet Asset Management SA("PAM SA")

      (b)   Address of Principal Business Office or, if none, Residence:

                       Pictet Asset Management SA:
                                      60 ROUTE DES ACACIAS
                                      GENEVA 73
                                      SWITZERLAND
                                      CH-12 11


      (c)   Citizenship:
                  Pictet Asset Management SA:  United Kingdom

      (d)   Title of Class Securities: COMMON STOCK

      (e)   CUSIP Number: 129603106


Item 3. If this statement is filed pursuant to Rule 13d-1 (b), or 13d-2 (b) or
(c), check whether the person is A

      Not applicable.

Item 4. Ownership

   The reporting persons disclaim beneficial ownership of the shares reported,
which are owned of record and beneficially by three non-U.S. investment funds,
both are managed by PAM SA.

      (a)   Amount Beneficially Owned:

                  Pictet Asset Management SA: 3,881,800

      (b)   Percent of Class:

                  Pictet Asset Management SA:  9.62%

      (c)   Number of shares as to which such person has:

            Pictet Asset Management SA:
                  (i)      sole power to vote or to direct the vote: 3,881,800



                  (ii)     shared power to vote or to direct the vote: None
                  (iii)    sole power to dispose or to direct the disposition
                           of: 3,881,800
                  (iv)     shared power to dispose or to direct the disposition
                           of: None

Item 5. Ownership of Five Percent or Less of a Class

      Not applicable.


Item 6. Ownership of More than Five Percent on Behalf of Another Person

      Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the
Security Being Reported on By the Parent Holding Company

      See answer to Item 2 (a)

Item 8. Identification and Classification of Members of the Group

      Not applicable.

Item 9. Notice of Dissolution of the Group

      Not applicable.

Item 10. Certification

      By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were not acquired and are not held for the
purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.





                                    SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

                                             Date: 11 July 2007

                                             /s/ David Cawthrow
                                             -----------------------------------
                                             David Cawthrow
                                             Chief Compliance Officer


                         AGREEMENT OF REPORTING PERSONS

         The undersigned herby agree that the foregoing Schedule 13G is filed
on behalf of the undersigned.


     Pictet Asset Management SA

     By: /s/ David Cawthrow
         -------------------------------
         David Cawthrow, Chief Compliance Officer