SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                           CALGON CARBON CORPORATION
                            -------------------------
                                (Name of Issuer)

                                  COMMON STOCK
                        --------------------------------
                         (Title of Class of Securities)
                                   129603109
                                ----------------
                                 (CUSIP Number)

                                   08/04/2006

            ---------------------------------------------------------
             (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)






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CUSIP No. 129603109                  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 Limited ("PAM")

                   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.
--------------------------------------------------------------------------------
       2        Check the Appropriate Box if a Member of a Group     (a) / /
                                                                     (b) / /
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       3        SEC Use Only
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       4        Citizenship or Place of Organization
                   Pictet Asset Management Limited - United Kingdom
--------------------------------------------------------------------------------
                        5     Sole Voting Power:
      Number of                  Pictet Asset Management Limited:
                              2,031,700
       Shares           --------------------------------------------------------
                        6     Shared Voting Power:
    Beneficially                 Pictet Asset Management Limited:
                              None
      Owned by          --------------------------------------------------------
                        7     Sole Dispositive Power:
        Each                     Pictet Asset Management Limited:
                              2,031,700
      Reporting         --------------------------------------------------------
                        8     Shared Dispositive Power:
     Person With                 Pictet Asset Management Limited:
                              None
--------------------------------------------------------------------------------
       9        Aggregate Amount Beneficially Owned by Each Reporting Person
                   Pictet Asset Management Limited:  2,031,700

--------------------------------------------------------------------------------
      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 Limited:  5.12%

--------------------------------------------------------------------------------
      12        Type of Reporting Person:
                   Pictet Asset Management Limited:  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 Limited ("PAM")

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

                        Pictet Asset Management Limited:
                                    Tower 42 Level 37
                                    25 Old Broad Street
                                    London  EC2N 1HQ
                                    UNITED KINGDOM


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

      (d)   Title of Class Securities: Common Stock

      (e)   CUSIP Number: 129603109

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.

      (a)   Amount Beneficially Owned:

                  Pictet Asset Management Limited: 2,031,700

      (b)   Percent of Class:

                  Pictet Asset Management Limited:  5.12%

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

       Pictet Asset Management Limited:
                  (i)      sole power to vote or to direct the vote: 2,031,700
                  (ii)     shared power to vote or to direct the vote: None



                  (iii)    sole power to dispose or to direct the disposition
                           of: 2,031,700
                  (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: 6th November 2006

                                             /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 Limited

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